EXHIBIT 5.1


                              SULLIVAN & WORCESTER LLP
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                                                              May 7, 2001


Senior Housing Properties Trust
400 Centre Street
Newton, Massachusetts 02458

       Re:  Senior Housing Properties Trust Registration Statement on Form S-3

Ladies and Gentlemen:

         In  connection  with the  registration  statement on Form S-3 under the
Securities  Act of 1933,  as amended (the  "Securities  Act") of Senior  Housing
Properties Trust, a Maryland real estate  investment trust (the "Company"),  and
the other  co-registrants  named  therein  (collectively  with the Company,  the
"Registrants"),   you  have   requested  our  opinions  set  forth  below.   The
co-registrants  are: (i) HRES1 Properties Trust, HRES2 Properties Trust,  SPTGEN
Properties  Trust,  SPTIHS Properties Trust,  SPTMISC  Properties Trust,  SPTMNR
Properties Trust, SPTMRT Properties Trust, SPTSUN Properties Trust and SPTSUN II
Properties  Trust,  each a Maryland real estate investment trust, and SHOPCO-AZ,
LLC,  SHOPCO-CA,  LLC,  SHOPCO-COLORADO,  LLC, SHOPCO-CT,  LLC, SHOPCO-GA,  LLC,
SHOPCO-IA,  LLC, SHOPCO-KS, LLC, SHOPCO-MI, LLC, SHOPCO-MO, LLC, SHOPCO-NC, LLC,
SHOPCO-NE,  LLC,  SHOPCO-SD,  LLC,  SHOPCO-WI,  LLC and  SHOPCO-WY,  LLC, each a
Delaware limited liability company,  and SNH-CALIFORNIA,  INC., SNH Holding Co.,
Inc., SNH-IOWA, INC., SNH-MICHIGAN, INC. and SNH-NEBRASKA, INC., each a Delaware
corporation,   and  SNH  Capital  Trust  Holdings,  a  Maryland  business  trust
(collectively,  the  "Subsidiaries"),  and (ii) SNH Capital Trust I, SNH Capital
Trust  II  and  SNH  Capital   Trust  III,  each  a  Maryland   business   trust
(collectively, the "Capital Trusts").

         You have provided us with a copy of such registration statement,  which
you  propose  to  file  with  the  Securities  and  Exchange   Commission   (the
"Commission") on or about the date hereof. Such registration  statement contains
a form of  preliminary  prospectus  with  respect to the offer and sale of up to
$500,000,000 in aggregate amount of one or more series of (i) debt securities of
the  Company  (the  "Debt  Securities"),  (ii)  preferred  shares of  beneficial
interest,  $.01 par value per share,  of the Company (the  "Preferred  Shares"),
(iii) depositary shares  representing  fractional  interests in Preferred Shares
("Depositary  Shares")  evidenced by depositary  receipts therefor  ("Depositary
Receipts"), (iv) common shares of beneficial interest, $.01 par value per share,
of the Company  (the  "Common  Shares"),  (v)  warrants to purchase  one or more
classes of securities  registered under the Registration  Statement,  (vi) trust
preferred securities of the Capital Trusts ("Trust Preferred Securities"), (vii)
guarantees  by the  Company  of  the  Trust  Preferred  Securities  (the  "Trust
Guarantees") and (viii) guarantees by one or more of the Subsidiaries of

Senior Housing Properties Trust
May 7, 2001
Page 2


Debt Securities or Trust  Guarantees of the Company or guarantees of one or more
co-registrants  (the  "Subsidiary   Guarantees"  and,  together  with  the  Debt
Securities,  Preferred Shares, Depositary Shares, Common Shares, Trust Preferred
Securities and Trust Guarantees, the "Registered Securities"),  in each case for
offering  from time to time, as set forth in the final  prospectus  that forms a
part of the Registration Statement, as defined below (the "Prospectus"),  and as
to be set forth in one or more final  supplements  to the  Prospectus  (each,  a
"Prospectus Supplement").

         As used in this  opinion,  the  term  "Registration  Statement"  means,
unless otherwise stated, such registration  statement,  as amended when declared
effective by the Commission (including any necessary  post-effective  amendments
thereto),  and the term  "Convertible  Registered  Securities"  means Registered
Securities which are convertible into, exchangeable for or exercisable for other
Registered Securities, and the term "Underlying Registered Securities" means any
Registered  Securities which are issuable upon conversion,  exchange or exercise
of Convertible Registered Securities.

