State Street Bank and Trust Company                                 FORM OF
225 Franklin Street                                                 Exhibit g(4)
Boston, MA 02110

Ladies and Gentlemen:

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

          Pursuant to the Agreement, this letter is to provide notice of the
creation of two additional funds namely, the State Street Institutional Treasury
Fund and the State Street Institutional Treasury Plus Fund (the "New Funds").

          We request that you act as the New Funds' Custodian under the
respective Agreement. By your signature below, you agree that the existing
Exhibit C to the Agreements shall be deleted in its entirety and the attached
Exhibit C shall be substituted therefore.

          Please indicate your acceptance of the foregoing by executing two
copies of this letter, returning one to the Trust and retaining one copy for
your records.

                                        Very Truly Yours,


                                        State Street Institutional Investment
                                        Trust


                                        By:
                                            ------------------------------------


                                        State Street Bank and Trust Company


                                        By:
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Date: