Co-Tenant Agreement Amendment, dated February 25, 2025, by and between International Stem Cell Corporation and S Real Estate Holdings, LLC

Co-Tenant Agreement Amendment

This Co-Tenant Agreement Amendment is hereby made as of February 25, 2025, into by and between International Stem Cell Corporation (hereinafter referred to as "ISCO") and S Real Estate Holdings, LLC (hereinafter referred to as "SREH"). Collectively, ISCO and SREH are referred to as the "Parties".

WHEREAS, On October 26, 2021, PARTIES have entered into a lease agreement (the "Lease") with Rehco Holdings (the "Landlord") for the purpose of establishing joint corporate headquarters at 9745 Businesspark Ave, San Diego, CA (the "Premises"); and

WHEREAS, On December 15, 2021, ISCO and SREH have entered into a co-tenant agreement for the purpose of setting forth the terms for allocating each Party's share of expenses incidental to the PARTIES' leasing of the Premises; and ISCO and SREH desire to amend the co-tenant agreement as described in this amendment.

NOW THEREFORE, the PARTIES have agreed to the following allocations in the Exhibit A of the Co-Tenant Agreement effective January 1, 2025:

Space Allocation: ISCO-5445 sq.ft., SREH- 1815 sq.ft.

Base Rent Allocation: ISCO - 75% SREH-25%

Cost Rent Allocation: ISCO - 75% SREH-25%

ISCO pays its rent directly to Rehco Holdings.

IN WITNESS WHEREOF, the Parties have executed this letter by their duly authorized agents on the dates indicated below.

EXHIBIT A

Space Allocation: ISCO - 5445 sq.ft., SREH- 1815 sq.ft.

Base Rent Allocation: ISCO - 75%, - SREH- 25%

Cost Rent Allocation: ISCO - 75%, - SREH- 25%

ISCO pays its rent directly to Rehco Holdings.