         In  connection  with this  opinion,  we have examined and relied upon a
copy of the  Registration  Statement to be filed with the Commission on or about
the date hereof.  We have also  examined and relied upon  originals or copies of
such records,  agreements and  instruments of the  Registrants,  certificates of
public officials and of officers of the Registrants and such other documents and
records, and such matters of law, as we have deemed necessary as a basis for the
opinions hereinafter expressed. In making such examination,  we have assumed the
genuineness  of all  signatures,  the legal  capacity  of natural  persons,  the
authenticity of all documents submitted to us as originals and the conformity to
the  originals of all documents  submitted to us as copies,  which facts we have
not independently verified.

         We have necessarily  assumed in connection with the opinions  expressed
below that the terms and conditions of the Registered Securities and any related
indentures,  agreements and  instruments,  except to the extent described in the
Registration Statement and the form of preliminary prospectus contained therein,
as  originally  filed,  will  be,  and  that  any  related  proceedings  of  the
Registrants conducted after the date hereof will be conducted, (i) in accordance
with all applicable laws and each Registrants  charter and bylaws,  and (ii) not
in conflict with any contractual or other  restrictions which are binding on any
Registrant,  and that,  without  limiting the generality of the  foregoing,  any
agreements or instruments that are hereafter  required to be filed as an exhibit
to the Registration  Statement will be properly filed by an amendment thereto or
by the filing of a Form 8-K by the Company under the Securities  Exchange Act of
1934, as amended,  and properly  incorporated  by reference in the  Registration
Statement,  as permitted by the Securities Act and the rules and  regulations of
the Commission thereunder.

         To the  extent  that  the  obligations  of any  Registrant  under  each
Indenture, Warrant Agreement,  Depositary Agreement or Guarantee Agreement (each
as defined  below) may be  dependent  upon such  matters,  we have  assumed  for
purposes of this opinion that each Indenture Trustee,  Warrant Agent, Depositary
and  Guarantee  Trustee  (each as  defined  below) are duly  organized,  validly
existing and in good standing under the laws of their  respective  jurisdictions

Senior Housing Properties Trust
May 7, 2001
Page 3


of organization, and are duly qualified to engage in the activities contemplated
by, and have the  requisite  organizational  and legal  power and  authority  to
perform their respective  obligations under, each Indenture,  Warrant Agreement,
Depositary Agreement or Guarantee Agreement to which they are parties, that each
Indenture  Trustee,  Warrant Agent,  Depositary and Guarantee Trustee will be in
compliance,  generally  with  respect to acting as a trustee or agent under each
applicable  Indenture,  Warrant  Agreement,  Depositary  Agreement  or Guarantee
Agreement,  with all applicable laws and  regulations,  and that each Indenture,
Warrant  Agreement,  Depositary  Agreement and Guarantee  Agreement  will be the
valid and binding  agreements of each party thereto  (other than, in the case of
an indenture  in the form filed as Exhibit  4.1, 4.2 or 4.3 to the  Registration
Statement  or a  guarantee  agreement  in the form filed as Exhibit  4.19 to the
Registration Statement, when appropriately completed, the Company and each other
Registrant party thereto),  enforceable  against such parties in accordance with
their respective terms.

         We express no opinion herein as to the laws of any  jurisdiction  other
than the laws of The  Commonwealth of  Massachusetts  and the State of New York,
the General  Corporation Law and the Limited  Liability Company Act of the State
of Delaware and the federal laws of the United States of America, and we express
no  opinion as to state  securities  or blue sky laws.  Insofar as this  opinion
involves matters of Maryland law we have, with your permission, relied solely on
the opinion of Ballard Spahr Andrews & Ingersoll,  LLC dated May 7, 2001, a copy
of  which  we  understand  you  are  filing  herewith  as  Exhibit  5.2  to  the
Registration   Statement,   and  our  opinion  is  subject  to  the  exceptions,
qualifications and limitations therein expressed.

         Our  opinions  set forth below with  respect to the validity or binding
effect of any  security or  obligation  are subject to (i)  limitations  arising
under applicable bankruptcy,  insolvency,  reorganization,  fraudulent transfer,
moratorium or other  similar laws  affecting  the  enforcement  generally of the
rights and  remedies of  creditors  and secured  parties or the  obligations  of
debtors,  (ii) general principles of equity (regardless of whether considered in
a proceeding at law or in equity), including, without limitation, the discretion
of any court of  competent  jurisdiction  in granting  specific  performance  or
injunctive or other equitable  relief,  and (iii) an implied duty on the part of
the  party  seeking  to  enforce  rights or  remedies  to take  action  and make
determinations on a reasonable basis and in good faith to the extent required by
applicable law.

