UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                    FORM 10-K

                        FOR ANNUAL AND TRANSITION REPORTS
                     PURSUANT TO SECTIONS 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

(Mark one)

[X]      ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934

For the Fiscal Year Ended December 31, 1999

                                       OR

[ ]    TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE EXCHANGE
       ACT OF 1934

For the transition period from ______________ to ______________

                        Commission File Number 001-15319

                         SENIOR HOUSING PROPERTIES TRUST
             (Exact name of registrant as specified in its charter)

                         Maryland                          04-3445278
(State or other jurisdiction of incorporation) (IRS Employer Identification No.)


400 Centre Street, Newton, Massachusetts                              02458
(Address of principal executive offices)                           (Zip Code)

                                  617-796-8350
              (Registrant's telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

        Title of each class            Name of each exchange on which registered
Common Shares of Beneficial Interest                New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:  None

         Indicate  by check  mark  whether  the  registrant:  (1) has  filed all
reports  required to be filed by Section 13 or 15(d) of the Securities  Exchange
Act of 1934 during the preceding 12 months (or for such shorter  period that the
registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days. Yes [X] No [ ]

         Indicate by check mark if disclosure of delinquent  filers  pursuant to
Item 405 of Regulation S-K is not contained  herein,  and will not be contained,
to the best of  registrant's  knowledge,  in  definitive  proxy  or  information
statements  incorporated  by  reference  in Part  III of this  Form  10-K or any
amendment to this Form 10-K. [ ]


         The aggregate  market value of the voting stock of the registrant  held
by non-affiliates was $129.0 million based on the $9 7/8 closing price per share
for such stock on the New York Stock Exchange on March 27, 2000. For purposes of
this  calculation,  12,809,237 held by HRPT Properties Trust and an aggregate of
128,458 held by the trustees and executive  officers of the registrant have been
included in the number of shares held by affiliates.

         Number of the registrant's Common Shares of Beneficial  Interest,  $.01
par value ("Shares"), outstanding as of March 27, 2000: 26,001,500.

DOCUMENTS INCORPORATED BY REFERENCE

         Part  III of this  Annual  Report  on  Form  10-K  is  incorporated  by
reference  from  our  definitive  Proxy  Statement  for the  annual  meeting  of
shareholders currently scheduled to be held on May 11, 2000.

IMPORTANT FACTORS

         This Annual Report on Form 10-K contains  statements  which  constitute
forward  looking  statements  within the  meaning of the  Securities  Litigation
Reform Act of 1995. These  statements  appear in a number of places in this Form
10-K regarding our intent, belief or expectations with respect to the outcome of
current  agreements  and  negotiations  with certain of our tenants which are in
bankruptcy  proceedings,  our  ability  to obtain  requisite  approvals  for any
agreements reached, our ability to successfully operate properties which we take
back from financially  troubled  tenants,  possible  expansion of our portfolio,
performance of our assets, our ability to make distributions, policies and plans
regarding investments, financings and other matters, the effect of the year 2000
issue,  our  ability  to  successfully  negotiate  with some of our  tenants  in
bankruptcy,  our tax status as a real estate  investment  trust,  our ability to
appropriately  balance the use of debt and equity and to access capital  markets
or  other  sources  of funds  and  statements  of  assumptions  underlying  such
statements as to intent, belief or expectations.  Readers are cautioned that any
such forward  looking  statements are not guarantees of future  performance  and
involve risks and  uncertainties  and that actual results may differ  materially
from those  contained in the forward  looking  statements as a result of various
factors.  Such factors include without  limitation the status of the economy and
the capital markets (including  prevailing interest rates),  compliance with and
changes to regulations and payment and reimbursement  policies within the health
care industry,  changes in financing terms,  competition  within the health care
industry, and changes in federal, state and local legislation.  The accompanying
information  contained in this Annual Report on Form 10-K,  including  under the
headings  "Business"  and  "Management's  Discussion  and  Analysis of Financial
Condition and Results of Operations,"  identifies  other important  factors that
could cause such differences.

         THE AMENDED  AND  RESTATED  DECLARATION  OF TRUST  ESTABLISHING  SENIOR
HOUSING  PROPERTIES TRUST,  DATED SEPTEMBER 20, 1999, A COPY OF WHICH,  TOGETHER
WITH ALL AMENDMENTS THERETO, IS DULY FILED IN THE OFFICE OF THE STATE DEPARTMENT
OF ASSESSMENTS AND TAXATION OF MARYLAND,  PROVIDES THAT THE NAME "SENIOR HOUSING
PROPERTIES  TRUST"  REFERS TO THE  TRUSTEES  UNDER THE  DECLARATION  OF TRUST AS
TRUSTEES,  BUT NOT  INDIVIDUALLY  OR PERSONALLY,  AND THAT NO TRUSTEE,  OFFICER,
SHAREHOLDER,  EMPLOYEE OR AGENT OF SENIOR HOUSING PROPERTIES TRUST SHALL BE HELD
TO ANY  PERSONAL  LIABILITY  FOR ANY  OBLIGATION  OF, OR CLAIM  AGAINST,  SENIOR
HOUSING  PROPERTIES  TRUST.  ALL PERSONS DEALING WITH SENIOR HOUSING  PROPERTIES
TRUST SHALL LOOK ONLY TO THE ASSETS OF SENIOR HOUSING  PROPERTIES  TRUST FOR THE
PAYMENT OF ANY SUM OR THE PERFORMANCE OF ANY OBLIGATION.






                                            SENIOR HOUSING PROPERTIES TRUST
                                             1999 FORM 10-K ANNUAL REPORT


                                                   Table of Contents

                                                        Part I
                                                                                                                  Page
                                                                                                             
Item 1.           Business................................................................................          1
Item 2.           Properties..............................................................................         30
Item 3.           Legal Proceedings.......................................................................         33
Item 4.           Submission of Matters to a Vote of Security Holders.....................................         33

                                                        Part II

Item 5.           Market for Registrant's Common Stock and Related Shareholder Matters....................         34
Item 6.           Selected Financial Data.................................................................         34
Item 7.           Management's Discussion and Analysis of Financial Condition and Results
                         of  Operations...................................................................         36
Item 7A.          Quantitative and Qualitative Disclosures About Market Risk..............................         40
Item 8.           Financial Statements and Supplementary Data.............................................         41
Item 9.           Changes in and Disagreements with Accountants on Accounting and
                         Financial Disclosure.............................................................         41

                                                       Part III

Item 10.          Directors and Executive Officers of the Registrant......................................          *
Item 11.          Executive Compensation..................................................................          *
Item 12.          Security Ownership of Certain Beneficial Owners and Management..........................          *
Item 13.          Certain Relationships and Related Transactions..........................................          *

                  *      Incorporated  by reference from our Proxy Statement for
                         the Annual Meeting of Shareholders  currently scheduled
                         to be held on May 11,  2000,  to be filed  pursuant  to
                         Regulation 14A.

                                                        Part IV

Item 14.          Exhibits, Financial Statement Schedules and Reports on Form 8-K.........................         42






         References  in this  Annual  Report  on Form 10-K to the  "Company"  or
"Senior Housing" include consolidated subsidiaries, unless the context indicates
otherwise.

                                     PART I

Item 1.  Business

         The Company.  Senior Housing  Properties Trust ("Senior Housing") is a
Maryland real estate  investment  trust  ("REIT") that invests in senior housing
income producing real estate,  including senior  apartments and assisted living,
congregate  care and nursing home  properties.  Senior  Housing was organized on
December 16, 1998 as a 100% owned  subsidiary of HRPT Properties Trust ("HRPT"),
a REIT which invests principally in office buildings.  On October 12, 1999, HRPT
distributed 13.2 million common shares of Senior Housing to HRPT shareholders to
create Senior  Housing as a separate  public REIT.  Senior  Housing's  principal
executive offices are located at 400 Centre Street, Newton, Massachusetts 02458,
and its telephone number is (617) 796-8350.

         As of December 31, 1999, we owned 81 properties for a total  investment
of $708.8  million and had mortgage  investments  in 12  properties  aggregating
$22.9 million,  net of loan loss reserve,  for total real estate  investments of
$731.7  million in 26 states.  The properties are described in greater detail in
"Item 2. Properties."

                                   Number of              Total Investments
State                              Properties            at December 31, 1999
- - -----                              ----------            --------------------
                                                            (in thousands)

Arizona                                 6                       $42,861
California                              8                        53,879
Colorado                                8                        34,348
Connecticut (1)                         6                        35,914
Florida                                 5                       131,990
Georgia                                 4                        12,308
Illinois                                2                        98,742
Iowa                                    6                         8,207
Kansas                                  1                         1,320
Louisiana                               1                         4,277
Maryland                                1                        33,080
Massachusetts                           4                        69,562
Michigan                                2                         9,086
Missouri                                2                         3,788
Nebraska                               10                        10,627
New Jersey                              1                        13,007
New York                                1                        10,700
North Carolina                          3                         6,389
Ohio                                    1                         3,445
Pennsylvania                            1                        15,598
South Dakota                            3                         7,589
Texas                                   1                        12,410
Virginia                                3                        57,666
Washington                              2                        19,542
Wisconsin                               8                        28,098
Wyoming                                 3                         7,245
                                     ----                      --------
Total Investments                      93                      $731,678
                                     ====                      ========

(1) Three of these properties were sold after December 31, 1999.

                                       1


         We believe that the aging of the United States population will increase
the demand for existing senior  apartments,  congregate  communities,  assisting
living properties and nursing homes and encourage development of new properties.
Our basic  business plan is to profit from this  increasing  demand in two ways.
First,  we intend to purchase  additional  properties  and lease them at initial
rents that are greater than our costs of acquisition capital.  Second, we intend
to structure  leases that provide for periodic rental increases based in part on
gross  operating  revenue  increases at our  properties.  Our current  operating
environment,  though,  is  challenging.  The long  term care  industry  has been
financially  devastated by Medicare payment reductions,  increased  governmental
regulation,  rapid growth of the competing  assisting  living industry and tight
capital markets. The current difficulties being faced by the healthcare industry
have severely affected some of our tenants.

         Our business plan  contemplates  investment  in properties  which offer
four types of senior  housing  accommodations,  including some  properties  that
combine more than one type in a single building or campus.

         Senior Apartments.  Senior apartments are marketed to residents who are
generally capable of caring for themselves. Residence is generally restricted on
the basis of age.  Purpose built  properties  may have special  function  rooms,
concierge  services,  high levels of security and  centralized  call buttons for
emergency use.  Tenants at these  properties  who need  healthcare or assistance
with the activities of daily living are expected to contract  independently  for
those services with homemakers or home healthcare companies.

         Congregate  Communities.  Congregate  communities  also  provide a high
level of privacy to residents and require  residents to be capable of relatively
high degrees of independence.  Unlike a senior apartment property,  a congregate
community  usually  bundles  several  services  as  part  of a  regular  monthly
charge--for  example,  one or two meals per day in a central dining room, weekly
maid service or a social director.  Additional  services are generally available
from staff  employees on a  fee-for-service  charge  basis.  In some  congregate
communities,  separate parts of the property are dedicated to assisted living or
nursing services.

         Assisted Living  Properties.  Assisted living  properties are typically
comprised of one bedroom suites which include  private  bathrooms and efficiency
kitchens.  Services  provided  usually  include three meals per day in a central
dining  room,  daily  housekeeping,  laundry,  medical  reminders  and  24  hour
availability  of assistance with the activities of daily living such as dressing
and bathing.  Professional nursing and healthcare services are usually available
at the facility on call or at regularly  scheduled times.  Since the early 1990s
there  has  been  explosive  growth  in the  number  of small  public  companies
developing  purpose built assisted living  properties.  Many of those properties
have  recently  been  completed  and  are now  fully  occupied  and  appropriate
investments for us.

