May 27, 1998




Alexander's, Inc.
Park 80 West, Plaza II
Saddle Brook, New Jersey 07663

Ladies and Gentlemen:

                  We have acted as counsel for Alexander's, Inc., a Delaware
corporation (the "Company"), in connection with the Registration Statement on
Form S-8 (the "Registration Statement") of the Company filed with the Securities
and Exchange Commission under the Securities Act of 1933, as amended (the
"Securities Act"), with respect to 700,000 shares (the "Shares") of common
stock, par value $1.00 per share, of the Company (the "Common Stock"), to be
issued from time to time pursuant to the Alexander's, Inc. Omnibus Stock Plan
(the "Plan").

                  In so acting, we have examined the Registration Statement and
we have also examined and relied as to factual matters upon the representations
and warranties contained in originals, or copies certified or otherwise
identified to our satisfaction, of such documents, records, certificates and
other instruments as in our judgment are necessary or appropriate to enable us
to render the opinion expressed below. In such examination, we have assumed the
genuineness of all signatures, the authenticity of all documents, certificates
and instruments submitted to us as originals and the conformity with originals
of all documents submitted to us as copies.

                  The opinion expressed below is limited to the law of the State
of New York, the General Corporation Law of Delaware and the federal law of the
United States, and we do not express any opinion herein concerning any other
law.

                  Based upon the foregoing and having regard for such legal
considerations as we have deemed relevant, we are of the opinion that the Shares
have been duly authorized by the Company and, when (a) issued and delivered by
the Company in accordance with the terms of the Plan and (b) paid for in full in
accordance with the terms of the Plan, the Shares will be validly issued, fully
paid and non-assessable.




Alexander's, Inc.                        2                     May 27, 1998




                  We hereby consent to the filing of this opinion as an exhibit
to the Registration Statement.

                                                  Very truly yours,

                                                  /s/ Shearman & Sterling