State Street Institutional Investment Trust

One Iron Street

Boston, MA 02210

State Street Bank and Trust Company

One Congress Street

Boston, Massachusetts 02114

Ladies and Gentlemen:

Reference is made to the Amended and Restated Custodian Agreement between us dated February 14, 2001 (the “Agreement”).

Pursuant to the Agreement, this letter is to provide notice of the creation of the following additional series of the State Street Institutional Investment Trust (the “Trust”) as presented in the following chart (the “New Fund”):

We request that you act as the New Fund’s Custodian under the Agreement. As compensation for such services, you shall be entitled to receive from the New Fund the annual fee reflected on the fee schedule to the Agreement.

Please acknowledge receipt of this letter and your agreement below.