         Nursing Homes.  Nursing homes generally  provide  extensive nursing and
healthcare  services  similar to those available in hospitals,  without the high
costs  associated  with operating  theaters,  emergency  rooms or intensive care
units. A typical purpose built nursing home includes mostly two-bed rooms with a
separate  toilet in each room and shared  dining and  bathing  facilities.  Some
private  rooms are often  available  for those  residents  who can afford to pay
higher rates or for  patients  whose  medical  conditions  require  segregation.
Nursing homes are generally  staffed by licensed nursing  professionals 24 hours
per day.

         During the past few years nursing home owners and operators  have faced
two significant business challenges.  First, the rapid expansion of the assisted
living  industry  which  started in the early  1990s has  attracted  a number of
residents away from nursing homes. This was especially  significant  because the
residents who elected  assisted living  facilities had often previously been the
most profitable residents in the nursing  homes--residents who required a lesser
amount  of care  and who were  able to pay  higher  private  rates  rather  than
government rates.

         The second major  challenge  arose as a result of Medicare and Medicaid
cost containment laws beginning in 1994,  particularly 1997 federal  legislation
that required the Medicare  program to implement a prospective  payment  program
for various subacute services provided in skilled nursing homes.  Implementation

                                       2

of this Medicare prospective payment program began on July 1, 1998. Prior to the
prospective  payment  program  Medicare paid nursing home  operators  based upon
audited  costs for  services  provided.  The  prospective  payment  system  sets
Medicare  rates based upon  government  estimated  costs of  treating  specified
medical conditions. Although it is possible that a nursing home may increase its
profit if it is able to provide  quality  services at below  average  costs,  we
believe that the effect of the new Medicare rate setting  methodology will be to
reduce the  profitability of Medicare  services in nursing homes. This belief is
based on similar Medicare changes that were implemented for hospitals during the
1980s.

         Tenants and Leases. Our financial  condition  depends,  in part, on the
financial  condition  of our  tenants.  About  46% of our  historical  rents are
received  from  Marriott  International,  Inc.  and  some  of  its  subsidiaries
("Marriott") and Brookdale Living Communities, Inc. and some of its subsidiaries
("Brookdale").  Our properties  leased to these  operators  predominantly  offer
independent  and  assisted  living  services;  and almost all of the revenues of
these  properties  are paid by residents from private  resources.  As previously
announced, our other large tenants, Integrated Health Services, Inc. ("IHS") and
Mariner  Post-Acute  Network,  Inc.  ("Mariner"),  which  on  a  combined  basis
represent about 48% of our historical rents, filed for bankruptcy in early 2000.
More  information  concerning  those tenants is set forth below under  "Business
Developments--Tenant  Financial Condition." Properties leased to IHS and Mariner
are predominantly nursing homes.

         Our leases are so called  "triple net" leases which require the tenants
to  maintain  our  properties  during the lease  terms and to  indemnify  us for
liability which may arise by reason of our ownership of the properties.

         We own 14 congregate care  communities  and assisted living  properties
located in seven  states  with 3,950  units that are leased to  subsidiaries  of
Marriott.  Marriott  is  a  NYSE  listed  company  whose  major  businesses  are
developing,  operating and managing hotels,  senior housing  properties and time
share resorts.  The annual rent under this lease is $30.9 million,  which is 34%
of our  historical  total annual rent, and the lease provides for rent increases
equal to 4.5% of increases  in gross  revenues of the  properties.  Marriott has
guaranteed  all of these lease  obligations.  Our historic  investment  in these
properties is $325.5 million. The current lease expiration is 2013, and Marriott
has four all-or-none renewal options for five years each.

         The following table presents summary financial  information of Marriott
from its Annual Report on 10-K for the year ended December 31, 1999.

          Summary Financial Information of Marriott International, Inc.
                                  (in millions)

                                         As of or for the year ended
                                ----------------------------------------------
                                 January 2,       January 1,      December 31,
                                    1998            1999              1999
                                -----------       ----------      ------------
Sales..........................   $7,236            $7,968          $8,739
Net income.....................      324               390             400
Total assets...................    5,161             6,233           7,324
Debt...........................      422             1,267           1,676

         We own four congregate care communities located in four states with 829
units that are leased to a subsidiary of Brookdale. Brookdale is a Nasdaq listed
company whose principal business is operating senior housing and congregate care
communities.  The annual rent under this lease is $11.2 million, which is 12% of
our  historical  total annual rent,  and the lease  provides for rent  increases
equal to 10% of increases in gross revenues of the properties  starting in 1999.
Brookdale has guaranteed all of these lease obligations. Our historic investment
in these properties is $101.9 million. The current lease expiration is 2019, and
Brookdale has two all-or-none renewal options for twenty-five years each.

         We own one nursing  home with 150 units that is leased to a  subsidiary
of Genesis Health Ventures,  Inc. ("Genesis").  Genesis is a NYSE listed company
whose major businesses are operating nursing homes,

                                       3


congregate care  communities and assisting  living  properties.  The annual rent
under this lease is $1.4 million,  which is two percent of our historical  total
annual rent, and the lease  provides for annual rent  increases of $13,000.  Our
historic  investment  in this  property  is $13.0  million.  The  current  lease
expiration  is 2005,  and Genesis has two  all-or-none  renewal  options for ten
years each and one for five years.

         In addition to the tenants  described  above,  we currently lease three
nursing homes located in three states with 423 units to three  separate  private
companies. These leases require total annual rent of $1.3 million.

         We  currently  own 27 nursing  homes and three senior  apartments  with
3,205 units  located in nine states that are leased to  subsidiaries  of IHS. In
addition,  we have mortgage  investments  secured by 12 nursing homes with 1,070
units located in three states that are operated by IHS.  IHS's major  businesses
are operating  nursing homes and providing home  healthcare  services.  These 42
properties  are divided  into two pools,  and the  obligations  under leases and
mortgages  within each pool are subject to cross  default and  collateralization
covenants  with all other  properties  in the same pool.  The annual  rent under
these  leases of $22.8  million  and the  interest  of $4.1  totaled  30% of our
historical  total  annual  rent.  IHS has  guaranteed  all of these  leases  and
mortgage  obligations.  IHS and  its  subsidiaries  which  are  our  tenants  or
mortgagors    are   subject   to   bankruptcy    proceedings.    See   "Business
Developments--Tenant  Financial  Condition."  The current lease  expirations are
2006 in the case of one pool and  2010 in the case of the  other  (in each  case
with renewal options), subject to the effect of the bankruptcy proceedings.  Our
investment in these  properties,  after an impairment  loss  write-down and loan
loss reserve, is $185.2 million.

         The following  table present summary  financial  information of IHS for
the latest  period  available  from its Annual  Report on Form 10-K for the year
ended December 31, 1998, and Quarterly  Report on Form 10-Q for the period ended
September 30, 1999.


                   Summary Financial Information of Integrated Health Services, Inc.
                                             (in millions)

                                                                                As of or for the nine
                                               As of or for the year ended         months ended
                                                      December 31,                  September 30,
                                             -----------------------------      ---------------------
                                               1996      1997       1998          1998        1999
                                             -------   --------   --------      --------    --------
                                                                            
Total revenue ............................   $ 1,204   $ 1,403    $ 2,972        $ 2,253    $ 1,904
Earnings (loss) from continuing operations        48         3        137            126     (1,831)
Net earnings (loss) ......................        46       (34)       (68)           (79)    (1,831)
Total assets .............................               5,002      5,393                     3,596
Debt .....................................               3,219      3,383                     3,536


         We currently own 24 nursing homes and two congregate  care  communities
with 3,482  units  located  in six states  leased to  subsidiaries  of  Mariner.
Mariner's  principal  business is operating  nursing  homes.  The $16.7  million
annual rent under this lease represents about 18% of our historical total annual
rent.  Mariner has  guaranteed all of the lease  obligations.  Our investment in
these properties  after an impairment loss write-down is $80.7 million.  Mariner
and  its   subsidiaries   which  are  our  tenants  are  subject  to  bankruptcy
proceedings.  See  "Business   Developments--Tenant  Financial  Condition."  The
current lease term with Mariner expires in 2013 (with renewal options),  subject
to the effect of the  bankruptcy  proceedings.  We have  reached an agreement in
principle with Mariner  involving,  among other things,  the  termination of the
lease of the properties,  our assumption of operating responsibilities for 17 of
the properties  and our conveyance of title to the remaining five  properties to
Mariner.  The  remaining  four  nursing  homes are now  subleased to two private
companies  and we expect  to  negotiate  with  these  two  subtenants  for their
continued  operations of those  properties.  Our  agreement is  contingent  upon
approval of Mariner's  creditors committee and the bankruptcy court and required
regulatory approvals.

                                       4


         Other terms of our leases have included and may in the future generally
include the following:

         Cross Default.  When we lease more than one property to a single tenant
or a group of affiliated tenants all those leases are cross defaulted.

         All or None Renewal Options.  When we lease more than one property to a
single tenant or a group of affiliated  tenants,  lease renewal options may only
be exercised on an all or none basis.

         Maintenance and Alterations.  Our tenants are required to maintain,  at
their  expense,  the  leased  properties  in good  order and  repair,  including
structural  and  nonstructural  maintenance.  Except  in the case of  properties
leased to Marriott,  capital  alterations  and additions to any leased  property
which  exceed a  threshold  amount of  aggregate  cost may only be made with our
prior consent.  Any  alterations  or  improvements  made to any leased  property
during the terms of the leases become our property, subject to our obligation to
pay to the tenants  unamortized  costs at lease  termination.  At the end of the
leases,  our tenants are  required  to  surrender  their  leased  properties  in
substantially  the same  condition as existed on the  commencement  dates of the
leases,  subject to any permitted  alterations  and subject to ordinary wear and
tear.

         Assignment.  Our consent is generally  required for any  assignment  or
sublease of our  properties.  In the event of a subletting,  the initial  tenant
remains liable under the lease and all  guarantees and other security  remain in
place.

         Environmental  Matters. Our tenants are required,  at their expense, to
remove and  dispose of any  hazardous  substance  at the  leased  properties  in
compliance with all applicable environmental laws and regulations and to pay any
costs we incur  in  connection  with  removal  and  disposal.  Each  tenant  has
indemnified us for any claims  asserted as a result of the presence of hazardous
substances  at any  property  and from a violation  or alleged  violation of any
applicable environmental law or regulation.

         Indemnification  and Insurance.  Each tenant has agreed to indemnify us
from all claims arising from our ownership or their use of our properties.  Each
tenant is required to maintain insurance on our properties covering:

     o    comprehensive  general  liability  for  damage to  property  or bodily
          injury arising out of the ownership,  use, occupancy or maintenance of
          the properties;

     o    commercial  property "all risk" liability for damage to  improvements,
          merchandise,  trade  fixtures,  furnishings,  equipment  and  personal
          property;

     o    workers' compensation liability;

     o    business interruption loss;

     o    in some cases, medical malpractice; and

     o    other losses customarily insured by businesses similar to the business
          conducted at our properties.

The  leases  require  that we be  named as an  additional  insured  under  these
policies.

         Damage, Destruction or Condemnation. In the event any of our properties
is damaged by fire,  or other  casualty or is taken for a public use, we receive
all  insurance  or taking  proceeds  and our  tenants  are  required  to pay any
difference between the amount of proceeds and the historical investment by us or
HRPT  in the  affected  property.  In  the  event  of  material  destruction  or
condemnation,  some tenants  have a right to purchase the affected  property for
amounts at least equal to our or HRPT's historical investment in the property.

                                       5


         Events of Default Events of default include:

     o    the failure of the tenant to pay rent when due;

     o    the  failure  of  the  tenant  to  perform  key  terms,  covenants  or
          conditions  of its lease and the  continuance  thereof for a specified
          period after written notice;

     o    the occurrence of events of insolvency with respect to the tenant;

     o    the failure of the tenant to maintain required insurance coverages; or

     o    the  revocation  of any material  license  necessary  for the tenant's
          operation of our property.

