EXHIBIT 10.33

                                 EXECUTION COPY


                                U.S. $450,000,000



                               FOURTH AMENDMENT TO
               THIRD AMENDED AND RESTATED REVOLVING LOAN AGREEMENT


                                      among


                     HEALTH AND RETIREMENT PROPERTIES TRUST,
                                  as Borrower,


                            THE LENDERS NAMED HEREIN,


                  DRESDNER KLEINWORT BENSON NORTH AMERICA LLC,
                                    as Agent,


                              FLEET NATIONAL BANK,
                             as Administrative Agent





                          Dated as of November 14, 1997






                     HEALTH AND RETIREMENT PROPERTIES TRUST

                               FOURTH AMENDMENT TO
               THIRD AMENDED AND RESTATED REVOLVING LOAN AGREEMENT

                          DATED AS OF NOVEMBER 14, 1997


         This FOURTH  AMENDMENT  (this  "Amendment") is dated as of November 14,
1997 among HEALTH AND  RETIREMENT  PROPERTIES  TRUST,  a real estate  investment
trust formed under the laws of the State of Maryland  ("Borrower"),  the several
lenders listed on the signature pages hereof (the "Lenders"), DRESDNER KLEINWORT
BENSON NORTH AMERICA LLC (as successor to Kleinwort Benson  Limited),  a limited
liability company organized under the laws of Delaware,  as agent for itself and
the  other  Lenders  (in such  capacity,  together  with any  successor  in such
capacity in accordance with the terms of the Loan  Agreement,  as defined below,
"Agent"),  and FLEET NATIONAL BANK (as successor to Fleet Bank of Massachusetts)
a  bank  organized  under  the  laws  of  the  United  States  of  America,   as
administrative  agent (in such  capacity,  together  with any  successor in such
capacity in  accordance  with the terms of the Loan  Agreement,  "Administrative
Agent"),  and is made with reference to the Third Amended and Restated Revolving
Loan Agreement dated as of March 15, 1996, as amended by a First Amendment dated
as of December  15, 1996,  a Second  Amendment  and Waiver dated as of March 19,
1997 and a Third  Amendment  dated as of July 30,  1997 (as  amended to date and
from time to time hereafter,  the "Loan Agreement") among Borrower, the Lenders,
Agent, Administrative Agent and Co-Agents referred to therein and, in connection
with Section 9 of the Loan  Agreement and the guaranties  given therein,  HEALTH
AND RETIREMENT  PROPERTIES  INTERNATIONAL,  INC., a Delaware  corporation  and a
direct wholly-owned Subsidiary of Borrower ("Retirement  Properties"),  CAUSEWAY
HOLDINGS INC., a Massachusetts  corporation and a direct wholly-owned Subsidiary
of Borrower  ("Causeway"),  SJO CORPORATION,  a Massachusetts  corporation and a
direct  wholly-owned  Subsidiary of Borrower ("SJO"),  HUB PROPERTIES TRUST, HUB
ACQUISITION  TRUST,  and HUB LA  PROPERTIES  TRUST,  each a Maryland real estate
investment  trust and each a direct  wholly-owned  Subsidiary  of Borrower  (the
"Trust  Subsidiaries"),  HUB REALTY  FUNDING,  INC., HUB  MANAGEMENT,  INC., HUB
REALTY  COLLEGE  PARK,  INC.,  HUB REALTY I, INC.,  HUB REALTY IV., INC. and HUB
REALTY GOLDEN, INC., each a Delaware  corporation and a wholly-owned  Subsidiary
of Borrower (the "Delaware Subsidiaries"), and HUB REALTY COLLEGE PARK I, LLC, a
Maryland  limited  liability  company and a wholly-owned  Subsidiary of Borrower
(the "LLC").  Capitalized  terms used herein without  definition  shall have the
same meanings herein as set forth in the Loan Agreement.


                                        1



         WHEREAS,  Borrower has advised  Lenders that it wishes to amend certain
terms of the Loan Agreement;

         WHEREAS,  subject to the terms set forth herein, Lenders have agreed to
amend the Loan Agreement.