         Based on and subject to the  foregoing,  we are of the opinion that, as
of the date hereof:

                  1. Each series of Debt  Securities  will be validly issued and
         binding obligations of the Company when (i) the Registration  Statement
         shall have become effective under the Securities Act and the indentures
         filed  as  Exhibit  4.1,  4.2  and 4.3 to the  Registration  Statement,
         including any necessary supplemental indenture, or any other indenture,
         including any necessary  supplemental  indenture  thereto,  filed as an
         exhibit  to the  Registration  Statement,  as  the  case  may  be  (the
         applicable indenture,  as so filed and supplemented,  the "Indenture"),
         shall have been  qualified  under the Trust  Indenture  Act of 1939, as
         amended,  and the Indenture shall have been duly  authorized,  executed
         and  delivered  by the  Company  and a trustee  named  thereunder  (the
         "Indenture Trustee"), (ii) a Prospectus Supplement with respect to such
         series of Debt Securities and any related  Subsidiary  Guarantees shall
         have been filed with the Commission pursuant to Rule 424

Senior Housing Properties Trust
May 7, 2001
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         under the Securities  Act,  (iii) the Company's  Board of Trustees or a
         duly  authorized  committee  thereof  shall  have  duly  adopted  final
         resolutions (the "Final Debt Resolutions") authorizing the issuance and
         sale of such Debt Securities,  each as contemplated by the Registration
         Statement, the Prospectus, the applicable Prospectus Supplement and the
         Indenture,  and (iv) such series of Debt Securities shall have been (A)
         duly executed by the Company and authenticated by the Indenture Trustee
         as provided in the  Indenture  and the Final Debt  Resolutions  and (B)
         duly delivered to the purchasers  thereof against payment of the agreed
         consideration therefor, as provided in the Registration Statement,  the
         Prospectus, the applicable Prospectus Supplement, the Indenture and the
         Final  Debt  Resolutions.   If  such  Debt  Securities  are  Underlying
         Registered  Securities,  the  opinion  set forth in this  paragraph  is
         subject  to the  further  condition  that  the  Convertible  Registered
         Securities  relating  to  such  Debt  Securities,  at the  time  of the
         issuance thereof and of the conversion,  exchange or exercise  thereof,
         are validly issued, fully paid and non-assessable by the Company or are
         validly issued and binding obligations of the Company, as applicable.

                  2.  Each  Subsidiary  Guarantee  related  to a series  of Debt
         Securities  will be  validly  issued  and  binding  obligations  of the
         Subsidiaries  which  are  parties  thereto  when  (i) the  Registration
         Statement shall have become  effective under the Securities Act and the
         applicable   Indenture  shall  have  been  qualified  under  the  Trust
         Indenture Act of 1939, as amended,  and such Indenture  shall have been
         duly  authorized,  executed and  delivered  by the  Company,  each such
         Subsidiary and the Indenture Trustee, (ii) a Prospectus Supplement with
         respect to such series of Debt  Securities  and the related  Subsidiary
         Guarantees  shall have been filed with the Commission  pursuant to Rule
         424 under the  Securities  Act, (iii) the Board of Trustees or Board of
         Directors,  as the case may be, of each such Subsidiary shall have duly
         adopted  final   resolutions   (the  "Final   Guarantee   Resolutions")
         authorizing  such  Subsidiary  Guarantee,  each as  contemplated by the
         Registration  Statement,  the  Prospectus,  the  applicable  Prospectus
         Supplement and such  Indenture,  (iv) such  Subsidiary  Guarantee shall
         have been duly  executed  by each such  Subsidiary  as provided in such
         Indenture  and the  Final  Guarantee  Resolutions,  and (v)  such  Debt
         Securities  are the  validly  issued  and  binding  obligations  of the
         Company.

                  3. The Depositary  Shares will be validly  issued,  fully paid
         and  non-assessable by the Company and the Depositary  Receipts will be
         validly  issued  and will  entitle  the  holders  thereof to the rights
         specified therein and in the applicable Depositary Agreement,  when (i)
         the  related  Preferred  Shares have been duly  authorized  and validly
         issued,  fully paid and  non-assessable,  (ii) the  Company's  Board of
         Trustees or a duly authorized committee thereof shall have duly adopted
         resolutions (the "Final Depositary Shares  Resolutions")  approving one
         or more depositary  agreements,  including a form of Depositary Receipt
         set forth therein or related thereto (each, a "Depositary  Agreement"),
         relating to such Depositary Shares, between the Company and a financial
         institution  identified  therein as depositary  (each, a "Depositary"),
         (iii) the applicable Depositary Agreement shall have been duly executed
         and  delivered  by the  Company  and the  Depositary,  (iv) the related
         Preferred  Shares shall have been duly  deposited  with the  Depositary
         under  the  Depositary  Agreement,  and (v) the  applicable  Depositary
         Receipts

Senior Housing Properties Trust
May 7, 2001
Page 5


         shall have been duly  executed  by the  Depositary  as  provided in the
         applicable   Depositary  Agreement  and  the  Final  Depositary  Shares
         Resolutions  and  registered  and shall have been duly delivered to the
         purchasers   thereof  against  payment  of  the  agreed   consideration
         therefor,  as provided in the Registration  Statement,  the Prospectus,
         the  applicable  Prospectus   Supplement,   the  applicable  Depositary
         Agreement and the Final Depositary Shares Resolutions.

