Exhibit 10.29

Executed December 9, 2015

OFFICE LEASE

611 GATEWAY BOULEVARD

BP GATEWAY CENTER LLC,
a Delaware limited liability company

as Landlord,

and

ATARA BIOTHERAPEUTICS, INC.,
a Delaware corporation ,

as Tenant.

EXHIBITS

AOUTLINE OF PREMISES

BTENANT WORK LETTER

CFORM OF NOTICE OF LEASE TERM DATES

DRULES AND REGULATIONS

EFORM OF TENANT'S ESTOPPEL CERTIFICATE

FSTANDARDS FOR UTILITIES AND SERVICES

GACCEPTABLE FORMS OF INSURANCE CERTIFICATE

HFORM OF LETTER OF CREDIT

611 GATEWAY BOULEVARD

OFFICE LEASE

This Office Lease (the "Lease"), dated as of the date set forth in Section 1 of the Summary of Basic Lease Information (the "Summary"), below, is made by and between BXP 611 GATEWAY CENTER LP, a Delaware limited partnership ("Landlord"), and ATARA BIOTHERAPEUTICS, INC., a Delaware corporation ("Tenant").

SUMMARY OF BASIC LEASE INFORMATION

ARTICLE 1

PREMISES, BUILDING, PROJECT, AND COMMON AREAS

1.1Premises, Building, Project and Common Areas.

1.1.1The Premises.  Landlord hereby leases to Tenant and Tenant hereby leases from Landlord the premises set forth in Section 2.2 of the Summary (the "Premises").  The outline of the Premises is set forth in Exhibit A attached hereto and each floor or floors of the Premises has the number of rentable square feet as set forth in Section 2.2 of the Summary.  The parties hereto agree that the lease of the Premises is upon and subject to the terms, covenants and conditions herein set forth, and Tenant covenants as a material part of the consideration for this Lease to keep and perform each and all of such terms, covenants and conditions by it to be kept and performed and that this Lease is made upon the condition of such performance.  The parties hereto hereby acknowledge that the purpose of Exhibit A is to show the approximate location of the Premises in the "Building," as that term is defined in Section 1.1.2, below, only, and such Exhibit is not meant to constitute an agreement, representation or warranty as to the construction of the Premises, the precise area thereof or the specific location of the "Common Areas," as that term is defined in Section 1.1.3, below, or the elements thereof or of the accessways to the Premises or the "Project," as that term is defined in Section 1.1.2, below.  Except as specifically set forth in this Lease and in the Tenant Work Letter attached hereto as Exhibit B (the "Tenant Work Letter"), Tenant shall accept the Premises in its presently existing "as-is" condition and Landlord shall not be obligated to provide or pay for any improvement work or services related to the improvement of the Premises.  Tenant also acknowledges that neither Landlord nor any agent of Landlord has made any representation or warranty regarding the condition of the Premises, the Building or the Project or with respect to the suitability of any of the foregoing for the conduct of Tenant's business, except as specifically set forth in this Lease and the Tenant Work Letter.  Except as set forth in the Tenant Work Letter, the taking of possession of the Premises by Tenant shall conclusively establish that the Premises and the Building were at such time in good and sanitary order, condition and repair.  For purposes of Section 1938 of the California Civil Code, Landlord hereby discloses to Tenant, and Tenant hereby acknowledges, that the Premises have not undergone inspection by a Certified Access Specialist (CASp).

1.1.2The Building and The Project.  The Premises are a part of the building set forth in Section 2.1 of the Summary (the "Building").  The Building is part of an office project known as "Gateway Center."  The term "Project," as used in this Lease, shall mean (i) the Building and the Common Areas, (ii) the land (which is improved with landscaping, subterranean parking facilities and other improvements) upon which the Building and the Common Areas are located, (iii) those certain other office buildings located in the vicinity of the Building and known as 601 Gateway Boulevard and 651 Gateway Boulevard, respectively, and the land upon which such office buildings are located, and (iv) at Landlord's discretion, any additional real property, areas, land, buildings or other improvements added thereto outside of the Project.

1.1.3Common Areas.  Tenant shall have the non-exclusive right to use in common with other tenants in the Project, and subject to the rules and regulations referred to in

Article 5 of this Lease, those portions of the Project which are provided, from time to time, for use in common by Landlord, Tenant and any other tenants of the Project (such areas, together with such other portions of the Project designated by Landlord, in its discretion, including certain areas designated for the exclusive use of certain tenants, or to be shared by Landlord and certain tenants, are collectively referred to herein as the "Common Areas").  The Common Areas shall consist of the "Project Common Areas" and the "Building Common Areas."  The term "Project Common Areas," as used in this Lease, shall mean the portion of the Project designated as such by Landlord, which Project Common Areas may include, from time to time, in Landlord's sole discretion, a conference center and other amenities.  The term "Building Common Areas," as used in this Lease, shall mean the portions of the Common Areas located within the Building designated as such by Landlord.  The manner in which the Common Areas are maintained and operated shall be at the reasonable discretion of Landlord (but shall at least be consistent with the manner in which the common areas of the "Comparable Buildings," as that term is defined below, are maintained and operated) and the use thereof shall be subject to such rules, regulations and restrictions as Landlord may make from time to time.  Landlord reserves the right to close temporarily, make alterations or additions to, or change the location of elements of the Project and the Common Areas.  As used in this Lease, the term "Comparable Buildings," shall be the Building and the other office buildings in the Project, and those other first class office buildings of comparable height, age, size, location, quality of construction and appearance, service and amenities, and with comparable covered or structure parking, which are located in office projects of comparable size as the project, and are located in the City of South San Francisco.   

1.2Rentable Square Feet of Premises and Building.  For purposes of this Lease, Landlord and Tenant hereby stipulate and agree that the "rentable square feet" in the Premises and the Building, as the case may be, is as set forth in Sections 2.1 and 2.2, respectively, of the Summary, and shall not be subject to remeasurement unless there is a physical changes in the size of the Premises or the Building.  

1.3Right of First Offer.  Landlord hereby grants to the originally named Tenant herein ("Original Tenant") a right of first offer with respect to the leasable space located on the ninth (9^th) floor of the Building which is not part of the initial Premises, as more specifically set forth on Exhibit A-1, attached hereto (the "First Offer Space").  Notwithstanding the foregoing, such first offer right of Tenant shall commence only following the expiration or earlier termination of the first lease or leases (including renewals and extensions, whether pursuant to express rights or otherwise) executed by Landlord with respect to the First Offer Space after the date of this Lease (the "Initial First Offer Space Lease(s)"), and such right of first offer shall be subordinate to all rights of tenants under leases of the First Offer Space existing as of the date hereof, and all rights of other tenants of the Project, which rights relate to the First Offer Space and which rights are set forth in leases of space in the Project existing as of the date hereof, each including any expansion, first offer, first negotiation and other similar rights, regardless of whether such rights are executed strictly in accordance with their respective terms or pursuant to lease amendments or new leases (all such tenants under Initial First Offer Space Lease(s) and other tenants of the Project, collectively, the "Superior Right Holders").  In addition, if Tenant, following its receipt of a "First Offer Notice," as that term is defined in Section 1.3.1 of this Lease, below, fails to exercise its right to lease all or any portion of the First Offer Space, then Landlord shall have a right to enter into an interim lease (an "Interim Lease") with a third party

with respect to such space (i.e., the space set forth in the First Offer Notice), and Tenant's right of first offer as set forth in this Section 1.3 shall be subordinate the all rights of the tenant under the Interim Lease and such tenant shall be deemed a Superior Right Holder.  Tenant's right of first offer shall be on the terms and conditions set forth in this Section 1.3. 

1.3.1Procedure for Offer.  Landlord shall notify Tenant (a "First Offer Notice") from time to time when the First Offer Space or any portion thereof becomes available for lease to third parties, provided that no Superior Right Holder wishes to lease such space.  Pursuant to such First Offer Notice, Landlord shall offer to lease to Tenant the then available First Offer Space.  A First Offer Notice shall describe the space so offered to Tenant and shall set forth the "First Offer Rent," as that term is defined in Section 1.3.3, below, and the other economic terms upon which Landlord is willing to lease such space to Tenant.  The rentable square footage of the space so offered to Tenant shall be as set forth in the First Offer Notice.  

1.3.2Procedure for Acceptance.  If Tenant wishes to exercise Tenant's right of first offer with respect to the space described in a First Offer Notice, then within five (5) business days of delivery of such First Offer Notice to Tenant, Tenant shall deliver notice to Landlord of Tenant's intention to exercise its right of first offer with respect to the entire space described in such First Offer Notice on the terms contained therein; provided, however, Tenant may irrevocably exercise Tenant's right of first offer with respect to the space described in the First Offer Notice pursuant to the terms of this Section 1.3.2, and, concurrently therewith, object to Landlord's determination of the First Offer Rent, as set forth in the First Offer Notice, in which case the First Offer Rent shall be determined pursuant to the terms of Section 1.3.3 of this Lease, below.  If Tenant does not so notify Landlord within the five (5) business day period, then Landlord shall be free to lease the space described in such First Offer Notice to anyone to whom Landlord desires on any terms Landlord desires.  Notwithstanding anything to the contrary contained herein, Tenant must elect to exercise its right of first offer, if at all, with respect to all of the space offered by Landlord to Tenant at any particular time, and Tenant may not elect to lease only a portion thereof.  If Tenant does not exercise its right of first offer with respect to any space described in a First Offer Notice or if Tenant fails to respond to a First Offer Notice within five (5) business days of delivery thereof, then Tenant's right of first offer as set forth in this Section 1.3 shall terminate as to all of the space described in such First Offer Notice until such time as Landlord has entered into an Interim Lease with respect to such space, at which time Tenant's right of first offer as set forth in this Section 1.3 shall be effective following the expiration or earlier termination of such Interim Lease.

1.3.3First Offer Space Rent.  The annual "Rent," as that term is defined in Section 4.1 of this Lease, payable by Tenant for the First Offer Space (the "First Offer Rent") shall be the "Fair Rental Value," as that term is defined below, for the First Offer Space, pursuant to transactions consummated within the nine (9)-month period preceding  the "First Offer Commencement Date," as that term is defined in Section 1.3.5 of this Lease.  The "Fair Rental Value," as used in this Lease, shall be equal to the annual rent per rentable square foot (including additional rent and considering any "base year" or "expense stop" applicable thereto), including all escalations, at which tenants (pursuant to leases consummated within the nine (9) month period preceding the First Offer Commencement Date), are leasing non-sublease, non-encumbered, non-equity space which is not significantly greater or smaller in size than the First Offer Space, for a comparable lease term, in an arm's length transaction, which comparable space

is located in the Comparable Buildings (transactions satisfying the foregoing criteria shall be known as the "Comparable Transactions"), taking into consideration the following concessions (the "Concessions"):  (a) rental abatement concessions, if any, being granted such tenants in connection with such comparable space; (b) tenant improvements or allowances provided or to be provided for such comparable space, and taking into account the value, if any, of the existing improvements in the First Offer Space, such value to be based upon the age, condition, design, quality of finishes and layout of the improvements and the extent to which the same can be utilized by a general office user other than Tenant; and (c) other reasonable monetary concessions being granted such tenants in connection with such comparable space; provided, however, that in calculating the Fair Rental Value, no consideration shall be given to (i) the fact that Landlord is or is not required to pay a real estate brokerage commission in connection with the First Offer Space, or the fact that landlords are or are not paying real estate brokerage commissions in connection with such comparable space, and (ii) any period of rental abatement, if any, granted to tenants in comparable transactions in connection with the design, permitting and construction of tenant improvements in such comparable spaces (provided that the foregoing shall in no way eliminate or alter Tenant’s right to the concession set forth in item (a), above, to the extent applicable).  The Fair Rental Value shall additionally include a determination as to whether, and if so to what extent, Tenant must provide Landlord with financial security, such as a letter of credit or guaranty, for Tenant's Rent obligations in connection with First Offer Space.  Such determination shall be made by reviewing the extent of financial security then generally being imposed in Comparable Transactions from tenants of comparable financial condition and credit history to the then existing financial condition and credit history of Tenant (with appropriate adjustments to account for differences in the then-existing financial condition of Tenant and such other tenants).  The Concessions (A) shall be reflected in the effective rental rate (which effective rental rate shall take into consideration the total dollar value of such Concessions as amortized on a straight-line basis over the applicable term of the Comparable Transaction (in which case such Concessions evidenced in the effective rental rate shall not be granted to Tenant)) payable by Tenant, or (B) at Landlord’s election, all such Concessions shall be granted to Tenant in kind.   

1.3.3.1Determination of First Offer Rent.  In the event Tenant timely and appropriately exercises its right of first offer, and rejects Landlord's First Offer Rent, then Landlord and Tenant shall attempt to agree upon the First Offer Rent using their good-faith efforts.  If Landlord and Tenant fail to reach agreement on or before the later of (i) that date that occurs thirty (30) days following Tenant's objection to the First Offer Rent, and (ii) the date that occurs ninety (90) day prior to the estimated date of delivery of the First Offer Space to Tenant (as applicable, the "Outside Agreement Date"), then each party shall make a separate determination of the First Offer Rent within five (5) days, and such determinations shall be submitted to arbitration in accordance with Sections 1.3.3.2 through 1.3.3.9, below.

1.3.3.2Landlord and Tenant shall each appoint one arbitrator who shall be, at the option of the appointing party, a real estate broker, appraiser or attorney who shall have been active over the ten (10) year period ending on the date of such appointment in the leasing or appraisal, as the case may be, of commercial high-rise properties in the vicinity of the Building.  The determination of the arbitrators shall be limited solely to the issue of whether Landlord's or Tenant's submitted First Offer Rent is the closest to the actual First Offer Rent, taking into account the requirements of this Section 1.3, as determined by the arbitrators.  Each such

arbitrator shall be appointed within fifteen (15) days after the Outside Agreement Date.  Landlord and Tenant may consult with their selected arbitrators prior to appointment and may select an arbitrator who is favorable to their respective positions.  The arbitrators so selected by Landlord and Tenant shall be deemed "Advocate Arbitrators." 

1.3.3.3The two (2) Advocate Arbitrators so appointed shall be specifically required pursuant to an engagement letter within ten (10) days of the date of the appointment of the last appointed Advocate Arbitrator to agree upon and appoint a third arbitrator ("Neutral Arbitrator") who shall be qualified under the same criteria set forth hereinabove for qualification of the two Advocate Arbitrators, except that neither the Landlord or Tenant or either parties' Advocate Arbitrator may, directly or indirectly, consult with the Neutral Arbitrator prior or subsequent to his or her appearance.  The Neutral Arbitrator shall be retained via an engagement letter jointly prepared by Landlord's counsel and Tenant’s counsel.

1.3.3.4The three arbitrators shall, within thirty (30) days of the appointment of the Neutral Arbitrator, reach a decision as to whether the parties shall use Landlord's or Tenant's submitted First Offer Rent, and shall notify Landlord and Tenant thereof.

1.3.3.5The decision of the majority of the three arbitrators shall be binding upon Landlord and Tenant.  

1.3.3.6If either Landlord or Tenant fails to appoint an Advocate Arbitrator within fifteen (15) days after the Outside Agreement Date, then either party may petition the presiding judge of the Superior Court of San Mateo County to appoint such Advocate Arbitrator subject to the criteria in this Section 1.3, or if he or she refuses to act, either party may petition any judge having jurisdiction over the parties to appoint such Advocate Arbitrator.

1.3.3.7If the two (2) Advocate Arbitrators fail to agree upon and appoint the Neutral Arbitrator, then either party may petition the presiding judge of the Superior Court of San Mateo County to appoint the Neutral Arbitrator, subject to criteria in Section 2.2.3.1 of this Lease, or if he or she refuses to act, either party may petition any judge having jurisdiction over the parties to appoint such arbitrator.

1.3.3.8The cost of the arbitration and the fees of the Neutral Arbitrator shall be paid by Landlord and Tenant equally.  Each party shall pay and bear the fees and expenses of its Advocate Arbitrator.

1.3.3.9In the event that the First Offer Rent shall not have been determined pursuant to the terms hereof prior to the First Offer Commencement Date, Tenant shall be required to pay the First Offer Rent initially provided by Landlord to Tenant, and upon the final determination of the First Offer Rent the payments made by Tenant shall be reconciled with the actual amounts of First Offer Rent due, and the appropriate party shall make any corresponding payment to the other party.

1.3.4Construction In First Offer Space.  Tenant shall accept the First Offer Space in its then existing "as is" condition.  The construction of improvements in the First Offer Space shall comply with the terms of Article 8 of this Lease.

1.3.5Amendment to Lease.  If Tenant timely exercises Tenant's right to lease First Offer Space as set forth herein, then, within fifteen (15) days thereafter, Landlord and Tenant shall execute an amendment to this Lease adding such First Offer Space to the Premises upon the terms and conditions as set forth in the First Offer Notice therefor and this Section 1.3.  Tenant shall commence payment of Rent for such First Offer Space, and the term of such First Offer Space shall commence, upon the date of delivery of such First Offer Space to Tenant (the "First Offer Commencement Date") and terminate on the date set forth in the First Offer Notice therefor. 

1.3.6Termination of Right of First Offer.  The rights contained in this Section 1.3 shall be personal to Original Tenant, and may only be exercised by Original Tenant (and not by any assignee, sublessee or other "Transferee," as that term is defined in Section 14.1 of this Lease, of Tenant's interest in this Lease) if Original Tenant occupies the entire Premises.  Tenant shall not have the right to lease First Offer Space, as provided in this Section 1.3, if, as of the date of the attempted exercise of any right of first offer by Tenant, or as of the scheduled date of delivery of such First Offer Space to Tenant, Tenant is in default under this Lease or Tenant has previously been in default under this Lease more than once.

ARTICLE 2

LEASE TERM

2.1Lease Term.  The terms and provisions of this Lease shall be effective as of the date of this Lease.  The term of this Lease (the "Lease Term") shall commence on the "Lease Commencement Date," as that term is set forth in Section 3.2 of the Summary, and shall terminate on the "Lease Expiration Date," as that term is set forth in Section 3.3 of the Summary, unless this Lease is sooner terminated as hereinafter provided.  If Landlord is unable for any reason to deliver possession of the Premises to Tenant on any specific date, then Landlord shall not be subject to any liability for its failure to do so, and such failure shall not affect the validity of this Lease or the obligations of Tenant hereunder; provided, however, if the existing tenant fails to surrender possession of the Premises to Landlord on or before the scheduled expiration or earlier termination of the existing tenant's lease, then Landlord shall use commercially reasonable efforts to obtain possession of the Premises as soon as reasonably practical thereafter.  For purposes of this Lease, the term "Lease Year" shall mean each consecutive twelve (12) month period during the Lease Term.  At any time during the Lease Term, Landlord may deliver to Tenant a notice in the form as set forth in Exhibit C, attached hereto, as a confirmation only of the information set forth therein, which Tenant shall execute and return to Landlord within five (5) days of receipt thereof; provided, however, Tenant's failure to execute and return such notice to Landlord within such time shall be conclusive upon Tenant that the information set forth in such notice is as specified therein.

2.2Occurrence of Delivery Date.  Landlord shall use its commercially reasonable, good faith efforts to cause the Delivery Date to occur on or before February 1, 2016.

2.2.1Outside Date of Delivery Date.  If Landlord does not cause the Delivery Date to occur by August 1, 2016 (the "Outside Date"), then the sole remedy of Tenant for such failure shall be the right to deliver a notice to Landlord (a "Termination Notice")

electing to terminate this Lease effective upon the date occurring five (5) business days following receipt by Landlord of the Termination Notice (the "Effective Date").  The Termination Notice must be delivered by Tenant to Landlord, if at all, not earlier than the Outside Date (as the same may be extended pursuant to the terms of Section 2.2.3, below) nor later than five (5) business days after the Outside Date.  The effectiveness of any such Termination Notice delivered by Tenant to Landlord shall be governed by the terms of this Section 2.2. 

2.2.2Extension of Outside Date After Delivery of the Termination Notice.  If Tenant delivers a Termination Notice to Landlord, then Landlord shall have the right to suspend the occurrence of the Effective Date for a period ending thirty (30) days after the Effective Date by delivering written notice to Tenant, prior to the Effective Date, that, in Landlord's reasonable, good faith judgment, the Delivery Date will occur within thirty (30) days after the Effective Date (the "Termination Extension Notice").  If the Delivery Date occurs within such thirty (30) day suspension period, then the Termination Notice shall be of no force or effect, but if the Delivery Date does not occur within such thirty (30) day suspension period, then this Lease shall terminate upon the expiration of such thirty (30) day suspension period.

2.2.3Extension of Outside Date Prior to the Delivery of Termination Notice.  If, prior to the Outside Date, Landlord determines that the Delivery Date will not occur by the Outside Date, then Landlord shall have the right to deliver a written notice to Tenant stating Landlord's opinion as to the date by which the Delivery Date will occur, and Tenant shall be required, within five (5) business days after receipt of such notice, to deliver a notice to Landlord pursuant to which Tenant shall elect either (i) to terminate this Lease, in which case this Lease shall terminate and be of no further force or effect upon Landlord's receipt of such notice, or (ii) to agree to extend the Outside Date to that date set forth in Landlord's notice to Tenant.  Failure by Tenant to deliver such notice or to make such election shall be deemed to be Tenant's agreement to extend the Outside Date to that date set forth in Landlord's notice to Tenant.  If Tenant agrees or is deemed to have agreed to extend the Outside Date, then Landlord shall have a continuing right to deliver a notice to Tenant which requests Tenant to elect either to terminate this Lease or to further extend the Outside Date as set forth in this Section 2.2.3, above, until the occurrence of the Delivery Date or until this Lease is terminated.  Upon the delivery of a Termination Notice by Tenant pursuant to Section 2.2.1 above in connection with an Outside Date extended pursuant to this Section 2.2.3, Landlord shall also have the same right to deliver the Termination Extension Notice as to the new Outside Date, as set forth in Section 2.2.2, above.

2.2.4Other Terms.  The Effective Date and the Outside Date shall be extended to the extent of any delays beyond the reasonable control of Landlord, including any delay or delays caused by "Force Majeure," as that term is defined in Section 29.16 of this Lease.  Upon any termination as set forth in this Section 2.2, Landlord and Tenant shall be relieved from any and all liability to each other resulting hereunder except that Landlord shall return to Tenant the Security Deposit and any prepaid rent.  Tenant's rights to terminate this Lease, as set forth in this Section 2.2, shall be Tenant's sole and exclusive remedy at law or in equity for the failure of the Delivery Date to occur as set forth above.

ARTICLE 3

BASE RENT

3.1Base Rent.  Commencing on the Lease Commencement Date, Tenant shall pay, without prior notice or demand, base rent ("Base Rent") as set forth in Section 4 of the Summary, payable in equal monthly installments as set forth in Section 4 of the Summary in advance on or before the first day of each and every calendar month during the Lease Term, without any setoff or deduction whatsoever.  The Base Rent for the first full month of the Lease Term (following the "Rent Abatement Period," as that term is defined in Section 3.2, below) shall be paid at the time of Tenant's execution of this Lease.  If any Rent payment date (including the Lease Commencement Date) falls on a day of the month other than the first day of such month or if any payment of Rent is for a period which is shorter than one month, the Rent for any fractional month shall accrue on a daily basis for the period from the date such payment is due to the end of such calendar month or to the end of the Lease Term at a rate per day which is equal to 1/365 of the applicable annual Rent.  All other payments or adjustments required to be made under the terms of this Lease that require proration on a time basis shall be prorated on the same basis.  Until notice of some other designation is given to Tenant in accordance with the provisions of Article 28 of this Lease, Base Rent and all other charges shall be paid by remittance to or for the order of BXP 611 Gateway Center LP by one of the following methods:  

(i)By ACH Transfer & Direct Deposit.

Bank of America
345 Montgomery Street, Concourse Level #1499
San Francisco, California 94101
ABA# 121-000-358
Account: Boston Properties L.P. Operating Account
Account Number: 14993-06215
Amount:  [fill in appropriate dollar amount]
Reference:  [fill in Tenant Name and Tenant Number]

or

(ii) By Mail.

Gateway Center LLC

C/O Boston Properties, LP

Property 5

P. O. Box 742841

Los Angeles, CA 90074-2841

or

(iii)By Overnight Delivery.  

Bank of America Lock Box Services
Lockbox LAC-742841

2706 Media Center Drive
Los Angeles, California  90065.

3.2Abated Base Rent.  Provided that Tenant is not then in default of this Lease, then during the first full calendar month of the Lease Term (the "Rent Abatement Period"), Tenant shall not be obligated to pay any Base Rent otherwise attributable to the Premises during such Rent Abatement Period (the "Rent Abatement").  Landlord and Tenant acknowledge that the aggregate amount of the Rent Abatement equals $45,794.50.  Tenant acknowledges and agrees that the foregoing Rent Abatement has been granted to Tenant as additional consideration for entering into this Lease, and for agreeing to pay the rental and performing the terms and conditions otherwise required under this Lease.  If Tenant shall be in default under this Lease, and shall fail to cure such default within the notice and cure period, if any, permitted for cure pursuant to terms and conditions of the Lease, or if this Lease is terminated for any reason other than Landlord’s breach of this Lease, then the dollar amount of the unapplied portion of the Rent Abatement as of the date of such default or termination, as the case may be, shall be converted to a credit to be applied to the Base Rent applicable at the end of the Lease Term and Tenant shall immediately be obligated to begin paying Base Rent for the Premises in full.

ARTICLE 4

ADDITIONAL RENT

4.1General Terms.  In addition to paying the Base Rent specified in Article 3 of this Lease, Tenant shall pay (i) "Tenant's Share" of the annual "Building Direct Expenses," as those terms are defined in Sections 4.2.10 and 4.2.2 of this Lease, respectively, which are in excess of the amount of Building Direct Expenses applicable to the "Base Year," as that term is defined in Section 4.2.1 of this Lease, and (ii) Tenant's Share of "Capital Expenses," as that term is defined in Section 4.2.9, below, pursuant to Section 4.6 of this Lease; provided, however, that in no event shall any decrease in Building Direct Expenses for any "Expense Year," as that term is defined in Section 4.2.6 of this Lease, below Building Direct Expenses for the Base Year entitle Tenant to any decrease in Base Rent or any credit against sums due under this Lease.  Such payments by Tenant, together with any and all other amounts payable by Tenant to Landlord pursuant to the terms of this Lease, are hereinafter collectively referred to as the "Additional Rent," and the Base Rent and the Additional Rent are herein collectively referred to as "Rent."  All amounts due under this Article 4 as Additional Rent shall be payable for the same periods and in the same manner as the Base Rent.  Without limitation on other obligations of Tenant which survive the expiration of the Lease Term, the obligations of Tenant to pay the Additional Rent provided for in this Article 4 shall survive the expiration of the Lease Term.  Landlord may upon expiration of the Lease Term deliver to Tenant an estimate of any Base Rent, Additional Rent or other obligations outstanding, and Landlord may either deduct such amount from any funds otherwise payable to Tenant upon expiration or require Tenant to pay such funds immediately.  Landlord shall make necessary adjustments for differences between actual and estimated Additional Rent in accordance with Section 4.4, below.

4.2Definitions of Key Terms Relating to Additional Rent.  As used in this Article 4, the following terms shall have the meanings hereinafter set forth:

4.2.1"Base Year" shall mean the period set forth in Section 5 of the Summary. 

4.2.2"Building Direct Expenses" shall mean "Building Operating Expenses" and "Building Tax Expenses", as those terms are defined in Sections 4.2.3 and 4.2.4, below, respectively.

4.2.3"Building Operating Expenses" shall mean the portion of "Operating Expenses," as that term is defined in Section 4.2.7 below, allocated to the tenants of the Building pursuant to the terms of Section 4.3.1 below.

4.2.4"Building Tax Expenses" shall mean that portion of "Tax Expenses", as that term is defined in Section 4.2.8 below, allocated to the tenants of the Building pursuant to the terms of Section 4.3.1 below.

4.2.5"Direct Expenses" shall mean "Operating Expenses" and "Tax Expenses."

4.2.6"Expense Year" shall mean each calendar year in which any portion of the Lease Term falls, through and including the calendar year in which the Lease Term expires, provided that Landlord, upon notice to Tenant, may change the Expense Year from time to time to any other twelve (12) consecutive month period, and, in the event of any such change, Tenant's Share of Building Direct Expenses and Capital Expenses shall be equitably adjusted for any Expense Year involved in any such change.

