Upon Tenant’s exercise of the 14th Floor Expansion Option, Landlord and Tenant shall enter into an amendment to this Lease adding the 14th Floor Expansion Space to the Premises on all the terms and conditions set forth in this Lease as to the Premises then demised under the Lease, except that # the term of the Lease as to the 14th Floor Expansion Space shall commence on ​, or, if later, the date the 14th Floor Expansion Space is actually delivered to Tenant, # the annual fixed rent payable by Tenant for the 14th Floor Expansion Space shall be the fair market rent for the 14th Floor Expansion Space, as set forth in Landlord’s Option Notification or as determined by the appraisal procedure (as applicable), # Tenant’s Proportionate Share for Taxes as to the 14th Floor Expansion Space and Tenant’s Proportionate Share for Operating Expenses as to the 14th Floor Expansion Space shall be established based on the then rentable square footage of the 14th Floor Expansion Space; # the “Tax Base” under [Section 4.01(b)] of the Lease as to the 14th Floor Expansion Space shall be the fiscal tax year in which the 14th Floor Expansion Space is added to the Lease, # the “Operating Expense Base” under [Section 4.05(c)] of the Lease as to the 14th Floor Expansion Space shall be the calendar year in which the 14th Floor Expansion Space is added to this Lease, # Tenant shall take the 14th Floor Expansion Space in its then “as-is” condition (unless the current fair market terms for the 14th Floor Expansion Space include a tenant improvement allowance, in which event Tenant shall receive a tenant improvement allowance for improvements to the 14th Floor Expansion Space and the annual fixed rent set forth in Landlord’s Option Notification shall take into account such tenant improvement allowance) and # the renewal option provided for in [Article 22] of the Lease shall be inapplicable to the 14th Floor Expansion Space and the provisions of Paragraph l.d. below shall instead apply with regard to the renewal of the Lease as to the 14th Floor Expansion Space.

Amount. As an inducement to Tenant’s entering into this Fourth Amendment, Landlord shall, subject to [Section 4(c)] below and the last sentence of this [Section 4(a)], provide to Tenant a special tenant improvement allowance in an amount up to ​ (the “ES Allowance”) to be used by Tenant solely for costs incurred by Tenant for Tenant’s ES Fitout. For the purposes hereof, the cost to be so reimbursed by Landlord shall not include: # the cost of acquiring or installing any of Tenant’s Property (hereinafter defined), including without limitation telecommunications and computer equipment and all associated wiring and cabling, any de-mountable decorations, artwork and partitions, signs, and trade fixtures, # any fees paid to Tenant, any Affiliate or Successor, and # any so-called “soft costs”; provided, however, notwithstanding the foregoing, up to ​ of the ES Allowance may be used for Tenant’s architectural, engineering and consultant fees and design and permitting costs and the cost of Tenant’s wiring and cabling relating to Tenant’s ES Fitout.

If Landlord determines at any time that changes in the Final TI Working Drawings or in any other aspect of the Approved TI Plans relating to any item of Landlord's TI Work are required as a result of applicable law or governmental requirements, or are required as a result of unanticipated conditions encountered in the course of construction, then Landlord shall promptly # advise Tenant of such circumstances and # at Tenant's sole cost and expense, subject to Landlord's payment of the Tenant Improvement Allowance and, to the extent requested by Tenant, the Additional TI Allowance, cause revised Final TI Working Drawings to be prepared by the Architect and submitted to Tenant, for Tenant's approval, which shall not be unreasonably withheld. Failure of Tenant to deliver to Landlord written notice of disapproval and specification of such required changes on or before any deadline reasonably specified by Landlord (which shall not be less than three (3) business days after delivery thereof to Tenant) shall constitute and be deemed to be a Tenant Delay to the extent Landlord is delayed in completing Landlord’s TI Work.

Amount of ​’s Contribution. ​ shall pay, as ​’s contribution to the payment of the ​ Improvement Costs (“​’s Contribution”), the sum of # the amount of the ​ Improvement Costs in excess of the ​ Improvement Allowance up to, but not to exceed, the Final TI Cost Budget (subject to any adjustment to the Final TI Cost Budget to account for the cost of Changes to the ​ Improvements approved by ​ and ​ as provided for in [Section 2.7(c)] above,) plus # any increases in ​ Improvement Costs resulting from ​ Delays plus # any amount payable by ​ pursuant to [Section 2.8(d)] above. In addition to the ​ Improvement Allowance, ​ shall be responsible for any ​ Improvement Costs, if any, in excess of ​’s Contribution.

Tenant Improvement Milestone Schedule

Tenant Funds. Any additional funds required to complete the cost of the work, that are in excess of or elected by the Tenant to be used in place of the Tenant Improvement Allowance and the Additional TI Allowance, shall be considered "Tenant Funds." The total cost to construct the Tenant Improvements as managed by Landlord and the Project Manager under this Work Letter shall be the "Project Budget." Landlord understands that at the time of the agreed upon Guaranteed Maximum Price (GMP), the Tenant Funds amount is an estimate and exact costs will not be known until project closeout. Tenant is required, at the time of agreement of the GMP, to provide a purchase order to the Landlord for the full estimated amount of the Tenant Funds. In the event the Tenant Funds at project closeout are less than the amount agreed upon within the Project Budget, Landlord will only bill Tenant for the Tenant Funds that have been utilized. In the event the Tenant Funds exceed the amount agreed upon within the Project Budget, through added scope changes, the Tenant shall provide additional purchases orders to the Landlord, which will be included in the Tenant Change Request process that the Landlord’s representative administers.

Application of Portions of Allowance to Annual Fixed Rent. Tenant shall be entitled to apply up to ​ of the Landlord’s Allowance described in Paragraph 5.c.i., above toward the annual fixed rent due for the Premises during the period commencing ​ and ending ​ (the “Rent Period”). Within thirty (30) days after Substantial Completion of the Tenant Improvements and provided that there remain unused Landlord Allowance dollars from the Landlord’s Allowance, Tenant shall inform Landlord in writing of Tenant’s desire to apply such unused amounts to annual fixed rent in accordance with the provisions of this Paragraph 5.c.ii. Tenant’s failure to provide such notice shall be deemed Tenant’s election not to use any such remaining portion of the Allowance for free rent.

2 TENANT IMPROVEMENT LEED CERTIFICATION

Re: Outline Specification – Tenant Improvement

Compliance. The Tenant Improvement Work shall comply in all respects with # all Applicable Laws; # all applicable standards of the American Insurance Association (formerly, the National Board of Fire Underwriters) and the National Electrical Code; and # all applicable building material manufacturer’s specifications. Without limiting the foregoing, if, as a result of Tenant’s performance of the Tenant Improvement Work, Landlord becomes required under Applicable Laws to perform any inspection or give any notice relating to the Premises or the Tenant Improvement Work, or to ensure that the Tenant Improvement Work is performed in any particular manner, Tenant shall comply with such requirement on Landlord’s behalf and promptly thereafter provide Landlord with reasonable documentation of such compliance.