         NOW,  THEREFORE,  in  consideration of the premises and the agreements,
provisions and covenants herein contained, the parties hereto agree
as follows:

         1. Amendments to Loan Agreement.

         (a)  Section  1.1  of the  Loan  Agreement  is  hereby  amended  by the
amendment and restatement of the definition of "Facility" as follows:-

                  ""Facility" means each (i) operating  facility offering health
                  care or  related  services  or  rehabilitation  or  retirement
                  services or other health care related  income  producing  real
                  property  interest  (including,  without  limitation,  the Fee
                  Interests and/or Leasehold Interests and/or Mortgage Interests
                  associated with such facility) in which Borrower or any of its
                  Subsidiaries  has  acquired  or will  acquire an  interest  as
                  owner,  lessee  or  mortgagee,  and (ii)  facility  comprising
                  office  or  similar   administrative  type  space  (including,
                  without   limitation,   the  Fee  Interest  and/or   Leasehold
                  Interests  associated with such facility) in which Borrower or
                  any of its  Subsidiaries  has acquired an interest as owner or
                  lessee and which  facility is leased or  subleased by Borrower
                  or any of its  Subsidiaries to a Government  Agency or, in the
                  case of a Medical  Office  Asset,  for  medical  research  and
                  development  or,  in the  case of a Fee or  Mortgage  Interest
                  described  in  Section  6.7(vi),  for  any  business  purpose,
                  including,  without  limitation,  in the  case of both (i) and
                  (ii), each Property and Mortgaged Property.

         (b) Section 6.7 of the Loan Agreement is hereby amended by deleting the
word "and"  immediately  before (v) in the text thereof and  replacing it with a
comma,  deleting the period at the end thereof and adding the following  proviso
at the end thereof:-

                  ", and (vi)  notwithstanding the preceding  provisions of this
                  Section  6.7,  Borrower  shall  not be deemed to have made any
                  material  change in the nature of its  business  as  presently
                  conducted  to  the  extent  that  the  Borrower  directly,  or
                  indirectly  through a  Subsidiary,  acquires or  operates,  or
                  acquires or funds a Mortgage  Interest  in,  income  producing
                  real  property   interests  and   facilities   not  heretofore
                  described in this Section 6.7 if such real property  interests
                  or Mortgage Interests (i) valued at cost as of


                                        2


                  the  date  of  their  respective  acquisitions,  do not in the
                  aggregate  exceed 10% of the  aggregate  Allowed  Value of the
                  Properties  and  Mortgage  Interests  of the  Borrower and its
                  Subsidiaries  on a  consolidated  basis  determined (x) at the
                  time of such  acquisition  or (y) if a facility is at the time
                  of its  acquisition  of a type  heretofore  described  in this
                  Section  6.7  but  is  thereafter  converted  to  a  type  not
                  heretofore so described,  on the date of such conversion,  and
                  (ii) are not treated by the Borrower as Eligible Properties or
                  Eligible  Mortgages,  as the case may be,  for any  purpose of
                  this Agreement."

         (c) Sections 7.1 (r) and (s) of the Loan  Agreement are hereby  amended
and restated as follows:

                  "(r) Medical  Office Assets and Clinics.  More than 55% of the
                  aggregate   Allowed  Value  of  the  Properties  and  Mortgage
                  Interests  shall be  attributable  to  Medical  Office  Assets
                  and/or Clinics; or"

         (d) Sections 7.1 (t), (u) and (v) are hereby renumbered as Sections 7.1
  (s), (t) and (u), respectively.

         2. Conditions to Effectiveness.

         Section 1 of this Amendment shall become effective immediately upon the
prior or concurrent  satisfaction  of the conditions that Borrower shall deliver
to Agent for  Lenders  (with  sufficient  originally  executed  copies  for each
Lender)  executed  copies of this  Amendment,  executed by Borrower,  Retirement
Properties, Causeway, SJO, the Trust Subsidiaries, the Delaware Subsidiaries and
the LLC, Agent, Co-Agent(s) and the Majority Lenders.

         3. Representations and Warranties.

         In order to induce  Lenders and Agent to enter into this  Amendment and
to amend the Loan Agreement in the manner provided herein,  Borrower  represents
and warrants to each Lender and Agent that the  following  statements  are true,
correct and complete:

         (a) Borrower has the power and  authority to enter into this  Amendment
and to carry out the  transactions  contemplated by, and perform its obligations
under,  the  Loan  Agreement  (as  amended  by  this  Amendment,   the  "Amended
Agreement").