4.2.7"Operating Expenses" shall mean all expenses, costs and amounts of every kind and nature which Landlord pays or accrues during any Expense Year because of or in connection with the ownership, management, maintenance, security, repair, replacement, restoration or operation of the Project, or any portion thereof.  Without limiting the generality of the foregoing, Operating Expenses shall specifically include any and all of the following:  (i) the cost of supplying all utilities, the cost of operating, maintaining, repairing, replacing, renovating and managing the utility systems, mechanical systems, sanitary, storm drainage systems, communication systems and escalator and elevator systems, and the cost of supplies, tools, and equipment and maintenance and service contracts in connection therewith; (ii) the cost of licenses, certificates, permits and inspections and the cost of contesting any governmental enactments which may affect Operating Expenses, and the costs incurred in connection with a transportation system management program or similar program; (iii) the cost of all insurance carried by Landlord in connection with the Project as reasonably determined by Landlord (including, without limitation, commercial general liability insurance, physical damage insurance covering damage or other loss caused by fire, earthquake, flood and other water damage, explosion, vandalism and malicious mischief, theft or other casualty, rental interruption insurance and such insurance as may be required by any lessor under any present or future ground or underlying lease of the Building or Project or any holder of a mortgage, trust deed or other encumbrance now or hereafter in force against the Building or Project or any portion thereof); (iv) the cost of landscaping, decorative lighting, and relamping, the cost of maintaining fountains, sculptures, bridges and all supplies, tools, equipment and materials used in the operation, repair and maintenance of the Project, or any portion thereof; (v) the cost of parking area repair, restoration, and maintenance, including, without limitation, resurfacing, repainting, restriping and cleaning; (vi) fees, charges and other costs, including management fees (or

amounts in lieu thereof, but subject to exclusion (y), below), consulting fees (including, without limitation, any consulting fees incurred in connection with the procurement of insurance), legal fees and accounting fees, of all contractors, engineers, consultants and all other persons engaged by Landlord or otherwise incurred by or charged by Landlord in connection with the management, operation, administration, maintenance and repair of the Building and the Project; (vii) payments under any equipment rental agreements or management agreements (including the cost of any actual or charged management fee and the actual or charged rental of any management office space); (viii) wages, salaries and other compensation and benefits, including taxes levied thereon, of all persons engaged in the operation, maintenance and security of the Project; (ix) costs under any instrument pertaining to the sharing of costs by the Project; (x) operation, repair, maintenance and replacement of all systems and equipment and components thereof of the Project; (xi) the cost of janitorial, alarm, security and other services, replacement of wall and floor coverings, ceiling tiles and fixtures in common areas, maintenance and replacement of curbs and walkways, repair to roofs and re-roofing; (xii) amortization (including interest on the unamortized cost at an annual interest rate determined by Landlord) of the cost of acquiring or the rental expense of personal property used in the maintenance, operation and repair of the Project, or any portion thereof; (xiii) costs, fees, charges or assessments imposed by, or resulting from any mandate imposed on Landlord by, any federal, state or local government for fire and police protection, trash removal, community services, or other services which do not constitute "Tax Expenses" as that term is defined in Section 4.2.8, below; (xiv) advertising, marketing and promotional expenditures incurred in connection with the Project, including, without limitation, costs of signs in, on or about the Project identifying or promoting the Project; (xv) payments under any easement, license, operating agreement, declaration, restrictive covenant, or instrument pertaining to the sharing of costs by the Project or related to the use or operation of the Project; and (xvi) all costs of applying and reporting for the Project or any part thereof to seek or maintain certification under the U.S. EPA’s Energy Star® rating system, the U.S. Green Building Council’s Leadership in Energy and Environmental Design (LEED) rating system or a similar system or standard.  Notwithstanding anything to the contrary in this Lease, the following items shall be excluded from Operating Expenses: 

(a)any items included in Tax Expenses;

(b)except as permitted pursuant to items (xii) and (xiii), above, principal or interest on indebtedness, debt amortization or ground rent paid by Landlord in connection with any mortgages, deeds of trust or other financing encumbrances, or ground leases of the Building or the Project;

(c)capital improvements to the Building or the Project (provided this exclusion (c) shall not be deemed to limit Capital Expenses), and rental payments and other related expenses incurred in leasing air conditioning systems, elevators or other equipment ordinarily considered to be of a capital nature, except (i) equipment which is used in providing janitorial or similar services and which is not affixed to the Building, and (ii) equipment rented to remedy or ameliorate an emergency condition;

(d)legal, auditing, consulting and professional fees and other costs paid or incurred in connection with financings, refinancings or sales of any interest in Landlord or of Landlord’s interest in the Building or the Project or in connection with any ground lease

(including, without limitation, recording costs, mortgage recording taxes, title insurance premiums and other similar costs, but excluding those legal, auditing, consulting and professional fees and other costs incurred in connection with the normal and routine maintenance and operation of the Building and/or the Project); 

(e)legal fees, space planner’s fees, architect’s fees, leasing and brokerage commissions, advertising and promotional expenditures and any other marketing expense incurred in connection with the leasing of space in the Building (including new leases, lease amendments, lease terminations and lease renewals);

(f)the cost of any items to the extent to which such cost is reimbursed to Landlord by tenants of the Project (other than as a reimbursement of operating expenses), or other third parties, or is covered by a warranty to the extent of reimbursement for such coverage;

(g)expenditures for any leasehold improvement which is made in connection with the preparation of any portion of the Building for occupancy by any tenant of the Building or the Project;

(h)the cost of performing work or furnishing service to or for any tenant other than Tenant, at Landlord’s expense, to the extent such work or service is in excess of any work or service Landlord is obligated to provide to Tenant or generally to other tenants in the Building at Landlord’s expense;

(i)the cost of repairs or replacements incurred by reason of fire or other casualty, or condemnation, to the extent Landlord actually receives proceeds of property and casualty insurance policies or condemnation awards or would have received such proceeds had Landlord maintained the insurance required to be maintained by Landlord under this Lease;

(j)the cost of acquiring sculptures, paintings or other objects of fine art in the Building or the Project in excess of amounts typically spent for such items in Class A office buildings of comparable quality in the San Francisco financial district area;

(k)bad debt loss, rent loss, or reserves for bad debt or rent loss;

(l) unfunded contributions to operating expense reserves by other tenants;

(m)contributions to charitable or political organizations in excess of the greater of (1) the amounts typically spent for such contributions in Class A office buildings of comparable quality in the South San Francisco area, and (2) $50,000.00 in the aggregate in any single Expense Year;

(n)expenses related solely and exclusively to the operation of the retail space in the Project;

(o)damage and repairs necessitated by the gross negligence or willful misconduct of Landlord Parties;

(p)fees, costs and expenses incurred by Landlord in connection with or relating to claims against or disputes with tenants of the Building or the Project; 

(q)interest, fines or penalties for late payment or violations of Applicable Laws by Landlord, except to the extent incurring such expense is either (1) a reasonable business expense under the circumstances, or (2) caused by a corresponding late payment or violation of an Applicable Law by Tenant, in which event Tenant shall be responsible for the full amount of such expense;

(r)the cost of remediation and removal of “Hazardous Substance,” as that term is defined in Section 5.2, below, in the Building or on the Project as required by applicable laws, provided, however, that the provisions of this sub-item (r) shall not preclude the inclusion of costs with respect to materials (whether existing at the Project as of the date of this Lease or subsequently introduced to the Project) which are not, as of the date of this Lease (or as of the date of introduction), deemed to be Hazardous Substance under applicable laws but which are subsequently deemed to be Hazardous Substance under applicable laws (it being understood and agreed that Tenant shall nonetheless be responsible under Section 5.2 of this Lease for all costs of remediation and removal of Hazardous Substance to the extent caused by Tenant Parties);

(s)costs for the original construction and development of the Building and nonrecurring costs for the repair or replacement of any structural portion of the Building made necessary as a result of defects in the original design, workmanship or materials;

(t)costs and expenses incurred for the administration of the entity which constitutes Landlord, as the same are distinguished from the costs of operation, management, maintenance and repair of the Building and/or the Project, including, without limitation, entity accounting and legal matters;

(u)the wages and benefits of any employee who does not devote substantially all of his or her employed time to the Project unless such wages and benefits are prorated on a reasonable basis to reflect time spent on the operation and management of the Project vis-à-vis time spent on matters unrelated to the operation and management of the Project;

(v)except as may be otherwise expressly provided in this Lease with respect to specific items, including, without limitation, any management fee paid by Landlord, the cost of any services or materials provided by any party related to Landlord, to the extent such cost exceeds, the reasonable cost for such services or materials absent such relationship in Class A office buildings of comparable quality in the San Francisco financial district area;

(w)depreciation for the Building, except as permitted pursuant to items (xii) and (xiii), above;

(x)reserves for future improvements, repairs, additions, etc.; and

(y)fees payable by Landlord for management of the Project in excess of the greater of (i) the management fee generally charged at the Comparable Buildings, and (ii) three and one-half percent (3½%) (the “Management Fee Cap”) of Landlord’s gross rental revenues, adjusted and grossed up to reflect a one hundred percent (100%) occupancy of the Project with

all tenants paying full rent, as contrasted with free rent, half-rent and the like, including base rent, pass-throughs, and parking fees (but excluding the cost of after hours services or utilities), from the Project for any calendar year or portion thereof. 

If Landlord is not furnishing any particular work or service (the cost of which, if performed by Landlord, would be included in Operating Expenses and the cost incurred by Landlord for such work or service would vary with the occupancy of the Building) to a tenant who has undertaken to perform such work or service in lieu of the performance thereof by Landlord, then in order to allow Landlord to collect from Tenant and all other tenants in the Building an amount equal to what Landlord actually incurs for such work or service with respect to the other tenants (including Tenant) of the Building, Operating Expenses shall be deemed to be increased by an amount equal to the additional Operating Expenses which would reasonably have been incurred during such period by Landlord if it had at its own expense furnished such work or service to such tenant.  If the Project is not at least one hundred percent (100%) occupied during all or a portion of the Base Year or any Expense Year, Landlord may elect to make an appropriate adjustment to the components of Operating Expenses for such year to determine the amount of Operating Expenses that would have been incurred had the Project been one hundred percent (100%) occupied; and the amount so determined shall be deemed to have been the amount of Operating Expenses for such year.  Operating Expenses for the Base Year shall not include market-wide cost increases (including utility rate increases) due to extraordinary circumstances, including, but not limited to, Force Majeure, boycotts, strikes, conservation surcharges, security concerns, embargoes or shortages.  In no event shall the components of Direct Expenses for any Expense Year related to Tax Expenses, Project utility, services, or insurance costs be less than the components of Direct Expenses related to Tax Expenses, Project utility, services, or insurance costs in the Base Year.

4.2.8Taxes.

4.2.8.1"Tax Expenses" shall mean all federal, state, county, or local governmental or municipal taxes, fees, charges or other impositions of every kind and nature, whether general, special, ordinary or extraordinary (including, without limitation, real estate taxes, general and special assessments, transit taxes, business taxes, leasehold taxes or taxes based upon the receipt of rent, including gross receipts or sales taxes applicable to the receipt of rent, unless required to be paid by Tenant, personal property taxes imposed upon the fixtures, machinery, equipment, apparatus, systems and equipment, appurtenances, furniture and other personal property used in connection with the Project, or any portion thereof), which shall be paid or accrued during any Expense Year (without regard to any different fiscal year used by such governmental or municipal authority) because of or in connection with the ownership, leasing and operation of the Project, or any portion thereof.

4.2.8.2Tax Expenses shall include, without limitation:  (i) Any tax on the rent, right to rent or other income from the Project, or any portion thereof, or as against the business of leasing the Project, or any portion thereof (other than any income taxes owed by Landlord); (ii) Any assessment, tax, fee, levy or charge in addition to, or in substitution, partially or totally, of any assessment, tax, fee, levy or charge previously included within the definition of real property tax, it being acknowledged by Tenant and Landlord that Proposition 13 was adopted by the voters of the State of California in the June 1978 election ("Proposition 13") and

that assessments, taxes, fees, levies and charges may be imposed by governmental agencies for such services as fire protection, street, sidewalk and road maintenance, refuse removal and for other governmental services formerly provided without charge to property owners or occupants, and, in further recognition of the decrease in the level and quality of governmental services and amenities as a result of Proposition 13, Tax Expenses shall also include any governmental or private assessments or the Project's contribution towards a governmental or private cost-sharing agreement for the purpose of augmenting or improving the quality of services and amenities normally provided by governmental agencies; (iii) Any assessment, tax, fee, levy, or charge allocable to or measured by the area of the Premises, the tenant improvements in the Premises, or the Rent payable hereunder, including, without limitation, any business or gross income tax or excise tax with respect to the receipt of such rent, or upon or with respect to the possession, leasing, operating, management, maintenance, alteration, repair, use or occupancy by Tenant of the Premises, or any portion thereof; (iv) Any assessment, tax, fee, levy or charge, upon this transaction or any document to which Tenant is a party, creating or transferring an interest or an estate in the Premises; and (v) All of the real estate taxes and assessments imposed upon or with respect to the Building and all of the real estate taxes and assessments imposed on the land and improvements comprising the Project. 

4.2.8.3If Tax Expenses for any period during the Lease Term or any extension thereof are increased after payment thereof for any reason, including, without limitation, error or reassessment by applicable governmental or municipal authorities, Tenant shall pay Landlord upon demand Tenant's Share of any such increased Tax Expenses included by Landlord as Building Tax Expenses pursuant to the terms of this Lease.  Notwithstanding anything to the contrary contained in this Section 4.2.8 (except as set forth in Section 4.2.8.1, above), there shall be excluded from Tax Expenses (i) all excess profits taxes, franchise taxes, gift taxes, capital stock taxes, inheritance and succession taxes, estate taxes, federal and state income taxes, and other taxes to the extent applicable to Landlord's general or net income (as opposed to rents, receipts or income attributable to operations at the Project), (ii) any items included as Operating Expenses, and (iii) any items paid by Tenant under Section 4.5 of this Lease.

4.2.8.4Notwithstanding anything to the contrary set forth in this Lease, the amount of Tax Expenses for the Base Year and any Expense Year shall be calculated without taking into account any decreases in real estate taxes obtained in connection with Proposition 8, and, therefore, the Tax Expenses in the Base Year and/or an Expense Year may be greater than those actually incurred by Landlord, but shall, nonetheless, be the Tax Expenses due under this Lease; provided that (i) any costs and expenses incurred by Landlord in securing any Proposition 8 reduction shall not be deducted from Tax Expenses nor included in Direct Expenses for purposes of this Lease, and (ii) tax refunds under Proposition 8 shall not be deducted from Tax Expenses nor refunded to Tenant, but rather shall be the sole property of Landlord.  Landlord and Tenant acknowledge that the preceding sentence is not intended to in any way affect (A) the inclusion in Tax Expenses of the statutory two percent (2.0%) annual increase in Tax Expenses (as such statutory increase may be modified by subsequent legislation), or (B) the inclusion or exclusion of Tax Expenses pursuant to the terms of Proposition 13.  Notwithstanding anything to the contrary set forth in this Lease, only Landlord may institute proceedings to reduce Tax Expenses and the filing of any such proceeding by Tenant without Landlord's consent shall constitute an event of default by Tenant under this Lease.  Notwithstanding the foregoing,

Landlord shall not be obligated to file any application or institute any proceeding seeking a reduction in Tax Expenses.  Notwithstanding the foregoing, upon a reassessment of the Building and/or the Project pursuant to the terms of Proposition 13 (a "Reassessment") occurring after the Base Year which results in a decrease in Tax Expenses, the component of Tax Expenses for the Base Year which is attributable to the assessed value of the Building and/or the Project under Proposition 13 prior to the Reassessment (without taking into account any Proposition 8 reductions) (the "Base Year Prop 13 Taxes") shall be reduced, if at all, for the purposes of comparison to all subsequent Expense Years (commencing with the Expense Year in which the Reassessment takes place) to an amount equal to the real estate taxes based upon such Reassessment, and if thereafter, in connection with a subsequent Reassessment, the assessed value of the Building and/or the Project under Proposition 13 shall increase, the current Base Year Prop 13 Taxes shall be increased for purposes of comparison to all subsequent Expense Years (commencing with the Expense Year in which the Reassessment takes place) to an amount equal to the lesser of the original Base Year Prop 13 Taxes and an amount equal to the real estate taxes based upon such Reassessment. 

4.2.9"Capital Expenses" shall mean all cost of capital repair, improvements or expenditures incurred by Landlord in connection with the Project (A) which are intended to effect economies in the operation, cleaning or maintenance of the Project, or any portion thereof, (B) that are required to comply with present or anticipated conservation programs, (C) which are replacements or modifications of nonstructural items located in the Common Areas required to keep the Common Areas in good order or condition, or (D) that are required under any governmental law or regulation.  In no event shall Capital Expenses include any costs incurred by Landlord prior to or during the Base Year.

4.2.10"Tenant's Share" shall mean the percentage set forth in Section 6 of the Summary.  Tenant's Share was calculated by multiplying the number of rentable square feet of the Premises, as set forth in Section 2.2 of the Summary, by 100, and dividing the product by the total number of rentable square feet in the office area of the Building.  

4.3Allocation of Direct Expenses.

4.3.1Method of Allocation.  The parties acknowledge that the Building is a part of a multi-building project and that the costs and expenses incurred in connection with the Project (i.e., the Direct Expenses) should be shared between the tenants of the Building and the tenants of the other buildings in the Project.  Accordingly, as set forth in Section 4.2 above, Direct Expenses (which consists of Operating Expenses and Tax Expenses) are determined annually for the Project as a whole, and a portion of the Direct Expenses, which portion shall be determined by Landlord on an equitable basis, shall be allocated to the tenants of the Building (as opposed to the tenants of any other buildings in the Project) and such portion shall be the Building Direct Expenses for purposes of this Lease.  Such portion of Direct Expenses allocated to the tenants of the Building shall include all Direct Expenses attributable solely to the Building and an equitable portion of the Direct Expenses attributable to the Project as a whole.

4.3.2Cost Pools.  Landlord shall have the right, from time to time, to equitably allocate some or all of the Direct Expenses for the Project among different portions or occupants of the Project (the "Cost Pools"), in Landlord's discretion.  Such Cost Pools may include, but

shall not be limited to, the office space tenants of a building of the Project or of the Project, and the retail space tenants of a building of the Project or of the Project.  The Direct Expenses allocable to each such Cost Pool shall be allocated to such Cost Pool and charged to the tenants within such Cost Pool in an equitable manner. 

4.4Calculation and Payment of Direct Expenses.  If for any Expense Year ending or commencing within the Lease Term, Tenant's Share of Building Direct Expenses for such Expense Year exceeds Tenant's Share of Building Direct Expenses applicable to the Base Year, then Tenant shall pay to Landlord, in the manner set forth in Section 4.4.1, below, and as Additional Rent, an amount equal to the excess (the "Excess").

4.4.1Statement of Actual Building Direct Expenses and Payment by Tenant.  Landlord shall endeavor to give to Tenant following the end of each Expense Year, a statement (the "Statement") which shall state the Building Direct Expenses incurred or accrued for such preceding Expense Year, and which shall indicate the amount of the Excess.  Upon receipt of the Statement for each Expense Year commencing or ending during the Lease Term, if an Excess is present, Tenant shall pay, with its next installment of Base Rent due or within thirty (30) days, whichever is earlier, the full amount of the Excess for such Expense Year, less the amounts, if any, paid during such Expense Year as "Estimated Excess," as that term is defined in Section 4.4.2, below.  If the amounts paid by Tenant during an Expense Year as Estimated Excess exceed the Excess for such Expense Year, then such difference shall be reimbursed by Landlord to Tenant, provided that any such reimbursement, at Landlord's option, may be credited against the Additional Rent next coming due under this Lease unless the Lease Term has expired, in which event Landlord shall refund the appropriate amount to Tenant.  The failure of Landlord to timely furnish the Statement for any Expense Year shall not prejudice Landlord or Tenant from enforcing its rights under this Article 4.  Even though the Lease Term has expired and Tenant has vacated the Premises, when the final determination is made of Tenant's Share of Building Direct Expenses for the Expense Year in which this Lease terminates, if an Excess is present, Tenant shall immediately pay to Landlord such amount.  The provisions of this Section 4.4.1 shall survive the expiration or earlier termination of the Lease Term.

4.4.2Statement of Estimated Building Direct Expenses.  In addition, Landlord shall endeavor to give Tenant a yearly expense estimate statement (the "Estimate Statement") which shall set forth Landlord's reasonable estimate (the "Estimate") of what the total amount of Building Direct Expenses for the then-current Expense Year shall be and the estimated excess (the "Estimated Excess") as calculated by comparing the Building Direct Expenses for such Expense Year, which shall be based upon the Estimate, to the amount of Building Direct Expenses for the Base Year.  The failure of Landlord to timely furnish the Estimate Statement for any Expense Year shall not preclude Landlord from enforcing its rights to collect any Estimated Excess under this Article 4, nor shall Landlord be prohibited from revising any Estimate Statement or Estimated Excess theretofore delivered to the extent necessary.  Thereafter, Tenant shall pay, with its next installment of Base Rent due, a fraction of the Estimated Excess for the then-current Expense Year (reduced by any amounts paid pursuant to the last sentence of this Section 4.4.2).  Such fraction shall have as its numerator the number of months which have elapsed in such current Expense Year, including the month of such payment, and twelve (12) as its denominator.  Until a new Estimate Statement is furnished (which Landlord shall have the right to deliver to Tenant at any time), Tenant shall pay monthly, with

the monthly Base Rent installments, an amount equal to one-twelfth (1/12) of the total Estimated Excess set forth in the previous Estimate Statement delivered by Landlord to Tenant. 

4.5Taxes and Other Charges for Which Tenant Is Directly Responsible.

4.5.1Tenant shall be liable for and shall pay thirty (30) days before delinquency, taxes levied against Tenant's equipment, furniture, fixtures and any other personal property located in or about the Premises.  If any such taxes on Tenant's equipment, furniture, fixtures and any other personal property are levied against Landlord or Landlord's property or if the assessed value of Landlord's property is increased by the inclusion therein of a value placed upon such equipment, furniture, fixtures or any other personal property and if Landlord pays the taxes based upon such increased assessment, which Landlord shall have the right to do regardless of the validity thereof but only under proper protest if requested by Tenant, Tenant shall upon demand repay to Landlord the taxes so levied against Landlord or the proportion of such taxes resulting from such increase in the assessment, as the case may be.

4.5.2If the tenant improvements in the Premises, whether installed and/or paid for by Landlord or Tenant and whether or not affixed to the real property so as to become a part thereof, are assessed for real property tax purposes at a valuation higher than the valuation at which tenant improvements conforming to Landlord's "building standard" in other space in the Building are assessed, then the Tax Expenses levied against Landlord or the property by reason of such excess assessed valuation shall be deemed to be taxes levied against personal property of Tenant and shall be governed by the provisions of Section 4.5.1, above.

4.5.3Notwithstanding any contrary provision herein, Tenant shall pay prior to delinquency any (i) rent tax or sales tax, service tax, transfer tax or value added tax, business tax or any other applicable tax on the rent or services herein or otherwise respecting this Lease, (ii) taxes assessed upon or with respect to the possession, leasing, operation, management, maintenance, alteration, repair, use or occupancy by Tenant of the Premises or any portion of the Project, including the Project parking facility; or (iii) taxes assessed upon this transaction or any document to which Tenant is a party creating or transferring an interest or an estate in the Premises.

4.6Calculation and Payment of Capital Expenses.  Notwithstanding any provision to the contrary contained in this Lease, Tenant shall pay to Landlord, on a monthly basis. as Additional Rent and in addition to Tenant's Share of Building Direct Expenses, an amount equal to Tenant's Share of all Capital Expenses incurred by Landlord for any Expense Year following the Base Year; provided, however, any such Capital Expenses shall be amortized (including interest on the unamortized cost at an annual interest rate determined by Landlord) over its useful life as Landlord shall reasonably determine in accordance with sound real estate management and accounting principles and consistent with Landlord's past practices, and Tenant shall only be obligated to pay Tenant's Share of such amortized amount; provided further, however, if Landlord reasonably concludes on the basis of engineering estimates that a particular capital expenditure will effect savings in Operating Expenses, including, without limitation, energy related costs, and that such projected savings will, on an annual basis (“Projected Annual Savings”), exceed the annual amortization therefor, then and in such event the amount of amortization for such capital expenditure shall be increased to an amount equal to the Projected

Annual Savings; and in such circumstance, the increased amortization (in the amount of the Projected Annual Savings) shall be made for such period of time as it would take to fully amortize the cost of the item in question, together with interest thereon at the interest rate as aforesaid in equal monthly payments, each in the amount of 1/12th of the Projected Annual Savings, with such payment to be applied first to interest and the balance to principal.  The amount of Capital Expenses incurred by Landlord, as well as Tenant's Share of such Capital Expenses, shall be set forth on each Statement and each Estimate Statement delivered by Landlord Tenant and Tenant shall pay Tenant's Share of such Capital Expenses at the same time and in the same manner as Tenant shall pay Tenant's Share of Building Direct Expenses. 

4.7Landlord's Books and Records.  Notwithstanding anything to the contrary contained in this Lease, if, within ninety (90) days after receipt of a Statement by Tenant, Tenant (i) reasonably disputes any amounts set forth in any Statement described above in this Article 4, and (ii) is not then in default under this Lease, then Tenant shall have the right to cause Landlord’s general ledger of accounts with respect to such disputed Statement only to be audited by a nationally recognized firm of certified public accountants reasonably approved by Landlord, at no cost or expense to Landlord, which has prior experience in the review of financial statements and which shall not have provided primary accounting services to Tenant or any other tenant in the Project within the immediately preceding five (5) year period and which shall not be retained by Tenant on a contingency fee basis; provided, however, Tenant shall not have the right to perform any such audit more than one (1) time for any Expense Year during the Lease Term.  Any audit conducted by or on behalf of Tenant shall be completed in a diligent manner and timely manner and shall be performed at Landlord’s office during Landlord’s normal business hours and in a manner so as to minimize interference with Landlord’s business operations.  Landlord shall have no obligation and Tenant shall have no right to make photocopies of any of Landlord’s ledgers, invoices or other items.  Tenant agrees to keep, and to cause Tenant's accountant and its employees to keep, all information revealed by any audit of Landlord’s books and records strictly confidential and not to disclose any such information or permit any such information to be disclosed to anyone other than Landlord, unless compelled to do so by a court of law, and Tenant and its accountant shall sign a confidentiality agreement reflecting such confidentiality.  Tenant’s audit shall be limited to an on-site review of Landlord’s general ledger of accounts and supporting documentation.  If after such audit, Landlord and Tenant dispute the results of such audit, at Tenant's request, a certified public accounting firm selected by Landlord, and approved by Tenant, shall, at Tenant's cost, conduct an audit of the relevant Direct Expenses.  The amounts payable under this Section 4.7 by Landlord to Tenant or by Tenant to Landlord, as the case may be, will be appropriately adjusted on the basis of such audit.  If such audit discloses an overstatement of Direct Expenses in excess of five percent (5%) for such Expense Year, Landlord shall reimburse Tenant for the reasonable cost of both audits (not to exceed $20,000.00); otherwise the cost of such audits shall be borne by Tenant.  Tenant agrees that this Section 4.6 shall be the sole method to be used by Tenant to dispute the amount of any Direct Expenses payable by Tenant pursuant to the terms of this Lease, and Tenant hereby waives any other rights at law or in equity relating thereto.

ARTICLE 5

USE OF PREMISES

5.1Permitted Use.  Tenant shall use the Premises solely for the Permitted Use set forth in Section 7 of the Summary and Tenant shall not use or permit the Premises or the Project to be used for any other purpose or purposes whatsoever without the prior written consent of Landlord, which may be withheld in Landlord's sole discretion.

5.2Prohibited Uses.  Tenant further covenants and agrees that Tenant shall not use, or suffer or permit any person or persons to use, the Premises or any part thereof for any use or purpose contrary to the provisions of the Rules and Regulations set forth in Exhibit D, attached hereto, or in violation of the laws of the United States of America, the State of California, or the ordinances, regulations or requirements of the local municipal or county governing body or other lawful authorities having jurisdiction over the Project, including, without limitation, any such laws, ordinances, regulations or requirements relating to hazardous materials or substances, as those terms are defined by applicable laws now or hereafter in effect.  In the event of a conflict of the express terms and conditions of this Lease and the terms and conditions of any Rules and Regulations, the terms and conditions of this Lease shall prevail.  Tenant shall not do or permit anything to be done in or about the Premises which will in any way damage the reputation of the Project or obstruct or interfere with the rights of other tenants or occupants of the Building, or injure or annoy them or use or allow the Premises to be used for any improper, unlawful or objectionable purpose, nor shall Tenant cause, maintain or permit any nuisance in, on or about the Premises.  Tenant shall comply with, and Tenant's rights and obligations under the Lease and Tenant's use of the Premises shall be subject and subordinate to, all recorded easements, covenants, conditions, and restrictions now or hereafter affecting the Project.  Tenant shall not cause or permit any "Hazardous Substance," as that term is defined below, to be kept, maintained, used, stored, produced, generated or disposed of (into the sewage or waste disposal system or otherwise) on or in the Premises by Tenant or Tenant's agents, employees, contractors, invitees, assignees or sublessees, without first obtaining Landlord's written consent.  Tenant shall immediately notify, and shall direct Tenant's agents, employees contractors, invitees, assignees and sublessees to immediately notify, Landlord of any incident in, on or about the Premises, the Building or the Project that would require the filing of a notice under any federal, state, local or quasi-governmental law (whether under common law, statute or otherwise), ordinance, decree, code, ruling, award, rule, regulation or guidance document now or hereafter enacted or promulgated, as amended from time to time, in any way relating to or regulating any Hazardous Substance.  As used herein, "Hazardous Substance" means any substance which is toxic, ignitable, reactive, or corrosive and which is regulated by any local government, the State of California, or the United States government.  "Hazardous Substance" includes any and all material or substances which are defined as "hazardous waste," "extremely hazardous waste" or a "hazardous substance" pursuant to state, federal or local governmental law.  "Hazardous Substance" also includes asbestos, polychlorobiphenyls (i.e., PCB's) and petroleum.

ARTICLE 6

SERVICES AND UTILITIES

6.1Standard Tenant Services.  Landlord shall provide the services specified below and on Exhibit F attached hereto, on all days (unless otherwise stated below or in Exhibit F) during the Lease Term. 

6.1.1Subject to limitations imposed by all governmental rules, regulations and guidelines applicable thereto, Landlord shall provide heating, ventilation and air conditioning ("HVAC") when necessary for normal comfort for normal office use in the Premises from 7:00 A.M. to 6:00 P.M. Monday through Friday (collectively, the "Building Hours"), except for the date of observation of New Year's Day, Independence Day, Labor Day, Memorial Day, Thanksgiving Day, Christmas Day and, at Landlord's discretion, other locally or nationally recognized holidays (collectively, the "Holidays").  Landlord shall provide HVAC to the Premises outside of Building Hours at Tenant’s request as set forth in Exhibit F.  Tenant shall cooperate fully with Landlord at all times and abide by all reasonable regulations and requirements that Landlord may reasonably prescribe for the proper functioning and protection of the HVAC, electrical, mechanical and plumbing systems.

6.1.2Landlord shall provide electricity to the Premises (including adequate electrical wiring and facilities for connection to Tenant's lighting fixtures and incidental use equipment) for lighting and power suitable for the Permitted Use as reasonably determined by Landlord, provided that Tenant's electrical usage shall be subject to applicable laws and regulations.  Tenant shall bear the cost of replacement of lamps, starters and ballasts for non-Building standard lighting fixtures within the Premises.

6.1.3Landlord shall provide city water from the regular Building outlets for drinking, lavatory and toilet purposes in the Building Common Areas.

6.1.4Landlord shall provide nonexclusive, non-attended automatic passenger elevator service during the Building Hours, shall have one elevator available at all other times, including on the Holidays, except in the event of emergency, and shall provide nonexclusive, non-attended automatic passenger escalator service during Building Hours only.

6.1.5Landlord shall provide nonexclusive freight elevator service subject to scheduling by Landlord.

6.1.6Landlord shall provide customary weekday janitorial services to the Premises, except the date of observation of the Holidays, in and about the Premises and customary occasional window washing services, each in a manner consistent with other Class "A" office buildings located in the vicinity of the Project.

6.1.7Subject to applicable laws and the other provisions of this Lease, and except in the event of an emergency, Tenant shall have access to the Building, the Premises and the common areas of the Building, other than common areas requiring access with a Building engineer, twenty-four (24) hours per day, seven (7) days per week, every day of the year; provided, however, that Tenant shall only be permitted to have access to and use of the parking garage, freight elevator, loading dock, mailroom and other limited-access areas of the Building during the normal operating hours of such portions of the Building.

Notwithstanding anything in this Lease to the contrary, if Landlord or any affiliate of Landlord has elected to qualify as a real estate investment trust (“REIT”), any service required or permitted to be performed by Landlord pursuant to this Lease, the charge or cost of which may be treated as impermissible tenant service income under the laws governing a REIT, may be performed by a taxable REIT subsidiary that is affiliated with either Landlord or Landlord’s property manager, an independent contractor of Landlord or Landlord’s property manager (the “Service Provider”).  If Tenant is subject to a charge under this Lease for any such service, then, at Landlord’s direction, Tenant will pay such charge either to Landlord for further payment to the Service Provider or directly to the Service Provider, and, in either case, (i) Landlord will credit such payment against Additional Rent due from Tenant under this Lease for such service, and (ii) such payment to the Service Provider will not relieve Landlord from any obligation under the Lease concerning the provisions of such service.