         Remedies.  Upon the occurrence of any event of default, we may (subject
to applicable law):

     o    terminate the affected lease and accelerate the rent;

     o    terminate  the  tenant's  rights to the affected  property,  relet the
          property and recover from the tenant the difference between the amount
          of rent which would have been due under the  applicable  lease and the
          rent received under the reletting; and

     o    make any payment or perform any act  required to be  performed  by the
          tenant under its lease.

The defaulting tenant is obligated to reimburse us for all payments made and all
costs and expenses  incurred in  connection  with any exercise of the  foregoing
remedies.

         Ground  Lease  Terms.  The land  underlying  two of our  properties  is
leased.  Our leases  require  our  tenants to pay and  perform  all  obligations
arising under these ground  leases.  These ground  leases  terminate on 2086 and
2079. The annual rents payable under the ground leases in 1999 totaled $138,100.
If our tenants fail to pay the  applicable  ground rent, we may have to do so in
order to protect our investment in these properties.

         The following discussion sets forth our policies regarding investments,
dispositions,  financings  and other  activities.  The board of trustees has set
these policies and although there is no current intention to do so, the board of
trustees  may  amend or  revise  these  policies  at any time  without a vote of
shareholders.

Investment Policies

         Acquisitions.  Our investment  goals are to acquire  additional  senior
apartments,  congregate  communities,  assisted  living  properties  and nursing
homes, primarily for income and secondarily for their appreciation potential. In
making future acquisitions, we will consider a range of factors including:

     o    the acquisition price of the proposed property;

     o    the estimated replacement cost of the proposed property;

     o    proposed lease terms;

     o    the  financial  strength  and  operating  reputation  of the  proposed
          tenant;

     o    historical and projected cash flows of the property to be acquired;

     o    the  location  and  competitive  market  environment  of the  proposed
          property;

                                       6


     o    the physical  condition of the proposed property and its potential for
          redevelopment or expansion; and

     o    the price segment and payment  sources in which the proposed  property
          is operated.

         We intend to acquire properties which will enhance the diversity of our
portfolio in respect to tenants,  types of services  provided and locations.  We
have no policies which specifically limit the percentage of our assets which may
be  invested  in any  individual  property,  in any  one  type of  property,  in
properties  leased to any one tenant or in  properties  leased to an  affiliated
group of tenants.

         Other  Investment  in Real  Estate.  We emphasize  direct  wholly owned
investments in fee interests.  However,  circumstances may arise in which we may
invest in leaseholds, joint ventures, mortgages and other real estate interests.
We may invest in real estate joint  ventures if we conclude  that by doing so we
may benefit from the  participation  of  co-venturers or that our opportunity to
participate  in the  investment  is  contingent  on the use of a  joint  venture
structure.  We may  invest  in  participating,  convertible  or  other  types of
mortgages  if we conclude  that by doing so we may benefit from the cash flow or
appreciation in the value of a property which is not available for purchase.

Disposition Policies

         From time to time we may consider  the sale of one or more  properties.
Future disposition decisions,  if any, will be made based on a number of factors
including the following:

     o    the proposed sale price;

     o    the strategic fit of the property with the rest of our portfolio;

     o    potential  opportunities  to  increase  revenues by  reinvesting  sale
          proceeds;

     o    the  potential  for,  or  the  existence  of,  any   environmental  or
          regulatory problems affecting a particular property;

     o    our alternative capital needs; and

     o    the  maintenance  of our  qualification  as a REIT under the  Internal
          Revenue Code.

         We contemplate certain dispositions in connection with our negotiations
with  two  tenants   which  are  in   bankruptcy   proceedings.   See  "Business
Developments--Tenant Financial Condition."

Financing Policies

         We have a $350 million  bank credit  facility.  The  facility  requires
payment of interest  only at LIBOR plus a premium prior to maturity on September
15,  2002.  Outstanding  borrowings  under the  facility  were $200  million  at
December 31, 1999. This bank credit facility is secured by first mortgages upon,
and a collateral  assignment  of leases from,  18  properties.  This bank credit
facility has several  covenants  typically  found in revolving  loan  facilities
including covenants to maintain a minimum net worth and minimum collateral value
and which prohibit us from incurring debt in excess of 60% of its total capital.

         We use this bank credit facility to fund  acquisitions  and for working
capital.  Periodically,  we expect to repay  amounts drawn under the bank credit
facility   with   proceeds  of  equity  and  long  term  debt   offerings.   Our
organizational  documents do not limit the amount of  indebtedness we may incur.
At present we expect to maintain a capital  structure in which our debt will not
exceed 60% of our total capital.  We will consider future equity offerings when,
in our judgment,  doing so will improve our capital structure without materially
adversely

                                       7


affecting the market value of its shares.  Unless we achieve an investment grade
rating at some  future  date,  we  expect  that the least  costly  debt  capital
available  to us will be secured debt and that most of our debt will be secured.
In the  future,  we may modify our current  financing  policies in light of then
current  economic  conditions,  relative  costs  of  debt  and  equity  capital,
acquisition  opportunities and other factors;  and our intended ratio of debt to
total capital may change.

Policies with Respect to Other Activities

         We operate in a manner that will not subject us to regulation under the
Investment  Company Act of 1940.  Except for the possible  acquisition  of other
REITs which are engaged in similar  businesses,  we do not  currently  intend to
invest in the  securities  of other  companies  for the  purpose  of  exercising
control,  to underwrite  securities of other  companies or to trade  actively in
loans or other investments.

         We may make investments other than as previously described, although we
do not currently  intend to do so. We have  authority to repurchase or otherwise
reacquire  our shares or other  securities we issue and may do so in the future.
In the future, we may issue shares or other securities in exchange for property.
Also, although we have no current intention to do so, we may make loans to third
parties,  including to our trustees and officers and to joint  ventures in which
we participate.

Business Developments

Spin-Off

         In September 1999, our registration statement on Form S-11 was declared
effective by the Securities and Exchange Commission. As a result, on October 12,
1999, a majority  ownership of our shares were distributed to HRPT  shareholders
through a special  distribution (the "Spin-Off").  Subsequently,  both companies
trade separately on the New York Stock Exchange.

Tenant Financial Condition

         Three of our tenants,  The Frontier Group, Inc.  ("Frontier"),  Mariner
and IHS, have filed for protection under bankruptcy laws. Frontier filed in July
1999,  Mariner filed in January 2000 and IHS filed in February 2000.  Bankruptcy
laws may allow  our  tenants  relief or  discharge  them  from  their  financial
obligations  to us. For 1999,  rental  income and mortgage  interest  related to
Frontier,  Mariner and IHS was $2.2 million,  $15.4  million and $26.6  million,
respectively.   At  December  31,  1999,  our  historical  investments,   before
impairment loss  recognition  and net of accumulated  depreciation in properties
operated by these three tenants,  were $10.0  million,  $68.3 million and $136.9
million,  respectively. We also had mortgage investments,  before loss reserves,
related to properties operated by IHS of $36.6 million at December 31, 1999.

         We have concluded that  impairment  indicators are present with respect
to properties operated by these tenants and have prepared undiscounted cash flow
projections for each of the properties.  For purposes of these  projections,  we
have assumed that rents on some  properties may be modified and that some of the
leases may be terminated after which we will operate the properties for a period
of time and, ultimately, sell them. In addition, a third party not in bankruptcy
is responsible for the lease  obligations of some of the properties  operated by
IHS. We have assumed that the guarantor will honor these lease obligations.  The
undiscounted cash flow projections  reflect the expected rents to be earned over
the lease term and the expected cash flows earned from  operating the properties
for a  period  of time  plus  the  proceeds  from  assumed  future  sales of the
properties.  Cash flows during the period in which we may operate the properties
are estimated  based on the historical  performance of each property,  excluding
rent paid to us.  Projected  sale prices are based on an estimated per bed value
consistent  with industry  practice and reflect  prices that we have observed in
recent transactions.  Based on these undiscounted cash flow projections, we have
concluded that some of our real estate and mortgage investments were impaired as
of December 31, 1999.  Based on our estimated  fair values net of selling costs,
we have  written  down the  carrying  value of these  real  estate  investments,
including investments leased to an affiliate,

                                       8


Advisors  Healthcare Group,  Inc., and operated by IHS, as of December 31, 1999,
by recording an  impairment  loss  write-down in the  accompanying  consolidated
statement of income of $15.5 million. In addition,  we have recorded a loan loss
reserve  of $14.5  million  related to the  mortgage  investment  we  considered
impaired.  At December 31, 1999 after impairment losses,  loan loss reserves and
net of accumulated  depreciation,  the net book value of the properties operated
by  Frontier,  IHS and  Mariner  were $10.0  million,  $147.5  million and $65.2
million,  respectively.  It is reasonably possible that estimates of future cash
flows could be reduced significantly  depending on the outcome of the bankruptcy
proceedings  or if the  non-bankrupt  third  party  should  fail  to  honor  its
obligations.  As a  result,  additional  losses  could be  recognized  in future
periods and these amounts could be material.

         In February  2000,  we sold all of the  properties  that were leased to
Frontier for $13.0 million.  We are continuing  pursuing claims against Frontier
and other parties for breach of its leases and for rental arrearages. The amount
of net  gain,  if any,  which  may be  realized  from the  sale of the  Frontier
properties  will depend upon the outcome of these claims.  The amount of gain or
loss to be  realized  as a result  of this  transaction  is not  expected  to be
material.  Because these  properties  have been sold, we will no longer  receive
rental income from these properties.

         In March 2000,  we reached an agreement  in  principle  with Mariner as
follows:

     o    Mariner's  lease  obligations  for all 26 properties  which we own and
          lease to Mariner will be terminated.

     o    Approximately  $24.0 million of cash and  securities  which we hold to
          secure Mariner's obligations will be retained by us.

     o    We  will  assume  operating   responsibilities  for  17  of  these  26
          properties.  Title to five of these  properties will be transferred to
          Mariner which will continue the operations. The remaining four nursing
          homes are now  subleased  to two  private  companies  and we expect to
          negotiate with these two subtenants for their continued  operations of
          those properties.

         Our  agreement  with Mariner is  contingent  upon approval by Mariner's
creditors  committee and the Delaware  Bankruptcy  Court before which  Mariner's
bankruptcy  is pending and required  regulatory  approvals  from various  states
where  affected  nursing  homes are  located.  If this  agreement is approved we
expect that we may realize gains and that our future earnings and cash flows may
be less than the rent previously  earned from the Mariner leases,  at least on a
short term basis. This agreement is contingent upon third party approvals beyond
our  control.  If and when  this  agreement  is  implemented  it may  result  in
additional material gains or losses.

         We are  currently in  negotiations  with IHS. The current  negotiations
include, but are not limited to, the possibilities that we will sell some of the
properties,  that lease or mortgage  terms may be changed,  that new tenants may
begin  operations of properties,  that  properties may be operated by us for our
own account or that  mortgage  obligations  due to us may be released  for other
compensation.   We  may  recognize   additional   gains  or  losses  when  these
negotiations are completed and the additional gains or losses may be material.

Investments

         There were no new investments made during 1999.

The Investment Manager

         REIT  Management & Research,  Inc.  ("REIT  Management")  is a Delaware
corporation  owned by Gerard M. Martin and Barry M. Portnoy.  REIT  Management's
principal   executive  offices  are  located  at  400  Centre  Street,   Newton,
Massachusetts  02458, and its telephone  number is (617) 332-3990.  Simultaneous
with

                                       9

the Spin-Off,  we entered into a new  investment  advisory  agreement  with REIT
Management,  pursuant to which REIT Management provides  investment,  management
and  administrative  services  to us. The  agreement  has been  renewed  through
December 31, 2000. REIT  Management also acts as the investment  manager to HRPT
and has other business interests. The Directors of REIT Management are Gerard M.
Martin,  Barry M. Portnoy and David J. Hegarty.  The officers of REIT Management
are David J. Hegarty,  President and Secretary,  John G. Murray,  Executive Vice
President,  John Popeo,  Treasurer,  and Ajay Saini,  John A.  Mannix,  David M.
Lepore,  Thomas M. O'Brien and  Jennifer B. Clark,  Vice  Presidents.  Gerard M.
Martin and Barry M. Portnoy are our managing trustees,  and David J. Hegarty and
Ajay Saini are our officers.

Employees

         As of March 27,  2000,  we had no  employees.  REIT  Management,  which
administers our day-to-day operations, had about 200 full-time employees.

Regulation and Reimbursement

         The  tenants  and  borrowers  who  operate  our  properties,  including
long-term care facilities,  congregate communities,  assisted living centers and
senior  apartments,  must  comply with  federal,  state and local  statutes  and
regulations in order to operate the properties. The health care industry depends
significantly  upon federal and  federal/state  programs for revenues  and, as a
result,  is vulnerable  to the budgetary  policies of both the federal and state
governments.

Government Regulations and Rate Setting

         Senior  Apartments.  Generally,  government  programs  do not  pay  for
housing  in  senior  apartments.  Rents  are paid  from the  residents'  private
resources.  Accordingly, the government regulations that apply to these types of
properties are generally limited to zoning,  building and fire codes,  Americans
with  Disabilities  Act  requirements  and other life  safety  type  regulations
applicable to residential real estate.  Government rent subsidies and government
assisted  development  financing for low income senior housing are exceptions to
these general  statements.  The development  and operation of subsidized  senior
housing properties are subject to numerous governmental regulations. While it is
possible  that we may  purchase  and  lease  some  subsidized  senior  apartment
properties,  we do not expect these investments to be a major part of our future
business, and today we own no properties where rent subsidies are applicable.

         Congregate   Communities.   We  understand  that  generally  government
benefits are not available to congregate communities and the resident charges in
these properties are paid from private  resources.  However, a number of Federal
Supplemental  Security Income program  benefits pay housing costs for elderly or
disabled residents to live in these types of residential facilities.  The Social
Security Act requires  states to certify  that they will  establish  and enforce
standards  for any category of group living  arrangement  in which a significant
number of supplemental security income residents reside or are likely to reside.
Categories of living  arrangements which may be subject to these state standards
include congregate facilities and assisted living properties. Because congregate
communities  usually offer common dining facilities,  in many locations they are
required  to  obtain  licenses  applicable  to food  service  establishments  in
addition  to  complying  with  land use and life  safety  requirements.  In many
states, congregate communities are licensed by state health departments,  social
service  agencies,  or offices on aging with jurisdiction over group residential
facilities for seniors. To the extent that congregate communities maintain units
in which  assisted  living or nursing  services  are  provided,  these units are
subject to applicable state regulations.  In some states,  insurance or consumer
protection  agencies  regulate  congregate  communities  in which  residents pay
entrance fees or prepay other costs.

         Assisted  Living.  According to the  National  Academy for State Health
Policy,  39 states  provide  Medicaid  payments for  residents in some  assisted
living   properties   under   waivers   granted  by  the  Health  Care   Finance
Administration  of the U.S.  Department  of Health and Human  Services  or under
Medicaid state plans and three other states are planning to do so. Because rates
paid to assisted living property  operators are lower

                                       10

than rates paid to nursing home operators some states use this waiver program as
a means of lowering  the cost of  services  for  residents  who may not need the
higher  intensity  of medical  care  provided  in  nursing  homes.  States  that
administer  Medicaid programs for assisted living facilities are responsible for
monitoring  the  services  at  and  physical  conditions  of  the  participating
properties.  Different  states apply different  standards in these matters,  but
generally we believe  these  monitoring  processes  are similar to the concerned
states' inspection processes for nursing homes.

         Because  of the large  number  of states  using  Medicaid  to  purchase
services at assisted living properties,  it is not surprising that a majority of
states  have  adopted   licensing   standards   applicable  to  assisted  living
facilities. The National Academy for State Health Policy reported in November of
1999  that 29  states  had  implemented  licensing  standards  specifically  for
assisted living, rules were being drafted in another three states and another 11
states were  currently  studying the regulation of assisted  living  facilities.
State regulatory models vary; there is no national  consensus on a definition of
assisted living,  and no uniform  approach by the states to regulating  assisted
living  facilities.  Some state  licensing  standards  apply to assisted  living
facilities whether or not they accept Medicaid funding.  Moreover,  a 1998 study
by the  National  Academy for State  Health  Policy  found that  several  states
require  certificates of need from state health planning  authorities before new
assisted  living  properties  may be  developed,  and three  states have adopted
moratoria on the  development of new assisted  living  facilities.  Based on our
analysis of current  economic and  regulatory  trends,  we believe that assisted
living properties that become dependent upon Medicaid payments for a majority of
their revenues will decline in value because Medicaid rates will fail to keep up
with increasing costs. For the same reason, we also believe that assisted living
properties  located in states that adopt  certificate  of need  requirements  or
otherwise  restrict the  development  of new  assisted  living  properties  will
increase in value because these  limitations  upon  development will help ensure
higher occupancy and higher  non-governmental rates.  Accordingly,  we intend to
focus  new  investments  in  assisted  living  properties  that  are not  overly
dependent  upon  governmental  revenues  and that are in areas  where  there are
barriers to competition created by certificate of need laws or otherwise.

         Two federal  government  studies  were  recently  completed  to provide
background information and make recommendations regarding the regulation of, and
the  possibility  of increased  governmental  funding  for, the assisted  living
industry.  In April 1999, the General  Accounting  Office issued a report to the
Senate  Special  Committee on Aging and the Committee  held hearings on consumer
protection  and quality of care issues in assisted  living  facilities.  The GAO
studied  assisted  living  facilities  in four  states  and found a  variety  of
residential settings serving a wide range of resident health and care needs. The
GAO found  that  providers  often give  consumers  insufficient  information  to
determine  whether a  particular  facility  can meet their  needs and that state
licensing and oversight  approaches vary widely. The GAO anticipates that as the
states  increase  the  use of  Medicaid  to pay  for  assisted  living,  federal
financing will likewise grow, and these trends will focus more public  attention
on the place of assisted  living in the  continuum  of  long-term  care and upon
state standards and compliance  approaches.  The second study, a national survey
of assisted living facilities,  was funded by the Department of Health and Human
Services'  Assistant  Secretary for Planning and  Evaluation  and is expected to
result in  additional  reports which will touch upon all aspects of the assisted
living  industry  including  quality of care and  financing.  The 1998  National
Academy for State Health Policy study  referenced above and an April 1999 report
on the national  survey of assisted  living  facilities  are part of this second
study.  We cannot  predict  whether  these  studies will result in  governmental
policy changes or new  legislation,  or what impact any changes may have.  Based
upon our analysis of current economic and regulatory  trends,  we do not believe
that the federal government is likely to have a material impact upon the current
regulatory  environment in which the assisted living industry operates unless it
also undertakes expanded funding obligations; and we do not believe a materially
increased financial  commitment from the federal government is presently likely.
However,  we do anticipate that assisted living  facilities will increasingly be
licensed  and  regulated  by the  various  states,  and that with the absence of
federal standards, the states' policies will continue to vary widely.

         Nursing Homes. About 67% of all nursing home revenues in 1997 came from
government Medicare and Medicaid programs. Nursing homes are also among the most
highly regulated  businesses in the country.  The federal and state  governments
regularly  monitor the quality of care  provided at nursing  homes and regularly
inspect the  physical  condition  of nursing  home  properties.  These  periodic
inspections   and   occasional   changes  in

                                       11

life safety and  physical  plant  requirements  sometimes  require  nursing home
owners  to  spend  money  for  capital  improvements.   These  mandated  capital
improvements  have in the past usually  resulted in Medicare  and Medicaid  rate
adjustments,  albeit on the basis of amortization of expenditures  over extended
useful lives of the improvements.  However,  under the new Medicare  prospective
payment  system,  which began being phased in over three years starting in 1998,
capital  costs  are  part of the  prospective  rate  and  will  not be  facility
specific.  Other recent legislative and regulatory actions with respect to state
Medicaid  rates and the  Medicare  prospective  payment  system are limiting the
reimbursement levels for some nursing home and other eldercare services.  At the
same time federal  enforcement  and  oversight of nursing  homes is  increasing,
thereby making  licensing and  certification  of these facilities more rigorous.
These actions have adversely affected the revenues and increased the expenses of
many nursing home operators, including several of our tenants.

         The federal  Health Care Financing  Administration,  HCFA, has begun to
implement an  initiative  to increase  the  effectiveness  of  Medicare/Medicaid
nursing facility survey and enforcement  activities.  HCFA's initiative  follows
its July  1998  report  to  Congress  on the  effectiveness  of the  survey  and
enforcement  system,  several  March 1999 reports by HCFA's  Office of Inspector
General  concerning  quality  of care in  nursing  homes,  a July  1998  General
Accounting  Office  investigation  which found  inadequate care in a significant
proportion  of  California  nursing  homes,  and a March 1999 GAO  report  which
recommended that HCFA and the states strengthen their compliance and enforcement
practices to better ensure that nursing homes provide adequate care. In 1998 and
1999, the Senate Special Committee on Aging held hearings on these issues.  HCFA
is taking steps to focus survey and  enforcement  efforts at nursing  homes with
repeat  violations  of  Medicare/Medicaid  standards,  including  chain-operated
facilities with patterns of noncompliance. HCFA also is requiring state agencies
to use  enforcement  sanctions and remedies more promptly and  effectively  when
substandard care is identified. HCFA is increasing its oversight of state survey
agencies.  In addition HCFA has adopted new  regulations  expanding  federal and
state authority to impose civil money  penalties in instances of  noncompliance.
Medicare/Medicaid  survey  results for each nursing home are being posted on the
internet.  Federal  efforts to target  fraud and abuse by Medicare  and Medicaid
providers have also increased. An adverse determination  concerning any tenant's
license or eligibility for Medicare or Medicaid  reimbursement or its compliance
with applicable  federal or state  regulation may adversely affect such operator
and its  affiliates  and may  restrict  its  ability  to pay rent  and  mortgage
interest.

         Most  states  also  limit the  number  of  nursing  homes by  requiring
developers to obtain  certificates  of need before new  facilities may be built.
Even  in  those  states  such as  California  and  Texas  that  have  eliminated
certificate  of need laws,  the state health  authorities  usually have retained
other means of limiting  new nursing home  development.  Examples of these other
means are the use of moratoria, licensing laws or limitations upon participation
in the state Medicaid program.  We believe that these  governmental  limitations
generally make nursing home  properties  more valuable by extending their useful
lives and limiting competition.

         A number of  legislative  proposals  that would affect major reforms of
the health care system have been  introduced  in  Congress,  such as  additional
Medicare and Medicaid reforms and cost containment  measures.  We cannot predict
whether any of these legislative  proposals will be adopted or, if adopted, what
effect,  if  any,  these  proposals  would  have  on our  business,  lessees  or
mortgagors.

Competition.

         We compete with other real estate  investment  trusts  which  regularly
seek attractive investment  opportunities in senior housing facilities.  We also
compete with banks, non-bank finance companies,  leasing companies and insurance
companies  which invest in this type of real estate.  Some of these  competitors
have resources that are greater than ours and have lower costs of capital.

                                       12


                        FEDERAL INCOME TAX CONSIDERATIONS

         The following  summary of federal income tax and ERISA  consequences is
based on  existing  law,  and is  limited  to  investors  who own our  shares as
investment  assets  rather than as inventory  or as property  used in a trade or
business.  The summary does not discuss the  particular  tax  consequences  that
might be relevant  to you if you are subject to special  rules under the federal
income tax law, for example if you are:

     o    a bank, life insurance company, regulated investment company, or other
          financial institution,

     o    a broker or dealer in securities or foreign currency,

     o    a person who has a functional currency other than the U.S. dollar,

     o    a person who  acquires our shares in  connection  with  employment  or
          other performance of services,

     o    a person subject to alternative minimum tax,

     o    a  person  who  owns  our  shares  as  part  of  a  straddle,  hedging
          transaction, constructive sale transaction, or conversion transaction,
          or

     o    except  as  specifically   described  in  the  following   summary,  a
          tax-exempt entity or a foreign person.

The  sections of the Internal  Revenue  Code that govern the federal  income tax
qualification  and treatment of a REIT and its  shareholders  are complex.  This
presentation  is a summary  of  applicable  Internal  Revenue  Code  provisions,
related rules and regulations and administrative  and judicial  interpretations,
all of which are subject to change,  possibly with  retroactive  effect.  Future
legislative,  judicial, or administrative  actions or decisions could affect the
accuracy of statements  made in this  summary.  We have not sought a ruling from
the IRS with  respect to any matter  described  in this  summary,  and we cannot
assure you that the IRS or a court will agree with the  statements  made in this
summary.  In addition,  the following  summary is not exhaustive of all possible
tax  consequences,  and does not discuss  any estate,  gift,  state,  local,  or
foreign tax consequences. For all these reasons, we urge you and any prospective
acquiror of our shares to consult  with a tax advisor  about the federal  income
tax and other tax consequences of the acquisition,  ownership and disposition of
our shares.

         Federal income tax  consequences may differ depending on whether or not
you are a "U.S.  shareholder." For purposes of this summary, a U.S.  shareholder
for federal income tax purposes is:

     o    a  citizen  or  resident  of the  United  States,  including  an alien
          individual who is a lawful permanent  resident of the United States or
          meets the substantial presence residency test under the federal income
          tax laws,

     o    a corporation, partnership or other entity treated as a corporation or
          partnership  for  federal  income  tax  purposes,  that is  created or
          organized in or under the laws of the United States, any state thereof
          or the District of  Columbia,  unless  otherwise  provided by Treasury
          regulations,

     o    an estate the income of which is  subject to federal  income  taxation
          regardless of its source, or

     o    a trust  if a court  within  the  United  States  is able to  exercise
          primary  supervision over the  administration  of the trust and one or
          more  United  States   persons  have  the  authority  to  control  all
          substantial decisions of the trust, or electing trusts in existence on
          August 20, 1996 to the extent provided in Treasury regulations,

whose  status as a U.S.  shareholder  is not  overridden  by an  applicable  tax
treaty. Conversely, a "non-U.S. shareholder" is a beneficial owner of our shares
who is not a U.S. shareholder.

                                       13


Taxation as a REIT

         We will elect to be taxed as a REIT under  Sections  856 through 860 of
the  Internal  Revenue Code  commencing  with our 1999  taxable  year.  Our 1999
taxable year began when we ceased to be wholly-owned by HRPT in October 1999 and
ended on December 31, 1999. Our REIT election,  assuming  continuing  compliance
with the federal income tax qualification  tests summarized below,  continues in
effect for  subsequent  taxable  years.  Although no assurance can be given,  we
believe that we are organized,  have operated, and will continue to operate in a
manner that qualifies us to be taxed under the Internal Revenue Code as a REIT.

         As a REIT,  we generally  will not be subject to federal  income tax on
our net income  distributed as dividends to our  shareholders.  Distributions to
our  shareholders  generally  will be includable in their income as dividends to
the extent of our current or  accumulated  earnings  and  profits.  A portion of
these dividends may be treated as capital gain dividends, as explained below. No
portion of any dividends will be eligible for the dividends  received  deduction
for corporate  shareholders.  Distributions  in excess of current or accumulated
earnings and profits  generally  will be treated for federal income tax purposes
as a return of capital to the extent of a recipient  shareholder's  basis in our
shares,  and will reduce this basis.  Our current or  accumulated  earnings  and
profits will generally be allocated  first to  distributions  on our outstanding
preferred shares, if any, and thereafter to distributions on our common shares.

         Our  counsel,  Sullivan & Worcester  LLP,  has opined that we have been
organized and have  qualified as a REIT under the Internal  Revenue Code for our
1999 taxable year, and that our current  investments  and plan of operation will
enable us to meet the  requirements  for  qualification  and  taxation as a REIT
under the Internal Revenue Code. Our actual qualification and taxation as a REIT
will  depend  upon our  ability to meet the  various  REIT  qualification  tests
imposed under the Internal Revenue Code and summarized  below.  While we believe
that we will  operate  in a manner to satisfy  the  various  REIT  qualification
tests,  our counsel has not reviewed and will not review  compliance  with these
tests on a  continuing  basis.  If we fail to qualify as a REIT in any year,  we
will be subject to federal income taxation as if we were a domestic corporation,
and our shareholders will be taxed like  shareholders of ordinary  corporations.
In this  event,  we could be subject to  significant  tax  liabilities,  and the
amount of cash available for  distribution to our shareholders may be reduced or
eliminated.

         If we qualify for  taxation as a REIT and meet the annual  distribution
tests  described  below,  we generally will not be subject to federal  corporate
income taxes on the amount distributed.  However, even if we qualify for federal
income  taxation as a REIT,  we may be subject to federal  tax in the  following
circumstances:

     o    We will be taxed at regular corporate rates on any undistributed "real
          estate  investment trust taxable income,"  including our undistributed
          net capital gains.

     o    If our alternative  minimum taxable income exceeds our taxable income,
          we may be  subject to the  corporate  alternative  minimum  tax on our
          items of tax preference.

     o    If  we  have  net  income  from  the  sale  or  other  disposition  of
          "foreclosure property" that is held primarily for sale to customers in
          the  ordinary  course of business or other  nonqualifying  income from
          foreclosure  property,  we will be  subject  to tax on this net income
          from foreclosure property at the highest regular corporate rate, which
          is  currently  35%.  REITs may elect to operate  foreclosure  property
          which is, in general, property acquired or reduced to possession after
          a default or imminent  default on a loan secured by the property or on
          a lease of the property. We anticipate operating several facilities as
          foreclosure  property in the manner prescribed by applicable  Internal
          Revenue Code provisions.

     o    If we have net income from prohibited transactions, including sales or
          other dispositions of inventory or property held primarily for sale to
          customers in the ordinary  course of business  other than  foreclosure
          property, we will be subject to tax on this income at a 100% rate.

                                       14


     o    If we fail to  satisfy  the 75%  gross  income  test or the 95%  gross
          income  test   discussed   below,   but   nonetheless   maintain   our
          qualification  as a REIT,  we will be subject to tax at a 100% rate on
          the  greater  of the  amount by which we fail the 75% or the 95% test,
          multiplied by a fraction intended to reflect our profitability.

     o    If we fail to distribute for any calendar year at least the sum of 85%
          of our REIT  ordinary  income for that year,  95% of our REIT  capital
          gain net income for that year,  and any  undistributed  taxable income
          from  prior  periods,  we will be  subject  to a 4% excise  tax on the
          excess  of  the  required   distribution  over  the  amounts  actually
          distributed.

     o    If we acquire an asset from a corporation  in a  transaction  in which
          our basis in the asset is  determined by reference to the basis of the
          asset in the hands of a present  or  former C  corporation,  and if we
          subsequently  recognize  gain on the  disposition of this asset during
          the ten-year period beginning on the date on which the asset ceased to
          be owned  by the C  corporation,  then we will pay tax at the  highest
          regular  corporate tax rate,  which is currently 35%, on the lesser of
          the  excess  of  the  fair  market  value  of  the  asset  over  the C
          corporation's  basis in the asset on the date the  asset  ceased to be
          owned by the C corporation, or the gain recognized in the disposition.

         If we invest in properties in foreign countries, our profits from those
investments  will  generally  be subject  to tax in the  countries  where  those
properties  are located.  The nature and amount of this  taxation will depend on
the laws of the countries where the properties are located.  If we operate as we
currently intend, then we will distribute our taxable income to our shareholders
and we will not pay federal income tax, and thus we generally cannot recover the
cost of foreign taxes imposed on our foreign investments by claiming foreign tax
credits  against our federal income tax liability.  Also, we cannot pass through
to our shareholders any foreign tax credits.

         If we fail to qualify  for  federal  income  taxation  as a REIT in any
taxable  year,  then we will be subject to federal  tax in the same manner as an
ordinary corporation.  Distributions to our shareholders in any year in which we
fail to qualify as a REIT will not be deductible,  nor will these  distributions
be  required  to be made.  In that  event,  to the  extent  of our  current  and
accumulated  earnings and profits, all distributions to our shareholders will be
taxable as ordinary  dividend income and, subject to limitations in the Internal
Revenue  Code,  will  be  eligible  for the  dividends  received  deduction  for
corporate recipients. Also in that event, we will generally be disqualified from
federal  income  taxation  as a  REIT  for  the  four  taxable  years  following
disqualification.  Failure to qualify for federal income  taxation as a REIT for
even  one  year  could  result  in our  incurring  substantial  indebtedness  or
liquidating   substantial   investments   in   order   to  pay   the   resulting
corporate-level taxes.

REIT Qualification Requirements

         General  Requirements.  Section  856(a) of the  Internal  Revenue  Code
defines a REIT as a corporation, trust or association:

         (1) that is managed by one or more trustees or directors;

         (2) the  beneficial  ownership of which is  evidenced  by  transferable
shares or by transferable certificates of beneficial interest;

         (3) that would be  taxable,  but for  Sections  856  through 859 of the
Internal Revenue Code, as an ordinary domestic corporation;

         (4) that is not a financial institution or an insurance company subject
to special provisions of the Internal Revenue Code;

         (5) the beneficial ownership of which is held by 100 or more persons;

                                       15


         (6) that is not "closely  held" as defined  under the personal  holding
company stock ownership test, as described below; and

         (7) that meets other tests regarding income,  assets and distributions,
all as described below.

Section 856(b) of the Internal Revenue Code provides that conditions (1) to (4),
inclusive,  must be met during the entire  taxable year and that  condition  (5)
must be met during at least 335 days of a taxable year of 12 months, or during a
pro rata part of a taxable year of less than 12 months. Section 856(h)(2) of the
Internal  Revenue Code provides that  conditions (5) and (6) need not be met for
our first taxable year as a REIT. We believe that we have  satisfied  conditions
(1) to (6), inclusive,  during each of the requisite periods ending on or before
December 31, 1999,  and that we will  continue to satisfy  those  conditions  in
future taxable years. There can, however, be no assurance in this regard.

         By reason of condition (6) above, we will fail to qualify as a REIT for
a taxable  year if at any time during the last half of the year more than 50% in
value of our outstanding shares is owned directly or indirectly by five or fewer
individuals.  To help  comply  with  condition  (6),  our  declaration  of trust
contains  provisions  restricting  transfers of our shares.  In addition,  if we
comply with applicable  Treasury  regulations for  ascertaining the ownership of
our outstanding  shares and do not know, or by exercising  reasonable  diligence
would not have known,  that we failed  condition (6), then we will be treated as
satisfying  condition  (6).  Also,  our failure to comply with these  applicable
Treasury  regulations for ascertaining  ownership of our outstanding  shares may
result  in  a  penalty  of  $25,000,  or  $50,000  for  intentional  violations.
Accordingly, we intend to comply with these Treasury regulations, and to request
annually  from  record  holders  of   significant   percentages  of  our  shares
information  regarding the  ownership of our shares.  Under our  declaration  of
trust,   our  shareholders  are  required  to  respond  to  these  requests  for
information.

         For purposes of condition (6) above, shares in a REIT held by a pension
trust are  treated as held  directly  by the pension  trust's  beneficiaries  in
proportion to their actuarial interests in the pension trust. Consequently, five
or fewer  pension  trusts could own more than 50% of the  interests in an entity
without  jeopardizing  that entity's federal income tax qualification as a REIT.
However,  as discussed  below, if a REIT is a "pension-held  REIT," each pension
trust owning more than 10% of the REIT's shares by value generally will be taxed
on a portion of the dividends received from the REIT, based on the ratio of:

         (1) the REIT's gross income for the year that would be unrelated  trade
or business income if the REIT were a qualified pension trust, to

         (2) the REIT's total gross income for the year.

         Our Wholly-Owned Subsidiaries and Our Investments through Partnerships.
Section 856(i) of the Internal  Revenue Code provides that any corporation  100%
of whose stock is held by a REIT is a qualified REIT subsidiary and shall not be
treated as a separate corporation.  The assets, liabilities and items of income,
deduction and credit of a qualified  REIT  subsidiary are treated as the REIT's.
We believe that each of our direct and indirect  wholly-owned  subsidiaries will
either be a qualified  REIT  subsidiary  within the meaning of Section 856(i) of
the Internal Revenue Code, or a noncorporate  entity that for federal income tax
purposes  is not treated as separate  from its owner  under  regulations  issued
under  Section  7701 of the Internal  Revenue  Code.  Thus,  in applying all the
federal income tax REIT  qualification  requirements  described in this summary,
all assets,  liabilities and items of income, deduction and credit of our direct
and indirect wholly-owned subsidiaries are treated as ours.

         We may invest in real  estate  through  one or more  limited or general
partnerships or limited liability companies that are treated as partnerships for
federal  income  tax  purposes.  In the case of a REIT  that is a  partner  in a
partnership,  regulations  under the Internal  Revenue Code  provide  that,  for
purposes  of the REIT  qualification  requirements  regarding  income and assets
discussed below, the REIT is deemed to own its proportionate share of the assets
of the partnership corresponding to the REIT's proportionate capital interest in

                                       16


the  partnership  and is deemed to be entitled to the income of the  partnership
attributable to this proportionate share. In addition,  for these purposes,  the
character of the assets and gross income of the partnership generally retain the
same character in the hands of the REIT. Accordingly, our proportionate share of
the assets, liabilities, and items of income of each partnership in which we are
a partner is treated as ours for  purposes  of the income  tests and asset tests
discussed  below.  In  contrast,  for purposes of the  distribution  requirement
discussed below, we must take into account as a partner our  distributive  share
of the  partnership's  income as determined under the general federal income tax
rules governing  partners and partnerships under Sections 701 through 777 of the
Internal Revenue Code.

         Income Tests. There are two gross income requirements for qualification
as a REIT under the Internal Revenue Code:

     o    At least 75% of our gross income, excluding gross income from sales or
          other  dispositions  of  property  held  primarily  for sale,  must be
          derived from investments  relating to real property,  including "rents
          from real  property"  as defined  under  Section  856 of the  Internal
          Revenue Code,  mortgages on real  property,  or shares in other REITs.
          When we receive new capital in exchange  for our shares or in a public
          offering of five-year or longer debt instruments,  income attributable
          to the  temporary  investment  of this new  capital in stock or a debt
          instrument,  if received or accrued  within one year of our receipt of
          the new capital,  is generally  also  qualifying  income under the 75%
          test.

     o    At least 95% of our gross income, excluding gross income from sales or
          other  dispositions  of  property  held  primarily  for sale,  must be
          derived  from a  combination  of items of real  property  income  that
          satisfy the 75% test described above,  dividends,  interest,  payments
          under  interest  rate  swap  or  cap  agreements,   options,   futures
          contracts,  forward rate agreements, or similar financial instruments,
          and gains from the sale or disposition of stock,  securities,  or real
          property.

For  purposes  of  these  two  requirements,   income  derived  from  a  "shared
appreciation  provision"  in a  mortgage  loan  is  generally  treated  as  gain
recognized on the sale of the property to which it relates. Although we will use
our best efforts to ensure that the income  generated by our investments will be
of a type which satisfies both the 75% and 95% gross income tests,  there can be
no assurance in this regard.

         In order to qualify as "rents from real property"  under Section 856 of
the Internal Revenue Code, several requirements must be met:

     o    The amount of rent received  generally must not be based on the income
          or profits of any person, but may be based on receipts or sales.

     o    Rents do not  qualify if the REIT owns 10% or more by vote or value of
          the tenant,  whether  directly  or after  application  of  attribution
          rules.  While we intend  not to lease  property  to any party if rents
          from that  property  would not  qualify as rents  from real  property,
          application  of the 10%  ownership  rule  is  dependent  upon  complex
          attribution  rules and  circumstances  that may be beyond our control.
          For example,  an unaffiliated  third party's ownership  directly or by
          attribution  of 10% or more by value of our shares,  or 10% or more by
          value of HRPT Properties Trust's shares for so long as HRPT Properties
          Trust  owns 10% or more by value of us, as well as 10% or more by vote
          or value of the  stock of one of our  lessees,  would  result  in that
          lessee's  rents  not  qualifying  as rents  from  real  property.  Our
          declaration of trust  disallows  transfers or purported  acquisitions,
          directly  or by  attribution,  of our  shares  that  could  result  in
          disqualification as a REIT under the Internal Revenue Code and permits
          our  trustees  to  repurchase  the shares to the extent  necessary  to
          maintain  our  status  as a REIT  under  the  Internal  Revenue  Code.
          Nevertheless,  there can be no assurance that these  provisions in our
          declaration  of trust will be  effective  to prevent REIT status under
          the Internal Revenue Code from being  jeopardized under the 10% lessee
          affiliate rule. Furthermore, there can be no assurance that we will be
          able  to  monitor  and  enforce  these  restrictions,   nor  will  our

                                       17


          shareholders necessarily be aware of ownership of shares attributed to
          them under the Internal Revenue Code's attribution rules.

     o    In order  for rents to  qualify,  we  generally  must not  manage  the
          property or furnish or render services to the tenants of the property,
          except  through  an  independent  contractor  from  whom we  derive no
          income.  There  is an  exception  to this  rule  permitting  a REIT to
          perform  customary  tenant  services  of the sort  which a  tax-exempt
          organization  could  perform  without  being  considered in receipt of
          "unrelated business taxable income" as defined in Section 512(b)(3) of
          the  Internal  Revenue  Code.  In  addition,  a de  minimis  amount of
          noncustomary  services will not disqualify  income as "rents from real
          property" so long as the value of the impermissible  services does not
          exceed 1% of the gross income from the property.

     o    If rent  attributable to personal property leased in connection with a
          lease of real property is 15% or less of the total rent received under
          the  lease,  then the rent  attributable  to  personal  property  will
          qualify  as  rents  from  real  property;  if this  15%  threshold  is
          exceeded,  the rent  attributable  to  personal  property  will not so
          qualify.  The  portion of rental  income  treated as  attributable  to
          personal  property  is  determined  according  to the ratio of the tax
          basis of the personal  property to the total tax basis of the real and
          personal  property which is rented.  For taxable years after 2000, the
          ratio will be  determined  by reference to fair market  values  rather
          than tax bases.

We  believe  that all or  substantially  all our rents have  qualified  and will
qualify as rents from real  property for purposes of Section 856 of the Internal
Revenue Code.

         In order to qualify as mortgage  interest on real property for purposes
of the 75% test,  interest  must  derive  from a mortgage  loan  secured by real
property with a fair market value,  at the time the loan is made, at least equal
to the amount of the loan.  If the amount of the loan  exceeds  the fair  market
value of the real  property,  the  interest  will be  treated as  interest  on a
mortgage loan in a ratio equal to the ratio of the fair market value of the real
property to the total amount of the mortgage loan.

         Other than sales of  foreclosure  property,  any gain we realize on the
sale of property held as inventory or other  property held primarily for sale to
customers  in the ordinary  course of business  will be treated as income from a
prohibited  transaction  that is subject to a penalty  tax at a 100% rate.  This
prohibited  transaction  income also may have an adverse effect upon our ability
to  satisfy  the  75%  and  95%  gross  income  tests  for  federal  income  tax
qualification  as a REIT. We cannot provide  assurances as to whether or not the
IRS might successfully assert that one or more of our dispositions is subject to
the 100% penalty tax.  However,  we believe that  dispositions of assets that we
might make will not be subject to the 100% penalty tax, because we intend to:

     o    own  our  assets  for  investment  with a  view  to  long-term  income
          production and capital appreciation;

     o    engage  in the  business  of  developing,  owning  and  operating  our
          existing  properties and acquiring,  developing,  owning and operating
          new properties; and

     o    make  occasional  dispositions  of  our  assets  consistent  with  our
          long-term investment objectives.

         If we fail to satisfy one or both of the 75% or 95% gross  income tests
for any taxable year, we may nevertheless qualify as a REIT for that year if:

     o    our failure to meet the test was due to  reasonable  cause and not due
          to willful neglect;

     o    we report the nature and amount of each item of our income included in
          the 75% or 95% gross  income tests for that taxable year on a schedule
          attached to our tax return; and

     o    any  incorrect  information  on the schedule was not due to fraud with
          intent to evade tax.

                                       18


It is impossible to state whether in all  circumstances  we would be entitled to
the benefit of this relief  provision  for the 75% and 95% gross  income  tests.
Even if this relief  provision did apply, a special tax equal to 100% is imposed
upon the  greater of the amount by which we failed the 75% test or the 95% test,
multiplied by a fraction intended to reflect our profitability.

         Asset Tests. At the close of each quarter of each taxable year, we must
also satisfy three percentage tests relating to the nature of our assets:

     o    At least 75% of our total assets must  consist of real estate  assets,
          cash and cash items, shares in other REITs, government securities, and
          stock or debt instruments  purchased with proceeds of a stock offering
          or an  offering  of our debt with a term of at least five  years,  but
          only  for the  one-year  period  commencing  with our  receipt  of the
          offering proceeds.

     o    Not more than 25% of our total assets may be represented by securities
          other than those  securities that count favorably toward the preceding
          75% asset test.

     o    Of the  investments  included in the  preceding  25% asset class,  the
          value of any one issuer's  securities that we own may not exceed 5% of
          the value of our total assets, and we may not own more than 10% of any
          one non-REIT issuer's outstanding voting securities. For taxable years
          after  2000,  we may not own more than 10% of the vote or value of any
          one non-REIT issuer's  outstanding  securities,  unless that issuer is
          our taxable  REIT  subsidiary  or the  securities  are  straight  debt
          securities.

When a failure to satisfy the above asset tests results from an  acquisition  of
securities  or other  property  during a quarter,  the  failure  can be cured by
disposition of sufficient nonqualifying assets within 30 days after the close of
that  quarter.  We  intend to  maintain  records  of the value of our  assets to
document our compliance with the above three asset tests, and to take actions as
may be required  to cure any  failure to satisfy the tests  within 30 days after
the close of any quarter.

         Annual Distribution Requirements. In order to qualify for taxation as a
REIT  under  the  Internal   Revenue  Code,  we  are  required  to  make  annual
distributions other than capital gain dividends to our shareholders in an amount
at least equal to the excess of:

         (A)  the  sum of  95% of our  "real  estate  investment  trust  taxable
income," as defined in Section 857 of the  Internal  Revenue  Code,  computed by
excluding any net capital gain and before taking into account any dividends paid
deduction  for which we are  eligible,  and 95% of our net income  after tax, if
any, from property received in foreclosure, over

         (B) the sum of our  qualifying  noncash  income,  e.g.,  imputed rental
income or income from transactions inadvertently failing to qualify as like-kind
exchanges.

For our taxable years after 2000, the preceding 95%  percentages  are reduced to
90%. The distributions must be paid in the taxable year to which they relate, or
in the following  taxable year if declared  before we timely file our tax return
for the  earlier  taxable  year  and if  paid on or  before  the  first  regular
distribution  payment  after that  declaration.  Dividends  declared in October,
November,  or December and paid during the following  January will be treated as
having been both paid and received on December 31 of the prior  taxable  year. A
distribution  which is not pro rata within a class of our  beneficial  interests
entitled  to a  distribution,  or which is not  consistent  with the  rights  to
distributions  among our  classes of  beneficial  interests,  is a  preferential
distribution  that  is  not  taken  into   consideration  for  purposes  of  the
distribution  requirements,  and  accordingly  the  payment  of  a  preferential
distribution  could  affect our ability to meet the  distribution  requirements.
Taking  into  account  our   distribution   policies,   including  the  dividend
reinvestment  plan  we have  adopted,  we  expect  that we  will  not  make  any
preferential  distributions.  The distribution requirements may be waived by the
IRS if a REIT establishes that it failed to meet them by reason of distributions
previously made to meet the  requirements of the

                                       19


4% excise tax discussed  below.  To the extent that we do not  distribute all of
our net capital gain and all of our real estate investment trust taxable income,
as adjusted, we will be subject to tax on undistributed amounts.

         In  addition,  we will be  subject  to a 4% excise tax to the extent we
fail within a calendar year to make required  distributions  to our shareholders
of 85% of our  ordinary  income and 95% of our capital  gain net income plus the
excess,  if any, of the  "grossed up required  distribution"  for the  preceding
calendar year over the amount treated as distributed for that preceding calendar
year.  For this  purpose,  the term "grossed up required  distribution"  for any
calendar  year is the sum of our taxable  income for the  calendar  year without
regard to the deduction  for  dividends  paid and all amounts from earlier years
that are not treated as having been distributed under the provision.

         If we do not have  enough cash or other  liquid  assets to meet the 95%
distribution  requirements,  we may find it necessary to arrange for new debt or
equity financing to provide funds for required  distributions,  or else our REIT
status for federal income tax purposes could be  jeopardized.  We can provide no
assurance  that  financing  would be available  for these  purposes on favorable
terms.

         If we fail to distribute  sufficient  dividends for any year, we may be
able to rectify this failure by paying "deficiency dividends" to shareholders in
a later year.  These  deficiency  dividends may be included in our deduction for
dividends  paid for the earlier  year,  but an interest  charge would be imposed
upon us for the delay in  distribution.  Although  we may be able to avoid being
taxed on amounts distributed as deficiency dividends,  we will remain liable for
the 4% excise tax discussed above.

         Recent Federal Taxation  Changes.  The Tax Relief Extension Act of 1999
was enacted late in 1999 and is  effective  for taxable  years after 2000.  This
legislation  contained  several  tax  provisions  regarding  REITs,  including a
reduction  of the annual  distribution  requirement  for real estate  investment
trust taxable income from 95% to 90%, as mentioned  above.  The Act also changed
the 10% voting  securities  test under  current law to a 10% vote or value test.
Thus,  subject to exceptions,  a REIT will no longer be allowed to own more that
10% by vote or value of the outstanding  securities of any issuer,  other than a
qualified REIT subsidiary or another REIT.  Another  exception to this new test,
which is also an exception to the 5% asset test under current law, allows a REIT
to own any or all of the  securities of an electing  "taxable REIT  subsidiary,"
provided that no more than 20% of the REIT's assets is  represented by the stock
or  securities  of taxable  REIT  subsidiaries.  A taxable REIT  subsidiary  can
perform noncustomary  services for tenants of a REIT without disqualifying rents
received  from the tenants for purposes of the REIT's gross income tests and can
also undertake third-party  management and development activities and activities
that are not related to real estate.  A taxable REIT subsidiary  cannot directly
or  indirectly  operate  or  manage a  health  care  facility.  A  taxable  REIT
subsidiary  will be taxed as a subchapter C  corporation  but will be subject to
earnings  stripping  limitations  on the  deductibility  of interest paid to the
REIT. In addition, a REIT will be subject to a 100% excise tax on certain excess
amounts to ensure that:

     o    tenants who pay a taxable REIT  subsidiary for services are charged an
          arm's length amount by the taxable REIT subsidiary for these services;

     o    shared  expenses  of a  REIT  and  its  taxable  REIT  subsidiary  are
          allocated fairly between the two; and

     o    interest paid by a taxable REIT subsidiary to the REIT that owns it is
          commercially reasonable.

         In connection with foreclosure  actions, we anticipate operating health
care properties  through  taxable  subsidiaries in which we own less than 10% of
the vote but most of the value, all in accordance with current laws. For taxable
years after 2000, we will  restructure our affairs as appropriate to comply with
the requirements of applicable law.

                                       20


Depreciation and Federal Income Tax Treatment of Leases

         Our initial tax bases in our assets will  generally be our  acquisition
cost. We will generally  depreciate our real property on a  straight-line  basis
over 40 years  and our  personal  property  over 12  years.  These  depreciation
schedules may vary for properties that we acquire through  tax-free or carryover
basis acquisitions.

         The initial tax bases and depreciation schedules for our assets we held
immediately  after we ceased to be wholly-owned by HRPT Properties Trust depends
upon whether the deemed exchange that resulted from the spin-off was an exchange
under  Section  351(a) of the  Internal  Revenue  Code.  We believe that Section
351(a)  treatment was appropriate,  and we carried over HRPT Properties  Trust's
tax basis and  depreciation  schedule in each of the  assets,  and to the extent
that HRPT Properties  Trust  recognized gain on an asset in the deemed exchange,
we have  additional  tax basis in that  asset  which we  depreciate  in the same
manner as we depreciate newly purchased assets.  In contrast,  if Section 351(a)
treatment was not appropriate for the deemed  exchange,  then we will be treated
as though we  acquired  all our  assets at the time of the  spin-off  in a fully
taxable acquisition, thereby acquiring aggregate tax bases in these assets equal
to the  aggregate  amount  realized  by  HRPT  Properties  Trust  in the  deemed
exchange,  and we will  depreciate  these  tax  bases in the same  manner  as we
depreciate newly purchased assets. We believe,  and Sullivan & Worcester LLP has
opined, that it is likely that the deemed exchange was an exchange under Section
351(a),  and we  will  perform  all  our tax  reporting  accordingly.  We may be
required to amend these tax reports,  including those sent to our  shareholders,
if the IRS  successfully  challenges our position that the deemed exchange is an
exchange  under  Section  351(a).  We  intend  to comply  with the  annual  REIT
distribution  requirements  regardless  of whether  the deemed  exchange  was an
exchange under Section 351(a).

         We will be entitled to depreciation deductions from our facilities only
if we  are  treated  for  federal  income  tax  purposes  as  the  owner  of the
facilities.  This means that the leases of the facilities must be classified for
federal  income tax purposes as true  leases,  rather than as sales or financing
arrangements,  and we believe this to be the case. In the case of sale-leaseback
arrangements, the IRS could assert that we realized prepaid rental income in the
year of purchase to the extent that the value of a leased property,  at the time
of purchase,  exceeded the purchase  price for that  property.  While we believe
that the  value  of  leased  property  at the time of  purchase  did not  exceed
purchase  prices,  because  of the lack of clear  precedent  we  cannot  provide
assurances  as to whether the IRS might  successfully  assert the  existence  of
prepaid rental income in any of our sale-leaseback transactions.

         Additionally,  Section 467 of the Internal Revenue Code, which concerns
leases with increasing rents, may apply to those of our leases which provide for
rents that  increase  from one period to the next.  Section 467 of the  Internal
Revenue Code  provides that in the case of a so-called  "disqualified  leaseback
agreement" rental income must be accrued at a constant rate. Where constant rent
accrual is required,  we could recognize rental income from a lease in excess of
cash  rents  and,  as a result,  encounter  difficulty  in  meeting  the  annual
distribution  requirement.  Disqualified  leaseback agreements include leaseback
transactions  where a principal purpose for providing  increasing rent under the
agreement  is the  avoidance of federal  income tax.  Recently  issued  Treasury
regulations  provide  that  rents  will not be  treated  as  increasing  for tax
avoidance  purposes  where the  increases  are based upon a fixed  percentage of
lessee  receipts.  Therefore,  the additional rent provisions in our leases that
are based on a fixed  percentage of lessee receipts  generally  should not cause
the leases to be disqualified leaseback agreements under Section 467.

Taxation of U.S. Shareholders

         As long as we qualify as a REIT for  federal  income  tax  purposes,  a
distribution to our U.S. shareholders that we do not designate as a capital gain
dividend will be treated as an ordinary income dividend to the extent that it is
made out of current or accumulated earnings and profits.  Distributions made out
of our current or accumulated earnings and profits that we properly designate as
capital gain  dividends will be taxed as long-term  capital gains,  as discussed
below,  to the extent  they do not exceed  our actual net  capital  gain for the
taxable

                                       21


year. However,  corporate shareholders may be required to treat up to 20% of any
capital  gain  dividend as ordinary  income  under  Section 291 of the  Internal
Revenue Code.

         In  addition,  we may elect to retain net capital gain income and treat
it as constructively distributed. In that case:

         (1) we will be taxed at regular  corporate  capital  gains tax rates on
retained amounts,

         (2) each U.S. shareholder will be taxed on its designated proportionate
share of our retained net capital  gains as though that amount were  distributed
and designated a capital gain dividend,

         (3) each U.S.  shareholder  will  receive a credit  for its  designated
proportionate share of the tax that we pay,

         (4) each U.S.  shareholder  will  increase  its  adjusted  basis in our
shares by the excess of the amount of its proportionate  share of these retained
net capital gains over its proportionate share of this tax that we pay, and

         (5)  both we and our  corporate  shareholders  will  make  commensurate
adjustments  in our  respective  earnings  and profits  for  federal  income tax
purposes.

If we elect to retain our net capital gains in this fashion,  we will notify our
U.S. shareholders of the relevant tax information within 60 days after the close
of the affected taxable year.

         For  noncorporate  U.S.  shareholders,   long-term  capital  gains  are
generally  taxed  at  maximum  rates of 20% or 25%,  depending  upon the type of
property  disposed of and the previously  claimed  depreciation  with respect to
this  property.  If for any taxable year we designate as capital gain  dividends
any portion of the  dividends  paid or made  available  for the year to our U.S.
shareholders,  including  our  retained  capital  gains  treated as capital gain
dividends,  then the portion of the capital gain  dividends so  designated  that
will be  allocated  to the  holders of a  particular  class of shares  will on a
percentage  basis equal the ratio of the amount of the total  dividends  paid or
made  available for the year to the holders of that class of shares to the total
dividends  paid or made  available for the year to holders of all classes of our
shares.  We will  similarly  designate  the portion of any capital gain dividend
that is to be taxed to  noncorporate  U.S.  shareholders at the maximum rates of
20% or 25% so that the  designations  will be proportional  among all classes of
our shares.

         Distributions in excess of current or accumulated  earnings and profits
will not be taxable to a U.S.  shareholder to the extent that they do not exceed
the shareholder's  adjusted basis in the shareholder's  shares,  but will reduce
the  shareholder's  basis in those  shares.  To the  extent  that  these  excess
distributions  exceed the adjusted basis of a U.S.  shareholder's  shares,  they
will be included in income as capital gain,  with long-term gain generally taxed
to noncorporate U.S.  shareholders at a maximum rate of 20%. No U.S. shareholder
may include on his federal income tax return any of our net operating  losses or
any of our capital losses.

         Dividends that we declare in October, November or December of a taxable
year to U.S.  shareholders of record on a date in those months will be deemed to
have been received by shareholders on December 31 of that taxable year, provided
we actually pay these dividends during the following  January.  Also, items that
are treated  differently for regular and alternative minimum tax purposes are to
be allocated  between a REIT and its  shareholders  under  Treasury  regulations
which are to be prescribed.  It is possible that these Treasury regulations will
require tax preference items to be allocated to our shareholders with respect to
any accelerated depreciation or other tax preference items that we claim.

         A U.S.  shareholder's  sale or  exchange  of our shares  will result in
recognition  of gain or loss in an amount  equal to the  difference  between the
amount  realized  and the  shareholder's  adjusted  basis in the shares  sold or
exchanged. This gain or loss will be capital gain or loss, and will be long-term
capital gain or loss if the

                                       22


shareholder's  holding period in the shares  exceeds one year. In addition,  any
loss upon a sale or  exchange  of our  shares  held for six  months or less will
generally be treated as a long-term  capital loss to the extent of our long-term
capital gain dividends during the holding period.