         (b) The execution and delivery of this Amendment and the performance of
the Amended  Agreement have been authorized by all necessary  action on the part
of Borrower.

                                        3



         (c) The  execution  and delivery by Borrower of this  Amendment and the
performance  by  Borrower  of the  Amended  Agreement  and the  use of  proceeds
thereunder (i) do not violate any  Requirement of Law or Contractual  Obligation
of Borrower,  (ii) will not result in, or require, the creation or imposition of
any Lien on any of its properties or revenues pursuant to any Requirement of Law
or  Contractual  Obligation  of Borrower and (iii) do not require the consent of
any third party.

         (d) This  Amendment and the Amended  Agreement  have been duly executed
and delivered by Borrower and are the legally valid and binding  obligations  of
Borrower,  enforceable  against  Borrower in  accordance  with their  respective
terms,  except  as  enforceability  may be  limited  by  applicable  bankruptcy,
insolvency, reorganization, moratorium or similar laws affecting the enforcement
of creditors' rights generally.

         (e) The  representations  and warranties  contained in Section 3 of the
Loan  Agreement  are and will be true,  correct  and  complete  in all  material
respects  on and as of the  effective  date  described  in Section 2 to the same
extent  as  though  made on and as of  that  date,  except  to the  extent  such
representations and warranties  specifically relate to an earlier date, in which
case they were true,  correct and complete in all material respects on and as of
such earlier date.

         (f) After giving effect to this Amendment, no event has occurred and is
continuing or will result from the consummation of the transactions described in
or otherwise  contemplated by this Amendment that would  constitute a Default or
an Event of Default.

         (g)  The  Declaration  of  Trust,   By-Laws  and  other  organizational
documents of Borrower have not been amended  since May 14, 1997,  and the copies
thereof  delivered to Lenders  under the Loan  Agreement  are true,  correct and
complete  copies thereof as in effect on the effective date described in Section
2.

         4. Guarantors' Acknowledgement and Consent.

         Each of Retirement Properties,  Causeway,  SJO, the Trust Subsidiaries,
the  Delaware  Subsidiaries  and the LLC  (each a  "Subsidiary  Guarantor")  has
guarantied the obligations of Borrower under Section 9 of the Loan Agreement.

         Each Subsidiary  Guarantor hereby acknowledges that it has reviewed the
terms and  provisions of the Loan  Agreement and this  Amendment and consents to
the  amendment of the  provisions  of the  Agreement  effected  pursuant to this
Amendment. Each Subsidiary Guarantor hereby confirms that its guaranty under the
Loan  Agreement  will  continue to guaranty to the fullest  extent  possible the
payment and performance of all obligations of Borrower now or hereafter existing
under or in respect of the Amended Agreement and the Notes defined therein. Each
Subsidiary Guarantor acknowledges and agrees that Section 9 of

                                        4


the Loan  Agreement  shall continue in full force and effect and that all of its
obligations  thereunder shall be valid and enforceable and shall not be impaired
or limited by the execution or effectiveness of this Amendment.

         Each   Subsidiary   Guarantor   acknowledges   and   agrees   that  (a)
notwithstanding  the conditions to  effectiveness  set forth in this  Amendment,
such Subsidiary  Guarantor is not required by the terms of the Loan Agreement to
consent  to the  amendments  to the Loan  Agreement  effected  pursuant  to this
Amendment  and (b)  nothing in the Loan  Agreement  or this  Amendment  shall be
deemed to  require  the  consent  of such  Subsidiary  Guarantor  to any  future
amendments or waivers to the Loan Agreement.

         5.  Reference  to and  Effect  on the Loan  Agreement  and  Other  Loan
Documents.  Except as specifically  amended  hereby,  the Loan Agreement and the
other  Loan  Documents  shall  remain in full  force and  effect  and are hereby
ratified and confirmed.

         6. Fees and  Expenses.  Borrower  agrees to pay to Agent on demand  all
reasonable  costs,  fees and  expenses  incurred  by Agent  (including,  without
limitation,  legal fees and  expenses)  with respect to this  Amendment  and the
documents and transactions contemplated hereby.