6.2Overstandard Tenant Use.  Tenant shall not, without Landlord's prior written consent, use heat-generating machines, machines other than normal fractional horsepower office machines, or equipment or lighting other than Building standard lights in the Premises, which may affect the temperature otherwise maintained by the air conditioning system or increase the water normally furnished for the Premises by Landlord pursuant to the terms of Section 6.1 of this Lease.  If Tenant uses water, electricity, heat or air conditioning in excess of that supplied by Landlord pursuant to Section 6.1 of this Lease (as reasonably determined by Landlord employing industry standard methodology), Tenant shall pay to Landlord, upon billing, the cost of such excess consumption, the cost of the installation, operation, and maintenance of equipment which is installed in order to supply such excess consumption, and the cost of the increased wear and tear on existing equipment caused by such excess consumption; and Landlord may install devices to separately meter (or sub-meter) any increased use and in such event Tenant shall pay the increased cost directly to Landlord, on demand, at the rates charged by the public utility company furnishing the same, including the cost of such additional metering (or sub-metering) devices.  In addition, in the event that there is located in the Premises a data center containing high density computing equipment, as defined in the U.S. EPA’s Energy Star® rating system (“Energy Star”), Landlord may require the installation in accordance with Energy Star of separate metering or check metering equipment, in which event (i) Tenant shall pay the costs of any such meter or check meter directly to Landlord, on demand, including the installation and connectivity thereof, (ii) Tenant shall directly pay to the utility provider all electric consumption on any meter, and (iii) Tenant shall pay to Landlord, as Additional Rent, all electric consumption on any check meter within thirty (30) days after being billed thereof by Landlord, in addition to other electric charges payable by Tenant under the Lease.  In the event that Tenant purchases any utility service directly from the provider, Tenant shall promptly provide to Landlord either permission to access Tenant’s usage information from the utility service provider or copies of the utility bills for Tenant’s usage of such services in a format reasonably acceptable to Landlord.  Tenant's use of electricity shall never exceed the capacity of the feeders to the Project or the risers or wiring installation, and subject to the terms of Section 29.32, below, Tenant shall not install or use or permit the installation or use of any computer or electronic data processing equipment in the Premises, without the prior written consent of Landlord.  If Tenant desires to use heat, ventilation or air conditioning during hours other than those for which Landlord is obligated to supply such utilities pursuant to the terms of Section 6.1 of this Lease, Tenant shall give Landlord such prior notice, if any, as Landlord shall from time to time establish as appropriate, of Tenant's desired use in order to supply such utilities, and Landlord shall supply

such utilities to Tenant at such hourly cost to Tenant (which shall be treated as Additional Rent) as Landlord shall from time to time establish.  Landlord shall have the exclusive right, but not the obligation, to provide any additional services which may be required by Tenant, including, without limitation, locksmithing, lamp replacement, additional janitorial service, and additional repairs and maintenance.  If Tenant requests any such additional services, then Tenant shall pay to Landlord the cost of such additional services, including Landlord's standard fee for its involvement with such additional services, promptly upon being billed for same. 

6.3Interruption of Use.  Tenant agrees that Landlord shall not be liable for damages, by abatement of Rent or otherwise, for failure to furnish or delay in furnishing any service (including telephone and telecommunication services), or for any diminution in the quality or quantity thereof, when such failure or delay or diminution is occasioned, in whole or in part, by breakage, repairs, replacements, or improvements, by any strike, lockout or other labor trouble, by inability to secure electricity, gas, water, or other fuel at the Building or Project after reasonable effort to do so, by any riot or other dangerous condition, emergency, accident or casualty whatsoever, by act or default of Tenant or other parties, or by any other cause beyond Landlord's reasonable control (provided that the foregoing shall not limit Landlord's liability, if any, pursuant to Applicable Law for personal injury and property damage to the extent caused by the gross negligence or willful misconduct of Landlord, its agents, employees or contractors); and such failures or delays or diminution shall never be deemed to constitute an eviction or disturbance of Tenant's use and possession of the Premises or relieve Tenant from paying Rent or performing any of its obligations under this Lease.  Furthermore, Landlord shall not be liable under any circumstances for a loss of, or injury to, property or for injury to, or interference with, Tenant's business, including, without limitation, loss of profits, however occurring, through or in connection with or incidental to a failure to furnish any of the services or utilities as set forth in this Article 6.

ARTICLE 7

REPAIRS

Tenant shall, at Tenant's own expense, keep the Premises, including all improvements, fixtures and furnishings therein, and the floor or floors of the Building on which the Premises are located, in good order, repair and condition at all times during the Lease Term.  In addition, Tenant shall, at Tenant's own expense, but under the supervision and subject to the prior approval of Landlord, and within any reasonable period of time specified by Landlord, promptly and adequately repair all damage to the Premises and replace or repair all damaged, broken, or worn fixtures and appurtenances, except for damage caused by ordinary wear and tear or beyond the reasonable control of Tenant; provided however, that, Landlord shall have the exclusive right, at Landlord's option, but not the obligation, to make such repairs and replacements, and Tenant shall pay to Landlord the actual and reasonable cost thereof, including Landlord's standard fee generally applicable to the Building for its involvement with such repairs and replacements, promptly upon being billed for same.  Landlord may, but shall not be required to, enter the Premises pursuant to Article 27 of this Lease, below, to make such repairs, alterations, improvements or additions to the Premises or to the Project or to any equipment located in the Project as Landlord shall desire or deem necessary or as Landlord may be required to do by governmental or quasi-governmental authority or court order or decree.  Tenant hereby waives

any and all rights under and benefits of subsection 1 of Section 1932 and Sections 1941 and 1942 of the California Civil Code or under any similar law, statute, or ordinance now or hereafter in effect.

ARTICLE 8

ADDITIONS AND ALTERATIONS

8.1Landlord's Consent to Alterations.  Other than Permitted Alterations (as defined below), Tenant may not make or suffer to be made any improvements, alterations, additions, changes, or repairs (pursuant to Article 7 or otherwise) to the Premises or any mechanical, plumbing or HVAC facilities or systems pertaining to the Premises (collectively, the "Alterations") without first procuring the prior written consent of Landlord to such Alterations, which consent shall be requested by Tenant in accordance with the terms and conditions of this Article 8, and which consent shall not be unreasonably withheld by Landlord, provided it shall be deemed reasonable for Landlord to withhold its consent to any Alteration which adversely affects the structural portions or the systems or equipment of the Building or is visible from the exterior of the Building.  Landlord may impose, as a condition of its consent to any and all Alterations or repairs of the Premises or about the Premises, such requirements as Landlord in its sole discretion may deem desirable.  The construction of the initial improvements to the Premises shall be governed by the terms of the Tenant Work Letter and not the terms of this Article 8.  Notwithstanding the foregoing, Tenant shall be permitted to make Alterations following ten (10) business days' notice to Landlord, pursuant to the terms of this Article 8 except that Landlord's prior consent shall not be required, to the extent that such Alterations purely cosmetic in nature (such as painting the interior of the Premises and/or removal or installation of carpeting or other flooring within the Premises), does not require a building permit, and does not exceed $50,000 per Alteration (the "Cosmetic Alterations"), and, except as expressly set forth therein to the contrary, the terms of Section 8.2, below, shall not be applicable to such Cosmetic Alterations.  

8.2Manner of Construction.  Landlord shall have the exclusive right, at Landlord's option, but not the obligation, to make the Alterations at Tenant's sole cost and expense.  If Landlord elects to make the Alterations pursuant to the immediately preceding sentence, then Tenant shall retain Landlord to construct such Alterations and Landlord shall hold all applicable construction contracts.  Prior to the commencement of construction of any Alterations or repairs, Tenant shall submit to Landlord, for Landlord's review and approval in its reasonable discretion, four (4) copies signed by Tenant of all plans, specifications and working drawings relating thereto.  Tenant, at its sole cost and expense, shall retain an architect/space planner selected by Tenant, and reasonably approved by Landlord, to prepare such plans, specifications and working drawings; provided that, Tenant shall also retain the engineering consultants from a list provided by Landlord to prepare all plans and engineering working drawings, if any, relating to the structural, mechanical, electrical, plumbing, HVAC, lifesafety and sprinkler work of the Alterations.  Tenant shall be required to include in its contracts with the architect and the engineers a provision which requires ownership of all architectural and engineering drawings to be transferred to Tenant upon the substantial completion of the Alteration and Tenant hereby grants to Landlord a non-exclusive right to use such drawings, including, without limitation, a right to make copies thereof.  Tenant shall cause each architect/space planner and engineer

retained by Tenant to follow Landlord's standard construction administration procedures and to utilize the standard specifications and details for the Building, all as promulgated by Landlord from time to time.  Tenant and Tenant's architect/space planner shall verify, in the field, the dimensions and conditions as shown on the relevant portions of the "Base Building" plans, and Tenant and Tenant's architect/space planner shall be solely responsible for the same, and Landlord shall have no responsibility in connection therewith.  In addition, at Landlord's option, Landlord may submit Tenant's plans, specifications and working drawings to a third-party architect and/or engineer, selected by Landlord, for their review, at Tenant's sole cost and expense.  Landlord's review of plans, specifications and working drawings as set forth in this Section 8.2, shall be for its sole purpose and shall not imply Landlord's review of the same, or obligate Landlord to review the same, for quality, design, compliance with applicable building codes or other like matters.  Accordingly, notwithstanding that any plans, specifications or working drawings are reviewed by Landlord or its space planner, architect, engineers and consultants, and notwithstanding any advice or assistance which may be rendered to Tenant by Landlord or Landlord's space planner, architect, engineers, and consultants, Landlord shall have no liability whatsoever in connection therewith and shall not be responsible for any omissions or errors contained in the plans, specifications and working drawings for the Alterations, and Tenant's waiver and indemnity set forth in Section 10.1 of this Lease, below, shall specifically apply to the plans, specifications and working drawings for the Alterations.  Following Landlord's approval in its reasonable discretion of all plans, specifications and working drawings for the Alterations, a contractor to construct the Alterations shall be selected by Tenant from the list of contractors approved by Landlord.  Landlord shall provide to Tenant an itemized statement of costs, as set forth in the proposed contract with such contractor.  Tenant shall approve and deliver to Landlord the itemized statement of costs provided to Tenant in accordance with this Section 8.2, and upon receipt of such itemized statement of costs by Landlord, Landlord shall be released by Tenant (i) to retain the contractor who submitted such itemized statement of costs, and (ii) to purchase the items set forth in such itemized statement of costs and to commence the construction relating to such items.  Landlord hereby assigns to Tenant all warranties and guaranties by the contractor selected in accordance with this Section 8.2 to construct the Alterations, and Tenant hereby waives all claims against Landlord relating to, or arising out of the construction of, the Alterations.  In the event Tenant requests any Alterations in the Premises which require or give rise to governmentally required changes to the "Base Building," as that term is defined below, then Landlord shall, at Tenant's expense, make such changes to the Base Building.  As used in this Lease, the "Base Building" shall include the structural portions of the Building, and the public restrooms, elevators, exit stairwells and the systems and equipment located in the internal core of the Building on the floor or floors on which the Premises are located.  The term "Base Building," as used in this Lease, shall not be deemed to have the same meaning as the term "Base, Shell and Core," as the same is defined in Section 1 of the Tenant Work Letter.  In performing the work of any Alterations (including Cosmetic Alterations) for which Tenant is responsible, Tenant shall have the work performed in such manner so as not to obstruct access to the Project or any portion thereof, by any other tenant of the Project, and so as not to obstruct the business of Landlord or other tenants in the  Project.  With respect to any such Alterations (including Cosmetic Alterations), Tenant shall not use (and upon notice from Landlord shall cease using) contractors, services, workmen, labor, materials or equipment that, in Landlord's reasonable judgment, would disturb labor harmony with the workforce or trades engaged in performing other work, labor or services in or about the Building

or the Common Areas.  In addition to Tenant's obligations under Article 9 of this Lease, upon completion of any Alterations, Tenant agrees to cause a Notice of Completion to be recorded in the office of the Recorder of the County in which the Project is located in accordance with Section 3093 of the Civil Code of the State of California or any successor statute, and Tenant shall deliver to the Project construction manager a reproducible copy of the "as built" drawings of the Alterations in CAD format as well as all permits, approvals and other documents issued by any governmental agency in connection with the Alterations. 

8.3Payment for Improvements.  Tenant shall pay to Landlord, within ten (10) days after being billed for the same, all costs related to the construction of the Alterations, including, without limitation, the following items and costs:  (i) all amounts actually paid by Landlord to any architect/space planner, engineer, consultant, contractor, subcontractor, mechanic, materialman or other person, whether retained by Landlord or Tenant, in connection with the Alterations, and all fees incurred by, and the actual cost of documents and materials supplied by, Landlord and Landlord's consultants in connection with the preparation and review of all plans, specifications and working drawings for the Alterations; (ii) all plan check, permit and license fees relating to construction of the Alterations paid by Landlord; (iii) the cost of any changes in the Base Building when such changes are required by any plans, specifications or working drawings for the Alterations (including if such changes are due to the fact that such work is prepared on an unoccupied basis), such cost to include all direct architectural and/or engineering fees and expenses incurred by Landlord in connection therewith; (iv) the cost of any changes to the plans, specifications and working drawings for the Alterations or to the Alterations themselves required by all applicable zoning and building codes and other laws and paid by Landlord; (v) sales and use taxes and Title 24 fees imposed on, assessed against or paid by Landlord; (vi) Landlord's standard supervision fee for its involvement with such Alterations, which supervision fee shall be equal to five percent (5%) of the cost of each such Alteration; and (vii) all other actual and reasonable out-of-pocket costs incurred by Landlord in connection with the construction of the Alterations.  Landlord, at its option, may render bills to Tenant in advance of, or during, construction of the Alterations so as to enable Landlord to pay all costs and expenses incurred by Landlord in connection with the Alterations (including, without limitation, costs of the contractor retained to construct the Alterations) without advancing Landlord's own funds.  At Landlord's election in its sole and absolute discretion, Tenant shall deliver to Landlord prior to commencement of construction of the Alterations cash in an amount equal to all estimated costs related to the construction of such Alterations, or such lesser amount as Landlord shall specify, to be held by Landlord and disbursed by Landlord for costs related to the construction of the Alterations as such costs are incurred.  In the event that, after Tenant's approval of a cost proposal for the Alterations in accordance with Section 8.2, above, any revisions, changes or substitutions shall be made to the plans, specifications and working drawings or the Alterations, any additional costs which arise in connection with such revisions, changes or substitutions or any other additional costs shall be paid by Tenant to Landlord immediately upon Landlord's request.  Any surplus funds delivered by Tenant and held by Landlord in connection with the Alterations shall be refunded to Tenant when all costs related to the construction of the Alterations have been paid in full.

8.4Construction Insurance.  In the event that any Alterations are made pursuant to this Article 8, prior to the commencement of such Alterations, Tenant shall provide Landlord with certificates of insurance evidencing compliance with the requirements of Section 10.14 of

this Lease, it being understood and agreed that all of such Alterations shall be insured by Tenant pursuant to Article 10 of this Lease immediately upon completion thereof.  In addition, Landlord may, in its discretion, require Tenant to obtain a lien and completion bond or some alternate form of security satisfactory to Landlord in an amount sufficient to ensure the lien-free completion of such Alterations and naming Landlord as a co-obligee. 

8.5Landlord's Property.  All Alterations, improvements, fixtures, equipment and/or appurtenances which may be installed or placed in or about the Premises, from time to time, shall be at the sole cost of Tenant and shall be and become the property of Landlord; provided, however, Landlord may, by written notice to Tenant prior to the end of the Lease Term, or given following any earlier termination of this Lease, require Tenant, at Tenant's expense, to remove any Alterations or improvements and to repair any damage to the Premises and Building caused by such removal and return the affected portion of the Premises to their condition existing prior to the installation of such Alterations or improvements or, at Landlord's election, to a building standard tenant improved condition as determined by Landlord.  If Tenant fails to complete such removal and/or to repair any damage caused by the removal of any Alterations or improvements in the Premises and return the affected portion of the Premises to their condition existing prior to the installation of such Alterations or improvements or, if elected by Landlord, to a building standard tenant improved condition as determined by Landlord, prior to the expiration or earlier termination of this Lease, then Rent shall continue to accrue under this Lease in accordance with Article 16, below, after the end of the Lease Term until such work shall be completed, and Landlord shall have the right, but not the obligation, to perform such work and to charge the cost thereof to Tenant.  Tenant hereby protects, defends, indemnifies and holds Landlord harmless from any liability, cost, obligation, expense or claim of lien, including but not limited to, court costs and reasonable attorneys' fees, in any manner relating to the installation, placement, removal or financing of any such Alterations, improvements, fixtures and/or equipment in, on or about the Premises, which obligations of Tenant shall survive the expiration or earlier termination of this Lease.

ARTICLE 9

COVENANT AGAINST LIENS

Tenant shall keep the Project and Premises free from any liens or encumbrances arising out of the work performed, materials furnished or obligations incurred by or on behalf of Tenant, and shall protect, defend, indemnify and hold Landlord harmless from and against any claims, liabilities, judgments or costs (including, without limitation, reasonable attorneys' fees and costs) arising out of same or in connection therewith.  Tenant shall give Landlord notice at least twenty (20) days prior to the commencement of any work on the Premises which may give rise to a lien on the Premises or Building (or such additional time as may be necessary under applicable laws) to afford Landlord the opportunity of posting and recording appropriate notices of non-responsibility.  Tenant shall remove any such lien or encumbrance by bond or otherwise within five (5) days after notice by Landlord, and if Tenant shall fail to do so, Landlord may pay the amount necessary to remove such lien or encumbrance, without being responsible for investigating the validity thereof.  The amount so paid shall be deemed Additional Rent under this Lease payable upon demand, without limitation as to other remedies available to Landlord under this Lease.  Nothing contained in this Lease shall authorize Tenant to do any act which

shall subject Landlord's title to the Building or Premises to any liens or encumbrances whether claimed by operation of law or express or implied contract.  Any claim to a lien or encumbrance upon the Building or Premises arising in connection with any such work or respecting the Premises not performed by or at the request of Landlord shall be null and void, or at Landlord's option shall attach only against Tenant's interest in the Premises and shall in all respects be subordinate to Landlord's title to the Project, Building and Premises.

ARTICLE 10

TENANT'S INDEMNITY AND INSURANCE

10.1Tenant's Indemnity.  

10.1.1Indemnity.  To the maximum extent permitted by law, Tenant waives any right to contribution against the "Landlord Parties," as that term is defined in Section 10.13, below, and agrees to indemnify and save harmless the Landlord Parties from and against all claims of whatever nature arising from or claimed to have arisen from (i) any act, omission or negligence of the "Tenant Parties," as that term is defined in Section 10.13, below; (ii) any accident, injury or damage whatsoever caused to any person, or to the property of any person, occurring in or about the Premises from the earlier of (A) the date on which any Tenant Party first enters the Premises for any reason or (B) the Lease Commencement Date, and thereafter throughout and until the end of the Lease Term and after the end of the Lease Term for as long as Tenant or anyone acting by, through or under Tenant is in occupancy of the Premises or any portion thereof; (iii) any accident, injury or damage whatsoever occurring outside the Premises but within the Project, where such accident, injury or damage results, or is claimed to have resulted, from any act, omission or negligence on the part of any of the Tenant Parties; or (iv) any breach of this Lease by Tenant.  Tenant shall pay such indemnified amounts as they are incurred by the Landlord Parties. This indemnification shall not be construed to deny or reduce any other rights or obligations of indemnity that a Landlord Party may have under this Lease or the common law.  Notwithstanding anything contained herein to the contrary, Tenant shall not be obligated to indemnify a Landlord Party for any claims to the extent that such Landlord Party’s damages in fact result from such Landlord Party’s gross negligence or willful misconduct.

10.1.2Breach.  In the event that Tenant breaches any of its indemnity obligations hereunder or under any other contractual or common law indemnity: (i) Tenant shall pay to the Landlord Parties all liabilities, loss, cost, or expense (including attorney’s fees) incurred as a result of said breach, and the reasonable value of time expended by the Landlord Parties as a result of said breach; and (ii) the Landlord Parties may deduct and offset from any amounts due to Tenant under this Lease any amounts owed by Tenant pursuant to this section.  

10.1.3No limitation.  The indemnification obligations under this Section shall not be limited in any way by any limitation on the amount or type of damages, compensation or benefits payable by or for Tenant or any subtenant or other occupant of the Premises under workers' compensation acts, disability benefit acts, or other employee benefit acts. Tenant waives any immunity from or limitation on its indemnity or contribution liability to the Landlord Parties based upon such acts.

10.1.4Subtenants and other occupants.  Tenant shall require its subtenants and other occupants of the Premises to provide similar indemnities to the Landlord Parties in a form acceptable to Landlord. 

10.1.5Survival.  The terms of this section shall survive any termination or expiration of this Lease.

10.1.6Costs.  The foregoing indemnity and hold harmless agreement shall include indemnity for all costs, expenses and liabilities (including, without limitation, attorneys’ fees and disbursements) incurred by the Landlord Parties in connection with any such claim or any action or proceeding brought thereon, and the defense thereof.  In addition, in the event that any action or proceeding shall be brought against one or more Landlord Parties by reason of any such claim, Tenant, upon request from the Landlord Party, shall resist and defend such action or proceeding on behalf of the Landlord Party by counsel appointed by Tenant’s insurer (if such claim is covered by insurance without reservation) or otherwise by counsel reasonably satisfactory to the Landlord Party.  The Landlord Parties shall not be bound by any compromise or settlement of any such claim, action or proceeding without the prior written consent of such Landlord Parties.  

10.2Tenant's Risk.  Tenant agrees to use and occupy the Premises, and to use such other portions of the Building and the Project as Tenant is given the right to use by this Lease at Tenant’s own risk.  The Landlord Parties shall not be liable to the Tenant Parties for any damage, injury, loss, compensation, or claim (including, but not limited to, claims for the interruption of or loss to a Tenant Party’s business) based on, arising out of or resulting from any cause whatsoever, including, but not limited to, repairs to any portion of the Premises or the Building or the Project, any fire, robbery, theft, mysterious disappearance, or any other crime or casualty, the actions of any other tenants of the Building or of any other person or persons, or any leakage in any part or portion of the Premises or the Building or the Project, or from water, rain or snow that may leak into, or flow from any part of the Premises or the Building or the Project, or from drains, pipes or plumbing fixtures in the Building or the Project. Any goods, property or personal effects stored or placed in or about the Premises shall be at the sole risk of the Tenant Party, and neither the Landlord Parties nor their insurers shall in any manner be held responsible therefor.  The Landlord Parties shall not be responsible or liable to a Tenant Party, or to those claiming by, through or under a Tenant Party, for any loss or damage that may be occasioned by or through the acts or omissions of persons occupying adjoining premises or any part of the premises adjacent to or connecting with the Premises or any part of the Building or otherwise.  Notwithstanding the foregoing, the Landlord Parties shall not be released from liability for any injury, loss, damages or liability to the extent arising from any gross negligence or willful misconduct of the Landlord Parties on or about the Premises; provided, however, in no event shall the Landlord Parties have any liability to a Tenant Party based on any loss with respect to or interruption in the operation of Tenant’s business.  The provisions of this section shall be applicable until the expiration or earlier termination of the Lease Term, and during such further period as Tenant may use or be in occupancy of any part of the Premises or of the Building.  

10.3Tenant's Commercial General Liability Insurance. Tenant agrees to maintain in full force on or before the earlier of (i) the date on which any Tenant Party first enters the Premises for any reason or (ii) the Lease Commencement Date throughout the Lease Term of

this Lease, and thereafter, so long as Tenant is in occupancy of any part of the Premises, a policy of commercial general liability insurance, on an occurrence basis, issued on a form at least as broad as Insurance Services Office ("ISO") Commercial General Liability Coverage "occurrence" form CG 00 01 10 01 or another ISO Commercial General Liability "occurrence" form providing equivalent coverage. Such insurance shall include contractual liability coverage, specifically covering but not limited to the indemnification obligations undertaken by Tenant in this Lease. The minimum limits of liability of such insurance shall be $5,000,000.00 per occurrence. In addition, in the event Tenant hosts a function in the Premises, Tenant agrees to obtain, and cause any persons or parties providing services for such function to obtain, the appropriate insurance coverages as determined by Landlord (including liquor liability coverage, if applicable) and provide Landlord with evidence of the same. 

10.4Tenant's Property Insurance.  Tenant shall maintain at all times during the Lease Term, and during such earlier time as Tenant may be performing work in or to the Premises or have property, fixtures, furniture, equipment, machinery, goods, supplies, wares or merchandise on the Premises, and continuing thereafter so long as Tenant is in occupancy of any part of the Premises, business interruption insurance and (insurance against loss or damage covered by the so-called “Special Risk” type insurance coverage with respect to (i) Tenant’s property, fixtures, furniture, equipment, machinery, goods, supplies, wares and merchandise, and (ii) the "Tenant Improvements," as that term is defined in the Tenant Work Letter, and any other improvements which exist in the Premises as of the Lease Commencement Date (excluding the Base Building) (the "Original Improvements"), and all alterations, improvements and other modifications made by or on behalf of the Tenant in the Premises, and (iii) other property of Tenant located at the Premises (collectively “Tenant’s Property”).  The business interruption insurance required by this section shall be in minimum amounts typically carried by prudent tenants engaged in similar operations, but in no event shall be in an amount less than the Base Rent then in effect during any Lease Year, plus any Additional Rent due and payable for the immediately preceding Lease Year.  The “Special Risk” insurance required by this section shall be in an amount at least equal to the full replacement cost of Tenant’s Property.  In addition, during such time as Tenant is performing work in or to the Premises, Tenant, at Tenant’s expense, shall also maintain, or shall cause its contractor(s) to maintain, builder’s risk insurance for the full insurable value of such work.  Landlord and such additional persons or entities as Landlord may reasonably request shall be named as loss payees on the policy or policies required by this section.  In the event of loss or damage covered by the “Special Risk” insurance required by this section, the responsibilities for repairing or restoring the loss or damage shall be determined in accordance with Article 11 of this Lease, below.  To the extent that Landlord is obligated to pay for the repair or restoration of the loss or damage covered by the policy, Landlord shall be paid the proceeds of the “Special Risk” insurance covering the loss or damage.  To the extent Tenant is obligated to pay for the repair or restoration of the loss or damage, covered by the policy, Tenant shall be paid the proceeds of the “Special Risk” insurance covering the loss or damage.  If both Landlord and Tenant are obligated to pay for the repair or restoration of the loss or damage covered by the policy, the insurance proceeds shall be paid to each of them in the pro rata proportion of their obligations to repair or restore the loss or damage.  If the loss or damage is not repaired or restored (for example, if the Lease is terminated pursuant to Section 11.2 of this Lease, below), the insurance proceeds shall be paid to Landlord and Tenant in the pro rata proportion of their relative contributions to the cost of the leasehold improvements covered by the policy.  

10.5Tenant's Other Insurance. Throughout the Lease Term, Tenant shall obtain and maintain (1) comprehensive automobile liability insurance (covering any automobiles owned or operated by Tenant at the Project) issued on a form at least as broad as ISO Business Auto Coverage form CA 00 01 07 97 or other form providing equivalent coverage; (2) worker's compensation insurance or participation in a monopolistic state workers' compensation fund; and (3) employer's liability insurance or (in a monopolistic state) Stop Gap Liability insurance.  Such automobile liability insurance shall be in an amount not less than One Million Dollars ($1,000,000) for each accident. Such worker's compensation insurance shall carry minimum limits as defined by the law of the jurisdiction in which the Premises are located (as the same may be amended from time to time). Such employer's liability insurance shall be in an amount not less than One Million Dollars ($1,000,000) for each accident, One Million Dollars ($1,000,000) disease-policy limit, and One Million Dollars ($1,000,000) disease-each employee. 

10.6Requirements For Insurance.  All insurance required to be maintained by Tenant pursuant to this Lease shall be maintained with responsible companies that are admitted to do business, and are in good standing, in the jurisdiction in which the Premises are located and that have a rating of at least "A" and are within a financial size category of not less than "Class X" in the most current Best's Key Rating Guide or such similar rating as may be reasonably selected by Landlord. All such insurance shall: (1) be acceptable in form and content to Landlord; and (2) be primary and noncontributory.  In addition, Tenant shall promptly notify Landlord in the event of any cancellation, failure to renew, reduction of amount of insurance, or change in coverage of any such policy.  No such policy shall contain any self-insured retention greater than $25,000.00. Any deductibles and such self-insured retentions shall be deemed to be "insurance" for purposes of the waiver in Section 10.13 of this Lease, below. Landlord reserves the right from time to time to require Tenant to obtain higher minimum amounts of insurance based on such limits as are customarily carried with respect to the Comparable Buildings. The minimum amounts of insurance required by this Lease shall not be reduced by the payment of claims or for any other reason. In the event Tenant shall fail to obtain or maintain any insurance meeting the requirements of this Article, or to deliver such policies or certificates as required by this Article, Landlord may, at its option, on five (5) days' notice to Tenant, procure such policies for the account of Tenant, and the cost thereof shall be paid to Landlord within five (5) days after delivery to Tenant of bills therefor.

10.7Additional Insureds. The commercial general liability and auto insurance carried by Tenant pursuant to this Lease, and any additional liability insurance carried by Tenant pursuant to Section 10.3 of this Lease, above, shall name Landlord, Landlord's managing agent, and such other persons as Landlord may reasonably request from time to time as additional insureds with respect to liability arising out of or related to this Lease or the operations of Tenant (collectively "Additional Insureds"). Such insurance shall provide primary coverage without contribution from any other insurance carried by or for the benefit of Landlord, Landlord's managing agent, or other Additional Insureds. Such insurance shall also waive any right of subrogation against each Additional Insured.

10.8Certificates Of Insurance. On or before the earlier of (i) the date on which any Tenant Party first enters the Premises for any reason or (ii) the Lease Commencement Date, Tenant shall furnish Landlord with certificates evidencing the insurance coverage required by this Lease, and renewal certificates shall be furnished to Landlord within five (5) days following

the expiration date of each policy for which a certificate was furnished. (Acceptable forms of such certificates for liability and property insurance, respectively, are attached hereto as Exhibit G.) In jurisdictions requiring mandatory participation in a monopolistic state workers' compensation fund, the insurance certificate requirements for the coverage required for workers' compensation will be satisfied by a letter from the appropriate state agency confirming participation in accordance with statutory requirements. Such current participation letters required by this Section shall be provided every six (6) months for the duration of this Lease. Failure by the Tenant to provide the certificates or letters required by this Section shall not be deemed to be a waiver of the requirements in this Section. Upon request by Landlord, a true and complete copy of any insurance policy required by this Lease shall be delivered to Landlord within ten (10) days following Landlord's request. 

10.9Subtenants And Other Occupants.  Tenant shall require its subtenants and other occupants of the Premises to provide written documentation evidencing the obligation of such subtenant or other occupant to indemnify the Landlord Parties to the same extent that Tenant is required to indemnify the Landlord Parties pursuant to Section 10.1 of this Lease, above, and to maintain insurance that meets the requirements of this Article, and otherwise to comply with the requirements of this Article. Tenant shall require all such subtenants and occupants to supply certificates of insurance evidencing that the insurance requirements of this Article have been met and shall forward such certificates to Landlord on or before the earlier of (i) the date on which the subtenant or other occupant or any of their respective direct or indirect partners, officers, shareholders, directors, members, trustees, beneficiaries, servants, employees, principals, contractors, licensees, agents, invitees or representatives first enters the Premises or (ii) the commencement of the sublease. Tenant shall be responsible for identifying and remedying any deficiencies in such certificates or policy provisions.

10.10No Violation Of Building Policies. Tenant shall not commit or permit any violation of the policies of fire, boiler, sprinkler, water damage or other insurance covering the Project and/or the fixtures, equipment and property therein carried by Landlord, or do or permit anything to be done, or keep or permit anything to be kept, in the Premises, which in case of any of the foregoing (i) would result in termination of any such policies, (ii) would adversely affect Landlord's right of recovery under any of such policies, or (iii) would result in reputable and independent insurance companies refusing to insure the Project or the property of Landlord in amounts reasonably satisfactory to Landlord.

10.11Tenant To Pay Premium Increases. If, because of anything done, caused or permitted to be done, or omitted by Tenant (or its subtenant or other occupants of the Premises), the rates for liability, fire, boiler, sprinkler, water damage or other insurance on the Project or on the property and equipment of Landlord or any other tenant or subtenant in the Building shall be higher than they otherwise would be, Tenant shall reimburse Landlord and/or the other tenants and subtenants in the Building for the additional insurance premiums thereafter paid by Landlord or by any of the other tenants and subtenants in the Building which shall have been charged because of the aforesaid reasons, such reimbursement to be made from time to time on Landlord's demand.

10.12Landlord's Insurance. 

10.12.1Required insurance. Landlord shall maintain insurance against loss or damage with respect to the Building on an "Special Risk" type insurance form, with customary exceptions, subject to such deductibles and self-insured retentions as Landlord may determine, in an amount equal to at least the replacement value of the Building. The cost of such insurance shall be treated as a part of Operating Expenses. Such insurance shall be maintained with an insurance company selected by Landlord. Payment for losses thereunder shall be made solely to Landlord.  

10.12.2Optional insurance. Landlord may maintain such additional insurance with respect to the Building and the Project, including, without limitation, earthquake insurance, terrorism insurance, flood insurance, liability insurance and/or rent insurance, as Landlord may in its sole discretion elect. Landlord may also maintain such other insurance as may from time to time be required by a "Mortgagee," as that term is defined in Section 18.2 of this Lease, below. The cost of all such additional insurance shall also be part of the Operating Expenses.  

10.12.3Blanket and self-insurance. Any or all of Landlord's insurance may be provided by blanket coverage maintained by Landlord or any affiliate of Landlord under its insurance program for its portfolio of properties, or by Landlord or any affiliate of Landlord under a program of self-insurance, and in such event Operating Expenses shall include the portion of the reasonable cost of blanket insurance or self-insurance that is allocated to the Building.

10.12.4No obligation. Landlord shall not be obligated to insure, and shall not assume any liability of risk of loss for, Tenant's Property, including any such property or work of tenant's subtenants or occupants. Landlord will also have no obligation to carry insurance against, nor be responsible for, any loss suffered by Tenant, subtenants or other occupants due to interruption of Tenant's or any subtenant's or occupant's business.

10.13Waiver Of Subrogation. The parties hereto waive and release any and all rights of recovery against the other, and agree not to seek to recover from the other or to make any claim against the other, and in the case of Landlord, against all Tenant Parties, and in the case of Tenant, against all Landlord Parties, for any loss or damage incurred by the waiving/releasing party to the extent such loss or damage is insured under any insurance policy required by this Lease or which would have been so insured had the party carried the insurance it was required to carry hereunder. Tenant shall obtain from its subtenants and other occupants of the Premises a similar waiver and release of claims against any or all of Tenant or Landlord. The insurance policies required by this Lease shall contain no provision that would invalidate or restrict the parties' waiver and release of the rights of recovery in this section. The parties hereto covenant that no insurer shall hold any right of subrogation against the parties hereto by virtue of such insurance policy.

The term "Landlord Party" or "Landlord Parties" shall mean Landlord, any affiliate of Landlord, Landlord's managing agents for the Building, each Mortgagee, each ground lessor, and each of their respective direct or indirect partners, officers, shareholders, directors,

members, trustees, beneficiaries, servants, employees, principals, contractors, licensees, agents or representatives. For the purposes of this Lease, the term "Tenant Party" or "Tenant Parties" shall mean Tenant, any affiliate of Tenant, any permitted subtenant or any other permitted occupant of the Premises, and each of their respective direct or indirect partners, officers, shareholders, directors, members, trustees, beneficiaries, servants, employees, principals, contractors, licensees, agents, invitees or representatives.

10.14Tenant's Work.  During such times as Tenant is performing work or having work or services performed in or to the Premises, Tenant shall require its contractors, and their subcontractors of all tiers, to obtain and maintain commercial general liability, automobile, workers compensation, employer’s liability, builder’s risk, and equipment/property insurance in such amounts and on such terms as are customarily required of such contractors and subcontractors on similar projects.  The amounts and terms of all such insurance are subject to Landlord’s written approval, which approval shall not be unreasonably withheld.  The commercial general liability and auto insurance carried by Tenant’s contractors and their subcontractors of all tiers pursuant to this section shall name Landlord, Landlord's managing agent, and such other Persons as Landlord may reasonably request from time to time as additional insureds with respect to liability arising out of or related to their work or services (collectively, “Additional Insureds”).  Such insurance shall provide primary coverage without contribution from any other insurance carried by or for the benefit of Landlord, Landlord's managing agent, or other Additional Insureds.  Such insurance shall also waive any right of subrogation against each Additional Insured.  Tenant shall obtain and submit to Landlord, prior to the earlier of (i) the entry onto the Premises by such contractors or subcontractors or (ii) commencement of the work or services, certificates of insurance evidencing compliance with the requirements of this section.  

ARTICLE 11

DAMAGE AND DESTRUCTION

11.1Repair of Damage to Premises by Landlord.  Tenant shall promptly notify Landlord of any damage to the Premises resulting from fire or any other casualty.  If the Premises or any Common Areas necessary to Tenant's use of or access to the Premises shall be damaged by fire or other casualty, Landlord shall promptly and diligently, subject to reasonable delays for insurance adjustment or other matters beyond Landlord's reasonable control, and subject to all other terms of this Article 11, restore the Base Building and such Common Areas.  Such restoration shall be to substantially the same condition of the Base Building and the Common Areas prior to the casualty, except for modifications required by zoning and building codes and other laws or by the holder of a mortgage on the Building or Project or any other modifications to the Common Areas deemed desirable by Landlord, provided that access to the Premises and any common restrooms serving the Premises shall not be materially impaired.  Upon the occurrence of any damage to the Premises, upon notice (the "Landlord Repair Notice") to Tenant from Landlord, Tenant shall assign to Landlord (or to any party designated by Landlord) all insurance proceeds payable to Tenant under Tenant's insurance required under item (ii) of Section 10.4 of this Lease, and Landlord shall repair any injury or damage to the Tenant Improvements and the Original Improvements installed in the Premises and shall return such Tenant Improvements and Original Improvements to their original condition; provided that if the cost of such repair by Landlord exceeds the amount of insurance proceeds received by Landlord

from Tenant's insurance carrier, as assigned by Tenant, the cost of such repairs shall be paid by Tenant to Landlord prior to Landlord's commencement of repair of the damage.  In the event that Landlord does not deliver the Landlord Repair Notice within sixty (60) days following the date the casualty becomes known to Landlord, Tenant shall, at its sole cost and expense, repair any injury or damage to the Tenant Improvements and the Original Improvements installed in the Premises and shall return such Tenant Improvements and Original Improvements to their original condition.  Whether or not Landlord delivers a Landlord Repair Notice, prior to the commencement of construction, Tenant shall submit to Landlord, for Landlord's review and approval, all plans, specifications and working drawings relating thereto, and Tenant shall select the contractors to perform such improvement work subject to Landlord's reasonable approval.  Landlord shall not be liable for any inconvenience or annoyance to Tenant or its visitors, or injury to Tenant's business resulting in any way from such damage or the repair thereof; provided, however, if such fire or other casualty shall have damaged the Premises or a portion thereof or Common Areas necessary to Tenant's occupancy, then Landlord shall allow Tenant a proportionate abatement of Rent during the time and to the extent and in the proportion that the Premises or such portion thereof are unfit for occupancy for the purposes permitted under this Lease, and are not occupied by Tenant as a result thereof, provided that such abatement of Rent shall be allowed only to the extent Landlord is reimbursed from the proceeds of rental interruption insurance purchased by Landlord as part of Operating Expenses; provided further, however, if the damage or destruction is due to the negligence or willful misconduct of Tenant or any of its agents, employees, contractors, invitees or guests, then Tenant shall be responsible for any reasonable, applicable insurance deductible (which shall be payable to Landlord upon demand, but which may be paid under protest) and there shall be no rent abatement.  In the event that Landlord shall not deliver the Landlord Repair Notice, Tenant's right to rent abatement pursuant to the preceding sentence shall terminate as of the date which is reasonably determined by Landlord to be the date Tenant should have completed repairs to the Premises assuming Tenant used reasonable due diligence in connection therewith. 

11.2Landlord's Option to Repair.  Notwithstanding the terms of Section 11.1 of this Lease, Landlord may elect not to rebuild and/or restore the Premises, Building and/or Project, and instead terminate this Lease, by notifying Tenant in writing of such termination within sixty (60) days after the date of discovery of the damage, such notice to include a termination date giving Tenant sixty (60) days to vacate the Premises, but Landlord may so elect only if the Building or Project shall be damaged by fire or other casualty or cause, whether or not the Premises are affected, and one or more of the following conditions is present:  (i) in Landlord's reasonable judgment, repairs cannot reasonably be completed within two hundred ten (210) days after the date of discovery of the damage (when such repairs are made without the payment of overtime or other premiums); (ii) the holder of any mortgage on the Building or Project or ground lessor with respect to the Building or Project shall require that the insurance proceeds or any portion thereof be used to retire the mortgage debt, or shall terminate the ground lease, as the case may be; (iii) the damage is not fully covered by Landlord's insurance policies or that portion of the proceeds from Landlord's insurance policies allocable to the Building or the Project, as the case may be; (iv) Landlord decides to rebuild the Building or Common Areas so that they will be substantially different structurally or architecturally; (v) the damage occurs during the last twelve (12) months of the Lease Term; or (vi) any owner of any other portion of the Project, other than Landlord, does not intend to repair the damage to such portion of the Project; provided, however, that if such fire or other casualty shall have damaged the Premises or a portion thereof or

Common Areas necessary to Tenant's occupancy and as a result of such damage the Premises are unfit for occupancy, and provided that Landlord does not elect to terminate this Lease pursuant to Landlord's termination right as provided above, and either (a) the repairs cannot, in the reasonable opinion of Landlord's contractor, be completed within two hundred ten (210) days after being commenced, or (b) the damage occurs during the last twelve months of the Lease Term and will reasonably require in excess of ninety (90) days to repair, Tenant may elect, no earlier than sixty (60) days after the date of the damage and not later than ninety (90) days after the date of such damage, to terminate this Lease by written notice to Landlord effective as of the date specified in the notice, which date shall not be less than thirty (30) days nor more than sixty (60) days after the date such notice is given by Tenant. 

11.3Waiver of Statutory Provisions.  The provisions of this Lease, including this Article 11, constitute an express agreement between Landlord and Tenant with respect to any and all damage to, or destruction of, all or any part of the Premises, the Building or the Project, and any statute or regulation of the State of California, including, without limitation, Sections 1932(2) and 1933(4) of the California Civil Code, with respect to any rights or obligations concerning damage or destruction in the absence of an express agreement between the parties, and any other statute or regulation, now or hereafter in effect, shall have no application to this Lease or any damage or destruction to all or any part of the Premises, the Building or the Project.

ARTICLE 12

NONWAIVER

No provision of this Lease shall be deemed waived by either party hereto unless expressly waived in a writing signed thereby.  The waiver by either party hereto of any breach of any term, covenant or condition herein contained shall not be deemed to be a waiver of any subsequent breach of same or any other term, covenant or condition herein contained.  The subsequent acceptance of Rent hereunder by Landlord shall not be deemed to be a waiver of any preceding breach by Tenant of any term, covenant or condition of this Lease, other than the failure of Tenant to pay the particular Rent so accepted, regardless of Landlord's knowledge of such preceding breach at the time of acceptance of such Rent.  No acceptance of a lesser amount than the Rent herein stipulated shall be deemed a waiver of Landlord's right to receive the full amount due, nor shall any endorsement or statement on any check or payment or any letter accompanying such check or payment be deemed an accord and satisfaction, and Landlord may accept such check or payment without prejudice to Landlord's right to recover the full amount due.  No receipt of monies by Landlord from Tenant after the termination of this Lease shall in any way alter the length of the Lease Term or of Tenant's right of possession hereunder, or after the giving of any notice shall reinstate, continue or extend the Lease Term or affect any notice given Tenant prior to the receipt of such monies, it being agreed that after the service of notice or the commencement of a suit, or after final judgment for possession of the Premises, Landlord may receive and collect any Rent due, and the payment of said Rent shall not waive or affect said notice, suit or judgment.  No payment of Rent by Tenant after a breach by Landlord shall be deemed a waiver of any breach by Landlord.

ARTICLE 13

CONDEMNATION

If the whole or any part of the Premises, Building or Project shall be taken by power of eminent domain or condemned by any competent authority for any public or quasi-public use or purpose, or if any adjacent property or street shall be so taken or condemned, or reconfigured or vacated by such authority in such manner as to require the use, reconstruction or remodeling of any part of the Premises, Building or Project, or if Landlord shall grant a deed or other instrument in lieu of such taking by eminent domain or condemnation, Landlord shall have the option to terminate this Lease effective as of the date possession is required to be surrendered to the authority.  If more than twenty-five percent (25%) of the rentable square feet of the Premises is taken, or if all reasonable access to the Premises is substantially impaired, in each case for a period in excess of one hundred twenty (120) days, Tenant shall have the option to terminate this Lease effective as of the date possession is required to be surrendered to the authority.  Tenant shall not because of such taking assert any claim against Landlord or the authority for any compensation because of such taking and Landlord shall be entitled to the entire award or payment in connection therewith, except that Tenant shall have the right to file any separate claim available to Tenant for any taking of Tenant's personal property and fixtures belonging to Tenant and removable by Tenant upon expiration of the Lease Term pursuant to the terms of this Lease, and for moving expenses, so long as such claim is payable separately to Tenant.  All Rent shall be apportioned as of the date of such termination.  If any part of the Premises shall be taken, and this Lease shall not be so terminated, the Rent shall be proportionately abated.  Tenant hereby waives any and all rights it might otherwise have pursuant to Section 1265.130 of the California Code of Civil Procedure.  Notwithstanding anything to the contrary contained in this Article 13, in the event of a temporary taking of all or any portion of the Premises for a period of one hundred eighty (180) days or less, then this Lease shall not terminate but the Base Rent and the Additional Rent shall be abated for the period of such taking in proportion to the ratio that the amount of rentable square feet of the Premises taken bears to the total rentable square feet of the Premises.  Landlord shall be entitled to receive the entire award made in connection with any such temporary taking.

ARTICLE 14

ASSIGNMENT AND SUBLETTING

14.1Transfers.  Tenant shall not, without the prior written consent of Landlord, assign, mortgage, pledge, hypothecate, encumber, or permit any lien to attach to, or otherwise transfer, this Lease or any interest hereunder, permit any assignment, or other transfer of this Lease or any interest hereunder by operation of law, sublet the Premises or any part thereof, or enter into any license or concession agreements or otherwise permit the occupancy or use of the Premises or any part thereof by any persons other than Tenant and its employees and contractors (all of the foregoing are hereinafter sometimes referred to individually as a "Transfer," and, collectively, as "Transfers" and any person to whom any Transfer is made or sought to be made is hereinafter sometimes referred to as a "Transferee").  If Tenant desires Landlord's consent to any Transfer, Tenant shall notify Landlord in writing, which notice (the "Transfer Notice") shall include (i) the proposed effective date of the Transfer, which shall not be less than thirty (30)

days nor more than one hundred eighty (180) days after the date of delivery of the Transfer Notice, (ii) a description of the portion of the Premises to be transferred (the "Subject Space"), (iii) all of the terms of the proposed Transfer and the consideration therefor, including calculation of the "Transfer Premium", as that term is defined in Section 14.3 below, in connection with such Transfer, the name and address of the proposed Transferee, and a copy of all existing executed and/or proposed documentation pertaining to the proposed Transfer, including all existing operative documents to be executed to evidence such Transfer or the agreements incidental or related to such Transfer, provided that Landlord shall have the right to require Tenant to utilize Landlord's standard Transfer documents in connection with the documentation of such Transfer, (iv) current financial statements of the proposed Transferee certified by an officer, partner or owner thereof, business credit and personal references and history of the proposed Transferee and any other information required by Landlord which will enable Landlord to determine the financial responsibility, character, and reputation of the proposed Transferee, nature of such Transferee's business and proposed use of the Subject Space, and (v) an executed estoppel certificate from Tenant in the form attached hereto as Exhibit E.  Any Transfer made without Landlord's prior written consent shall, at Landlord's option, be null, void and of no effect, and shall, at Landlord's option, constitute a default by Tenant under this Lease.  Whether or not Landlord consents to any proposed Transfer, Tenant shall pay Landlord's review and processing fees, as well as any reasonable professional fees (including, without limitation, attorneys', accountants', architects', engineers' and consultants' fees) incurred by Landlord, within thirty (30) days after written request by Landlord. 

14.2Landlord's Consent.  Landlord shall not unreasonably withhold its consent to any proposed Transfer of the Subject Space to the Transferee on the terms specified in the Transfer Notice.  Without limitation as to other reasonable grounds for withholding consent, the parties hereby agree that it shall be reasonable under this Lease and under any applicable law for Landlord to withhold consent to any proposed Transfer where one or more of the following apply:

14.2.1The Transferee is of a character or reputation or engaged in a business which is not consistent with the quality of the Building or the Project, or would be a significantly less prestigious occupant of the Building than Tenant;

14.2.2The Transferee intends to use the Subject Space for purposes which are not permitted under this Lease;

14.2.3The Transferee is either a governmental agency or instrumentality thereof;

14.2.4The Transferee is not a party of reasonable financial worth and/or financial stability in light of the responsibilities to be undertaken in connection with the Transfer on the date consent is requested;

14.2.5The proposed Transfer would cause a violation of another lease for space in the Project, or would give an occupant of the Project a right to cancel its lease;

14.2.6Either the proposed Transferee, or any person or entity which directly or indirectly, controls, is controlled by, or is under common control with, the proposed Transferee,

(i) occupies space in the Project at the time of the request for consent, or (ii) is negotiating or has negotiated with Landlord to lease space in the Project, or (iii) Landlord is currently meeting with (or has previously met with) the proposed Transferee to tour space in the Project; 

14.2.7In Landlord's reasonable judgment, the use of the Premises by the proposed Transferee would not be comparable to the types of office use by other tenants in the Project, would entail any alterations which would lessen the value of the tenant improvements in the Premises, would result in more than a reasonable density of occupants per square foot of the Premises, would increase the burden on elevators or other Building systems or equipment over the burden thereon prior to the proposed Transfer, or would require increased services by Landlord;

14.2.8Intentionally Omitted;

14.2.9The proposed Transfer is of less than the entire Premises; or

14.2.10Any part of the rent payable under the proposed Transfer shall be based in whole or in part on the income or profits derived from the Subject Space or if any proposed Transfer shall potentially have any adverse effect on the real estate investment trust qualification requirements applicable to Landlord and its affiliates.

If Landlord consents to any Transfer pursuant to the terms of this Section 14.2 (and does not exercise any recapture rights Landlord may have under Section 14.4 of this Lease), Tenant may within six (6) months after Landlord's consent, but not later than the expiration of said six-month period, enter into such Transfer of the Premises or portion thereof, upon substantially the same terms and conditions as are set forth in the Transfer Notice furnished by Tenant to Landlord pursuant to Section 14.1 of this Lease, provided that if there are any changes in the terms and conditions from those specified in the Transfer Notice (i) such that Landlord would initially have been entitled to refuse its consent to such Transfer under this Section 14.2, or (ii) which would cause the proposed Transfer to be more favorable to the Transferee than the terms set forth in Tenant's original Transfer Notice, Tenant shall again submit the Transfer to Landlord for its approval and other action under this Article 14 (including Landlord's right of recapture, if any, under Section 14.4 of this Lease).  Notwithstanding anything to the contrary in this Lease, if Tenant or any proposed Transferee claims that Landlord has unreasonably withheld or delayed its consent under Section 14.2 or otherwise has breached or acted unreasonably under this Article 14, their sole remedies shall be a declaratory judgment and an injunction for the relief sought, and Tenant hereby waives the provisions of Section 1995.310 of the California Civil Code, or any successor statute, and all other remedies, including, without limitation, any right at law or equity to terminate this Lease, on its own behalf and, to the extent permitted under all applicable laws, on behalf of the proposed Transferee.  Tenant shall indemnify, defend and hold harmless Landlord from any and all liability, losses, claims, damages, costs, expenses, causes of action and proceedings involving any third party or parties (including without limitation Tenant's proposed subtenant or assignee) who claim they were damaged by Landlord's wrongful withholding or conditioning of Landlord's consent.

14.3Transfer Premium.  If Landlord consents to a Transfer, as a condition thereto which the parties hereby agree is reasonable, Tenant shall pay to Landlord seventy-five percent

(75%) of any "Transfer Premium," as that term is defined in this Section 14.3, received by Tenant from such Transferee.  "Transfer Premium" shall mean all rent, additional rent or other consideration payable by such Transferee in connection with the Transfer in excess of the Rent and Additional Rent payable by Tenant under this Lease during the term of the Transfer on a per rentable square foot basis if less than all of the Premises is transferred, after deducting the reasonable expenses incurred by Tenant for (i) any changes, alterations and improvements to the Premises in connection with the Transfer, (ii) any free base rent reasonably provided to the Transferee in connection with the Transfer (provided that such free rent shall be deducted only to the extent the same is included in the calculation of total consideration payable by such Transferee), and (iii) any brokerage commissions in connection with the Transfer and (iv) legal fees reasonably incurred in connection with the Transfer (collectively, "Tenant's Subleasing Costs").  "Transfer Premium" shall also include, but not be limited to, key money, bonus money or other cash consideration paid by Transferee to Tenant in connection with such Transfer, and any payment in excess of fair market value for services rendered by Tenant to Transferee or for assets, fixtures, inventory, equipment, or furniture transferred by Tenant to Transferee in connection with such Transfer.  Landlord shall make a determination of the amount of Landlord's applicable share of the Transfer Premium on a monthly basis as rent or other consideration is paid by Transferee to Tenant under the Transfer.  For purposes of calculating the Transfer Premium on a monthly basis, Tenant's Subleasing Costs shall be deemed to be expended by Tenant in equal monthly amounts over the entire term of the Transfer. 

14.4Landlord's Option as to Subject Space.  Notwithstanding anything to the contrary contained in this Article 14, Landlord shall have the option, by giving written notice to Tenant within thirty (30) days after receipt of any Transfer Notice, to (i) recapture the Subject Space, or (ii) take an assignment or sublease of the Subject Space from Tenant; provided, however, Landlord shall have no right to recapture space with respect to (A) a sublease for less than the remainder of the Lease Term (for purposes hereof, a sublease shall be deemed to be for the remainder of the Lease Term if, assuming all sublease renewal or extension rights are exercised, such sublease shall expire during the final twelve (12) months of the Lease Term), or (B) an assignment or sublease pursuant to the terms of Section 14.8, below.  Such recapture or sublease or assignment notice, shall cancel and terminate this Lease, or create a sublease or assignment, as the case may be, with respect to the Subject Space as of the date stated in the Transfer Notice as the effective date of the proposed Transfer.  In the event of a recapture by Landlord, if this Lease shall be canceled with respect to less than the entire Premises, then (i) the Rent reserved herein shall be prorated on the basis of the number of rentable square feet retained by Tenant in proportion to the number of rentable square feet contained in the Premises; (ii) this Lease as so amended shall continue thereafter in full force and effect, and upon request of either party, the parties shall execute written confirmation of the same; and (iii) Landlord shall construct or cause to be constructed a demising wall separating that portion of the Premises recaptured by Landlord from that portion of the Premises retained by Tenant; provided that, Tenant hereby agrees that, notwithstanding Tenant's occupancy of its retained portion of the Premises during the construction of such demising wall by Landlord, Landlord shall be permitted to construct such demising wall during normal business hours, without any obligation to pay overtime or other premiums, and the construction of such demising wall by Landlord shall in no way constitute a constructive eviction of Tenant nor entitle Tenant to any abatement of Rent, and Landlord shall have no responsibility or for any reason be liable to Tenant for any direct or indirect injury to or interference with Tenant's business arising from the construction of such

demising wall, nor shall Tenant be entitled to any compensation or damages from Landlord for loss of the use of the whole or any part of its retained portion of the Premises or of Tenant's personal property or improvements resulting from the construction of such demising wall, or for any inconvenience or annoyance occasioned by the construction of such demising wall; and provided further that, Tenant shall be responsible for, and shall pay to Landlord promptly upon being billed therefor, fifty percent (50%) of all costs related to the construction of such demising wall, including Landlord's standard fee for its involvement with such demising wall.  If Landlord declines, or fails to elect in a timely manner, to recapture, sublease or take an assignment of the Subject Space under this Section 14.4, then, provided Landlord has consented to the proposed Transfer, Tenant shall be entitled to proceed to transfer the Subject Space to the proposed Transferee, subject to provisions of this Article 14. 

14.5Effect of Transfer.  If Landlord consents to a Transfer, then (i) the terms and conditions of this Lease shall in no way be deemed to have been waived or modified; (ii) such consent shall not be deemed consent to any further Transfer by either Tenant or a Transferee; (iii) Tenant shall deliver to Landlord, promptly after execution, an original executed copy of all documentation pertaining to the Transfer in form and content reasonably acceptable to Landlord, including, without limitation, at Landlord's option, a "Transfer Agreement," as that term is defined in this Section 14.5, below; (iv) Tenant shall furnish upon Landlord's request a complete statement, certified by an independent certified public accountant, or Tenant's chief financial officer, setting forth in detail the computation of any Transfer Premium Tenant has derived and shall derive from such Transfer; and (v) no Transfer relating to this Lease or agreement entered into with respect thereto, whether with or without Landlord's consent, shall relieve Tenant or any guarantor of the Lease from any liability under this Lease, including, without limitation, in connection with the Subject Space, and, in the event of a Transfer of Tenant's entire interest in this Lease, the liability of Tenant and such Transferee shall be joint and several.  Landlord or its authorized representatives shall have the right at all reasonable times to audit the books, records and papers of Tenant relating to any Transfer, and shall have the right to make copies thereof.  If the Transfer Premium respecting any Transfer shall be found understated, Tenant shall, within thirty (30) days after demand, pay the deficiency, and if understated by more than two percent (2%), Tenant shall pay Landlord's costs of such audit.  Notwithstanding anything to the contrary contained in this Article 14, Landlord, at its option in its sole and absolute discretion, may require, as a condition to the validity of any Transfer, that both Tenant and such Transferee enter into a separate written agreement directly with Landlord (a "Transfer Agreement"), which Transfer Agreement, among other things, shall create privity of contract between Landlord and such Transferee with respect to the provisions of this Article 14, and shall contain such terms and provisions as Landlord may reasonably require, including, without limitation, the following:  (A) such Transferee's agreement to be bound by all the obligations of Tenant under this Lease (including, but not limited to, Tenant's obligation to pay Rent), provided that, in the event of a Transfer of less than the entire Premises, the obligations to which such Transferee shall agree to be so bound shall be prorated on a basis of the number of rentable square feet of the Subject Space in proportion to the number of square feet in the Premises; (B) such Transferee's acknowledgment of, and agreement that such Transfer shall be subordinate and subject to, Landlord's rights under Section 19.3 of this Lease; and (C) Tenant's and such Transferee's recognition of and agreement to be bound by all the terms and provisions of this Article 14, including, but not limited to, any such terms and provisions which Landlord, at its option, requires to be expressly set forth in such Transfer Agreement.  Upon the occurrence of any

default by Transferee under such Transfer, Landlord shall have the right, at its option, but not the obligation, on behalf of Tenant, to pursue any or all of the remedies available to Tenant under such Transfer or at law or in equity (all of which remedies shall be distinct, separate and cumulative). 

14.6Occurrence of Default.  Any Transfer hereunder, whether or not such Transferee shall have executed a Transfer Agreement, shall be subordinate and subject to the provisions of this Lease, and if this Lease shall be terminated during the term of any Transfer, then Landlord shall have all of the rights set forth in Section 19.3 of this Lease with respect to such Transfer.  In addition, if Tenant shall be in default under this Lease, then Landlord is hereby irrevocably authorized, as Tenant's agent and attorney-in-fact, to direct any Transferee to make all payments under or in connection with a Transfer directly to Landlord (which payments Landlord shall apply towards Tenant's obligations under this Lease) until such default is cured.  Such Transferee shall rely on any representation by Landlord that Tenant is in default hereunder, without any need for confirmation thereof by Tenant.  Upon any assignment, the assignee shall assume in writing all obligations and covenants of Tenant thereafter to be performed or observed under this Lease.  No collection or acceptance of rent by Landlord from any Transferee shall be deemed a waiver of any provision of this Article 14 or the approval of any Transferee or a release of Tenant from any obligation under this Lease, whether theretofore or thereafter accruing.  In no event shall Landlord's enforcement of any provision of this Lease against any Transferee be deemed a waiver of Landlord's right to enforce any term of this Lease against Tenant or any other person.  If Tenant's obligations hereunder have been guaranteed, Landlord's consent to any Transfer shall not be effective unless the guarantor also consents to such Transfer.

14.7Additional Transfers.  For purposes of this Lease, the term "Transfer" shall also include (i) if Tenant is a partnership or a limited liability company, the withdrawal or change, voluntary, involuntary or by operation of law, of fifty percent (50%) or more of the partners, officers or members, as applicable, or transfer of fifty percent (50%) or more of partnership, ownership or membership interests (as applicable), within a twelve (12)-month period, or the dissolution of the partnership or limited liability company without immediate reconstitution thereof, and (ii) if Tenant is a closely held corporation (i.e., whose stock is not publicly held and not traded through an exchange or over the counter), (A) the dissolution, merger, consolidation or other reorganization of Tenant or (B) the sale or other transfer of an aggregate of fifty percent (50%) or more of the voting shares of Tenant (other than to immediate family members by reason of gift or death, or in connection with a bona fide transaction intended to finance the continuing business and operations of the Tenant), within a twelve (12)-month period, or (C) the sale, mortgage, hypothecation or pledge of an aggregate of fifty percent (50%) or more of the value of the unencumbered assets of Tenant within a twelve (12)-month period.

14.8Deemed Consent Transfers.  Notwithstanding anything to the contrary contained in this Lease, an assignment or subletting of all or a portion of the Premises to (A) an affiliate of Tenant (an entity which is controlled by, controls, or is under common control with, Tenant as of the date of this Lease), or (B) an assignment of the Lease to an entity which acquires all or substantially all of the stock or assets of Tenant, shall not be deemed a Transfer requiring Landlord's consent under this Article 14, provided that (i) Tenant notifies Landlord of any such assignment or sublease and promptly supplies Landlord with any documents or information reasonably requested by Landlord regarding such transfer or transferee as set forth above,

(ii) such assignment or sublease is not a subterfuge by Tenant to avoid its obligations under this Lease, it being understood that such Transferee shall thereafter become liable under this Lease, on a joint and several basis, with Tenant, (iii) any transferee under this Section 14.8 shall be of a character and reputation consistent with the quality of the Building, and (iv) with respect to an assignment under sub-item (B), above, such assignee shall have a tangible net worth (not including goodwill as an asset) computed in accordance with generally accepted accounting principles ("Net Worth") at least equal to the greater of (1) the Net Worth of Original Tenant on the date of this Lease, and (2) the Net Worth of Tenant on the day immediately preceding the effective date of such assignment or sublease.  "Control," as used in this Section 14.8, shall mean the ownership, directly or indirectly, of at least fifty-one percent (51%) of the voting securities of, or possession of the right to vote, in the ordinary direction of its affairs, of at least fifty-one percent (51%) of the voting interest in, any person or entity. 

