LAW OFFICES
                         ROSENBERG & LIEBENTRITT, P.C.
                         _____________________________
                           TWO NORTH RIVERSIDE PLAZA
                                   Suite 1515
                            CHICAGO, ILLINOIS  60606
                             TELEPHONE 312.466.3456
WRITER'S DIRECT DIAL NUMBER    FAX 312.454-0335       WRITER'S DIRECT FAX NUMBER

       312.466.3612                                                 312.454-0335
                                                                             




                               December 23, 1997



Board of Trustees
Equity Residential Properties Trust
Two North Riverside Plaza
Suite 400
Chicago, Illinois  60606

Ladies and Gentlemen:


     We are acting as counsel to Equity Residential Properties Trust, a Maryland
real estate investment trust (the "Company"), in connection with its
registration statement on Form S-3 (SEC File No. 333-32183) (the "Registration
Statement") previously declared effective by the Securities and Exchange
Commission relating to (a) the proposed public offering of up to $750,000,000 in
aggregate amount of its common shares of beneficial interest, $.01 par value per
share ("Common Shares") and one or more series of its (i) preferred shares of
beneficial interest, $.01 par value per share (the "Preferred Shares") and (ii)
depositary shares representing fractional interests in Preferred Shares (the
"Depositary Shares" and, together with the Preferred Shares and Common Shares,
the "Securities"), all of which Securities may be offered and sold by the
Company from time to time as set forth in the prospectus which forms a part of
the Registration Statement (the "Prospectus"), and as to be set forth in one or
more supplements to the Prospectus (each, a "Prospectus Supplement").  This
opinion letter is rendered in connection with the proposed sale to Prudential
Securities Incorporated ("Prudential"), for deposit with the trustee of the
National Equity Trust Equity Portfolio Series 1, of an aggregate of 467,722
Common Shares (the "Shares") as described in a Prospectus Supplement dated
December 18, 1997.  This opinion letter is furnished to you at your request to
enable the Company to continue to fulfill the requirements of Item 601(b)(4) of
Regulation S-K, 17 C.F.R. (S)229.601(b)(5), in connection with the Registration
Statement.

     For purposes of this opinion letter, we have examined copies of the
following documents:

          1.   An executed copy of the Registration Statement.
 
          2.   The Second Amended and Restated Declaration of Trust, as amended,
               of the Company (the "Declaration of Trust"), as certified by the
               Maryland State Department of Assessments and Taxation on December
               17, 1997 and by the 

 
Board of Trustees
Equity Residential Properties Trust
December 23, 1997
Page 2


               Secretary of the Company on the date hereof as then being
               complete, accurate and in effect.
 
          3.   The Second Amended and Restated Bylaws of the Company, as 
               certified by the Secretary of the Company on the date hereof as
               then being complete, accurate and in effect.
 
          4.   Resolutions of the Board of Trustees of the Company adopted on 
               June 26, 1997 relating to the filing of the Registration
               Statement and related matters, and on November 11, 1997, and of
               the Pricing Committee of the Board of Trustees on December 18,
               1997, relating to the offering of the Shares, as certified by the
               Secretary of the Company on the date hereof as then being
               complete, accurate and in effect.
 
          5.   An executed copy of the Terms Agreement, dated December 18, 1997,
               among the Company, ERP Operating Limited Partnership and
               Prudential, which incorporates therein the terms and provisions
               of the Company's Standard Underwriting Provisions, dated May 16,
               1997 (collectively, the "Purchase Agreement").

     In our examination of the aforesaid documents, we have assumed the
genuineness of all signatures, the legal capacity of natural persons, the
accuracy and completeness of all documents submitted to us, the authenticity of
all original documents, and the conformity to authentic original documents of
all documents submitted to us as certified, telecopied, photostatic, or
reproduced copies.  This opinion letter is given, and all statements herein are
made, in the context of the foregoing.

     We call your attention to the fact that our firm only requires lawyers to
be qualified to practice law in the State of Illinois and, in rendering the
foregoing opinions, we express no opinion with respect to any laws relevant to
this opinion other than the laws and regulations identified herein.  With
respect to the opinions below that relate to the laws of the State of Maryland,
with your consent, we rely solely on the opinion of Hogan & Hartson L.L.P., a
copy of which is attached hereto as Exhibit A.

     Based upon, subject to and limited by the foregoing, we are of the opinion
that, as of the date hereof, following issuance of the Shares pursuant to the
terms of the Purchase Agreement and receipt by the Company of the consideration
for the Shares specified in the resolutions of the Board of Trustees and the
Pricing Committee thereof referred to above, the Shares will be 

 
Board of Trustees
Equity Residential Properties Trust
December 23, 1997
Page 3


validly issued, fully paid and nonassessable under Title 8 of the Corporations
and Associations Article of the Annotated Code of Maryland.

     We assume no obligation to advise you of any changes in the foregoing
subsequent to the delivery of this opinion letter.  This opinion letter has been
prepared solely for your use in connection with the filing by the Company of a
Current Report on Form 8-K on the date of this opinion letter, which Form 8-K
will be incorporated by reference into the Registration Statement.  This opinion
letter should not be quoted in whole or in part or otherwise be referred to, nor
filed with or furnished to any governmental agency or other person or entity,
without the prior written consent of this firm.

