EXHIBIT 15

                           STATE STREET CORPORATION

                Independent Accountant's Acknowledgment Letter

The Stockholders and Board of Directors
State Street Corporation

We are aware of the incorporation of reference in Registration Statements
(Form S-3 Nos: 333-16987, 333-34516, 333-34516-01, 333-34516-02, 333-34516-03,
333-2143, 33-49885, 333-49143, 333-49143-01, 333-49143-02 and 333-49143-03 and
Form S-8: Nos. 333-65281, 333-46678, 333-36409, 333-16979, 33-57359, 33-38672,
33-38671, 33-2882, 2-93157, 2-88641, 2-68696 and 2-68698), of our report dated
October 18, 2000 relating to the unaudited consolidated interim financial
statements of State Street Corporation which are included in its Form 10-Q for
the quarter ended September 30, 2000.

                                                              Ernst & Young LLP

Boston, Massachusetts
November 9, 2000