ARTICLE 15

SURRENDER OF PREMISES; OWNERSHIP AND
REMOVAL OF TRADE FIXTURES

15.1Surrender of Premises.  No act or thing done by Landlord or any agent or employee of Landlord during the Lease Term shall be deemed to constitute an acceptance by Landlord of a surrender of the Premises unless such intent is specifically acknowledged in writing by Landlord.  The delivery of keys to the Premises to Landlord or any agent or employee of Landlord shall not constitute a surrender of the Premises or effect a termination of this Lease, whether or not the keys are thereafter retained by Landlord, and notwithstanding such delivery Tenant shall be entitled to the return of such keys at any reasonable time upon request until this Lease shall have been properly terminated.  The voluntary or other surrender of this Lease by Tenant, whether accepted by Landlord or not, or a mutual termination hereof, shall not work a merger, and at the option of Landlord shall operate as an assignment to Landlord of all subleases or subtenancies affecting the Premises or terminate any or all such sublessees or subtenancies.

15.2Removal of Tenant Property by Tenant.  Upon the expiration of the Lease Term, or upon any earlier termination of this Lease, Tenant shall, subject to the provisions of this Article 15, quit and surrender possession of the Premises to Landlord in as good order and condition as when Tenant took possession and as thereafter improved by Landlord and/or Tenant, reasonable wear and tear and repairs which are specifically made the responsibility of Landlord hereunder excepted.  Upon such expiration or termination, Tenant shall, without expense to Landlord, remove or cause to be removed from the Premises all debris and rubbish, such items of furniture, equipment, business and trade fixtures, free-standing cabinet work, movable partitions and other articles of personal property owned by Tenant or installed or placed by Tenant at its expense in the Premises, and such similar articles of any other persons claiming under Tenant, as Landlord may, in its sole discretion, require to be removed, and Tenant shall repair at its own expense all damage to the Premises and Building resulting from such removal.

ARTICLE 16

HOLDING OVER

If Tenant holds over after the expiration of the Lease Term or earlier termination thereof, with the express or implied consent of Landlord, such tenancy shall be from month-to-month only, and shall not constitute a renewal hereof or an extension for any further term, and in such case Rent shall be payable at a monthly rate equal to (i) one hundred fifty percent (150%) of the Rent applicable during the last rental period of the Lease Term under this Lease for the first (1^st) month of such holdover, and (ii) two hundred percent (200%) thereafter.  Such month-to-month tenancy shall be subject to every other applicable term, covenant and agreement contained herein.  Nothing contained in this Article 16 shall be construed as consent by Landlord to any holding over by Tenant, and Landlord expressly reserves the right to require Tenant to surrender possession of the Premises to Landlord as provided in this Lease upon the expiration or other termination of this Lease.  The provisions of this Article 16 shall not be deemed to limit or constitute a waiver of any other rights or remedies of Landlord provided herein or at law.  If Tenant fails to surrender the Premises upon the termination or expiration of this Lease, in addition to any other liabilities to Landlord accruing therefrom, Tenant shall protect, defend, indemnify and hold Landlord harmless from all loss, costs (including reasonable attorneys' fees) and liability resulting from such failure, including, without limiting the generality of the foregoing, any claims made by any succeeding tenant founded upon such failure to surrender and any lost profits to Landlord resulting therefrom.

ARTICLE 17

ESTOPPEL CERTIFICATES

Within ten (10) business days following a request in writing by Landlord, Tenant shall execute, acknowledge and deliver to Landlord an estoppel certificate, which, as submitted by Landlord, shall be substantially in the form of Exhibit E, attached hereto (or such other form as may be required by any prospective mortgagee or purchaser of the Project, or any portion thereof), indicating therein any exceptions thereto that may exist at that time, and shall also contain any other information reasonably requested by Landlord or Landlord's mortgagee or prospective mortgagee.  Any such certificate may be relied upon by any prospective mortgagee or purchaser of all or any portion of the Project.  Tenant shall execute and deliver whatever other instruments may be reasonably required for such purposes.  At any time during the Lease Term, Landlord may require Tenant to provide Landlord with a current financial statement and financial statements of the two (2) years prior to the current financial statement year.  Such statements shall be prepared in accordance with generally accepted accounting principles and, if such is the normal practice of Tenant, shall be audited by an independent certified public accountant.  Failure of Tenant to timely execute, acknowledge and deliver such estoppel certificate or other instruments shall constitute an acceptance of the Premises and an acknowledgment by Tenant that statements included in the estoppel certificate are true and correct, without exception.  Notwithstanding the foregoing, in the event that (i) stock in the entity which constitutes Tenant under this Lease (as opposed to an entity that "controls" Tenant or is otherwise an "affiliate" of Tenant, as those terms are defined in Section 14.8 of this Lease) is publicly traded on a national stock exchange, and (ii) Tenant has it own, separate and distinct 10K and 10Q filing requirements (as opposed joint or cumulative filings with an entity that controls Tenant or with entities which are otherwise Affiliates of Tenant), then Tenant's obligation to provide Landlord with a copy of its most recent current financial statement shall be deemed satisfied.  

ARTICLE 18

MORTGAGE OR GROUND LEASE

18.1Subordination.  This Lease shall be subject and subordinate to all present and future ground or underlying leases of the Building or Project and to the lien of any mortgage, trust deed or other encumbrances now or hereafter in force against the Building or Project or any part thereof, if any, and to all renewals, extensions, modifications, consolidations and replacements thereof, and to all advances made or hereafter to be made upon the security of such mortgages or trust deeds, unless the holders of such mortgages, trust deeds or other encumbrances, or the lessors under such ground lease or underlying leases, require in writing that this Lease be superior thereto.  Tenant covenants and agrees in the event any proceedings are brought for the foreclosure of any such mortgage or deed in lieu thereof (or if any ground lease is terminated), to attorn, without any deductions or set-offs whatsoever, to the lienholder or purchaser or any successors thereto upon any such foreclosure sale or deed in lieu thereof (or to the ground lessor), if so requested to do so by such purchaser or lienholder or ground lessor, and to recognize such purchaser or lienholder or ground lessor as the lessor under this Lease, provided such lienholder or purchaser or ground lessor shall agree to accept this Lease and not disturb Tenant's occupancy, so long as Tenant timely pays the rent and observes and performs the terms, covenants and conditions of this Lease to be observed and performed by Tenant.  Landlord's interest herein may be assigned as security at any time to any lienholder.  Tenant shall, within five (5) days of request by Landlord, execute such further instruments or assurances as Landlord may reasonably deem necessary to evidence or confirm the subordination or superiority of this Lease to any such mortgages, trust deeds, ground leases or underlying leases.  Tenant waives the provisions of any current or future statute, rule or law which may give or purport to give Tenant any right or election to terminate or otherwise adversely affect this Lease and the obligations of the Tenant hereunder in the event of any foreclosure proceeding or sale.

18.2Notice to Lienholder or Ground Lessor.  Notwithstanding anything to the contrary contained in Article 28, below, or elsewhere in this Lease, upon receipt by Tenant of notice from any holder of a mortgage, trust deed or other encumbrance in force against the Building or the Project or any part thereof which includes the Premises or any lessor under a ground lease or underlying lease of the Building or the Project, or from Landlord, which notice sets forth the address of such lienholder or ground lessor, no notice from Tenant to Landlord shall be effective unless and until a copy of the same is given to such lienholder or ground lessor at the appropriate address therefor (as specified in the above-described notice or at such other places as may be designated from time to time in a notice to Tenant in accordance with Article 28, below), and the curing of any of Landlord's defaults by such lienholder or ground lessor within a reasonable period of time after such notice from Tenant (including a reasonable period of time to obtain possession of the Building or the Project, as the case may be, if such lienholder or ground lessor elects to do so) shall be treated as performance by Landlord.  For the purposes of this Article 18, the term "mortgage" shall include a mortgage on a leasehold interest of Landlord (but not a mortgage on Tenant's leasehold interest hereunder).

18.3Assignment of Rents.  With reference to any assignment by Landlord of Landlord’s interest in this Lease, or the Rent payable to Landlord hereunder, conditional in nature or otherwise, which assignment is made to any holder of a mortgage, trust deed or other

encumbrance in force against the Building or the Project or any part thereof which includes the Premises or to any lessor under a ground lease or underlying lease of the Building or the Project, Tenant agrees as follows: 

18.3.1The execution of any such assignment by Landlord, and the acceptance thereof by such lienholder or ground lessor, shall never be treated as an assumption by such lienholder or ground lessor of any of the obligations of Landlord under this Lease, unless such lienholder or ground lessor shall, by notice to Tenant, specifically otherwise elect.

18.3.2Notwithstanding delivery to Tenant of the notice required by Section 18.3.1, above, such lienholder or ground lessor, respectively, shall be treated as having assumed Landlord’s obligations under this Lease only upon such lienholder's foreclosure of any such mortgage, trust deed or other encumbrance, or acceptance of a deed in lieu thereof, and taking of possession of the Building or the Project or applicable portion thereof, or such ground lessor's termination of any such ground lease or underlying leases and assumption of Landlord's position hereunder, as the case may be.  In no event shall such lienholder, ground lessor or any other successor to Landlord's interest in this Lease, as the case may be, be liable for any security deposit paid by Tenant to Landlord, unless and until such lienholder, ground lessor or other such successor, respectively, actually has been credited with or has received for its own account as landlord the amount of such security deposit or any portion thereof (in which event the liability of such lienholder, ground lessor or other such successor, as the case may be, shall be limited to the amount actually credited or received).

18.3.3In no event shall the acquisition of title to the Building and the land upon which the Building is located or the Project or any part thereof which includes the Premises by a purchaser which, simultaneously therewith, leases back to the seller thereof the entire Building or the land upon which the Building is located or the Project or the entirety of that part thereof acquired by such purchaser, as the case may be, be treated as an assumption, by operation of law or otherwise, of Landlord’s obligations under this Lease, but Tenant shall look solely to such seller-lessee, or to the successors to or assigns of such seller-lessee's estate, for performance of Landlord’s obligations under this Lease.  In any such event, this Lease shall be subject and subordinate to the lease to such seller-lessee, and Tenant covenants and agrees in the event the lease to such seller-lessee is terminated to attorn, without any deductions or set-offs whatsoever, to such purchaser-lessor, if so requested to do so by such purchaser-lessor, and to recognize such purchaser-lessor as the lessor under this Lease, provided such purchaser-lessor shall agree to accept this Lease and not disturb Tenant's occupancy, so long as Tenant timely pays the rent and observes and performs the terms, covenants and conditions of this Lease to be observed and performed by Tenant.  For all purposes, such seller-lessee, or the successors to or assigns of such seller-lessee's estate, shall be the lessor under this Lease unless and until such seller-lessee's position shall have been assumed by such purchaser-lessor.

ARTICLE 19

DEFAULTS; REMEDIES

19.1Events of Default.  The occurrence of any of the following shall constitute a default of this Lease by Tenant:

19.1.1Any failure by Tenant to pay any Rent or any other charge required to be paid under this Lease, or any part thereof, when due; or 

19.1.2Except where a specific time period is otherwise set forth for Tenant's performance in this Lease, in which event the failure to perform by Tenant within such time period shall be a default by Tenant under this Section 19.1.2, any failure by Tenant to observe or perform any other provision, covenant or condition of this Lease to be observed or performed by Tenant where such failure continues for thirty (30) days after written notice thereof from Landlord to Tenant; provided that if the nature of such default is such that the same cannot reasonably be cured within a thirty (30) day period, Tenant shall not be deemed to be in default if it diligently commences such cure within such period and thereafter diligently proceeds to rectify and cure such default; or

19.1.3Abandonment or vacation of all or a substantial portion of the Premises by Tenant; or

19.1.4The failure by Tenant to observe or perform according to the provisions of Articles 5, 10, 14, 17 or 18 of this Lease, or any breach by Tenant of the representations and warranties set forth in Section 29.34 of this Lease, or the failure by Tenant to observe or perform any other provision, covenant or condition of this Lease which failure, because of the character of such provision, covenant or condition, would immediately jeopardize Landlord's interest, where such failure continues for more than two (2) business days after notice from Landlord; or

19.1.5Tenant's failure to occupy the Premises within thirty (30) business days after the Lease Commencement Date.

The notice periods provided in this Section 19.1 are in lieu of, and not in addition to, any notice periods provided by law.

19.2Remedies Upon Default.  Upon the occurrence of any event of default by Tenant, Landlord shall have, in addition to any other remedies available to Landlord at law or in equity (all of which remedies shall be distinct, separate and cumulative), the option to pursue any one or more of the following remedies, each and all of which shall be cumulative and nonexclusive, without any notice or demand whatsoever.

19.2.1Terminate this Lease, in which event Tenant shall immediately surrender the Premises to Landlord, and if Tenant fails to do so, Landlord may, without prejudice to any other remedy which it may have for possession or arrearages in rent, enter upon and take possession of the Premises and expel or remove Tenant and any other person who may be occupying the Premises or any part thereof, without being liable for prosecution or any claim or damages therefor; and Landlord may recover from Tenant the following:

(i)The worth at the time of award of any unpaid rent which has been earned at the time of such termination; plus

(ii)The worth at the time of award of the amount by which the unpaid rent which would have been earned after termination until the time of award exceeds the amount of such rental loss that Tenant proves could have been reasonably avoided; plus

(iii)The worth at the time of award of the amount by which the unpaid rent for the balance of the Lease Term after the time of award exceeds the amount of such rental loss that Tenant proves could have been reasonably avoided; plus 

(iv)Any other amount necessary to compensate Landlord for all the detriment proximately caused by Tenant's failure to perform its obligations under this Lease or which in the ordinary course of things would be likely to result therefrom, specifically including but not limited to, brokerage commissions and advertising expenses incurred, expenses of remodeling the Premises or any portion thereof for a new tenant, whether for the same or a different use, and any special concessions made to obtain a new tenant; and

(v)At Landlord's election, such other amounts in addition to or in lieu of the foregoing as may be permitted from time to time by applicable law.

The term "rent" as used in this Section 19.2 shall be deemed to be and to mean all sums of every nature required to be paid by Tenant pursuant to the terms of this Lease, whether to Landlord or to others.  As used in Sections 19.2.1(i) and 19.2.1(ii), above, the "worth at the time of award" shall be computed by allowing interest at the rate set forth in Article 25 of this Lease, but in no case greater than the maximum amount of such interest permitted by law.  As used in Section 19.2.1(iii) above, the "worth at the time of award" shall be computed by discounting such amount at the discount rate of the Federal Reserve Bank of San Francisco at the time of award plus one percent (1%).

19.2.2Landlord shall have the remedy described in California Civil Code Section 1951.4 (lessor may continue lease in effect after lessee's breach and abandonment and recover rent as it becomes due, if lessee has the right to sublet or assign, subject only to reasonable limitations).  Accordingly, if Landlord does not elect to terminate this Lease on account of any default by Tenant, Landlord may, from time to time, without terminating this Lease, enforce all of its rights and remedies under this Lease, including the right to recover all rent as it becomes due.

19.2.3Landlord shall at all times have the rights and remedies (which shall be cumulative with each other and cumulative and in addition to those rights and remedies available under Sections 19.2.1 and 19.2.2, above, or any law or other provision of this Lease), without prior demand or notice except as required by applicable law, to seek any declaratory, injunctive or other equitable relief, and specifically enforce this Lease, or restrain or enjoin a violation or breach of any provision hereof.

19.3Subleases of Tenant.  If Landlord elects to terminate this Lease on account of any default by Tenant, as set forth in this Article 19, then Landlord shall have the right, at Landlord's option in its sole discretion, (i) to terminate any and all assignments, subleases, licenses, concessions or other consensual arrangements for possession entered into by Tenant and affecting the Premises, in which event Landlord shall have the right to repossess such affected portions of the Premises by any lawful means, or (ii) to succeed to Tenant's interest in any or all such assignments, subleases, licenses, concessions or arrangements, in which event Landlord may require any assignees, sublessees, licensees or other parties thereunder to attorn to and recognize Landlord as its assignor, sublessor, licensor, concessionaire or transferor

thereunder.  In the event of Landlord's election to succeed to Tenant's interest in any such assignments, subleases, licenses, concessions or arrangements, Tenant shall, as of the date of notice by Landlord of such election, have no further right to or interest in the rent or other consideration receivable thereunder. 

19.4Efforts to Relet.  No re-entry or repossession, repairs, maintenance, changes, alterations and additions, reletting, appointment of a receiver to protect Landlord's interests hereunder, or any other action or omission by Landlord shall be construed as an election by Landlord to terminate this Lease or Tenant's right to possession, or to accept a surrender of the Premises, nor shall same operate to release Tenant in whole or in part from any of Tenant's obligations hereunder, unless express written notice of such intention is sent by Landlord to Tenant.  Tenant hereby irrevocably waives any right otherwise available under any law to redeem or reinstate this Lease.

ARTICLE 20

COVENANT OF QUIET ENJOYMENT

Landlord covenants that Tenant, on paying the Rent, charges for services and other payments herein reserved and on keeping, observing and performing all the other terms, covenants, conditions, provisions and agreements herein contained on the part of Tenant to be kept, observed and performed, shall, during the Lease Term, peaceably and quietly have, hold and enjoy the Premises subject to the terms, covenants, conditions, provisions and agreements hereof without interference by any persons lawfully claiming by or through Landlord.  The foregoing covenant is in lieu of any other covenant express or implied.

ARTICLE 21

LETTER OF CREDIT

21.1Delivery of Letter of Credit.  Tenant shall deliver to Landlord concurrent with Tenant's execution of this Lease, as protection for the full and faithful performance by Tenant of all of its obligations under this Lease and for all losses and damages Landlord may suffer (or which Landlord reasonably estimates that it may suffer) as a result of any breach or default by Tenant under this Lease, an unconditional, clean, irrevocable negotiable standby letter of credit (the "L-C") in the amount set forth in Section 8 of the Summary (the "L-C Amount"), in the form attached hereto as Exhibit H, payable in the City of San Francisco, California, running in favor of Landlord, drawn on a bank (the "Bank") reasonably approved by Landlord and at a minimum having a long term issuer credit rating from Standard and Poor’s Professional Rating Service of A or a comparable rating from Moody’s Professional Rating Service (the "Credit Rating Threshold"), and otherwise conforming in all respects to the requirements of this Article 21, including, without limitation, all of the requirements of Section 21.2 below, all as set forth more particularly hereinbelow.  Tenant shall pay all expenses, points and/or fees incurred by Tenant in obtaining and maintaining the L/C.  In the event of an assignment by Tenant of its interest in the Lease (and irrespective of whether Landlord's consent is required for such assignment), the acceptance of any replacement or substitute letter of credit by Landlord from the assignee shall be subject to Landlord's prior written approval, in Landlord's reasonable

discretion, and the attorney's fees incurred by Landlord in connection with such determination shall be payable by Tenant to Landlord within ten (10) days of billing. 

21.2In General.  The L-C shall be "callable" at sight, permit partial draws and multiple presentations and drawings, and be otherwise subject to the Uniform Customs and Practices for Documentary Credits (1993-Rev), International Chamber of Commerce Publication #500, or the International Standby Practices-ISP 98, International Chamber of Commerce Publication #590.  Tenant further covenants and warrants as follows:

21.2.1Landlord Right to Transfer.  The L-C shall provide that Landlord, its successors and assigns, may, at any time and without notice to Tenant and without first obtaining Tenant's consent thereto, transfer (one or more times) all or any portion of its interest in and to the L-C to another party, person or entity, regardless of whether or not such transfer is separate from or as a part of the assignment by Landlord of its rights and interests in and to this Lease.  In the event of a transfer of Landlord's interest in the Building, Landlord shall transfer the L-C, in whole or in part, to the transferee and thereupon Landlord shall, without any further agreement between the parties, be released by Tenant from all liability therefor, and it is agreed that the provisions hereof shall apply to every transfer or assignment of the whole or any portion of said L-C to a new landlord.  In connection with any such transfer of the L-C by Landlord, Tenant shall, at Tenant's sole cost and expense, execute and submit to the Bank such applications, documents and instruments as may be necessary to effectuate such transfer, and Tenant shall be responsible for paying the Bank's transfer and processing fees in connection therewith.

21.2.2No Assignment by Tenant.   Tenant shall neither assign nor encumber the L-C or any part thereof.  Neither Landlord nor its successors or assigns will be bound by any assignment, encumbrance, attempted assignment or attempted encumbrance by Tenant in violation of this Section.

21.2.3Replenishment.  If, as a result of any drawing by Landlord on the L-C pursuant to its rights set forth in Section 21.3 below, the amount of the L-C shall be less than the L-C Amount, Tenant shall, within five (5) days thereafter, provide Landlord with (i) an amendment to the L-C restoring such L-C to the L-C Amount or (ii) additional L-Cs in an amount equal to the deficiency, which additional L-Cs shall comply with all of the provisions of this Article 21, and if Tenant fails to comply with the foregoing, notwithstanding anything to the contrary contained in Section 19.1 above, the same shall constitute an incurable default by Tenant under this Lease (without the need for any additional notice and/or cure period).  

21.2.4Renewal; Replacement.  If the L-C expires earlier than the date (the "LC Expiration Date") that is one hundred twenty (120) days after the expiration of the Lease Term, Tenant shall deliver a new L-C or certificate of renewal or extension to Landlord at least sixty (60) days prior to the expiration of the L-C then held by Landlord, without any action whatsoever on the part of Landlord, which new L-C shall be irrevocable and automatically renewable through the LC Expiration Date upon the same terms as the expiring L-C or such other terms as may be acceptable to Landlord in its sole discretion.  In furtherance of the foregoing, Landlord and Tenant agree that the L-C shall contain a so-called "evergreen provision," whereby the L-C will automatically be renewed unless at least sixty (60) days’ prior written notice of non-renewal is provided by the issuer to Landlord; provided, however, that the

final expiration date identified in the L-C, beyond which the L-C shall not automatically renew, shall not be earlier than the LC Expiration Date. 

21.2.5Bank’s Financial Condition.  If, at any time during the Lease Term, the Bank’s long term credit rating is reduced below the Credit Rating Threshold, or if the financial condition of the Bank changes in any other materially adverse way (either, a "Bank Credit Threat"), then Landlord shall have the right to require that Tenant obtain from a different issuer a substitute L-C that complies in all respects with the requirements of this Article 21, and Tenant’s failure to obtain such substitute L-C within ten (10) days following Landlord’s written demand therefor (with no other notice or cure or grace period being applicable thereto, notwithstanding anything in this Lease to the contrary) shall entitle Landlord, or Landlord’s then managing agent, to immediately draw upon the then existing L-C in whole or in part, without notice to Tenant, as more specifically described in Section 21.3 below.  Tenant shall be responsible for the payment of any and all costs incurred with the review of any replacement L-C (including without limitation Landlord’s reasonable attorneys’ fees), which replacement is required pursuant to this Section or is otherwise requested by Tenant.  

21.3Application of Letter of Credit.  Tenant hereby acknowledges and agrees that Landlord is entering into this Lease in material reliance upon the ability of Landlord to draw upon the L-C as protection for the full and faithful performance by Tenant of all of its obligations under this Lease and for all losses and damages Landlord may suffer (or which Landlord reasonably estimates that it may suffer) as a result of any breach or default by Tenant under this Lease.  Landlord, or its then managing agent, shall have the right to draw down an amount up to the face amount of the L-C if any of the following shall have occurred or be applicable:  (A) such amount is due to Landlord under the terms and conditions of this Lease, or (B) Tenant has filed a voluntary petition under the U. S. Bankruptcy Code or any state bankruptcy code (collectively, "Bankruptcy Code"), or (C) an involuntary petition has been filed against Tenant under the Bankruptcy Code, or (D) the Bank has notified Landlord that the L-C will not be renewed or extended through the LC Expiration Date, or (E) a Bank Credit Threat or Receivership (as such term is defined in Section 21.6.1 below) has occurred and Tenant has failed to comply with the requirements of either Section 21.2.5 above or 21.6 below, as applicable.  If Tenant shall breach any provision of this Lease or otherwise be in default hereunder, or if any of the foregoing events identified in Sections 21.3(B) through (E) shall have occurred, Landlord may, but without obligation to do so, and without notice to Tenant, draw upon the L-C, in part or in whole, and the proceeds may be applied by Landlord (i) to cure any breach or default of Tenant and/or to compensate Landlord for any and all damages of any kind or nature sustained or which Landlord reasonably estimates that it will sustain resulting from Tenant's breach or default, (ii) against any Rent payable by Tenant under this Lease that is not paid when due and/or (iii) to pay for all losses and damages that Landlord has suffered or that Landlord reasonably estimates that it will suffer as a result of any breach or default by Tenant under this Lease.  The use, application or retention of the L-C, or any portion thereof, by Landlord shall not prevent Landlord from exercising any other right or remedy provided by this Lease or by any applicable law, it being intended that Landlord shall not first be required to proceed against the L-C, and shall not operate as a limitation on any recovery to which Landlord may otherwise be entitled.  Tenant agrees not to interfere in any way with payment to Landlord of the proceeds of the L-C, either prior to or following a "draw" by Landlord of any portion of the L-C, regardless of whether any dispute exists between Tenant and Landlord as to Landlord's

right to draw upon the L-C.  No condition or term of this Lease shall be deemed to render the L-C conditional to justify the issuer of the L-C in failing to honor a drawing upon such L-C in a timely manner.  Tenant agrees and acknowledges that (i) the L-C constitutes a separate and independent contract between Landlord and the Bank, (ii) Tenant is not a third party beneficiary of such contract, (iii) Tenant has no property interest whatsoever in the L-C or the proceeds thereof, and (iv) in the event Tenant becomes a debtor under any chapter of the Bankruptcy Code, neither Tenant, any trustee, nor Tenant's bankruptcy estate shall have any right to restrict or limit Landlord's claim and/or rights to the L-C and/or the proceeds thereof by application of Section 502(b)(6) of the U. S. Bankruptcy Code or otherwise. 

21.4Letter of Credit not a Security Deposit.  Landlord and Tenant acknowledge and agree that in no event or circumstance shall the L-C or any renewal thereof or any proceeds thereof be (i) deemed to be or treated as a "security deposit" within the meaning of California Civil Code Section 1950.7, (ii) subject to the terms of such Section 1950.7, or (iii) intended to serve as a "security deposit" within the meaning of such Section 1950.7.  The parties hereto (A) recite that the L-C is not intended to serve as a security deposit and such Section 1950.7 and any and all other laws, rules and regulations applicable to security deposits in the commercial context ("Security Deposit Laws") shall have no applicability or relevancy thereto and (B) waive any and all rights, duties and obligations either party may now or, in the future, will have relating to or arising from the Security Deposit Laws.

21.5Proceeds of Draw.  In the event Landlord draws down on the L-C pursuant to Section 21.3(D) or (E) above, the proceeds of the L-C may be held by Landlord and applied by Landlord against any Rent payable by Tenant under this Lease that is not paid when due and/or to pay for all losses and damages that Landlord has suffered or that Landlord reasonably estimates that it will suffer as a result of any breach or default by Tenant under this Lease.  Any unused proceeds shall constitute the property of Landlord and need not be segregated from Landlord's other assets.  Tenant hereby (i) agrees that (A) Tenant has no property interest whatsoever in the proceeds from any such draw, and (B) such proceeds shall not be deemed to be or treated as a "security deposit" under the Security Deposit Law, and (ii) waives all rights, duties and obligations either party may now or, in the future, will have relating to or arising from the Security Deposit Laws.  Landlord agrees that the amount of any proceeds of the L-C received by Landlord, and not (a) applied against any Rent payable by Tenant under this Lease that was not paid when due or (b) used to pay for any losses and/or damages suffered by Landlord (or reasonably estimated by Landlord that it will suffer) as a result of any breach or default by Tenant under this Lease (the "Unused L-C Proceeds"), shall be paid by Landlord to Tenant (x) upon receipt by Landlord of a replacement L-C in the full L-C Amount, which replacement L-C shall comply in all respects with the requirements of this Article 21, or (y) within thirty (30) days after the LC Expiration Date; provided, however, that if prior to the LC Expiration Date a voluntary petition is filed by Tenant, or an involuntary petition is filed against Tenant by any of Tenant's creditors, under the Bankruptcy Code, then Landlord shall not be obligated to make such payment in the amount of the Unused L-C Proceeds until either all preference issues relating to payments under this Lease have been resolved in such bankruptcy or reorganization case or such bankruptcy or reorganization case has been dismissed.

21.6Bank Placed Into Receivership.   

21.6.1Bank Placed Into Receivership.  In the event the Bank is placed into receivership or conservatorship (any such event, a "Receivership") by the Federal Deposit Insurance Corporation or any successor or similar entity (the "FDIC"), then, effective as of the date such Receivership occurs, the L-C shall be deemed to not meet the requirements of this Article 21, and, within ten (10) days following Landlord's notice to Tenant of such Receivership (the "LC Replacement Notice"), Tenant shall (i) replace the L-C with a substitute L-C from a different issuer reasonably acceptable to Landlord and that complies in all respects with the requirements of this Article 21 or (ii), in the event Tenant demonstrates to Landlord that Tenant is reasonably unable to obtain a substitute L-C from a different issuer reasonably acceptable to Landlord and that complies in all respects with the requirements of this Article 21 within the foregoing ten (10) day period, deposit with Landlord cash in the L-C Amount (the "Interim Cash Deposit"); provided, however, that, in the case of the foregoing sub-clause (ii), Tenant shall, within sixty (60) days after the LC Replacement Notice, replace the L-C with a substitute L-C from a different issuer reasonably acceptable to Landlord and that complies in all respects with the requirements of this Article 21, and upon Landlord’s receipt and acceptance of such replacement L-C, Landlord shall return to Tenant the Interim Cash Deposit, with no obligation on the part of Landlord to pay any interest thereon.  If Tenant fails to comply in any respect with the requirements of this Section 21.6.1, then, notwithstanding anything in this Lease to the contrary, Landlord shall have the right to (a) declare Tenant in default of this Lease for which there shall be no notice or grace or cure periods being applicable thereto other than the aforesaid ten (10) day and sixty (60) day periods, (b) if applicable, retain such Interim Cash Deposit until such time as such default is cured by Tenant, which retention shall not constitute a waiver of any right or remedy available to Landlord under the terms of this Lease or at law, and (c) pursue any and all remedies available to it under this Lease and at law, including, without limitation, if Tenant has failed to provide the Interim Cash Deposit, treating any Receivership as a Bank Credit Threat and exercising Landlord’s remedies under Section 21.2.5 above, to the extent possible pursuant to then existing FDIC policy.  Tenant shall be responsible for the payment of any and all costs incurred with the review of any replacement L-C (including without limitation Landlord’s reasonable attorneys’ fees), which replacement is required pursuant to this Section or is otherwise requested by Tenant.  