     We hereby consent (i) to be named in the Registration Statement, and in the
Prospectus, as attorneys who will pass upon the legality of the Securities to be
sold thereunder and (ii) to the filing of this opinion as an Exhibit to the
Registration Statement.  In giving this consent, we do not thereby admit that we
are an "expert" within the meaning of the Securities Act of 1933, as amended.

                                         Very truly yours,

                                         ROSENBERG & LIEBENTRITT, P.C.



                                         By:   /s/ Ruth Pinkham Haring
                                               ----------------------------
                                               Vice President


                                                                       Exhibit A

                           [Hogan & Hartson L.L.P.]
 
                               December 23, 1997



Rosenberg & Liebentritt, P.C.
Two North Riverside Plaza
Suite 1515
Chicago, Illinois 60606


Ladies and Gentlemen:

          We are acting as special Maryland counsel to Equity Residential
Properties Trust, a Maryland real estate investment trust (the "Company"), in
connection with its registration statement on Form S-3 (No. 333-32183) (the
"Registration Statement") previously declared effective by the Securities and
Exchange Commission relating to the proposed public offering of securities of
the Company that may be offered and sold by the Company from time to time as set
forth in the prospectus which forms a part of the Registration Statement (the
"Prospectus"), and as to be set forth in one or more supplements to the
Prospectus (each, a "Prospectus Supplement").  This opinion letter is rendered
in connection with the proposed public offering of 467,722 common shares of
beneficial interest, $.01 par value (the "Common Shares"), as described in a
Prospectus Supplement dated December 18, 1997.  This opinion letter is
furnished to you at your request to enable the Company to continue to fulfill
the requirements of Item 601(b)(5) of Regulation S-K, 17 C.F.R. (S)
229.601(b)(5), in connection with the Registration Statement.

          For purposes of this opinion letter, we have examined copies of the
following documents:

          1.  An executed copy of the Registration Statement.

          2.   The Second Amended and Restated Declaration of Trust, as amended,
               of the Company (the "Declaration of Trust"), as certified by the
               Maryland State Department of Assessments and Taxation on December
               17, 1997 and the Secretary of the

 
Rosenberg & Liebentritt, P.C.
December 23, 1997
Page 2


               Company on the date hereof as then being complete, accurate and
               in effect.

          3.   The Second Amended and Restated Bylaws of the Company, as
               certified by the Secretary of the Company on the date hereof as
               then being complete, accurate and in effect.

          4.   Resolutions of the Board of Trustees of the Company adopted on
               June 26, 1997, relating to the filing of the Registration
               Statement and related matters, and on November 14, 1997, and of
               the Pricing Committee of the Board of Trustees on December 18,
               1997, relating to the offering of the Common Shares, as certified
               by the Secretary of the Company on the date hereof as then being
               complete, accurate and in effect.

          5.   An executed copy of the Terms Agreement (which incorporates by
               reference the Company's Standard Underwriting Provisions dated
               May 16, 1997) dated December 18, 1997, between the Company, ERP
               Operating Limited Partnership, a Delaware limited partnership,
               and Prudential Securities Incorporated (the "Terms Agreement").

          In our examination of the aforesaid documents, we have assumed the
genuineness of all signatures, the legal capacity of natural persons, the
accuracy and completeness of all documents submitted to us, the authenticity of
all original documents and the conformity to authentic original documents of all
documents submitted to us as copies (including telecopies).  This opinion letter
is given, and all statements herein are made, in the context of the foregoing.

          This opinion letter is based as to matters of law solely on Title 8 of
the Corporations and Associations Article of the Annotated Code of Maryland (the
"Maryland REIT Statute").  We express no opinion herein as to any other laws,
statutes, regulations, or ordinances.

          Based upon, subject to and limited by the foregoing, we are of the
opinion that following issuance of the Common Shares pursuant to the terms of
the Terms Agreement and receipt by the Company of the consideration for the
Common Shares specified in the resolutions of the Board of Trustees and the
Pricing Committee referred to above, the Common Shares will be validly issued,
fully paid and nonassessable under the Maryland REIT Statute.

 
Rosenberg & Liebentritt, P.C.
December 23, 1997
Page 3


          We assume no obligation to advise you of any changes in the foregoing
subsequent to the delivery of this opinion letter.  This opinion letter has been
prepared solely for your use in connection with the filing by the Company of a
Current Report on Form 8-K on the date of this opinion letter, which Form 8-K
will be incorporated by reference into the Registration Statement.  This opinion
letter should not be quoted in whole or in part or otherwise be referred to, nor
filed with or furnished to any governmental agency or other person or entity,
without the prior written consent of this firm.

          We hereby consent to the reference to this firm under the caption
"Legal Matters" in the prospectus constituting a part of the Registration
Statement.  In giving this consent, we do not thereby admit that we are an
"expert" within the meaning of the Securities Act of 1933, as amended.


                                    Very truly yours,



                                    HOGAN & HARTSON L.L.P.