Exhibit 8.1

                            SULLIVAN & WORCESTER LLP
                             One Post Office Square
                           Boston, Massachusetts 02109


                                                 March 30, 1999





Hospitality Properties Trust
400 Centre Street
Newton, Massachusetts 02458

Ladies and Gentlemen:

         In  connection  with the  filing by  Hospitality  Properties  Trust,  a
Maryland real estate  investment trust (the "Company"),  of its Annual Report on
Form 10-K for the year ended  December  31,  1998 (the "Form  10-K"),  under the
Securities  Exchange Act of 1934, as amended (the "Exchange Act"), the following
opinion  is  furnished  to you to be filed  with  the  Securities  and  Exchange
Commission (the "SEC") as Exhibit 8.1 to the Form 10-K.

         We have  acted  as  counsel  for the  Company  in  connection  with the
preparation  of its  Form  10-K,  and we  have  examined  originals  or  copies,
certified or otherwise  identified to our  satisfaction,  of corporate  records,
certificates  and  statements of officers and  accountants of the Company and of
public  officials,  and such other documents as we have considered  relevant and
necessary in order to furnish the opinion  hereinafter set forth.  Specifically,
and without limiting the generality of the foregoing,  we have reviewed: (i) the
declaration of trust,  as amended and restated,  and the by-laws of the Company;
and (ii) the sections in the Company's Form 10-K captioned  "Federal  Income Tax
Considerations"  and  "ERISA  Plans,  Keogh  Plans  and  Individual   Retirement
Accounts."  With respect to all questions of fact on which our opinion is based,
we have  assumed  the  accuracy  and  completeness  of and  have  relied  on the
information set forth in the Form 10-K and in the documents incorporated therein
by reference,  and on representations made to us by the officers of the Company.
We have not independently verified such information.

         The opinion set forth below is based upon the Internal  Revenue Code of
1986,  as  amended,  the  Treasury  Regulations  issued  thereunder,   published
administrative  interpretations  thereof,  and judicial  decisions  with respect
thereto,  all as of the date hereof  (collectively the "Tax Laws"), and upon the
Employee  Retirement Income Security Act of 1974, as amended,  the Department of
Labor regulations issued thereunder, published administrative interpretations





Hospitality Properties Trust
March 30, 1999
Page 2

thereof,  and judicial decisions with respect thereto, all as of the date hereof
(collectively, the "ERISA Laws"). No assurance can be given that the Tax Laws or
the ERISA Laws will not change. In preparing the discussions with respect to the
matters  in  the  sections  of the  Form  10-K  captioned  "Federal  Income  Tax
Considerations"  and  "ERISA  Plans,  Keogh  Plans  and  Individual   Retirement
Accounts," we have made certain assumptions and expressed certain conditions and
qualifications therein, all of which assumptions,  conditions and qualifications
are incorporated herein by reference.

         Based upon and subject to the foregoing, we are of the opinion that the
discussions  in the  sections  of the Form 10-K  captioned  "Federal  Income Tax
Considerations"  and  "ERISA  Plans,  Keogh  Plans  and  Individual   Retirement
Accounts,"  in all material  respects are accurate and fairly  summarize the Tax
Laws issues and ERISA Laws issues addressed therein, and hereby confirm that the
opinions of counsel  referred to in said sections  represent our opinions on the
subject matter thereof.

         We hereby consent to the  incorporation of this opinion by reference as
an exhibit to the Form 10-K and to the reference to our firm therein.  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 Securities Act of 1933,
as  amended,  or  under  the  rules  and  regulations  of  the  SEC  promulgated
thereunder.

                                                Very truly yours,


                                                /s/ Sullivan & Worcester LLP

                                                SULLIVAN & WORCESTER LLP