21.6.2Interim Cash Deposit.  During any period that Landlord remains in possession of the Interim Cash Deposit (any such period, a "Deposit Period"), it is understood by the parties that such Interim Cash Deposit shall be held by Landlord as security for the full and faithful performance of Tenant’s covenants and obligations under this Lease.  The Interim Cash Deposit shall not constitute an advance of any Rent, an advance payment of any other kind, nor a measure of Landlord’s damages in case of Tenant’s default.  If, during any such Deposit Period, Tenant defaults with respect to any provisions of this Lease, including, but not limited to, the provisions relating to the payment of Rent, the removal of property and the repair of resultant damage, then Landlord may but shall not be required to, from time to time, without notice to Tenant and without waiving any other remedy available to Landlord, use the Interim Cash Deposit, or any portion of it, to the extent necessary to cure or remedy such default or failure or to compensate Landlord for all damages sustained by Landlord or which Landlord reasonably estimates that it will sustain resulting from Tenant’s default or failure to comply fully and timely with its obligations pursuant to this Lease.  Tenant shall immediately pay to Landlord on demand

any amount so applied in order to restore the Interim Cash Deposit to its original amount, and Tenant’s failure to immediately do so shall constitute a default under this Lease.  In the event Landlord is in possession of the Interim Cash Deposit at the expiration or earlier termination of this Lease, and Tenant is in compliance with the covenants and obligations set forth in this Lease at the time of such expiration or termination, then Landlord shall return to Tenant the Interim Cash Deposit, less any amounts deducted by Landlord to reimburse Landlord for any sums to which Landlord is entitled under the terms of this Lease, within sixty (60) days following both such expiration or termination and Tenant’s vacation and surrender of the Premises.  Landlord’s obligations with respect to the Interim Cash Deposit are those of a debtor and not a trustee.  Landlord shall not be required to maintain the Interim Cash Deposit separate and apart from Landlord’s general or other funds, and Landlord may commingle the Interim Cash Deposit with any of Landlord’s general or other funds.  Tenant shall not at any time be entitled to interest on the Interim Cash Deposit.  In the event of a transfer of Landlord's interest in the Building, Landlord shall transfer the Interim Cash Deposit, in whole or in part, to the transferee and thereupon Landlord shall, without any further agreement between the parties, be released by Tenant from all liability therefor, and it is agreed that the provisions hereof shall apply to every transfer or assignment of the whole or any portion of said Interim Cash Deposit to a new landlord.  Tenant hereby waives the provisions of Section 1950.7 of the California Civil Code, or any successor statute. 

21.7Reduction of L‑C Amount.  Provided that, as of the last day of the thirtieth (30^th) full calendar month of the Lease Term (the "Reduction Date"), (i) Tenant is not then in breach of or in default under this Lease, (ii) Tenant has not previously been in breach of or in default under this Lease beyond any applicable notice and cure period, and (iii) on or prior to the Reduction Date, Tenant tenders to Landlord a replacement Letter of Credit or a certificate of amendment to the existing Letter of Credit, conforming in all respects to the requirements of this Article 21, then the L-C Amount shall be reduced to $145,750.17.  In the event the L-C Amount is reduced pursuant to the foregoing, and provided that Tenant timely tenders the replacement or amended Letter of Credit to Landlord in the form required herein, Landlord shall exchange the Letter of Credit then held by Landlord for the replacement or amended Letter of Credit tendered by Tenant.

ARTICLE 22

INTENTIONALLY OMITTED

ARTICLE 23

SIGNS

23.1Full Floors.  Subject to Landlord's prior written approval, in its sole discretion, and provided all signs are in keeping with the quality, design and style of the Building and Project, Tenant, if the Premises comprise an entire floor of the Building, at its sole cost and expense, may install identification signage anywhere in the Premises including in the elevator

lobby of the Premises, provided that such signs must not be visible from the exterior of the Building. 

23.2Multi-Tenant Floors.  If other tenants occupy space on the floor on which the Premises is located, Tenant's identifying signage (including lobby directory signage on the floor of the Building upon which the Premises is located) shall be provided by Landlord, at Tenant's cost, and such signage shall be comparable to that used by Landlord for other similar floors in the Building and shall comply with Landlord's then-current Building standard signage program.

23.3Prohibited Signage and Other Items.  Any signs, notices, logos, pictures, names or advertisements which are installed outside of the Premises (or which can be seen from the exterior of the Premises) and that have not been separately approved by Landlord may be removed without notice by Landlord at the sole expense of Tenant.  Tenant may not install any signs on the exterior or roof of the Project or the Common Areas.  Any signs, window coverings, or blinds (even if the same are located behind the Landlord-approved window coverings for the Building), or other items visible from the exterior of the Premises or Building, shall be subject to the prior approval of Landlord, in its sole discretion.

23.4Building Directory.  Tenant shall have the right, at Tenant cost, to have Tenant's name entered into Landlord's directory in the lobby of the Building.

23.5Monument Signage.  Subject to the terms of this Section 23.5, Applicable Laws and all applicable Building rules and regulations, the Original Tenant shall have the non-exclusive right to have a sign ("Tenant's Sign") on one (1) tenant strip of the monument sign located front of the Building (the "Monument").  The location of Tenant's Sign on the Monument shall be designated by Landlord.  Tenant's right to Tenant's Sign shall be subject to all applicable governmental laws, rules, regulations, codes and approvals.  Further, Tenant shall be responsible for obtaining any applicable permits or other governmental approval(s) applicable to or required for Tenant’s Sign.  Subject to the terms hereof, the content, size, design, location, graphics, materials, colors and other specifications of the Tenant's Sign shall be subject to the approval of Landlord, which approval shall not be unreasonably withheld.  Tenant shall be responsible for all costs and expenses incurred in connection with the design, construction, installation, repair, operation (including utilities costs, if applicable), maintenance, compliance with laws, and removal of the Tenant's Sign.  Tenant's signage rights set forth in this Section 23.5 shall be personal to the Original Tenant, and may not be assigned to any assignee or to any sublessee or any other person or entity.  Landlord shall have the right to terminate Tenant's right to maintain Tenant's Sign in the event that Tenant shall be in default of this Lease after the expiration of any applicable cure period.  In addition, Tenant's signage rights set forth in this Section 23.5 shall terminate at any time during the Lease Term during which the Original Tenant fails to physically occupy the entire Premises.  Upon the expiration of the Lease Term or the earlier termination of Tenant's signage rights under this Section 23.5, Tenant shall, at Tenant's sole cost and expense, remove the Tenant's Sign and repair any and all damage caused by such removal and restore all affected areas to their original condition.

ARTICLE 24

COMPLIANCE WITH LAW

Tenant shall not do anything or suffer anything to be done in or about the Premises or the Project which will in any way conflict with any law, statute, ordinance or other governmental rule, regulation or requirement now in force or which may hereafter be enacted or promulgated, including any such governmental regulations related to disabled access (collectively, "Applicable Laws").  At its sole cost and expense, Tenant shall promptly comply with any Applicable Laws which relate to (i) Tenant's use of the Premises, (ii) any Alterations made by Tenant to the Premises, and any Tenant Improvements in the Premises, or (iii) the Base Building, but as to the Base Building, only to the extent such obligations are triggered by Alterations made by Tenant to the Premises to the extent such Alterations are not normal and customary business office improvements, or triggered by the Tenant Improvements to the extent such Tenant Improvements are not normal and customary business office improvements, or triggered by Tenant's use of the Premises for non‑general office use.  Should any standard or regulation now or hereafter be imposed on Landlord or Tenant by a state, federal or local governmental body charged with the establishment, regulation and enforcement of occupational, health or safety standards for employers, employees, landlords or tenants, then Tenant agrees, at its sole cost and expense, to comply promptly with such standards or regulations and to cooperate with Landlord, including, without limitation, by taking such actions as Landlord may reasonably require, in Landlord's efforts to comply with such standards or regulations.  Tenant shall be responsible, at its sole cost and expense, to make all alterations to the Premises as are required to comply with the governmental rules, regulations, requirements or standards described in this Article 24.  The judgment of any court of competent jurisdiction or the admission of Tenant in any judicial action, regardless of whether Landlord is a party thereto, that Tenant has violated any of said governmental measures, shall be conclusive of that fact as between Landlord and Tenant.  Tenant shall promptly pay all fines, penalties and damages that may arise out of or be imposed because of its failure to comply with the provisions of this Article 24.  Landlord shall comply with all Applicable Laws relating to the Base Building, provided that compliance with such Applicable Laws is not the responsibility of Tenant under this Lease, and provided further that Landlord's failure to comply therewith would prohibit Tenant from obtaining or maintaining a certificate of occupancy for the Premises, or would unreasonably and materially affect the safety of Tenant's employees or create a significant health hazard for Tenant's employees, or would otherwise materially and adversely affect Tenant's use of or access to the Premises.  Landlord shall be permitted to include in Operating Expenses any costs or expenses incurred by Landlord under this Article 24 to the extent not prohibited by the terms of Article 4 of this Lease, above.  Tenant hereby agrees to use reasonable efforts to notify Landlord if Tenant makes any Alterations or improvements to the Premises that might impact accessibility to the Premises or Building under any disability access laws.  Landlord hereby agrees to use reasonable efforts to notify Tenant if Landlord makes any alterations or improvements to the Premises that might impact accessibility to the Premises or Building under any disability access laws.  

ARTICLE 25

LATE CHARGES

If any installment of Rent or any other sum due from Tenant shall not be received by Landlord or Landlord's designee upon the date said amount is due, then Tenant shall pay to Landlord a late charge equal to six percent (6%) of the overdue amount plus any reasonable attorneys' fees incurred by Landlord by reason of Tenant's failure to pay Rent and/or other charges when due hereunder.  The late charge shall be deemed Additional Rent and the right to require it shall be in addition to all of Landlord's other rights and remedies hereunder or at law and shall not be construed as liquidated damages or as limiting Landlord's remedies in any manner.  In addition to the late charge described above, any Rent or other amounts owing hereunder which are not paid upon the date they are due, shall bear interest from the date when due until paid at a rate per annum equal to the lesser of (x) the annual "Bank Prime Loan" rate cited in the Federal Reserve Statistical Release Publication H.15(519), published weekly (or such other comparable index as Landlord and Tenant shall reasonably agree upon if such rate ceases to be published) plus four (4) percentage points, and (v) the highest rate permitted by applicable law.

ARTICLE 26

LANDLORD'S RIGHT TO CURE DEFAULT; PAYMENTS BY TENANT

26.1Landlord's Cure.  All covenants and agreements to be kept or performed by Tenant under this Lease shall be performed by Tenant at Tenant's sole cost and expense and without any reduction of Rent, except to the extent, if any, otherwise expressly provided herein.  If Tenant shall fail to perform any obligation under this Lease, and such failure shall continue in excess of the time allowed under Section 19.1.2, above, unless a specific time period is otherwise stated in this Lease, Landlord may, but shall not be obligated to, make any such payment or perform any such act on Tenant's part without waiving its rights based upon any default of Tenant and without releasing Tenant from any obligations hereunder.

26.2Tenant's Reimbursement.  Except as may be specifically provided to the contrary in this Lease, Tenant shall pay to Landlord the following sums (which sums shall bear interest from the date accrued by Landlord until paid by Tenant at a rate per annum equal to interest at the rate set forth in Article 25 of this Lease, but in no case greater than the maximum amount of such interest permitted by law), upon delivery by Landlord to Tenant of statements therefor:  (i) sums equal to expenditures reasonably made and obligations incurred by Landlord in connection with the remedying by Landlord of Tenant's defaults pursuant to the provisions of Section 26.1; (ii) sums equal to all losses, costs, liabilities, damages and expenses referred to in Article 10 of this Lease; and (iii) sums equal to all reasonable expenditures made and obligations incurred by Landlord in collecting or attempting to collect the Rent or in enforcing or attempting to enforce any rights of Landlord under this Lease or pursuant to law, including, without limitation, all legal fees and other amounts so expended.  Tenant's obligations under this Section 26.2 shall survive the expiration or sooner termination of the Lease Term.

ARTICLE 27

ENTRY BY LANDLORD

Landlord reserves the right at all reasonable times and upon reasonable advance notice to Tenant (which notice, notwithstanding anything to the contrary contained in Article 28 of this Lease, may be oral, and which notice shall not be required in the case of an emergency) to enter the Premises to (i) inspect them; (ii) show the Premises to prospective purchasers or tenants, or to current or prospective mortgagees, ground or underlying lessors or insurers; (iii) post notices of nonresponsibility; or (iv) alter, improve or repair the Premises or the Building, or for structural alterations, repairs or improvements to the Building or the Building's systems and equipment.  Notwithstanding anything to the contrary contained in this Article 27, upon reasonable advance notice to Tenant (except with regard to janitorial service and except for sub-item (B), below, and which notice, notwithstanding anything to the contrary contained in Article 28 of this Lease, may be oral, and which notice shall not be required in the case of an emergency), Landlord may enter the Premises at any time to (A) perform services required of Landlord, including janitorial service; (B) take possession due to any breach of this Lease in the manner provided herein; and (C) perform any covenants of Tenant which Tenant fails to perform.  Landlord shall use commercially reasonable efforts to minimize interference with the conduct of Tenant's business in connection with such entries into the Premises.  Landlord may make any such entries without the abatement of Rent and may take such reasonable steps as required to accomplish the stated purposes.  Tenant hereby waives any claims for damages or for any injuries or inconvenience to or interference with Tenant's business, lost profits, any loss of occupancy or quiet enjoyment of the Premises, and any other loss occasioned thereby, provided that the foregoing shall not limit Landlord's liability, if any, pursuant to Applicable Law for personal injury and property damage to the extent caused by the gross negligence or willful misconduct of Landlord, its agents, employees or contractors.  For each of the above purposes, Landlord shall at all times have a key with which to unlock all the doors in the Premises, excluding Tenant's vaults, safes and special security areas designated in advance by Tenant.  In an emergency, Landlord shall have the right to use any means that Landlord may deem proper to open the doors in and to the Premises.  Any entry into the Premises by Landlord in the manner hereinbefore described shall not be deemed to be a forcible or unlawful entry into, or a detainer of, the Premises, or an actual or constructive eviction of Tenant from any portion of the Premises.  No provision of this Lease shall be construed as obligating Landlord to perform any repairs, alterations or decorations except as otherwise expressly agreed to be performed by Landlord herein.

ARTICLE 28

NOTICES

All notices, demands, designations, approvals or other communications (collectively, "Notices") given or required to be given by either party to the other hereunder or by law shall be in writing, shall be (A) sent by United States certified or registered mail, postage prepaid, return receipt requested ("Mail"), (B) delivered by a nationally recognized overnight courier, or (C) delivered personally.  Any Notice shall be sent, transmitted, or delivered, as the case may be, to Tenant at the appropriate address set forth in Section 9 of the Summary, or to such other place as Tenant may from time to time designate in a Notice to Landlord, or to Landlord at the addresses set forth below, or to such other places as Landlord may from time to time designate in a Notice to Tenant.  Any Notice will be deemed given (i) three (3) days after the date it is posted if sent by Mail, (ii) the date the overnight courier delivery is made, or (iii) the date personal delivery is

made.  Any Notice given by an attorney on behalf of Landlord or by Landlord’s managing agent shall be considered as given by Landlord and shall be fully effective as long as such notice otherwise meets the delivery requirements of this Article 28.  As of the date of this Lease, any Notices to Landlord must be sent, transmitted, or delivered, as the case may be, to the following addresses:

Boston Properties Limited Partnership
Four Embarcadero Center
Lobby Level, Suite One
San Francisco, California 94111
Attention:  Mr. Bob Pester

and

Boston Properties, Inc.

Prudential Center Tower

800 Boylston Street, Suite 1900

Boston, Massachusetts 02199

Attention:  General Counsel

Boston Properties Limited Partnership

Four Embarcadero Center

Lobby Level, Suite One

San Francisco, California  94111

Attention:  Regional Counsel

and

Allen Matkins Leck Gamble Mallory & Natsis LLP
1901 Avenue of the Stars, Suite 1800
Los Angeles, California 90067
Attention:  Anton N. Natsis, Esq.

ARTICLE 29

MISCELLANEOUS PROVISIONS

29.1Terms; Captions.  The words "Landlord" and "Tenant" as used herein shall include the plural as well as the singular.  The necessary grammatical changes required to make the provisions hereof apply either to corporations or partnerships or individuals, men or women, as the case may require, shall in all cases be assumed as though in each case fully expressed.  The captions of Articles and Sections are for convenience only and shall not be deemed to limit, construe, affect or alter the meaning of such Articles and Sections.

29.2Binding Effect.  Subject to all other provisions of this Lease, each of the covenants, conditions and provisions of this Lease shall extend to and shall, as the case may require, bind or inure to the benefit not only of Landlord and of Tenant, but also of their

respective heirs, personal representatives, successors or assigns, provided this clause shall not permit any assignment by Tenant contrary to the provisions of Article 14 of this Lease. 

29.3No Light, Air or View Rights.  No rights to any view or to light or air over any property, whether belonging to Landlord or any other person, are granted to Tenant by this Lease.  Under no circumstances whatsoever at any time during the Lease Term shall any temporary darkening of any windows of the Premises or any temporary obstruction of the light or view therefrom by reason of any repairs, improvements, maintenance or cleaning in or about the Project, or any diminution, impairment or obstruction (whether partial or total) of light, air or view by any structure which may be erected on any land comprising a part of, or located adjacent to or otherwise in the path of light, air or view to, the Project, in any way impose any liability upon Landlord or in any way reduce or diminish Tenant's obligations under this Lease.

29.4Modification of Lease.  Should any current or prospective mortgagee or ground lessor for the Building or Project require a modification of this Lease, which modification will not cause an increased cost or expense to Tenant or in any other way materially and adversely change the rights and obligations of Tenant hereunder, then and in such event, Tenant agrees that this Lease may be so modified and agrees to execute whatever documents are reasonably required therefor and to deliver the same to Landlord within ten (10) days following a request therefor.  At the request of Landlord or any mortgagee or ground lessor, Tenant agrees to execute a short form of Lease and deliver the same to Landlord within ten (10) days following the request therefor.

29.5Transfer of Landlord's Interest.  Tenant acknowledges that Landlord has the right to transfer all or any portion of its interest in the Project or Building and in this Lease, and Tenant agrees that in the event of any such transfer, Landlord shall automatically be released from all liability under this Lease and Tenant agrees to look solely to such transferee for the performance of Landlord's obligations hereunder after the date of transfer and such transferee shall be deemed to have fully assumed and be liable for all obligations of this Lease to be performed by Landlord, including the return of any Security Deposit, and Tenant shall attorn to such transferee.

29.6Prohibition Against Recording.  Except as provided in Section 29.4 of this Lease, neither this Lease, nor any memorandum, affidavit or other writing with respect thereto, shall be recorded by Tenant or by anyone acting through, under or on behalf of Tenant.

29.7Landlord's Title.  Landlord's title is and always shall be paramount to the title of Tenant.  Nothing herein contained shall empower Tenant to do any act which can, shall or may encumber the title of Landlord.

29.8Relationship of Parties.  Nothing contained in this Lease shall be deemed or construed by the parties hereto or by any third party to create the relationship of principal and agent, partnership, joint venturer or any association between Landlord and Tenant.

29.9Application of Payments.  Landlord shall have the right to apply payments received from Tenant pursuant to this Lease, regardless of Tenant's designation of such

payments, to satisfy any obligations of Tenant hereunder, in such order and amounts as Landlord, in its sole discretion, may elect. 

29.10Time of Essence.  Time is of the essence with respect to the performance of every provision of this Lease in which time of performance is a factor, including, without limitation, the giving of any Notice required to be given under this Lease or by law, the time periods for giving any such Notice and the taking of any action with respect to any such Notice.

29.11Partial Invalidity.  If any term, provision or condition contained in this Lease shall, to any extent, be invalid or unenforceable, the remainder of this Lease, or the application of such term, provision or condition to persons or circumstances other than those with respect to which it is invalid or unenforceable, shall not be affected thereby, and each and every other term, provision and condition of this Lease shall be valid and enforceable to the fullest extent possible permitted by law.

29.12No Warranty.  In executing and delivering this Lease, Tenant has not relied on any representations, including, but not limited to, any representation as to the amount of any item comprising Additional Rent or the amount of the Additional Rent in the aggregate or that Landlord is furnishing the same services to other tenants, at all, on the same level or on the same basis, or any warranty or any statement of Landlord which is not set forth herein or in one or more of the exhibits attached hereto.

29.13Landlord Exculpation.  The liability of Landlord or the Landlord Parties to Tenant for any default by Landlord under this Lease or arising in connection herewith or with Landlord's operation, management, leasing, repair, renovation, alteration or any other matter relating to the Project or the Premises shall be limited solely and exclusively to an amount which is equal to the interest of Landlord in the Building.  Neither Landlord, nor any of the Landlord Parties shall have any personal liability therefor, and Tenant hereby expressly waives and releases such personal liability on behalf of itself and all persons claiming by, through or under Tenant.  The limitations of liability contained in this Section 29.13 shall inure to the benefit of Landlord's and the Landlord Parties' present and future partners, beneficiaries, officers, directors, trustees, shareholders, agents and employees, and their respective partners, heirs, successors and assigns.  Under no circumstances shall any present or future partner of Landlord (if Landlord is a partnership), or trustee or beneficiary (if Landlord or any partner of Landlord is a trust), have any liability for the performance of Landlord's obligations under this Lease.  Notwithstanding any contrary provision herein, neither Landlord nor the Landlord Parties shall be liable under any circumstances for any indirect or consequential damages or any injury or damage to, or interference with, Tenant's business, including but not limited to, loss of profits, loss of rents or other revenues, loss of business opportunity, loss of goodwill or loss of use, in each case, however occurring.

29.14Entire Agreement.  It is understood and acknowledged that there are no oral agreements between the parties hereto affecting this Lease and this Lease constitutes the parties' entire agreement with respect to the leasing of the Premises and supersedes and cancels any and all previous negotiations, arrangements, brochures, agreements and understandings, if any, between the parties hereto or displayed by Landlord to Tenant with respect to the subject matter thereof, and none thereof shall be used to interpret or construe this Lease.  None of the terms,

covenants, conditions or provisions of this Lease can be modified, deleted or added to except in writing signed by the parties hereto. 

29.15Right to Lease.  Landlord reserves the absolute right to effect such other tenancies in the Project as Landlord in the exercise of its sole business judgment shall determine to best promote the interests of the Building or Project.  Tenant does not rely on the fact, nor does Landlord represent, that any specific tenant or type or number of tenants shall, during the Lease Term, occupy any space in the Building or Project.

29.16Force Majeure.  Any prevention, delay or stoppage due to strikes, lockouts, labor disputes, acts of God, inability to obtain services, labor, or materials or reasonable substitutes therefor, governmental actions, civil commotions, fire or other casualty, and other causes beyond the reasonable control of the party obligated to perform, except with respect to the obligations imposed with regard to Rent and other charges to be paid by Tenant pursuant to this Lease (collectively, a "Force Majeure"), notwithstanding anything to the contrary contained in this Lease, shall excuse the performance of such party for a period equal to any such prevention, delay or stoppage and, therefore, if this Lease specifies a time period for performance of an obligation of either party, that time period shall be extended by the period of any delay in such party's performance caused by a Force Majeure.

29.17Waiver of Redemption by Tenant.  Tenant hereby waives, for Tenant and for all those claiming under Tenant, any and all rights now or hereafter existing to redeem by order or judgment of any court or by any legal process or writ, Tenant's right of occupancy of the Premises after any termination of this Lease.

29.18Tenant Parking.  Tenant shall have the right to park up to forty-four (44) automobiles (i.e., 3.3 automobiles for every 1,000 rentable square feet in the Premises), free of charge, in the portions of the Common Areas designated by Landlord for vehicular parking.  Such parking shall be on an as available "first-come, first-served" basis which shall be in common with all other tenants of the Project. Tenant's continued right to use the Common Areas designated by Landlord for vehicular parking is conditioned upon Tenant abiding by all reasonable rules and regulations which are prescribed from time to time for the orderly operation and use of the parking facility, including any sticker or other identification system established by Landlord, Tenant's cooperation in seeing that Tenant's employees and visitors also comply with such rules and regulations and Tenant not being in default under this Lease.  Landlord specifically reserves the right to change the size, configuration, design, layout and all other aspects of the Project parking facility at any time and Tenant acknowledges and agrees that Landlord may, without incurring any liability to Tenant and without any abatement of Rent under this Lease, from time to time, close-off or restrict access to the Project parking facility for purposes of permitting or facilitating any such construction, alteration or improvements.  Landlord may delegate its responsibilities hereunder to a parking operator in which case such parking operator shall have all the rights of control attributed hereby to the Landlord.  The parking passes rented by Tenant pursuant to this Section 29.18 are provided to Tenant solely for use by Tenant's own personnel and such passes may not be transferred, assigned, subleased or otherwise alienated by Tenant without Landlord's prior approval.  Tenant may validate visitor parking by such method or methods as the Landlord may establish, at the validation rate from time to time generally applicable to visitor parking.

29.19Joint and Several.  If there is more than one Tenant, the obligations imposed upon Tenant under this Lease shall be joint and several. 

29.20Authority.  Tenant hereby represents and warrants that Tenant is a duly formed and existing entity qualified to do business in California and that Tenant has full right and authority to execute and deliver this Lease and that each person signing on behalf of Tenant is authorized to do so.  

29.21Attorneys' Fees.  In the event that either Landlord or Tenant should bring suit for the possession of the Premises, for the recovery of any sum due under this Lease, or because of the breach of any provision of this Lease or for any other relief against the other, then all costs and expenses, including reasonable attorneys' fees, incurred by the prevailing party therein shall be paid by the other party, which obligation on the part of the other party shall be deemed to have accrued on the date of the commencement of such action and shall be enforceable whether or not the action is prosecuted to judgment.

29.22Governing Law; WAIVER OF TRIAL BY JURY.  This Lease shall be construed and enforced in accordance with the laws of the State of California.  IN ANY ACTION OR PROCEEDING ARISING HEREFROM, LANDLORD AND TENANT HEREBY CONSENT TO (I) THE JURISDICTION OF ANY COMPETENT COURT WITHIN THE STATE OF CALIFORNIA, (II) SERVICE OF PROCESS BY ANY MEANS AUTHORIZED BY CALIFORNIA LAW, AND (III) IN THE INTEREST OF SAVING TIME AND EXPENSE, TRIAL WITHOUT A JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM BROUGHT BY EITHER OF THE PARTIES HERETO AGAINST THE OTHER OR THEIR SUCCESSORS IN RESPECT OF ANY MATTER ARISING OUT OF OR IN CONNECTION WITH THIS LEASE, THE RELATIONSHIP OF LANDLORD AND TENANT, TENANT'S USE OR OCCUPANCY OF THE PREMISES, AND/OR ANY CLAIM FOR INJURY OR DAMAGE, OR ANY EMERGENCY OR STATUTORY REMEDY.  IN THE EVENT LANDLORD COMMENCES ANY SUMMARY PROCEEDINGS OR ACTION FOR NONPAYMENT OF BASE RENT OR ADDITIONAL RENT, TENANT SHALL NOT INTERPOSE ANY COUNTERCLAIM OF ANY NATURE OR DESCRIPTION (UNLESS SUCH COUNTERCLAIM SHALL BE MANDATORY) IN ANY SUCH PROCEEDING OR ACTION, BUT SHALL BE RELEGATED TO AN INDEPENDENT ACTION AT LAW.

29.23Submission of Lease.  Submission of this instrument for examination or signature by Tenant does not constitute a reservation of, option for or option to lease, and it is not effective as a lease or otherwise until execution and delivery by both Landlord and Tenant.

29.24Brokers.  Landlord and Tenant hereby warrant to each other that they have had no dealings with any real estate broker or agent in connection with the negotiation of this Lease, excepting only the real estate brokers or agents specified in Section 11 of the Summary (the "Brokers"), and that they know of no other real estate broker or agent who is entitled to a commission in connection with this Lease.  Each party agrees to indemnify and defend the other party against and hold the other party harmless from any and all claims, demands, losses, liabilities, lawsuits, judgments, costs and expenses (including without limitation reasonable attorneys' fees) with respect to any leasing commission or equivalent compensation alleged to be

owing on account of any dealings with any real estate broker or agent, other than the Brokers, occurring by, through, or under the indemnifying party. 

29.25Independent Covenants.  This Lease shall be construed as though the covenants herein between Landlord and Tenant are independent and not dependent and Tenant hereby expressly waives the benefit of any statute to the contrary and agrees that if Landlord fails to perform its obligations set forth herein, Tenant shall not be entitled to make any repairs or perform any acts hereunder at Landlord's expense or to any setoff of the Rent or other amounts owing hereunder against Landlord.

29.26Project or Building Name and Signage.  Landlord shall have the right at any time to change the name of the Project or Building and to install, affix and maintain any and all signs on the exterior and on the interior of the Project or Building as Landlord may, in Landlord's sole discretion, desire.  Tenant shall not use the words "Gateway Center" or the name of the Project or Building or use pictures or illustrations of the Project or Building in advertising or other publicity or for any purpose other than as the address of the business to be conducted by Tenant in the Premises, without the prior written consent of Landlord.

29.27Counterparts.  This Lease may be executed in counterparts with the same effect as if both parties hereto had executed the same document.  Both counterparts shall be construed together and shall constitute a single lease.

29.28Confidentiality.  Tenant acknowledges that the content of this Lease and any related documents are confidential information.  Tenant shall keep such confidential information strictly confidential and shall not disclose such confidential information to any person or entity other than Tenant's financial, legal, and space planning consultants.  Notwithstanding the foregoing, Landlord understands and acknowledges that Tenant is subject to the public reporting requirements of the Securities Exchange Act of 1934, as amended, and, as such, Tenant may be required to publicly disclose this Lease as a material agreement of the Tenant.  Landlord hereby consents to Tenant’s disclosure of this Agreement as required by law or the rules of any stock exchange that are applicable to Tenant.

29.29Development of the Project.

29.29.1Subdivision.  Landlord reserves the right to further subdivide all or a portion of the Project.  Tenant agrees to execute and deliver, upon demand by Landlord and in the form requested by Landlord, any additional documents needed to conform this Lease to the circumstances resulting from such subdivision.

29.29.2The Other Improvements.  If portions of the Project or property adjacent to the Project (collectively, the "Other Improvements") are owned by an entity other than Landlord, Landlord, at its option, may enter into an agreement with the owner or owners of any or all of the Other Improvements to provide (i) for reciprocal rights of access and/or use of the Project and the Other Improvements, (ii) for the common management, operation, maintenance, improvement and/or repair of all or any portion of the Project and the Other Improvements, (iii) for the allocation of a portion of the Direct Expenses to the Other Improvements and the operating expenses and taxes for the Other Improvements to the Project,

and (iv) for the use or improvement of the Other Improvements and/or the Project in connection with the improvement, construction, and/or excavation of the Other Improvements and/or the Project.  Nothing contained herein shall be deemed or construed to limit or otherwise affect Landlord's right to convey all or any portion of the Project or any other of Landlord's rights described in this Lease. 

29.29.3Construction of Project and Other Improvements.  Tenant acknowledges that portions of the Project and/or the Other Improvements may be under construction following Tenant's occupancy of the Premises, and that such construction may result in levels of noise, dust, odor, obstruction of access, etc. which are in excess of that present in a fully constructed project.  Tenant hereby waives any and all rent offsets or claims of constructive eviction which may arise in connection with such construction.

29.30Building Renovations.  It is specifically understood and agreed that Landlord has no obligation and has made no promises to alter, remodel, improve, renovate, repair or decorate the Premises, Building, or any part thereof and that no representations respecting the condition of the Premises or the Building have been made by Landlord to Tenant except as specifically set forth herein or in the Tenant Work Letter.  However, Tenant hereby acknowledges that Landlord is currently renovating or may during the Lease Term renovate, improve, alter, or modify (collectively, the "Renovations") the Project, the Building and/or the Premises.  Tenant hereby agrees that such Renovations shall in no way constitute a constructive eviction of Tenant nor entitle Tenant to any abatement of Rent.  Landlord shall have no responsibility and shall not be liable to Tenant for any injury to or interference with Tenant's business arising from the Renovations, nor shall Tenant be entitled to any compensation or damages from Landlord for loss of the use of the whole or any part of the Premises or of Tenant's personal property or improvements resulting from the Renovations, or for any inconvenience or annoyance occasioned by such Renovations.