         7.  Execution in  Counterparts.  This  Amendment may be executed in any
number  of   counterparts,   and  by  different   parties   hereto  in  separate
counterparts,  each of which when so executed and  delivered  shall be deemed an
original,  but all such counterparts taken together shall constitute but one and
the same instrument.

         8. Headings. Section headings in this Amendment are included herein for
convenience  of reference only and shall not constitute a part of this Amendment
for any other purpose or be given any substantive effect.

         9.  APPLICABLE LAW. THIS AMENDMENT SHALL BE GOVERNED BY AND INTERPRETED
IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

         10.  Limitation of Amendment.  Without  limiting the  generality of the
provisions of Section 10.4 of the Loan Agreement, the amendments set forth above
shall be limited  precisely as written,  and nothing in this Amendment  shall be
deemed to prejudice  any right or remedy that any Lender may now have (except to
the extent such right or remedy was based upon  existing  defaults that will not
exist after giving effect to this  Amendment) or may have in the future under or
in  connection  with the Loan  Agreement  or any other  instrument  or agreement
referred to therein.

                                        5



         11.  Acknowledgment.  Borrower  acknowledges that there are no existing
claims,  defenses,  personal or otherwise,  or rights of set off whatsoever with
respect to the Amended Agreement or any of the other Loan Documents.

         12. NONLIABILITY OF TRUSTEES.

         (a) THE DECLARATION OF TRUST  ESTABLISHING  BORROWER,  DATED OCTOBER 9,
1986, A COPY OF WHICH, TOGETHER WITH ALL AMENDMENTS THERETO (THE "DECLARATION"),
IS DULY FILED WITH THE  DEPARTMENT OF  ASSESSMENTS  AND TAXATION OF THE STATE OF
MARYLAND, PROVIDES THAT THE NAME "HEALTH AND RETIREMENT PROPERTIES TRUST" REFERS
TO THE  TRUSTEES  UNDER  THE  DECLARATION  COLLECTIVELY  AS  TRUSTEES,  BUT  NOT
INDIVIDUALLY OR PERSONALLY, AND THAT NO TRUSTEE, OFFICER, SHAREHOLDER,  EMPLOYEE
OR AGENT  OF  BORROWER  SHALL  BE HELD TO ANY  PERSONAL  LIABILITY,  JOINTLY  OR
SEVERALLY,  FOR ANY  OBLIGATION  OF, OR CLAIM  AGAINST,  BORROWER.  ALL  PERSONS
DEALING WITH BORROWER, IN ANY WAY, SHALL LOOK ONLY TO THE ASSETS OF BORROWER FOR
THE PAYMENT OF ANY SUM OR THE PERFORMANCE OF ANY OBLIGATION.

         (b) THE  DECLARATIONS OF TRUST  ESTABLISHING HUB PROPERTIES TRUST DATED
SEPTEMBER  12,  1996,  HUB  ACQUISITION  TRUST  DATED  MARCH 14, 1997 AND HUB LA
PROPERTIES TRUST DATED MAY 12, 1997, A COPY OF EACH OF WHICH,  TOGETHER WITH ALL
AMENDMENTS THERETO (THE "TRUST SUBSIDIARIES  DECLARATIONS"),  IS DULY FILED WITH
THE  DEPARTMENT OF ASSESSMENTS  AND TAXATION OF THE STATE OF MARYLAND,  PROVIDES
THAT THE NAMES  "HUB  PROPERTIES  TRUST",  "HUB  ACQUISITION  TRUST" AND "HUB LA
PROPERTIES  TRUST" REFER TO THE RESPECTIVE  TRUSTEES UNDER THE RESPECTIVE  TRUST
SUBSIDIARIES  DECLARATIONS  COLLECTIVELY  AS TRUSTEES,  BUT NOT  INDIVIDUALLY OR
PERSONALLY, AND THAT NO TRUSTEE, OFFICER, SHAREHOLDER,  EMPLOYEE OR AGENT OF ANY
OF THE TRUST  SUBSIDIARIES SHALL BE HELD TO ANY PERSONAL  LIABILITY,  JOINTLY OR
SEVERALLY,  FOR ANY OBLIGATION OF, OR CLAIM AGAINST, SUCH TRUST SUBSIDIARY.  ALL
PERSONS DEALING WITH EACH TRUST  SUBSIDIARY,  IN ANY WAY, SHALL LOOK ONLY TO THE
ASSETS OF SUCH TRUST SUBSIDIARY FOR THE PAYMENT OF ANY SUM OR THE PERFORMANCE OF
ANY OBLIGATION.

