KIRKPATRICK & LOCKHART LLP
                            1800 Massachusetts Avenue
                                  Second Floor
                             Washington, D.C. 20036



                                 October 3, 1997




Federal Realty Investment Trust
1626 East Jefferson Street
Rockville, Maryland  20852

Ladies and Gentlemen:

         You have requested our opinion as counsel to Federal Realty  Investment
Trust,  a business  trust  organized  under the laws of the District of Columbia
with its headquarters  located in Rockville,  Maryland ("Trust"),  in connection
with a Prospectus  Supplement,  dated October 1, 1997 to the Trust's Prospectus,
dated  November 7, 1995  (registration  statement No.  33-63687)  ("Registration
Statement")  relating to the Trust's  offering and sale of  4,000,000  shares of
7.95% Series A Cumulative  Redeemable Preferred Shares, no par value ("Shares"),
pursuant  to an  underwriting  agreement  and a pricing  agreement,  each  dated
October 1, 1997 (together,  the "Underwriting  Agreement") between the Trust and
Goldman, Sachs & Co., Prudential Securities Incorporated and Smith Barney Inc.

         We have participated in the preparation of the Registration  Statement,
and in  connection  therewith,  have  examined and relied upon the  originals or
copies of such records, agreements,  documents and other instruments,  including
the Third Amended and Restated  Declaration of Trust of the Trust  ("Declaration
of Trust"), the Bylaws of the Trust, the minutes of the meetings of the Trustees
to date relating to the  authorization  and issuance of the Shares and have made
such inquiries of such officers and  representatives  as we have deemed relevant
and  necessary  as the basis for the  opinion  hereinafter  set  forth.  In such
examination, we have assumed, without independent verification,  the genuineness
of all  signatures  (whether  original or  photostatic),  the legal  capacity of
natural persons, the authenticity of all documents submitted to us as originals,
and the conformity to authentic original documents of all documents submitted to
us as certified or  photostatic  copies.  We have assumed,  without  independent
verification, the accuracy of the relevant facts stated therein.

         As to any other facts  material to the  opinion  expressed  herein that



Federal Realty Investment Trust
October 3, 1997
Page 2


were not independently  established or verified,  we have relied upon statements
and representations of officers and employees of the Trust.

         Based upon the  foregoing and subject to the  qualifications  set forth
below, we are of the opinion that:

         The Shares have been duly  authorized  by the Trust and when  delivered
against  payment  therefor as contemplated in the  Underwriting  Agreement,  the
Shares  will be  legally  issued,  fully  paid  and  non-assessable,  except  as
described in the Prospectus that forms a part of the Registration Statement.

         We hereby  consent to the  filing of this  opinion as an exhibit to the
Trust's  Current  Report  on Form 8-K filed  with the  Securities  and  Exchange
Commission on October 3, 1997.

                                         Very truly yours,

                                         KIRKPATRICK & LOCKHART LLP


                                         By: /s/ Thomas F. Cooney
                                             --------------------------
                                             Thomas F. Cooney