29.31No Violation.  Tenant hereby warrants and represents that neither its execution of nor performance under this Lease shall cause Tenant to be in violation of any agreement, instrument, contract, law, rule or regulation by which Tenant is bound, and Tenant shall protect, defend, indemnify and hold Landlord harmless against any claims, demands, losses, damages, liabilities, costs and expenses, including, without limitation, reasonable attorneys' fees and costs, arising from Tenant's breach of this warranty and representation.

29.32Communications and Computer Lines.  Tenant may install, maintain, replace, remove or use any electrical, communications or computer wires and cables (collectively, the "Lines") at the Project in or serving solely the Premises, provided that (i) Tenant shall obtain Landlord's prior written consent, use an experienced and qualified contractor approved in writing by Landlord, and comply with all of the other provisions of Articles 7 and 8 of this Lease, (ii) an acceptable number of spare Lines and space for additional Lines shall be maintained for existing and future occupants of the Project, as determined in Landlord's reasonable opinion, (iii) the Lines therefor (including riser cables) shall be appropriately insulated to prevent excessive electromagnetic fields or radiation, and shall be surrounded by a protective conduit reasonably acceptable to Landlord, (iv) any new or existing Lines servicing the Premises shall comply with all applicable governmental laws and regulations, (v) as a condition to permitting the installation of new Lines, Landlord may require that Tenant remove existing Lines located in or serving the

Premises and repair any damage in connection with such removal, and (vi) Tenant shall pay all costs in connection therewith.  Landlord reserves the right to require that Tenant remove any Lines located in or serving the Premises which are installed in violation of these provisions, or which are at any time in violation of any laws or represent a dangerous or potentially dangerous condition.  Landlord further reserves the right to require that Tenant remove any and all Lines located in or serving the Premises upon the expiration of the Lease Term or upon any earlier termination of this Lease. 

29.33Intentionally Omitted.  

29.34No Discrimination.  There shall be no discrimination against, or segregation of, any person or persons on account of sex, marital status, race, color, religion, creed, national origin or ancestry in the Transfer of the Premises, or any portion thereof, nor shall the Tenant itself, or any person claiming under or through it, establish or permit any such practice or practices of discrimination or segregation with reference to the selection, location, number, use or occupancy of tenants, lessees, subtenants, sublessees, or vendees of the Premises, or any portion thereof.

29.35Patriot Act and Executive Order 13224.  As an inducement to Landlord to enter into this Lease, Tenant hereby represents and warrants that:  (i) Tenant is not, nor is it owned or controlled directly or indirectly by, any person, group, entity or nation named on any list issued by the Office of Foreign Assets Control of the United States Department of the Treasury (“OFAC”) pursuant to Executive Order 13224 or any similar list or any law, order, rule or regulation or any Executive Order of the President of the United States as a terrorist, “Specially Designated National and Blocked Person” or other banned or blocked person (any such person, group, entity or nation being hereinafter referred to as a “Prohibited Person”); (ii) Tenant is not (nor is it owned or controlled, directly or indirectly, by any person, group, entity or nation which is) acting directly or indirectly for or on behalf of any Prohibited Person; and (iii) neither Tenant (nor any person, group, entity or nation which owns or controls Tenant, directly or indirectly) has conducted or will conduct business or has engaged or will engage in any transaction or dealing with any Prohibited Person, including without limitation any assignment of this Lease or any subletting of all or any portion of the Premises or the making or receiving of any contribution of funds, goods or services to or for the benefit of a Prohibited Person.  In connection with the foregoing, it is expressly understood and agreed that (x) any breach by Tenant of the foregoing representations and warranties shall be deemed a default by Tenant under Section 19.1.4 of this Lease and shall be covered by the indemnity provisions of Section 10.1 above, and (y) the representations and warranties contained in this subsection shall be continuing in nature and shall survive the expiration or earlier termination of this Lease.

[signature page to follow]

IN WITNESS WHEREOF, Landlord and Tenant have caused this Lease to be executed the day and date first above written.

"Landlord":

BXP 611 GATEWAY CENTER LP,

a Delaware limited partnership

BY: BXP CALIFORNIA GP LLC,

a Delaware limited liability company,

its general partner

BY:  BOSTON PROPERTIES LIMITED PARTNERSHIP,

a Delaware limited partnership,

its sole member

BY:  BOSTON PROPERTIES, INC.,

a Delaware corporation,

its general partner

BY:  __/s/ Rob C. Diehl______

Name:  Rob C. Diehl

Title: Senior Vice President, Leasing

"Tenant":

ATARA BIOTHERAPEUTICS, INC.,
a Delaware corporation

PLEASE NOTE:  THIS LEASE MUST BE EXECUTED BY EITHER (I) BOTH (A) THE CHAIRMAN OF THE BOARD, THE PRESIDENT OR ANY VICE PRESIDENT OF TENANT, AND (B) THE SECRETARY, ANY ASSISTANT SECRETARY, THE CHIEF FINANCIAL OFFICER, OR ANY ASSISTANT TREASURER OF TENANT; OR (II) AN

AUTHORIZED SIGNATORY OF TENANT PURSUANT TO A CERTIFIED CORPORATE RESOLUTION, A COPY OF WHICH SHOULD BE DELIVERED WITH THE EXECUTED ORIGINALS.

EXHIBIT A

611 GATEWAY BOULEVARD

OUTLINE OF PREMISES

EXHIBIT A-1

OUTLINE OF FIRST OFFER SPACE

EXHIBIT B

611 GATEWAY BOULEVARD

TENANT WORK LETTER

This Tenant Work Letter shall set forth the terms and conditions relating to the construction of the Premises.  This Tenant Work Letter is essentially organized chronologically and addresses the issues of the construction of the Premises, in sequence, as such issues will arise during the actual construction of the Premises.  All references in this Tenant Work Letter to Articles or Sections of "this Lease" shall mean the relevant portions of Articles 1 through 29 of the Office Lease to which this Tenant Work Letter is attached as Exhibit B, and all references in this Tenant Work Letter to Sections of "this Tenant Work Letter" shall mean the relevant portions of Sections 1 through 5 of this Tenant Work Letter.

SECTION 1

BASE, SHELL AND CORE

1.1Base, Shell and Core.  Landlord has constructed, at its sole cost and expense, the base, shell, and core (i) of the Premises and (ii) of the floor of the Building on which the Premises is located (collectively, the "Base, Shell, and Core").  The Base, Shell and Core shall consist of the following elements: (A) base Building systems located in the vertical risers, raceways, and shafts (including elevator shafts and equipment, the telecom riser exclusive of equipment owned by third parties, electrical rooms, stair shafts and mechanical shafts) up to but not including the point of demarcation of such systems with the horizontal point of connection on a particular floor; (B) in the case of the sprinkler system, it shall additionally include the valve at the riser and the main sprinkler loop, but shall exclude branch pipes; (C) the concrete floor at each floor level, and (D) the Building’s steel and concrete superstructure.  Notwithstanding anything set forth in this Tenant Work Letter to the contrary, Tenant shall accept the Base, Shell and Core from Landlord in their presently existing, "as-is" condition.  

1.2Landlord Work.  Landlord shall, at Landlord’s sole cost and expense, concurrently with Tenant's construction of the Tenant Improvements, cause the construction or installation of the following items on the floor of the Building containing the Premises (collectively, the "Landlord Work").  Tenant may not change or alter the Landlord Work.

1.2.1Public Corridor.  A Building standard public corridor wall, the standard tenant entries and exits including doors, frames, hardware, and sidelight (if any), and standard tenant entry signage and exit lights (collectively, the "Public Corridor"), which Public Corridor is adjacent to the Premises as set forth on Exhibit A to the Lease.

1.2.2Demising Walls Between Tenants.  Building standard demising partitions between tenants which shall include studs, acoustical insulation and dry wall ready for finish on tenant side only and any necessary penetrations, fire dampers and sound traps (collectively, the "Demising Walls"), which Demising Walls are adjacent to the Premises as set forth on Exhibit A to the Lease.

Because Landlord shall be constructing the Landlord Work concurrently with Tenant's construction of the Tenant Improvements, there will be a certain “overlap” period pursuant to which both Landlord’s representatives, employees, vendors and contractors and Tenant’s representatives, employees, vendors and contractors may be present and performing work in a portion of the Premises.  During any such “overlap” period(s) when both parties and/or their respective employees, vendors, contractors or consultants are concurrently performing work in, or accessing, any portion of the Premises, neither party shall unreasonably interfere with or delay the work of the other party and/or its contractors or consultants, and both parties shall mutually coordinate and cooperate with each other, and shall cause their respective employees, vendors, contractors, and consultants to work in harmony with and to mutually coordinate and cooperate with the other’s employees, vendors, contractors and consultants, respectively, to minimize any interference or delay by either party with respect to the other party’s work.

SECTION 2

TENANT IMPROVEMENTS

2.1Tenant Improvement Allowance.  Tenant shall be entitled to a one-time tenant improvement allowance (the "Tenant Improvement Allowance") in the amount set forth in Section 12 of the Summary for the costs relating to the initial design and construction of Tenant's improvements, which are permanently affixed to the Premises (the "Tenant Improvements").  In no event shall Landlord be obligated to make disbursements pursuant to this Tenant Work Letter in a total amount which exceeds the Tenant Improvement Allowance.  In addition, Landlord shall contribute an amount not to exceed $0.15 per rentable square foot of the Premises ("Landlord's Drawing Contribution") toward the cost of one (1) preliminary space plan to be prepared by "Architect/Space Planner," as that term is defined in Section 3.1, below, and no portion of the Landlord's Drawing Contribution, if any, remaining after the completion of the Tenant Improvements shall be available for use by Tenant.  In the event that the Tenant Improvement Allowance or Landlord's Drawing Contribution is not fully utilized by Tenant on or before the first (1^st) anniversary of the Lease Commencement Date, then such unused amounts shall revert to Landlord, and Tenant shall have no further rights with respect thereto.  Any Tenant Improvements that require the use of Building risers, raceways, shafts and/or conduits, shall be subject to Landlord's reasonable rules, regulations, and restrictions, including the requirement that any cabling vendor must be selected from a list provided by Landlord, and that the amount and location of any such cabling must be approved by Landlord.  All Tenant Improvements for which the Tenant Improvement Allowance has been made available shall be deemed Landlord's property under the terms of the Lease; provided, however, Landlord may, by written notice to Tenant prior to the end of the Lease Term, or given following any earlier termination of this Lease, require Tenant, at Tenant's expense, to remove any Tenant Improvements and to repair any damage to the Premises and Building caused by such removal and return the affected portion of the Premises to their condition existing prior to the installment of such Tenant Improvements.

2.2Disbursement of the Tenant Improvement Allowance.

2.2.1Tenant Improvement Allowance Items.  Except as otherwise set forth in this Tenant Work Letter, the Tenant Improvement Allowance shall be disbursed by Landlord

only for the following items and costs (collectively the "Tenant Improvement Allowance Items"): 

2.2.1.1Payment of the fees of the "Architect" and the "Engineers," as those terms are defined in Section 3.1 of this Tenant Work Letter, which fees shall, notwithstanding anything to the contrary contained in this Tenant Work Letter, not exceed an aggregate amount equal to $3.00 per rentable square foot of the Premises, and payment of the fees incurred by, and the cost of documents and materials supplied by, Landlord and Landlord's consultants in connection with the preparation and review of the "Construction Drawings," as that term is defined in Section 3.1 of this Tenant Work Letter;

2.2.1.2The payment of plan check, permit and license fees relating to construction of the Tenant Improvements;

2.2.1.3The cost of construction of the Tenant Improvements, including, without limitation, testing and inspection costs, freight elevator usage, hoisting and trash removal costs, and contractors' fees and general conditions;

2.2.1.4The cost of any changes in the Base Building when such changes are required by the Construction Drawings (including if such changes are due to the fact that such work is prepared on an unoccupied basis), such cost to include all direct architectural and/or engineering fees and expenses incurred in connection therewith;

2.2.1.5The cost of any changes to the Construction Drawings or Tenant Improvements required by all applicable building codes (the "Code");

2.2.1.6The cost of connection of the Premises to the Building's energy management systems;

2.2.1.7The cost of the "Coordination Fee," as that term is defined in Section 4.2.2 of this Tenant Work Letter;

2.2.1.8Sales and use taxes and Title 24 fees; and

2.2.1.9All other actual and reasonable out-of-pocket costs expended by Landlord in connection with the construction of the Tenant Improvements.

2.2.2Disbursement of Tenant Improvement Allowance.  During the construction of the Tenant Improvements, Landlord shall make monthly disbursements of the Tenant Improvement Allowance for Tenant Improvement Allowance Items for the benefit of Tenant and shall authorize the release of monies for the benefit of Tenant as follows.

2.2.2.1Monthly Disbursements.  On or before the day of each calendar month, as determined by Landlord, during the construction of the Tenant Improvements (or such other date as Landlord may designate), Tenant shall deliver to Landlord:  (i) a request for payment of the "Contractor," as that term is defined in Section 4.1 of this Tenant Work Letter, approved by Tenant, in a form to be provided by Landlord, showing the schedule, by trade, of percentage of completion of the Tenant Improvements in the Premises, detailing the portion of

the work completed and the portion not completed; (ii) invoices from all of "Tenant's Agents," as that term is defined in Section 4.1.2 of this Tenant Work Letter, for labor rendered and materials delivered to the Premises; (iii) executed mechanic's lien releases from all of Tenant's Agents which shall comply with the appropriate provisions, as reasonably determined by Landlord, of California Civil Code Section 3262(d); and (iv) all other information reasonably requested by Landlord.  Tenant's request for payment shall be deemed Tenant's acceptance and approval of the work furnished and/or the materials supplied as set forth in Tenant's payment request.  Thereafter, Landlord shall deliver a check to Tenant in payment of the lesser of:  (A) the amounts so requested by Tenant, as set forth in this Section 2.2.2.1, above, less a ten percent (10%) retention (the aggregate amount of such retentions to be known as the "Final Retention"), and (B) the balance of any remaining available portion of the Tenant Improvement Allowance (not including the Final Retention), provided that Landlord does not dispute any request for payment based on non-compliance of any work with the "Approved Working Drawings," as that term is defined in Section 3.4 below, or due to any substandard work, or for any other reason.  Landlord's payment of such amounts shall not be deemed Landlord's approval or acceptance of the work furnished or materials supplied as set forth in Tenant's payment request. 

2.2.2.2Final Retention.  Subject to the provisions of this Tenant Work Letter, a check for the Final Retention shall be delivered by Landlord to Tenant following the completion of construction of the Premises, provided that (i) Tenant delivers to Landlord properly executed mechanics lien releases in compliance with both California Civil Code Section 3262(d)(2) and either Section 3262(d)(3) or Section 3262(d)(4), (ii) Landlord has determined that no substandard work exists which adversely affects the mechanical, electrical, plumbing, heating, ventilating and air conditioning, life-safety or other systems of the Building, the curtain wall of the Building, the structure or exterior appearance of the Building, or any other tenant's use of such other tenant's leased premises in the Building and (iii) Architect delivers to Landlord a certificate, in a form reasonably acceptable to Landlord, certifying that the construction of the Tenant Improvements in the Premises has been substantially completed.  

2.2.2.3Other Terms.  Landlord shall only be obligated to make disbursements from the Tenant Improvement Allowance to the extent costs are incurred by Tenant for Tenant Improvement Allowance Items.  All Tenant Improvement Allowance Items for which the Tenant Improvement Allowance has been made available shall be deemed Landlord's property under the terms of this Lease.

2.3Standard Tenant Improvement Package.  Landlord has established specifications (the "Specifications") for the Building standard components to be used in the construction of the Tenant Improvements in the Premises (collectively, the "Standard Improvement Package"), which Specifications shall be supplied to Tenant by Landlord.  The quality of Tenant Improvements shall be equal to or of greater quality than the quality of the Specifications, provided that the Tenant Improvements shall comply with certain Specifications as designated by Landlord.  Landlord may make changes to the Specifications for the Standard Improvement Package from time to time.

2.4Additional Allowance.  On or before the Delivery Date, Tenant shall be entitled, pursuant to a written notice delivered to Landlord, to a one‑time increase (the "Additional Allowance") of the Tenant Improvement Allowance in an amount not to exceed $10.00 for each

of the 13,670 rentable square feet of the Premises, for the costs relating to the initial design and construction of the Tenant Improvements.  In the event Tenant exercises its right to use all or any portion of the Additional Allowance, the monthly Base Rent for the Premises shall be increased by an amount equal to the "Additional Monthly Base Rent," as that term is defined below, in order to repay the Additional Allowance to Landlord.  The "Additional Monthly Base Rent" shall be determined as the missing component of an annuity, which annuity shall have (i) the amount of the Additional Allowance which Tenant elects to utilize as the present value amount, (ii) sixth (60) as the number of payments, (iii) seventy‑one one‑hundredths (.71), which is equal to eight and one-half percent (8.5%) divided by twelve (12) months per year, as the monthly interest factor, and (iv) the Additional Monthly Base Rent as the missing component of the annuity.  In the event Tenant elects to utilize all or a portion of the Additional Allowance, then (a) all references in this Tenant Work Letter to the "Tenant Improvement Allowance", shall be deemed to include the Additional Allowance which Tenant elects to utilize, (b) the parties shall promptly execute an amendment (the "Amendment") to this Lease setting forth the new amount of the Base Rent and Tenant Improvement Allowance computed in accordance with this Section 2.4, (c) Tenant shall deposit with Landlord, concurrently with Tenant's execution and delivery of the Amendment to Landlord, cash in an amount equal to the Additional Allowance, which amount shall be held as part of the Security Deposit, and the Amendment shall contain the new amount of the Security Deposit, and (d) the additional amount of monthly Base Rent owing in accordance with this Section 2.1 for the first full month of the Lease Term which occurs after the expiration of any free rent period shall be paid by Tenant to Landlord at the time of Tenant's execution of the Amendment. 

SECTION 3

CONSTRUCTION DRAWINGS

3.1Selection of Architect/Construction Drawings.  Tenant shall retain the architect/space planner designated by Landlord and reasonably acceptable to Tenant (the "Architect") to prepare the "Construction Drawings," as that term is defined in this Section 3.1.  Tenant shall retain the engineering consultants designated by Landlord and reasonably acceptable to Tenant (the "Engineers") to prepare all plans and engineering working drawings relating to the structural, mechanical, electrical, plumbing, HVAC, lifesafety, and sprinkler work in the Premises, which work is not part of the Base Building.  The plans and drawings to be prepared by Architect and the Engineers hereunder (including the "Final Space Plans" and the "Final Working Drawings," as those terms are defined in Section 3.2 and 3.3, below, respectively) shall be known collectively as the "Construction Drawings."  All Construction Drawings shall comply with the drawing format and specifications reasonably determined by Landlord and consistent with industry standards, and shall be subject to Landlord's approval, which approval shall not be unreasonably withheld.  Notwithstanding anything set forth herein to the contrary, Landlord and Tenant hereby agree that it shall be deemed reasonable for Landlord to withhold its approval of the Construction Drawings if a "Design Problem" exists.  A "Design Problem" shall mean and refer to any design criteria which would (a) affect the Building Structure or Building Systems; (b) be in non-compliance with Codes or other Applicable Laws; (c) be seen from the exterior of the Premises; (d) cause material interference with Landlord or other tenants of the Building, (e) not comply with the Standard Improvement Package; (f) affect the certificate of occupancy or its legal equivalent for the Building or any portion thereof, or

(g) not, in Landlord's reasonable opinion, be readily useable for typical general office use by another tenant as a result of the unique configuration contemplated by the Final Space Plan.  Tenant and Architect shall verify, in the field, the dimensions and conditions as shown on the relevant portions of the base building plans, and Tenant and Architect shall be solely responsible for the same, and Landlord shall have no responsibility in connection therewith.  Landlord's review of the Construction Drawings as set forth in this Section 3, shall be for its sole purpose and shall not imply Landlord's review of the same, or obligate Landlord to review the same, for quality, design, Code compliance or other like matters.  Accordingly, notwithstanding that any Construction Drawings are reviewed by Landlord or its space planner, architect, engineers and consultants, and notwithstanding any advice or assistance which may be rendered to Tenant by Landlord or Landlord's space planner, architect, engineers, and consultants, Landlord shall have no liability whatsoever in connection therewith and shall not be responsible for any omissions or errors contained in the Construction Drawings, and Tenant's waiver and indemnity set forth in this Lease shall specifically apply to the Construction Drawings. 

3.2Final Space Plan.  Tenant shall supply Landlord with four (4) copies signed by Tenant of its final space plan for the Premises before any architectural working drawings or engineering drawings have been commenced.  The final space plan (the "Final Space Plan") shall include a layout and designation of all offices, rooms and other partitioning, their intended use, and equipment to be contained therein.  Landlord may request clarification or more specific drawings for special use items not included in the Final Space Plan.  Landlord shall advise Tenant within five (5) business days after Landlord's receipt of the Final Space Plan for the Premises if the same is unsatisfactory or incomplete in any respect.  If Tenant is so advised, Tenant shall promptly cause the Final Space Plan to be revised to correct any deficiencies or other matters Landlord may reasonably require.

3.3Final Working Drawings.  After the Final Space Plan has been approved by Landlord, Tenant shall supply the Engineers with a complete listing of standard and non-standard equipment and specifications, including, without limitation, B.T.U. calculations, electrical requirements and special electrical receptacle requirements for the Premises, to enable the Engineers and the Architect to complete the "Final Working Drawings" (as that term is defined below) in the manner as set forth below.  Upon the approval of the Final Space Plan by Landlord and Tenant, Tenant shall promptly cause the Architect and the Engineers to complete the architectural and engineering drawings for the Premises, and Architect shall compile a fully coordinated set of architectural, structural, mechanical, electrical and plumbing working drawings in a form which is complete to allow subcontractors to bid on the work and to obtain all applicable permits (collectively, the "Final Working Drawings") and shall submit the same to Landlord for Landlord's approval.  Tenant shall supply Landlord with four (4) copies signed by Tenant of such Final Working Drawings.  Landlord shall advise Tenant within ten (10) business days after Landlord's receipt of the Final Working Drawings for the Premises if the same is unsatisfactory or incomplete in any respect.  If Tenant is so advised, Tenant shall immediately revise the Final Working Drawings in accordance with such review and any disapproval of Landlord in connection therewith.

3.4Approved Working Drawings.  The Final Working Drawings shall be approved by Landlord (the "Approved Working Drawings") prior to the commencement of construction of the Premises by Tenant.  After approval by Landlord of the Final Working Drawings, Tenant

may submit the same to the appropriate municipal authorities for all applicable building permits (the "Permits").  Tenant hereby agrees that neither Landlord nor Landlord's consultants shall be responsible for obtaining any building permit or certificate of occupancy for the Premises and that obtaining the same shall be Tenant's responsibility; provided, however, that Landlord shall cooperate with Tenant in executing permit applications and performing other ministerial acts reasonably necessary to enable Tenant to obtain any such permit or certificate of occupancy.  No changes, modifications or alterations in the Approved Working Drawings may be made without the prior written consent of Landlord, which consent may not be unreasonably withheld. 

SECTION 4

CONSTRUCTION OF THE TENANT IMPROVEMENTS

4.1Tenant's Selection of Contractors.

4.1.1The Contractor.  A general contractor shall be retained by Tenant to construct the Tenant Improvements.  Such general contractor ("Contractor") shall be selected by Tenant and subject to Landlord's reasonable approval.

4.1.2Tenant's Agents.  All subcontractors, laborers, materialmen, and suppliers used by Tenant (such subcontractors, laborers, materialmen, and suppliers, and the Contractor to be known collectively as "Tenant's Agents") shall be reasonably acceptable to Landlord.  

4.2Construction of Tenant Improvements by Tenant's Agents.

4.2.1Construction Contract; Cost Budget.  Prior to Tenant's execution of the construction contract and general conditions with Contractor (the "Contract"), Tenant shall submit the Contract to Landlord for its approval, which approval shall not be unreasonably withheld, conditioned or delayed.  Prior to the commencement of the construction of the Tenant Improvements, and after Tenant has accepted all bids for the Tenant Improvements, Tenant shall provide Landlord with a detailed breakdown, by trade, of the final costs to be incurred or which have been incurred, as set forth more particularly in Sections 2.2.1.1 through 2.2.1.9, above, in connection with the design and construction of the Tenant Improvements to be performed by or at the direction of Tenant or the Contractor, which costs form a basis for the amount of the Contract (the "Final Costs").  Prior to the commencement of construction of the Tenant Improvements, if an Over-Allowance Amount is present, Tenant shall supply Landlord with cash in an amount (the "Over-Allowance Amount") equal to the difference between the amount of the Final Costs and the amount of the Tenant Improvement Allowance (less any portion thereof already disbursed by Landlord, or in the process of being disbursed by Landlord, on or before the commencement of construction of the Tenant Improvements).  The Over-Allowance Amount shall be disbursed by Landlord prior to the disbursement of any of the then remaining portion of the Tenant Improvement Allowance, and such disbursement shall be pursuant to the same procedure as the Tenant Improvement Allowance.  In the event that, after the Final Costs have been delivered by Tenant to Landlord, the costs relating to the design and construction of the Tenant Improvements shall change, any additional costs necessary to such design and construction in excess of the Final Costs, shall be paid by Tenant to Landlord immediately as an addition to the Over-Allowance Amount or at Landlord's option, Tenant shall make payments for

such additional costs out of its own funds, but Tenant shall continue to provide Landlord with the documents described in Sections 2.2.2.1 (i), (ii), (iii) and (iv) of this Tenant Work Letter, above, for Landlord's approval, prior to Tenant paying such costs.  Notwithstanding anything set forth in this Tenant Work Letter to the contrary, construction of the Tenant Improvements shall not commence until (a) Landlord has approved the Contract, (b) Tenant has procured and delivered to Landlord a copy of all Permits, and (c) Tenant has delivered to Landlord the Over-Allowance Amount.   

4.2.2Tenant's Agents.

4.2.2.1Landlord's General Conditions for Tenant's Agents and Tenant Improvement Work.  Tenant's and Tenant's Agent's construction of the Tenant Improvements shall comply with the following:  (i) the Tenant Improvements shall be constructed in strict accordance with the Approved Working Drawings; (ii) Landlord's reasonable rules and regulations for the construction of improvements in the Building, (iii) Tenant's Agents shall submit schedules of all work relating to the Tenant's Improvements to Contractor and Contractor shall, within five (5) business days of receipt thereof, inform Tenant's Agents of any changes which are necessary thereto, and Tenant's Agents shall adhere to such corrected schedule; and (iv) Tenant shall abide by all reasonable rules made by Landlord's Building manager with respect to the use of freight, loading dock and service elevators, storage of materials, coordination of work with the contractors of other tenants, and any other matter in connection with this Tenant Work Letter, including, without limitation, the construction of the Tenant Improvements.  Tenant shall pay a logistical coordination fee (the "Coordination Fee") to Landlord in an amount equal to the three percent (3%) of the so-call "hard" construction costs in connection with the construction of the Tenant Improvements, which Coordination Fee shall be for services relating to the coordination of the construction of the Tenant Improvements.  In the event of a conflict between the Approved Working Drawings and Landlord's construction rules and regulations, Landlord, in its sole and absolute discretion, shall determine which shall prevail.  

4.2.2.2Indemnity.  Tenant's indemnity of Landlord as set forth in this Lease shall also apply with respect to any and all costs, losses, damages, injuries and liabilities related in any way to any act or omission of Tenant or Tenant's Agents, or anyone directly or indirectly employed by any of them, or in connection with Tenant's non-payment of any amount arising out of the Tenant Improvements and/or Tenant's disapproval of all or any portion of any request for payment.  Such indemnity by Tenant, as set forth in this Lease, shall also apply with respect to any and all costs, losses, damages, injuries and liabilities related in any way to Landlord's performance of  any ministerial acts reasonably necessary (i) to permit Tenant to complete the Tenant Improvements, and (ii) to enable Tenant to obtain any building permit or certificate of occupancy for the Premises.

4.2.2.3Requirements of Tenant's Agents.  Each of Tenant's Agents shall guarantee to Tenant and for the benefit of Landlord that the portion of the Tenant Improvements for which it is responsible shall be free from any defects in workmanship and materials for a period of not less than one (1) year from the date of completion thereof.  Each of Tenant's Agents shall be responsible for the replacement or repair, without additional charge, of all work done or furnished in accordance with its contract that shall become defective within one (1) year after the later to occur of (i) completion of the work performed by such contractor or subcontractors and

(ii) the Lease Commencement Date.  The correction of such work shall include, without additional charge, all additional expenses and damages incurred in connection with such removal or replacement of all or any part of the Tenant Improvements, and/or the Building and/or common areas that may be damaged or disturbed thereby.  All such warranties or guarantees as to materials or workmanship of or with respect to the Tenant Improvements shall be contained in the Contract or subcontract and shall be written such that such guarantees or warranties shall inure to the benefit of both Landlord and Tenant, as their respective interests may appear, and can be directly enforced by either.  Tenant covenants to give to Landlord any assignment or other assurances which may be necessary to effect such right of direct enforcement. 

4.2.2.4Insurance Requirements.  Tenant shall comply with the terms of Section 10.14 of the Lease with respect to the construction of the Tenant Improvements.  

4.2.3Governmental Compliance.  The Tenant Improvements shall comply in all respects with the following:  (i) the Code and other state, federal, city or quasi-governmental laws, codes, ordinances and regulations, as each may apply according to the rulings of the controlling public official, agent or other person; (ii) applicable standards of the American Insurance Association (formerly, the National Board of Fire Underwriters) and the National Electrical Code; and (iii) building material manufacturer's specifications.

4.2.4Inspection by Landlord.  Tenant shall provide Landlord with reasonable prior notice of any inspection to be performed by a governmental entity in connection with the construction of the Tenant Improvements in order to allow Landlord to be present during such inspection; provided however, once such notice is given, Tenant is under no obligation to coordinate such inspections with Landlord.  Landlord shall have the right to inspect the Tenant Improvements at all times, provided however, that Landlord's failure to inspect the Tenant Improvements shall in no event constitute a waiver of any of Landlord's rights hereunder nor shall Landlord's inspection of the Tenant Improvements constitute Landlord's approval of the same.  Should Landlord disapprove any portion of the Tenant Improvements, Landlord shall notify Tenant in writing of such disapproval and shall specify the items disapproved.  Any defects or deviations in, and/or disapproval by Landlord of, the Tenant Improvements shall be rectified by Tenant at no expense to Landlord, provided however, that in the event Landlord determines that a defect or deviation exists or disapproves of any matter in connection with any portion of the Tenant Improvements and such defect, deviation or matter might adversely affect the mechanical, electrical, plumbing, heating, ventilating and air conditioning or life-safety systems of the Building, the structure or exterior appearance of the Building or any other tenant's use of such other tenant's leased premises, Landlord may, take such action as Landlord deems necessary, at Tenant's expense and without incurring any liability on Landlord's part, to correct any such defect, deviation and/or matter, including, without limitation, causing the cessation of performance of the construction of the Tenant Improvements until such time as the defect, deviation and/or matter is corrected to Landlord's satisfaction.

4.2.5Meetings.  Commencing upon the execution of this Lease, Tenant shall hold weekly meetings at a reasonable time, with the Architect and the Contractor regarding the progress of the preparation of Construction Drawings and the construction of the Tenant Improvements, which meetings shall be held at a location designated by Landlord, and Landlord and/or its agents shall receive prior notice of, and shall have the right to attend, all such

meetings, and, upon Landlord's request, certain of Tenant's Agents shall attend such meetings.  In addition, minutes shall be taken at all such meetings, a copy of which minutes shall be promptly delivered to Landlord.  One such meeting each month shall include the review of Contractor's current request for payment. 