                  [Remainder of page intentionally left blank]


                                        6


         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly  executed  and  delivered  by  their  respective  officers  thereunto  duly
authorized as of the date first written above.

                                      HEALTH AND RETIREMENT
                                      PROPERTIES TRUST

                                      By:    /s/ Ajay Saini
                                      Name:  Ajay Saini
                                      Title  Treasurer

                                      DRESDNER KLEINWORT BENSON
                                      NORTH AMERICA LLC, as Agent

                                      By: /s/
                                      Name:  
                                      Title  Executive Vice President

                                      By: /s/
                                      Name:
                                      Title

                                      DRESDNER BANK AG, New York Branch,
                                      as a Lender

                                      By:    /s/ Felix K. Camacho
                                      Name:  Felix K. Camacho
                                      Title  Assistant Treasurer

                                      By:    /s/ Robert Grella
                                      Name:  Robert Grella
                                      Title  Vice President



                                      S - 1



                                      FLEET NATIONAL BANK, as
                                      Administrative Agent and as a Lender

                                      By:    /s/ Ginger Stolzenthaler
                                      Name:  G. Stolzenthaler
                                      Title  Senior Vice President

                                      BANK OF MONTREAL, as a Co-Agent and
                                      as a Lender

                                      By:    /s/ Jeff Forsythe
                                      Name:  Jeff Forsythe
                                      Title  Director

                                      CIBC INC., as a Co-Agent and as a Lender

                                      By:    /s/ Timothy E. Doyle
                                      Name:  Timothy E. Doyle
                                      Title  Managing Director CIBC Oppenheimer
                                             Corp as Agent

                                      CITICORP REAL ESTATE, INC., as a Co-
                                      Agent and as a Lender

                                      By:    /s/ Susan McManigal
                                      Name:  Susan McManigal
                                      Title  Attorney-In-Fact

                                      CREDIT LYONNAIS, Cayman Island
                                      Branch, as a Co-Agent and as a Lender

                                      By:    /s/ Farboud Tavangar
                                      Name:  Farboud Tavangar
                                      Title  First Vice President


                                      S - 2




                                      FIRST UNION NATIONAL BANK, as a
                                      Co-Agent and as a Lender

                                      By:    /s/ Joseph H. Towell
                                      Name:  Joseph H. Towell
                                      Title  Senior Vice President

                                      KEY CORPORATE CAPITAL INC., as a
                                      Co-Agent and as a Lender

                                      By:    /s/ Angela G. Mago
                                      Name:  Angela G. Mago
                                      Title  Vice President

                                      SOCIETE GENERALE, as a Co-Agent and
                                      as a Lender

                                      By:    /s/ Sedare Coradin
                                      Name:  Sedare Coradin
                                      Title  Vice President

                                      THE SUMITOMO BANK, LIMITED, as a
                                      Lender

                                      By:    /s/D.G. Eastman
                                      Name:  D.G. Eastman
                                      Title  Vice President and manager

                                      By:    /s/ Alfred DoGermanis
                                      Name:  Alfred DoGermanis
                                      Title  Vice President


                                      S - 3



                                       ABBEY NATIONAL TREASURY
                                       SERVICES PLC, as a Lender

                                       By:    /s/ R. Gambel
                                       Name:  R. Gambel
                                       Title  Asset Backed Securities

                                       VIA BANQUE, as a Lender

                                       By:    /s/ C. Prot
                                       Name:  C. Prot
                                       Title  Senior Directory

                                       By:    /s/ P. Arnout
                                       Name:  P. Arnout
                                       Title  Director

                                       RIGGS BANK N.A., as a Lender

                                       By: /s/
                                       Name:
                                       Title

                                       THE BANK OF NEW YORK, as a Lender

                                       By:    /s/ David C. Judge
                                       Name:  David C. Judge
                                       Title  Vice President




