does not so countersign the notice, ​ and ​ shall work together in good faith to agree upon and mutually execute an acceptable Notice of Lease Term Dates and Base Rent.

Base Rent became payable on .

Preliminary Base Rent..................................................................................................... [Exhibit B]

You were paid your base salary through ​ (less customary tax withholdings) and your company benefits continued through such date. Contingent upon your execution and non-revocation of the attached General Release and in accordance with [Section 5.6] of your employment agreement dated ​, in addition to the base salary payments described above, you are entitled to the following compensation:

Execution of Release Agreement upon Termination. As a condition of entering into this Agreement and receiving the benefits under [Sections 4(a) and 4(b)])], the Employee agrees to execute and not revoke a general release of claims within forty-five (45) days following the termination of employment with the Company.

j CALCULATION OF INITIAL BASE RENT

Monthly Rent. The Tenant shall make monthly installments payments of ​ (the “Rent”) to the Landlord, payable in advance on the 1st day of each month.

Additional Rent. ​ shall pay to ​ as Additional Rent throughout the Term, the following:

Option Rent. The annual Rent payable by Tenant during the Option Term (the "Option Rent XE "Option Rent" ") shall be equal to the "Fair Rental Value," as that term is defined below, for the Premises as of the commencement date of the Option Term. The "Fair Rental Value XE "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 twelve (12) month period preceding the first day of the Option Term), are leasing non-sublease, non-encumbered, non-equity space which is not significantly greater or smaller in size than the subject space, with a comparable level of improvements (excluding any property that Tenant would be allowed to remove from the Premises at the termination of the Lease), for a comparable lease term, in an arm's length transaction, which comparable space is located in the "Comparable Buildings," as that term is defined in this [Section 2.2.2], below (transactions satisfying the foregoing criteria shall be known as the " XE "Comparable Transactions" Comparable Transactions"), taking into consideration the following concessions (the " XE "Concessions" Concessions"): # rental abatement concessions, if any, being granted such tenants in connection with such comparable space; # 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 subject space (other than improvements installed by Tenant at Tenant’s sole cost and expense), 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/lab user other than Tenant; and # 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 the fact that Landlord is or is not required to pay a real estate brokerage commission in connection with Tenant's exercise of its right to extend the Lease Term, or the fact that landlords are or are not paying real estate brokerage commissions in connection with such comparable space. The Concessions 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. The term “ XE “Comparable Buildings” Comparable Buildings” shall mean the Building and those other life sciences buildings which are comparable to the Building in terms of age (based upon the date of completion of construction or major renovation to the building), quality of

Rent Abatement. If Landlord or Tenant does not elect to terminate this Lease under Paragraph 25.3 or Paragraph 25.4, this Lease shall remain in full force and effect provided that Tenant shall be entitled to a reduction of Base Rent and Tenant’s Proportionate Share of Operating Expenses in proportion that the areas of the Premises rendered untenantable bears to the total rentable area of the Premises during the period beginning with the date such rentable area becomes untenantable and Tenant ceases to use such rentable area for the normal conduct of its business and ending five (5) Business Days after Substantial Completion of Landlord’s Restoration Work. For purposes of this Paragraph 25, the term “Substantial Completion” or “Substantially Complete” shall have the same meaning as provided in the Tenant Improvement Agreement with respect to Substantial Completion of the Base Building Improvements.