$963.79 Uses in Condition of the First Expansion Premises; Landlords First Expansion Premises Work Clause

Condition of the First Expansion Premises; Landlords First Expansion Premises Work from Amendment to Lease

This FIRST AMENDMENT TO LEASE (this Amendment) is entered into and effective as of the 19th day of October, 2015 (the First Amendment Effective Date) by and between RIVERWORKS WATERTOWN HOLDINGS, LLC, a Delaware limited liability company, as landlord (Landlord), as successor-in-interest to Farley White Aetna Mills, LLC, having an address for purposes hereof at One Market Plaza, Spear Tower, Suite 4125, San Francisco, California 94105, and MIMECAST NORTH AMERICA, INC., a Delaware corporation, as tenant (Tenant), having an address for purposes hereof at 480 Pleasant Street, Watertown, Massachusetts 02472.

Condition of the First Expansion Premises; Landlords First Expansion Premises Work. Tenant shall accept delivery of the First Expansion Premises upon Landlords delivery thereof with Landlords First Expansion Premises Work and Landlords Additional First Expansion Premises Work (as defined herein below) Substantially Complete, and Landlord shall have no obligation to perform any construction or other work therein or to otherwise prepare the First Expansion Premises for Tenants occupancy, except Landlord shall, following the First Amendment Effective Date: (a) at Landlords sole cost and expense, perform the work described in Exhibit A attached hereto and incorporated herein by reference, other than any work described therein as being the responsibility or obligation of Tenant (Landlords First Expansion Premises Work); and (b) perform certain additional work to the First Expansion Premises to prepare the same for Tenants occupancy (the Landlords Additional First Expansion Premises Work), subject to and in accordance with the terms and provisions contained in Exhibit B attached hereto and incorporated herein by reference. Landlord agrees to use commercially reasonable efforts to complete Landlords First Expansion Premises Work and Landlords Additional First Expansion Premises Work on or before March 1, 2016, and Tenant shall provide Landlord with reasonable access to the Premises for such purposes. In the event Landlords First Expansion Premises Work and Landlords Additional First Expansion Premises Work is not Substantially Complete (as hereinafter defined) on or before March 1,2016, Landlord shall have no liability therefor (except as expressly provided in this Amendment), and Tenant shall accept delivery of the First Expansion Premises when the same is delivered by Landlord with Landlords First Expansion Premises Work and Landlords Additional First Expansion Premises Work Substantially Complete. In the event Landlords First Expansion Premises Work and Landlords Additional First Expansion Premises Work are not Substantially Complete on or before May 1, 2016, as extended by each day of Tenant Delay (as defined in Exhibit B) and/or Force Majeure (the Rent Credit Trigger Date), then Landlord shall issue a credit to Tenant in the amount of $963.79 for each day from and after the Rent Credit Trigger Dale until the date upon which Landlords First Expansion Premises Work and Landlords Additional First Expansion Premises Work are Substantially Complete, with such credit to be applied towards Tenants installment(s) of Base Rent for the First Expansion Premises first due hereunder until fully credited. For purposes hereof, Substantially Complete shall mean Landlords First Expansion Premises Work and Landlords Additional First Expansion Premises Work are completed in substantial accordance with the Construction Drawings (as defined in Exhibit B hereto) and a certificate of occupancy (or such other governmental approval which lawfully permits Tenant to use the First Expansion Premises for the Permitted Uses) has been issued therefor, except to the extent that such certificate of occupancy or other approval cannot be issued due to incompletion of or defects in any Tenant First Expansion Premises Work, Notwithstanding the foregoing, Landlords First Expansion Premises Work and Landlords Additional First Expansion Premises Work shall be deemed Substantially Complete notwithstanding that certain work items thereof remain incomplete and/or require remedial work, provided that the incompletion of or defects in such items could not reasonably be expected to materially and adversely interfere with either (i)the performance of any Tenant First Expansion Premises Work (as defined in the Work Letter) theretofore approved by Landlord, if any, or (ii) use and occupancy of the First Expansion Premises for the Permitted Uses (subject to completion by Tenant of any Tenant First Expansion Premises Work).