                                      S - 4



                                       THE LONG-TERM CREDIT BANK OF
                                       JAPAN, LTD., New York Branch, as a
                                       Lender

                                       By:    /s/ Hiroshi Kitada
                                       Name:  Hiroshi Kitada
                                       Title  Deputy General Manager

                                       THE BANK OF NOVA SCOTIA, New York
                                       Agency, as a Lender

                                       By:    /s/ Chistopher I. Grant
                                       Name:  Chistopher I. Grant
                                       Title  Senior Relationship Manager

                                       BANQUE NATIONAL DE PARIS, as a
                                       Lender

                                       By:     /s/ Katherine Wolfe
                                       Name:   Katherine Wolfe
                                       Title   Vice President

                                       By:    /s/ Charles H. Day
                                       Name:  Charles H. Day
                                       Title  Assistant Vice President

                                       DG BANK, DEUTSCHE
                                       GENOSSENSCHAFTSBANK, Cayman
                                       Island Branch, as a Lender

                                       By:    /s/ Linda J. O'Connell
                                       Name:  Linda J. O'Connell
                                       Title  Vice President

                                       By:    /s/ Karen A. Brinkman
                                       Name:  Karen A. Brinkman
                                       Title  Vice President



                                      S - 5


                                       SIGNET BANK, as a Lender

                                       By:    /s/ Frieda M.A. McWilliams
                                       Name:  Frieda M.A. McWilliams
                                       Title  Vice President

                                       MITSUI LEASING (U.S.A.) INC., as a
                                       Lender

                                       By:    /s/ Yuichi Kamizawa
                                       Name:  Yuichi Kamizawa
                                       Title  Vice President

                                       ARAB AMERICAN BANK, as a Lender

                                       By:    /s/ Peter Rivera
                                       Name:  Peter Rivera
                                       Title  Assistant Vice President

                                       By:    /s/ William G. Reynolds
                                       Name:  William G. Reynolds
                                       Title  Vice President


  For the purposes of Section 9:       HEALTH AND RETIREMENT
                                       PROPERTIES INTERNATIONAL, INC.

                                       By:    /s/ Ajay Saini
                                       Name:  Ajay Saini
                                       Title  Treasurer


                                       CAUSEWAY HOLDINGS INC.

                                       By:    /s/ Ajay Saini
                                       Name:  Ajay Saini
                                       Title  Treasurer


                                      S - 6


                                       SJO CORPORATION

                                       By:    /s/ Ajay Saini
                                       Name:  Ajay Saini
                                       Title  Treasurer

                                       HUB PROPERTIES TRUST

                                       By:    /s/ Ajay Saini
                                       Name:  Ajay Saini
                                       Title  Treasurer

                                       HUB ACQUISITION TRUST

                                       By:    /s/ Ajay Saini
                                       Name:  Ajay Saini
                                       Title  Treasurer

                                       HUB LA PROPERTIES TRUST

                                       By:    /s/ Ajay Saini
                                       Name:  Ajay Saini
                                       Title  Treasurer

                                       HUB REALTY FUNDING, INC.

                                       By:    /s/ Ajay Saini
                                       Name:  Ajay Saini
                                       Title  Treasurer


                                       HUB MANAGEMENT, INC.

                                       By:    /s/ Ajay Saini
                                       Name:  Ajay Saini
                                       Title  Treasurer
 

                                      S - 7




                                      HUB REALTY COLLEGE PARK, INC.

                                      By:    /s/ Ajay Saini
                                      Name:  Ajay Saini
                                      Title  Treasurer

                                      HUB REALTY I, INC.

                                      By:    /s/ Ajay Saini
                                      Name:  Ajay Saini
                                      Title  Treasurer

                                      HUB REALTY IV, INC.

                                      By:    /s/ Ajay Saini
                                      Name:  Ajay Saini
                                      Title  Treasurer

                                      HUB REALTY GOLDEN, INC.

                                      By:    /s/ Ajay Saini
                                      Name:  Ajay Saini
                                      Title  Treasurer



                                      HUB REALTY COLLEGE PARK I,
                                      LLC

                                      By:    /s/ Ajay Saini
                                      Name:  Ajay Saini
                                      Title  Treasurer

                                      S - 8