[LETTERHEAD OF RICHARDS, LAYTON & FINGER]

                                  April 1, 1998

State Street Capital Trust III             State Street Corporation
c/o State Street Bank and Trust Company,   225 Franklin Street
N.A.                                       Boston, Massachusetts 02110
61 Broadway, 15th Floor
New York, New York 10006

            Re:   State Street Capital Trust III

Ladies and Gentlemen:

            We have acted as special Delaware counsel for State Street
Corporation, a Massachusetts corporation (the "Company"), and State Street
Capital Trust III, a Delaware business trust (the "Trust"), in connection with
the matters set forth herein. At your request, this opinion is being furnished
to you.

            For purposes of giving the opinions hereinafter set forth, our
examination of documents has been limited to the examination of originals or
copies of the following:

            (a) The Certificate of Trust of the Trust, dated as of March 25,
1998 (the "Certificate"), as filed in the office of the Secretary of State of
the State of Delaware (the "Secretary of State") on March 25, 1998;

            (b) The Declaration of Trust of the Trust, dated March 25, 1998,
among the Company, as depositor, and the trustees of the Trust named therein;

            (c) The Registration Statement (the "Registration Statement") on
Form S-3, including a preliminary prospectus (the "Prospectus"), relating to the
Capital Securities of the Trust representing preferred undivided beneficial
interests in the assets of the Trust (each, a "Capital Security" and
collectively, the "Capital Securities"), as proposed to be filed by the


State Street Capital Trust III
State Street Corporation
April 1, 1998
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Company, the Trust and the other registrants listed therein with the Securities
and Exchange Commission (the "SEC") on or about April 1, 1998;

            (d) A form of Amended and Restated Trust Agreement of the Trust, to
be entered into among the Company, as depositor, the trustees of the Trust named
therein, and the several holders, from time to time, of undivided beneficial
interests in the assets of the Trust (including Exhibits A, C and D thereto)
(the "Trust Agreement"), attached as an exhibit to the Registration Statement;
and

            (e) A Certificate of Good Standing for the Trust, dated April 1,
1998, obtained from the Secretary of State.

            Initially capitalized terms used herein and not otherwise defined
are used as defined in the Trust Agreement.

            For purposes of this opinion, we have not reviewed any documents
other than the documents listed above, and we have assumed that there exists no
provision in any document that we have not reviewed that bears upon or is
inconsistent with the opinions stated herein. We have conducted no independent
factual investigation of our own but rather have relied solely upon the
foregoing documents, the statements and information set forth therein and the
additional matters recited or assumed herein, all of which we have assumed to be
true, complete and accurate in all material respects.

            With respect to all documents examined by us, we have assumed (i)
the authenticity of all documents submitted to us as authentic originals, (ii)
the conformity with the originals of all documents submitted to us as copies or
forms, and (iii) the genuineness of all signatures.

            For purposes of this opinion, we have assumed (i) that the Trust
Agreement constitutes the entire agreement among the parties thereto with
respect to the subject matter thereof, including with respect to the creation,
operation and termination of the Trust, and that the Trust Agreement and the
Certificate are in full force and effect and have not been amended, (ii) except
to the extent provided in paragraph I below, the due creation or due
organization or due formation, as the case may be, and valid existence in good
standing of each party to the documents examined by us under the laws of the
jurisdiction governing its creation, organization or formation, (iii) the legal
capacity of natural persons who are parties to the documents examined by us,
(iv) that each of the parties to the documents examined by us has the power and
authority to execute and deliver, and to perform its obligations under, such
documents, (v) the due authorization, execution and delivery by all parties
thereto of all documents examined by us, (vi) the receipt by each Person to whom
a Capital Security is to be issued by the Trust


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State Street Corporation
April 1, 1998
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(collectively, the "Capital Security Holders") of a Capital Securities
Certificate for such Capital Security and the payment for the Capital Security
acquired by it, in accordance with the Trust Agreement and the Registration
Statement, (vii) that the Capital Securities are issued and sold to the Capital
Security Holders in accordance with the Trust Agreement and the Registration
Statement, and (viii) that the Delaware Trustee satisfies the requirements of
ss.3807 of the Delaware Business Trust Act, 12 Del. C. ss. 3801, et seq. (the
"Act"). We have not participated in the preparation of the Registration
Statement and assume no responsibility for its contents.

            This opinion is limited to the laws of the State of Delaware
(excluding the securities laws of the State of Delaware), and we have not
considered and express no opinion on the laws of any other jurisdiction,
including federal laws and rules and regulations relating thereto. Our opinions
are rendered only with respect to Delaware laws and rules, regulations and
orders thereunder which are currently in effect.

            Based upon the foregoing, and upon our examination of such questions
of law and statutes of the State of Delaware as we have considered necessary or
appropriate, and subject to the assumptions, qualifications, limitations and
exceptions set forth herein, we are of the opinion that:

            1. The Trust has been duly created and is validly existing in good
standing as a business trust under the Act.

            2. The Capital Securities will represent valid and, subject to the
qualifications set forth in paragraph 3 below, fully paid and nonassessable
undivided beneficial interests in the assets of the Trust.

            3. The Capital Security Holders, as beneficial owners of the Trust,
will be entitled to the same limitation of personal liability extended to
stockholders of private corporations for profit organized under the General
Corporation Law of the State of Delaware. We note that the Capital Security
Holders may be obligated to make payments as set forth in the Trust Agreement.

            We consent to the filing of this opinion with the SEC as an exhibit
to the Registration Statement. In addition, we hereby consent to the use of our
name under the heading "Validity of Securities" in the Prospectus. In giving the
foregoing consents, we do not thereby admit that we come within the category of
Persons whose consent is required under Section 7 of the Securities Act of 1933,
as amended, or the rules and regulations of the SEC thereunder.


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State Street Corporation
April 1, 1998
Page 4


Except as stated above, without our prior written consent, this opinion may not
be furnished or quoted to, or relied upon by, any other Person for any purpose.

                                          Very truly yours,

                                          /s/ Richards, Layton & Finger, P.A.

MIL/GWL/DJM/mag