                  4. The Warrants will validly issued and binding obligations of
         the  Company  when (i) the  Registration  Statement  shall have  become
         effective under the Securities  Act, (ii) a Prospectus  Supplement with
         respect to such  Warrants  shall  have been  filed with the  Commission
         pursuant to Rule 424 under the Securities Act, (iii) the Warrants shall
         have been duly authorized by the Company, including by the due adoption
         by the  Company's  Board of  Trustees  or a duly  authorized  committee
         thereof  of  final   resolutions  (the  "Final  Warrant   Resolutions")
         authorizing  the issuance and sale of such Warrants as  contemplated by
         the   Registration   Statement,   the  Prospectus  and  the  applicable
         Prospectus  Supplement  and approving  one or more warrant  agreements,
         including a form of warrant set forth therein or related thereto (each,
         a "Warrant  Agreement"),  establishing the terms and conditions of such
         Warrants,  between the Company and a financial  institution  identified
         therein as warrant agent (each, a "Warrant Agent"), (iv) the applicable
         Warrant  Agreement  shall have been duly  executed and delivered by the
         Company and the Warrant  Agent,  and (v) such Warrants  shall have been
         duly executed by the Company and  authenticated by the Warrant Agent as
         provided in the  applicable  Warrant  Agreement  and the Final  Warrant
         Resolutions  and  registered  and shall have been duly delivered to the
         purchasers   thereof  against  payment  of  the  agreed   consideration
         therefor,  as provided in the Registration  Statement,  the Prospectus,
         the applicable Prospectus Supplement,  the applicable Warrant Agreement
         and the Final  Warrant  Resolutions.  If such  Warrants are  Underlying
         Registered  Securities,  the  opinion  set forth in this  paragraph  is
         subject  to the  further  condition  that  the  Convertible  Registered
         Securities  relating  to such  Warrants,  at the  time of the  issuance
         thereof  and of the  conversion,  exchange  or  exercise  thereof,  are
         validly  issued,  fully paid and  non-assessable  by the Company or are
         validly issued and binding obligations of the Company, as applicable.

                  5. Each Trust  Guarantee  will be a validly issued and binding
         obligation  of the Company when (i) the  Registration  Statement  shall
         have  become  effective  under  the  Securities  Act and the  guarantee
         agreement  filed as Exhibit 4.19 to the  Registration  Statement (as so
         filed, the "Guarantee Agreement"),  shall have been qualified under the
         Trust  Indenture Act of 1939, as amended,  and the Guarantee  Agreement
         shall have been duly authorized,  executed and delivered by the Company
         and a  trustee  named  thereunder  (the  "Guarantee  Trustee"),  (ii) a
         Prospectus  Supplement  with  respect  to the  related  series of Trust
         Preferred  Securities  and such Trust  Guarantee  shall have been filed
         with the  Commission  pursuant  to Rule 424 under the  Securities  Act,
         (iii) the Company's  Board of Trustees or a duly  authorized  committee
         thereof  shall have duly adopted  final  resolutions  authorizing  such
         Trust  Guarantee,  as contemplated by the Registration  Statement,  the
         Prospectus  and the  applicable  Prospectus  Supplement,  and (iv) such
         series of Trust

Senior Housing Properties Trust
May 7, 2001
Page 6


         Preferred  Securities  have been duly authorized and are validly issued
         by the applicable Capital Trust.

         All of the  opinions  set  forth  herein  are  rendered  as of the date
hereof, and we assume no obligation to update such opinions to reflect any facts
or circumstances which may hereafter come to our attention or any changes in the
law which may hereafter occur.

         We hereby  consent to the  filing of this  opinion as an exhibit to the
Registration  Statement  and to the  reference  to our  firm  in the  Prospectus
forming a part of the Registration  Statement. In giving such consent, we do not
thereby  admit that we come  within the  category  of persons  whose  consent is
required  under Section 7 of the Act or under the rules and  regulations  of the
Commission promulgated thereunder.

                                              Very truly yours,

                                              /s/ Sullivan & Worcester LLP

                                              SULLIVAN & WORCESTER LLP