4.3Notice of Completion; Copy of Record Set of Plans.  Within ten (10) days after completion of construction of the Tenant Improvements, Tenant shall cause a Notice of Completion to be recorded in the office of the Recorder of the county in which the Building is located in accordance with Section 3093 of the Civil Code of the State of California or any successor statute, and shall furnish a copy thereof to Landlord upon such recordation.  If Tenant fails to do so, Landlord may execute and file the same on behalf of Tenant as Tenant's agent for such purpose, at Tenant's sole cost and expense.  At the conclusion of construction, (i) Tenant shall cause the Architect and Contractor (A) to update the Approved Working Drawings as necessary to reflect all changes made to the Approved Working Drawings during the course of construction, (B) to certify to the best of their knowledge that the "record-set" of as-built drawings are true and correct, which certification shall survive the expiration or termination of this Lease, and (C) to deliver to Landlord four (4) sets of copies of such record set of drawings within ninety (90) days following issuance of a certificate of occupancy for the Premises, and (ii) Tenant shall deliver to Landlord a copy of all warranties, guaranties, and operating manuals and information relating to the improvements, equipment, and systems in the Premises.

SECTION 5

MISCELLANEOUS

5.1Tenant's Representative.  Tenant has designated Heather Turner as its sole representative with respect to the matters set forth in this Tenant Work Letter, who shall have full authority and responsibility to act on behalf of the Tenant as required in this Tenant Work Letter.

5.2Landlord's Representative.  Landlord has designated Peter Back as its sole representatives with respect to the matters set forth in this Tenant Work Letter, who, until further notice to Tenant, shall have full authority and responsibility to act on behalf of the Landlord as required in this Tenant Work Letter.

5.3Time of the Essence in This Tenant Work Letter.  Unless otherwise indicated, all references herein to a "number of days" shall mean and refer to calendar days.  If any item requiring approval is timely disapproved by Landlord, the procedure for preparation of the document and approval thereof shall be repeated until the document is approved by Landlord.

5.4Tenant's Lease Default.  Notwithstanding any provision to the contrary contained in this Lease, if an event of default as described in the Lease or this Tenant Work Letter has occurred at any time on or before the Substantial Completion of the Premises, then (i) in addition to all other rights and remedies granted to Landlord pursuant to this Lease, Landlord shall have the right to withhold payment of all or any portion of the Tenant Improvement Allowance and/or Landlord may cause Contractor to cease the construction of the Premises (in which case, Tenant shall be responsible for any delay in the substantial completion of the Premises caused by such

work stoppage), and (ii) all other obligations of Landlord under the terms of this Tenant Work Letter shall be forgiven until such time as such default is cured pursuant to the terms of this Lease (in which case, Tenant shall be responsible for any delay in the substantial completion of the Premises caused by such inaction by Landlord). 

EXHIBIT C

611 GATEWAY BOULEVARD

NOTICE OF LEASE TERM DATES

Date:______

In accordance with the subject document we wish to advise you and/or confirm your tenancy of Suite _____ on the ____ floor of [APPROPRIATE BUILDING] Gateway Boulevard, South San Francisco, CA  94080, and that the following terms and conditions are accurate and in full force and effect:

Rent checks are

If the Lease Commencement Date is other than the first day of the month, the first billing will contain a pro rata adjustment.  Each billing thereafter, with the exception of the final billing, shall be for the full amount of the monthly installment as provided for in the Lease.

We request that you sign this letter where indicated below, confirming the information provided above, and return it to our representative below within five days of receipt.  A return envelope is provided.  Our failure to receive your executed Notice within such time period will

indicate your acceptance that the information set forth is correct.  A second letter is enclosed for your files.

EXHIBIT D

611 GATEWAY BOULEVARD

RULES AND REGULATIONS

1.Signs.  Except as specifically provided in this Lease to which these rules and regulations are attached, no sign, placard, picture, advertisement, name or notice shall be installed or displayed on any part of the outside or inside of the Building or on the Common Areas or other areas of the Project without Landlord’s prior written consent.  Landlord may remove, at Tenant’s expense and without notice, any sign installed or displayed in violation of this rule.  All signs or lettering on doors and walls must be approved by Landlord, and shall be printed, painted, affixed or inscribed or modified at Tenant’s expense by a person approved by Landlord.  Without Landlord’s written consent, Tenant shall not use the name of the Building or the Project in connection with or in promoting or advertising the business of Tenant except as Tenant’s address.  Landlord hereby agrees to provide Tenant with the Building’s standard graphics at the entrance to the Premises and in the elevator lobby.

2.Window Treatments.  Tenant shall not place anything against or near glass partitions or doors or windows which may appear unsightly from outside the Premises.  Tenant shall be held responsible for any damage to the glass coating within the Premises.  If Landlord objects in writing to any curtains, blinds, shades, screens or hanging plants or other similar objects attached to or used in connection with any window or door of the Premises, or placed on any windowsill, which are visible from the exterior of the Premises, Tenant shall immediately discontinue such use.

3.Common Areas.  The sidewalks, entrances, halls, corridors, elevators and stairways of the Building and the Project shall not be obstructed or used as a waiting or lounging place by Tenant and the Tenant’s Parties.  All entrance doors leading from the Premises to the hallways are to be kept closed at all times.  The outside areas immediately adjoining the Premises shall be kept clear at all times by Tenant, and Tenant shall not place or permit any obstructions, garbage, refuse, merchandise or displays in such areas.  The halls, passages, exits, entrances, elevators, escalators and stairways are not open to the general public, but are open, subject to reasonable regulations, to Tenant’s Parties.  Landlord shall, in all cases, retain the right to control and prevent access thereto of all persons whose presence in the judgment of Landlord would be prejudicial to the safety of the Project or any part thereof provided that nothing herein contained shall be construed to prevent such access to persons with whom any tenant normally deals in the ordinary course of its business, unless such persons are engaged in illegal or unlawful activities.  Neither Tenant nor any Tenant Parties shall go upon the roof of the Building.

4.Directory.  The directory of the Building will be provided for the display of the name and location of tenants, and Landlord reserves the right to exclude any other names therefrom.  Tenant shall be allocated its pro rata share of lines on the Building directory board in the main lobby.  

5.Cleanliness.  Tenant shall not exhibit carelessness or indifference to the good order and cleanliness of the Premises. 

6.Keys.  Landlord will furnish Tenant, free of charge, with two keys to each exterior door lock in the Premises.  All duplicate keys shall be purchased only from Landlord.  Landlord may charge a reasonable fee for any additional keys.  Tenant shall not make or have made additional keys, and Tenant shall not alter any lock or install a new additional lock or bolt on any door of its Premises.  Tenant, upon the termination of its tenancy, shall deliver to Landlord the keys to all doors and pay Landlord for any lost keys.

7.Security Devices.  If Tenant requires telephonic, burglar alarm or similar services, it shall first obtain and comply with Landlord’s instructions for their installation.

8.Freight Elevators.  The Building service elevator shall be available for use by all tenants in the Building, subject to such reasonable scheduling by Landlord.  No equipment, materials, furniture, packages, supplies, merchandise or other property will be received in the Building or carried in the elevators except between such hours and in such elevators as may be designated by Landlord.  Tenant’s initial move-in and subsequent deliveries of bulky items, such as furniture, safes and similar items shall be made after obtaining Landlord’s written consent and shall be made during the hours of 12:00 a.m. to 5:00 a.m. and 6:00 p.m. to 11:59 p.m., Monday through Friday, or at any time on Saturday or Sunday, unless otherwise agreed in writing by Landlord.  Deliveries during normal office hours shall be limited to normal office supplies and other small items.  No deliveries shall be made which impede or interfere with other tenants or the operation of the Building.

9.Floor Load.  Tenant shall not place a load upon any floor of the Premises which exceeds the load per square foot which such floor was designed to carry and which is allowed by law.  Prior to delivery of any heavy object to the Building, Tenant shall notify Landlord of such object’s specifications and contemplated location in order that Landlord may take action to prevent structural load damage to the Building.  Landlord shall have the right to prescribe the weight, size and position of all equipment, materials, furniture or other property brought into the Building.  Heavy objects shall, if considered necessary by Landlord, stand on such platforms as determined by Landlord to be necessary to properly distribute the weight, which platforms shall be provided at Tenant’s sole cost and expense.  Tenant shall be responsible for all structural engineering required to determine structural load.  Business machines and mechanical equipment belonging to Tenant which cause noise or vibration that may be transmitted to the structure of the Building or to any space therein to such degree as to be objectionable to Landlord or to any tenants in the Building, shall be placed and maintained by Tenant, at Tenant’s sole cost and expense, on vibration eliminators or other devices sufficient to eliminate noise or vibration.  The persons employed to move such equipment in or out of the Building must be acceptable to Landlord.  Landlord will not be responsible for loss of, or damage to, any such equipment or other property from any cause, and all damage done to the Building by maintaining or moving such equipment or other property shall be repaired at the expense of Tenant.

10.No Waste.  Tenant shall not use any method of heating and air conditioning other than that supplied by Landlord.  Further, Tenant shall not waste electricity,

water or air conditioning and agrees to cooperate fully with Landlord to assure the most effective operation of the Building’s heating and air conditioning and to comply with any governmental energy-saving rules, laws or regulations of which Tenant has actual notice.  Tenant shall keep corridor doors closed, and shall close window coverings at the end of each business day. 

11.Building Identification.  Landlord reserves the right, exercisable without notice and without liability to Tenant, to change the name and address of the Building and/or any other part of the Project.

12.Building Access.  Landlord reserves the right to exclude from the Building between the hours of 12:00 a.m. to 7:00 a.m. and 6:00 p.m. to 11:59 p.m., Monday through Friday, and on Saturday, Sunday and holidays, any person not having a Building issue key and is not identified on the daily access list.  Tenant shall be responsible for all persons for whom it requests passes and shall be liable to Landlord for all acts of such persons.  Landlord may prevent access to the Project or any part thereof in case of invasion, mob, riot, public excitement or other commotion.  Landlord may exclude or expel from the Project or any part thereof any person who, in Landlord’s judgment, is intoxicated or under the influence of liquor or drugs or is in violation of any of the rules and regulations of the Project.  Landlord shall not be liable for damages for any error with regard to the admission to or exclusion from the Project or any part thereof of any person.

13.Building Security.  Before Tenant and the Tenant Parties leave the Premises each day, Tenant shall (a) close and lock the doors of its Premises, (b) shut off all water faucets and other utilities, (c) draw or lower window coverings, and (d) turn out all lights.  Tenant shall be responsible for any damage or injuries sustained by other tenants or occupants of the Building or by Landlord for noncompliance with this rule.

14.Outside Services.  Tenant shall not obtain for use on the Premises, drinking water, food, beverage, towel or other similar services or accept barbering or bootblacking service upon the Premises, except as such hours and under such regulations as may be fixed by Landlord.  Canvassing, soliciting and distribution of handbills or any other written material, and peddling in the Building are prohibited, and Tenant shall cooperate to prevent such activities.

15.Lavatories.  The toilet rooms, toilets, urinals, wash bowls and other apparatus shall not be used for any purpose other than that for which they were constructed and no foreign substance of any kind whatsoever shall be thrown therein.  The expense of any breakage, stoppage or damage resulting from the violation of this rule shall be borne by the tenant who, or whose Tenant Parties, shall have caused it.

16.Solicitation.  Tenant shall not make any room-to-room solicitation of business from other tenants in the Project or any part thereof.

17.Electronic Devices.  Tenant shall not install any radio or television antenna, loudspeaker or other devices on the roof or exterior walls of the Building.  Tenant shall not interfere with radio or television broadcasting or reception from or in the Building or elsewhere.

18.Trash Disposal.  Tenant shall store all its trash and garbage within the Premises or in other facilities provided by Landlord.  Tenant shall not place in any trash box or receptacle any material which cannot be disposed of in the ordinary and customary manner of trash and garbage disposal.  All garbage and refuse disposal shall be made in accordance with directions issued from time to time by Landlord. 

19.Prohibited Uses.  The Premises shall not be used for (a) the keeping of any bicycles, motorcycles or animals of any kind, or (b) lodging, or (c) for manufacturing of any kind; nor shall the Premises be used for any illegal purpose.  No cooking or heating of food is permitted on the Premises, excepting therefrom microwave ovens and equipment for brewing coffee, tea, hot chocolate and similar beverages.  Such cooking and heating devices and their use should be approved by Underwriters Laboratories in accordance with all applicable insurance regulations and federal, state, county and city laws, codes, ordinances, rules and regulations.  Tenant shall not install, maintain or operate upon the Premises any vending machines without the written consent of Landlord, which consent shall not be unreasonably withheld.

20.Prohibited Equipment.  Tenant shall not use in any space or in the public halls of the Project any hand truck except those equipped with rubber tires and side guards or such other material- handling equipment as Landlord may approve.  Tenant shall not bring any other vehicles of any kind into the Building.

21.Safety Procedures.  Tenant shall comply with all safety, fire protection and evacuation procedures and regulations established by Landlord or any governmental agency.

22.Premises Security.  Tenant assumes full responsibility for protecting its space from theft, robbery and pilferage, which includes keeping doors locked and other means of entry to the Premises closed and secure.  Landlord shall not in any way be responsible to Tenants or any Tenant Party, for any loss of property from the Premises or public areas or for any damage to any property thereon from any cause whatsoever.

23.Building Management.  Tenant’s requirements will be attended to only upon appropriate application to the Building management office by an authorized individual.  Employees of Landlord shall not perform any work or do anything outside of their regular duties unless under special instructions from Landlord, and no employee of Landlord will admit any person (Tenant or otherwise) to any office without specific instructions from Landlord.

24.Waiver.  Landlord may waive any one or more of these Rules and Regulations for the benefit of Tenant or any other tenant, but no such waiver by Landlord shall be construed as a waiver of such Rules and Regulations in favor of Tenant or any other tenant, nor prevent Landlord from thereafter enforcing any such Rules and Regulations against any or all of the tenants of the Building.

25.Integration.  These Rules and Regulations are in addition to, and shall not be construed to in any way modify or amend, in whole or in part, the terms, covenants, agreements and conditions of the Lease.

26.Additional Regulations.  Landlord reserves the right to make such other and reasonable rules and regulations as, in its judgment, may from time to time be needed for

safety and security, for care and cleanliness of the Project of any part thereof and for the preservation of good order therein.  Tenant agrees to abide by all such Rules and Regulations hereinabove stated and any additional rules and regulations which are adopted and delivered to Tenant in writing. 

27.Observance of Rules.  Tenant shall be responsible for the observance of all of the foregoing rules by Tenant’s employees, agents, clients, customers, invitees, licensees and guests.

28.Parking Facilities.  The following rules and regulations shall govern use of the parking facilities within the Common Areas appurtenant to the Project (such parking facilities being collectively referred to hereinafter as the “Parking Area”).

28.1Persons using the Parking Area shall obey all signs and shall park only in areas designated for vehicle parking within painted stall lines.  Tenant’s parking spaces shall be used only for parking vehicles no longer than full-sized passenger automobiles.  Tenant shall not permit any vehicle that belongs to or is controlled by Tenant, its agents, employees, invitees, licensees and visitors, to be loaded, unloaded or parked in areas other than those designated by Landlord or its parking operator for such activities.  No maintenance, washing, waxing or cleaning of vehicles shall be permitted in the Parking Area.  Unless otherwise instructed, each person using the Parking Area shall park and lock his or her own vehicle.  Neither Landlord nor its parking operator shall be liable for damage to any vehicle, injury to any person or loss of any property, all of which risks are assumed by the person using the Parking Area.  Parking pursuant to this Lease is intended as a license only, and no bailment is intended or created hereby.  Tenant shall abide by those rules promulgated by Landlord which provide for tandem parking.  No overnight or extended term storage of any vehicles or other object shall be permitted.

28.2Persons using the Parking Area shall comply with any parking identification system established by Landlord or its parking operator.  Such a system may include the validation of visitor parking, at the validation rate applicable to visitor parking from time to time as set by Landlord or its parking operator.  Parking stickers or other identification devices supplied by Landlord shall remain the property of Landlord.  Such devices shall not be transferable, and any such device in the possession of an unauthorized holder may be retained by Landlord and declared void.  Upon the loss or obliteration of a parking identification device, Tenant shall pay such reasonable replacement charge as may be established by Landlord or its parking operator.  Upon the termination of parking privileges, all parking identification devices supplied by Landlord shall be returned to Landlord.  Landlord may refuse the sale of monthly stickers or other parking identification devices to any tenant or person and/or his agents or representatives who willfully refuse to comply with these Rules and Regulations and all unposted city, state or federal ordinances, laws, or agreements.  Loss or theft of parking identification devices from automobiles must be reported to the garage manager immediately, and a lost or stolen report must be filed by the customer at that time.  Landlord may exclude any car from the parking facilities that does not have a identification device.  Any parking identification devices reported lost or stolen found on any unauthorized car will be confiscated and the illegal holder will be subject to prosecution.  Lost or stolen devices found by the purchaser must be reported to the parking facility office immediately to avoid confusion.

28.3The speed limit within all parking areas shall be five (5) miles per hour. 

28.4Landlord reserves the right to modify, redesign or redesignate uses permitted in the Parking Area or any portion thereof, to relocate parking spaces from floor to floor, from one portion of the Parking Area to another or to reasonably adjacent offsite locations, and to allocate parking spaces between compact and standard sizes from time to time, as long as the same comply with applicable laws and ordinances.  Reserved parking spaces shall be clearly and prominently marked as such by Landlord.  But neither Landlord nor its parking operator shall be liable or responsible for the failure of persons to observe such markings or to obey other rules and regulations, agreements, laws or ordinances applicable to the Parking Area.  Without limiting the generality of the foregoing, Landlord shall not be obligated to tow any violator’s vehicle, or to declare a default under or terminate the lease of any other tenant of the Building, on account of any such failure.  If for any reason Landlord is unable to provide to Tenant all or any portion of its parking spaces or Tenant is unreasonably denied access thereto during the initial term of this Lease or any renewal or extension hereof, such fact shall not be a default by Landlord or permit Tenant to terminate this Lease, either in whole or in part, but Tenant’s obligation to pay rental for any parking space which is not provided by Landlord shall be abated for so long as Tenant does not have the use of such parking space, in full settlement of all claims that Tenant might otherwise have against Landlord by reason of Landlord’s failure or inability to provide Tenant with such parking space.

Tenant shall be responsible for the compliance with all of the foregoing rules and regulations by Tenant and Tenant Parties.  Landlord may refuse to permit any person who violates any such rules and regulations to have access to the Project or any part thereof.  Landlord reserves the right from time to time to modify the rules and regulations set forth herein, including, without limitation, to adopt and modify such rules and regulations applicable to the Parking Area, as it deems necessary for the proper operation.

EXHIBIT E

611 GATEWAY BOULEVARD

FORM OF TENANT'S ESTOPPEL CERTIFICATE

The undersigned, as Tenant under that certain Office Lease (the "Lease") made and entered into as of ___________, 20__ by and between _______________, as Landlord, and the undersigned, as Tenant, for Premises on the ______________ floor(s) of the office building located at ______________, certifies as follows:

1.Attached hereto as Exhibit A is a true and correct copy of the Lease and all amendments and modifications thereto.  The documents contained in Exhibit A represent the entire agreement between the parties as to the Premises.

2.The undersigned currently occupies the Premises described in the Lease, the Lease Term commenced on __________, and the Lease Term expires on ___________, and the undersigned has no option to terminate or cancel the Lease or to purchase all or any part of the Premises, the Building and/or the Project.

3.Base Rent became payable on ____________.

4.The Lease is in full force and effect and has not been modified, supplemented or amended in any way except as provided in Exhibit A.

5.Tenant has not transferred, assigned, or sublet any portion of the Premises nor entered into any license or concession agreements with respect thereto except as follows:

6.Tenant shall not modify the documents contained in Exhibit A without the prior written consent of Landlord's mortgagee.

7.All monthly installments of Base Rent, all Additional Rent and all monthly installments of estimated Additional Rent have been paid when due through ___________.  The current monthly installment of Base Rent is $_____________________.

8.All conditions of the Lease to be performed by Landlord necessary to the enforceability of the Lease have been satisfied and Landlord is not in default thereunder.  In addition, the undersigned has not delivered any notice to Landlord regarding a default by Landlord thereunder.

9.No rental has been paid more than thirty (30) days in advance and no security has been deposited with Landlord except the Security Deposit in the amount of $_____________________ as provided in the Lease. 

10.As of the date hereof, there are no existing defenses or offsets, or, to the undersigned's knowledge, claims or any basis for a claim, that the undersigned has against Landlord.

11.If Tenant is a corporation, limited liability company, partnership or limited liability partnership, each individual executing this Estoppel Certificate on behalf of Tenant hereby represents and warrants that Tenant is a duly formed and existing entity qualified to do business in California and that Tenant has full right and authority to execute and deliver this Estoppel Certificate and that each person signing on behalf of Tenant is authorized to do so.

12.There are no actions pending against the undersigned under the bankruptcy or similar laws of the United States or any state.

13.Other than in compliance with all applicable laws and incidental to the ordinary course of the use of the Premises, the undersigned has not used or stored any hazardous substances in the Premises.

14.All tenant improvement work to be performed by Landlord under the Lease has been completed in accordance with the Lease and has been accepted by the undersigned and all reimbursements and allowances due to the undersigned under the Lease in connection with any tenant improvement work have been paid in full.

The undersigned acknowledges that this Estoppel Certificate may be delivered to Landlord or to a prospective mortgagee or prospective purchaser, and acknowledges that said prospective mortgagee or prospective purchaser will be relying upon the statements contained herein in making the loan or acquiring the property of which the Premises are a part and that receipt by it of this certificate is a condition of making such loan or acquiring such property.

Executed at ______________ on the ____ day of ___________, 20__.

"Tenant":

EXHIBIT F

611 GATEWAY BOULEVARD

STANDARDS FOR UTILITIES AND SERVICES

1.Elevators.  Provide non-attended passenger elevators to and from the floor(s) on which the Premises are located.  Landlord may limit the number of elevators operating outside normal business hours.

2.HVAC.  On Monday through Friday, except holidays, from 7:00 a.m. to 6:00 p.m., ventilate the Premises and furnish air conditioning or heating on such days and hours, in temperatures and amounts which in Landlord’s good faith judgment are reasonably required for comfortable occupancy of the Premises under normal business operations.  If Tenant requires air conditioning during other hours, Landlord will furnish same through an access system provided to Tenant at the Premises, if available, or otherwise as specified in a written request of Tenant delivered to the Building management office before noon on the preceding business day.  For this service Tenant will pay Landlord, upon receipt of Landlord’s statement, the charge at an hourly rate determined by Landlord from time to time, which is currently $192.37 for full HVAC and $85.82 for fans only per hour.  Tenant agrees that neither Tenant nor any Tenant Party shall at any time enter mechanical installations or facilities of the Building or adjust, tamper with, touch or otherwise in any manner affect said installations or facilities.  The cost of maintenance and service calls to adjust and regulate the air conditioning system shall be charged to Tenant if the need for maintenance work results from either Tenant’s adjustment of room thermostats or Tenant’s failure to comply with Landlord’s rules governing the temperature within the Premises.

3.Lighting.  Furnish electric lighting for all public areas and special service areas of the Building as Landlord determines in good faith to be reasonable and standard, including replacement of Building standard lights, bulbs and tubes.

4.Electrical Service.  Subject to the limitation of this Paragraph 4, furnish electrical service to the Premises, including providing and installing all Building standard replacement lighting tubes.  If Tenant uses more electrical power than Landlord in good faith considers reasonable or normal for office use, Tenant will pay Landlord on a monthly basis the cost of such excess power consumed by Tenant.  Consumption will be determined, at Landlord’s election, either (a) by a survey performed by a reputable consultant selected by Landlord, or (b) through separate meters or submeters installed, maintained and read by Landlord at Tenant’s cost.  For purposes of this Paragraph 4 only, “month” and “monthly” shall mean any billing period used by the utility or other power provider supplying electricity.  All installations of electrical fixtures, appliances and equipment within the Premises shall be subject to Landlord’s prior approval, and if they affect the temperature or humidity otherwise maintained, Landlord may, at Tenant’s sole cost and expense (to be paid within (30) days after delivery of written demand supported by invoices or other reasonably satisfactory evidence), install supplemental air conditioning units.  Tenant’s use of electricity shall never exceed Tenant’s share of the capacity of existing feeders to the Building or of the risers, wiring installations and transformers serving the floor(s) containing the Premises.  Landlord shall provide up to 3.5 watts per usable square foot (demand) of riser and floor panel electrical capacity averaged over the floor being serviced.  Tenant shall be allocated an approximate 2.0 watts per usable square foot for power and 1.5

watts per usable square foot for lighting.  Any risers or wiring necessary to meet Tenant’s excess electrical requirements will be installed by Landlord on Tenant’s request, at Tenant’s sole cost and expense (to be paid in advance), but only if in Landlord’s good faith belief they are necessary and will not cause damage to the Building or a dangerous condition, entail excessive or unreasonable alterations, repairs or expense, or disturb other occupants. 

5.Water.  Provide toilet facilities, water for lavatory and toilet purposes, cold water for drinking and tepid water for lavatory purposes, all at points of supply provided for general use of tenants in the Building through fixtures installed by Landlord or by Tenant with Landlord’s consent.

6.Janitorial.  Provide janitorial service to the Premises on business days and other cleaning services as Landlord determines to be reasonably required and all of which are consistent with the services being provided in the Comparable Buildings.  Tenant will pay Landlord the full cost attributable to any extraordinary janitorial or cleaning services which the Premises may require.

7.Maintenance of Non-Building Standard Items.  Maintenance and service costs necessary for non-building standard items in the Premises shall be the responsibility of Tenant.  As used in this paragraph, non-building standard items shall include, without limitation, heat pumps, condenser pumps, sinks and associated drain pipes, faucets, hot water heaters, garbage disposals, dishwashers, refrigerators, ice makers, air conditioning units, projection screens and associated wiring and switching, incandescent downlight or wallwash fixtures and lamps, floor electrical outlets and power poles.

8.Security Services.  Provide Building security personnel twenty-four (24) hours per day, seven (7) days per week, fifty-two (52) weeks per year and a card access system which allows access to individual office floors twenty-four (24) hours per day, seven (7) days per week, fifty-two (52) weeks per year, all of which shall be provided by Landlord in its sole and absolute discretion.  Notwithstanding Landlord’s providing security, Tenant waives any claim against Landlord with respect to any loss by theft or any other damage suffered or incurred by Tenant in connection with any entry into the Premises or any other breach of security with respect to the Premises or the Building, except due to the gross negligence or willful misconduct of Landlord.

Landlord reserves the right to adopt reasonably, nondiscriminatory modifications and additions to these standards, which Landlord shall promptly deliver to Tenant in writing.

EXHIBIT G

ACCEPTABLE FORMS OF INSURANCE CERTIFICATE

EXHIBIT H

FORM OF LETTER OF CREDIT

(Letterhead of a money center bank

acceptable to the Landlord)

______________, 200__

________________________

________________________

________________________

________________________

Gentlemen:

We hereby establish our Irrevocable Letter of Credit and authorize you to draw on us at sight for the account of [INSERT TENANT NAME] ("Applicant"), a [PLEASE PROVIDE], the aggregate amount of _______________ and ____ Dollars ($_______________).

Funds under this Letter of Credit are available to the beneficiary hereof as follows:

Any or all of the sums hereunder may be drawn down at any time and from time to time from and after the date hereof by BXP 611 GATEWAY CENTER LP, a Delaware limited partnership ("Beneficiary") when accompanied by this Letter of Credit and a written statement signed by a representative of Beneficiary, (i) certifying that Beneficiary is otherwise allowed to draw down on the Letter of Credit pursuant to the terms of that certain office lease by and between Beneficiary and Applicant dated [insert lease date], as amended (collectively, the "Lease"), (ii) certifying that Beneficiary is entitled to draw down the full amount of letter of credit no. ___________ as the result of the filing of a voluntary petition under the U.S. Bankruptcy Code or a State Bankruptcy Code by the tenant under the Lease, which filing has not been dismissed at the time of this drawing, or (iii) certifying that Beneficiary is entitled to draw down the full amount of letter of credit no. ___________ as the result of an involuntary petition having been filed under the U.S. Bankruptcy Code or a State Bankruptcy Code against the tenant under the Lease, which filing has not been dismissed at the time of this drawing.

This Letter of Credit is transferable in its entirety.  Should a transfer be desired, such transfer will be subject to the return to us of this advice, together with written instructions.

The amount of each draft must be endorsed on the reverse hereof by the negotiating bank.  

We hereby agree with you that if drafts are presented to the [bank name] under this Letter of Credit at or prior to 11:00 a.m. time, on a business day, and provided that such drafts presented conform to the terms and conditions of this Letter of Credit, payment shall be initiated by us in immediately available funds by our close of business on the succeeding business day. If drafts are presented to [bank name] under this Letter of Credit after 11:00 a.m. time, on a business day, and provided that such drafts conform with the terms and conditions of

this Letter of Credit, payment shall be initiated by us in immediately available funds by our close of business on the second succeeding business day. As used in this Letter of Credit, "business day" shall mean any day other than a Saturday, Sunday or a day on which banking institutions in the state of California are authorized or required by law to close. If the expiration date for this Letter of Credit shall ever fall on a day which is not a business day then such expiration date shall automatically be extended to the date which is the next business day. 

We hereby engage with you that drafts drawn under and in compliance with the terms and conditions of this Letter of Credit will be duly honored by us if presented at our offices located at attention: (or at such other office of the bank as to which you have received written notice from us by registered mail, courier service or hand delivery, as being the applicable such address) on or before the then current expiration date.  We agree to notify you in writing by registered mail, courier service or hand delivery, of any change in such address.

Presentation of a drawing under this Letter of Credit may be made on or prior to the then current expiration date hereof by hand delivery, courier service, overnight mail, or facsimile. Presentation by facsimile transmission shall be by transmission of the above required sight draft drawn on us together with this Letter of Credit to our facsimile number, (___) ________ attention: the manager, standby letter of credit department, with telephonic confirmation of our receipt of such facsimile transmission at our telephone number (___) ________ or to such other facsimile or telephone numbers, as to which you have received written notice from us as being the applicable such number). We agree to notify you in writing, by registered mail, courier service or hand delivery, of any change in such direction. Any facsimile presentation pursuant to this paragraph shall also state thereon that the original of such sight draft and Letter of Credit are being remitted, for delivery on the next business day, to [bank name] at the applicable address for presentment pursuant to the paragraph preceding this one.

This Letter of Credit shall expire on ______________.

Notwithstanding the above expiration date of this Letter of Credit, the term of this Letter of Credit shall be automatically renewed for successive, additional one (1) year periods unless, at least sixty (60) days prior to any such date of expiration, the undersigned shall give written notice to Beneficiary, by certified mail, return receipt requested and at the address set forth above or at such other address as may be given to the undersigned by Beneficiary, that this Letter of Credit will not be renewed. (FINAL EXPIRATION DATE NOT LESS THAN 120 DAYS FOLLOWING LEASE EXPIRATION DATE)

This Letter of Credit is governed by the Uniform Customs and Practice for Documentary Credits (1993 Revision), International Chamber of Commerce Publication 500.