         Noncorporate  U.S.  shareholders  who  borrow  funds to  finance  their
acquisition  of our shares could be limited in the amount of deductions  allowed
for the interest paid on the indebtedness incurred.  Under Section 163(d) of the
Internal  Revenue  Code,  interest paid or accrued on  indebtedness  incurred or
continued  to  purchase  or carry  property  held for  investment  is  generally
deductible  only to the extent of the investor's net investment  income.  A U.S.
shareholder's  net  investment  income will  include  ordinary  income  dividend
distributions  received from us and, if an  appropriate  election is made by the
shareholder,  capital gain dividend  distributions  received  from us;  however,
distributions treated as a nontaxable return of the shareholder's basis will not
enter into the computation of net investment income.

Taxation of Tax-Exempt Shareholders

         In Revenue Ruling 66-106,  the IRS ruled that amounts  distributed by a
REIT to a tax-exempt  employees'  pension  trust did not  constitute  "unrelated
business  taxable  income,"  even  though  the REIT may have  financed  some its
activities  with   acquisition   indebtedness.   Although  revenue  rulings  are
interpretive  in nature and subject to  revocation or  modification  by the IRS,
based  upon  the  analysis  and  conclusion  of  Revenue   Ruling  66-106,   our
distributions made to shareholders that are tax-exempt pension plans, individual
retirement  accounts,   or  other  qualifying  tax-exempt  entities  should  not
constitute  unrelated  business  taxable  income,  unless  the  shareholder  has
financed its acquisition of our shares with  "acquisition  indebtedness"  within
the meaning of the Internal Revenue Code.

         Special rules apply to tax-exempt pension trusts,  including  so-called
401(k) plans but excluding individual  retirement accounts or government pension
plans,  that own more  than  10% by value of a  "pension-held  REIT" at any time
during a taxable  year.  The pension trust may be required to treat a percentage
of all  dividends  received  from  the  pension-held  REIT  during  the  year as
unrelated business taxable income. This percentage is equal to the ratio of:

         (1) the  pension-held  REIT's gross income  derived from the conduct of
unrelated trades or businesses,  determined as if the  pension-held  REIT were a
tax-exempt pension fund, less direct expenses related to that income, to

         (2) the pension-held REIT's gross income from all sources,  less direct
expenses related to that income,

except that this percentage shall be deemed to be zero unless it would otherwise
equal or exceed 5%. A REIT is a pension-held REIT if:

     o    the REIT is "predominantly held" by tax-exempt pension trusts, and

     o    the REIT would  otherwise fail to satisfy the "closely held" ownership
          requirement  discussed  above if the stock or beneficial  interests in
          the REIT held by  tax-exempt  pension  trusts  were  viewed as held by
          tax-exempt   pension   trusts   rather   than  by   their   respective
          beneficiaries.

A REIT is  predominantly  held by  tax-exempt  pension  trusts  if at least  one
tax-exempt  pension  trust  owns more than 25% by value of the  REIT's  stock or
beneficial  interests,  or if one or more tax-exempt pension trusts, each owning
more than 10% by value of the REIT's stock or beneficial  interests,  own in the
aggregate  more than 50% by value of the REIT's stock or  beneficial  interests.
Because of the  restrictions in our declaration of trust regarding the ownership
concentration  of our  shares,  we  believe  that we are not and  will  not be a
pension-held  REIT.  However,  because our shares are publicly traded, we cannot
completely control whether or not we are or will become a pension-held REIT.

                                       23


Taxation of Non-U.S. Shareholders

         The rules  governing  the United  States  federal  income  taxation  of
non-U.S. shareholders are complex, and the following discussion is intended only
as a summary of these rules. If you are a non-U.S.  shareholder,  we urge you to
consult  with your own tax  advisor to  determine  the  impact of United  States
federal, state, local, and foreign tax laws, including any tax return filing and
other reporting requirements, with respect to your investment in our shares.

         In general,  a non-U.S.  shareholder  will be subject to regular United
States federal income tax in the same manner as a U.S.  shareholder with respect
to its investment in our shares if that investment is effectively connected with
the non-U.S.  shareholder's conduct of a trade or business in the United States.
In addition, a corporate non-U.S. shareholder that receives income that is or is
deemed  effectively  connected with a trade or business in the United States may
also be subject to the 30% branch  profits tax under Section 884 of the Internal
Revenue  Code,  which is payable in addition to regular  United  States  federal
corporate  income  tax.  The  balance of this  discussion  on the United  States
federal income taxation of non-U.S.  shareholders  addresses only those non-U.S.
shareholders  whose  investment in our shares is not effectively  connected with
the conduct of a trade or business in the United States.

         A distribution by us to a non-U.S. shareholder that is not attributable
to gain from the sale or exchange of a United States real property  interest and
that is not designated as a capital gain dividend will be treated as an ordinary
income  dividend  to the extent  that it is made out of  current or  accumulated
earnings and profits.  A distribution  of this type will generally be subject to
United  States  federal  income tax and  withholding  at the rate of 30%, or the
lower rate that may be specified by a tax treaty if the non-U.S. shareholder has
in the manner  prescribed by the IRS  demonstrated  its  entitlement to benefits
under a tax treaty.  Because we cannot  determine  our  current and  accumulated
earnings and profits until the end of the taxable year,  withholding at the rate
of 30% or  applicable  lower  treaty rate will be imposed on the gross amount of
any  distribution to a non-U.S.  shareholder that we make and do not designate a
capital gain dividend.  Notwithstanding  this  withholding on  distributions  in
excess of our current and accumulated earnings and profits,  these distributions
are a  nontaxable  return of capital  to the extent  that they do not exceed the
non-U.S.  shareholder's  adjusted basis in our shares, and the nontaxable return
of capital will reduce the adjusted  basis in these  shares.  To the extent that
distributions  in excess of current and accumulated  earnings and profits exceed
the non-U.S.  shareholder's adjusted basis in our shares, the distributions will
give rise to tax  liability  if the  non-U.S.  shareholder  would  otherwise  be
subject  to tax on any gain  from  the sale or  exchange  of  these  shares,  as
discussed  below.  A  non-U.S.  shareholder  may seek a  refund  from the IRS of
amounts  withheld  on  distributions  to  him  in  excess  of  our  current  and
accumulated earnings and profits.

         For any year in  which we  qualify  as a REIT,  distributions  that are
attributable  to gain from the sale or exchange of a United States real property
interest  are taxed to a non-U.S.  shareholder  as if these  distributions  were
gains  effectively  connected  with a trade or  business  in the  United  States
conducted by the non-U.S. shareholder.  Accordingly, a non-U.S. shareholder will
be taxed on these amounts at the normal capital gain rates  applicable to a U.S.
shareholder,  subject to any applicable alternative minimum tax and to a special
alternative  minimum  tax in the  case of  nonresident  alien  individuals;  the
non-U.S. shareholder will be required to file a United States federal income tax
return  reporting  these amounts,  even if applicable  withholding is imposed as
described  below;  and corporate  non-U.S.  shareholders  may owe the 30% branch
profits tax under  Section 884 of the Internal  Revenue Code in respect of these
amounts.  We will  be  required  to  withhold  from  distributions  to  non-U.S.
shareholders,  and  remit  to  the  IRS,  35%  of  the  maximum  amount  of  any
distribution  that could be designated as a capital gain dividend.  In addition,
for purposes of this  withholding  rule, if we designate prior  distributions as
capital gain dividends,  then subsequent  distributions  up to the amount of the
designated prior  distributions  will be treated as capital gain dividends.  The
amount of any tax  withheld is  creditable  against the  non-U.S.  shareholder's
United States federal  income tax  liability,  and any amount of tax withheld in
excess of that tax liability may be refunded  provided that an appropriate claim
for  refund is filed  with the IRS.  If for any  taxable  year we  designate  as
capital gain  dividends any portion of the dividends  paid or made available for
the year to our  shareholders,  including our retained  capital gains treated as
capital  gain

                                       24


dividends,  then the portion of the capital gain  dividends so  designated  that
will be  allocated  to the  holders of a  particular  class of shares  will on a
percentage  basis equal the ratio of the amount of the total  dividends  paid or
made  available for the year to the holders of that class of shares to the total
dividends  paid or made  available for the year to holders of all classes of our
shares.

         Tax   treaties   may  reduce  the   withholding   obligations   on  our
distributions.   Under  some  treaties,   however,  rates  below  30%  generally
applicable to ordinary income dividends from United States  corporations may not
apply to ordinary income dividends from a REIT. If the amount of tax withheld by
us  with  respect  to a  distribution  to a  non-U.S.  shareholder  exceeds  the
shareholder's  United States  federal  income tax liability  with respect to the
distribution,  the non-U.S. shareholder may file for a refund of the excess from
the IRS. In this regard,  note that the 35% withholding tax rate on capital gain
dividends  corresponds  to the maximum  income tax rate  applicable to corporate
non-U.S.  shareholders  but is  higher  than  the 20% and 25%  maximum  rates on
capital  gains  generally  applicable  to  noncorporate  non-U.S.  shareholders.
Generally  effective with respect to distributions paid after December 31, 2000,
new Treasury regulations alter the information  reporting and backup withholding
rules applicable to non-U.S. shareholders and provide presumptions under which a
non-U.S.  shareholder is subject to backup withholding and information reporting
until we or the applicable  withholding  agent receives  certification  from the
shareholder  of its  non-U.S.  shareholder  status.  In  some  instances,  these
certification  requirements  are more  burdensome  than those  applicable  under
current  Treasury  regulations.  These new  Treasury  regulations  also  provide
special  rules  to  determine   whether,   for  purposes  of   determining   the
applicability of a tax treaty, our distributions to a non-U.S.  shareholder that
is an  entity  should be  treated  as paid to the  entity or to those  owning an
interest in that  entity,  and whether the entity or its owners are  entitled to
benefits under the tax treaty. These new Treasury regulations encourage non-U.S.
shareholders and withholding agents to use the new IRS Forms W-8 series,  rather
than the  predecessor  IRS Forms W-8, 1001, and 4224, and require use of the IRS
Forms W-8 series for payments made after December 31, 2000.

         If our shares are not "United  States real property  interests"  within
the  meaning  of  Section  897  of  the  Internal   Revenue   Code,  a  non-U.S.
shareholder's  gain on sale of these  shares  generally  will not be  subject to
United  States  federal  income  taxation,   except  that  a  nonresident  alien
individual  who was present in the United States for 183 days or more during the
taxable  year will be  subject to a 30% tax on this  gain.  Our shares  will not
constitute  a United  States real  property  interest if we are a  "domestically
controlled REIT." A domestically controlled REIT is a REIT in which at all times
during the  preceding  five-year  period less than 50% in value of its shares is
held directly or indirectly by foreign persons.  We believe that we are and will
be a domestically controlled REIT and thus a non-U.S. shareholder's gain on sale
of our shares  will not be subject to United  States  federal  income  taxation.
However,  because our shares are  publicly  traded,  we can provide no assurance
that we will be a  domestically  controlled  REIT. If we are not a  domestically
controlled REIT, a non-U.S. shareholder's gain on sale of our shares will not be
subject to United States  federal  income  taxation as a sale of a United States
real  property  interest,  if that  class of shares is  "regularly  traded,"  as
defined by applicable Treasury regulations,  on an established securities market
like the New York Stock Exchange, and the non-U.S.  shareholder has at all times
during  the  preceding  five  years  owned 5% or less by value of that  class of
shares.  If the gain on the sale of our shares  were  subject  to United  States
federal income taxation,  the non-U.S.  shareholder will generally be subject to
the same  treatment  as a U.S.  shareholder  with  respect to its gain,  will be
required to file a United States federal income tax return  reporting that gain,
and in the case of corporate non-U.S.  shareholders might owe branch profits tax
under Section 884 of the Internal Revenue Code. A purchaser of our shares from a
non-U.S.  shareholder  will not be required to withhold on the purchase price if
the purchased shares are regularly traded on an established securities market or
if we are a domestically  controlled REIT. Otherwise,  a purchaser of our shares
from a non-U.S.  shareholder  may be required to  withhold  10% of the  purchase
price paid to the non-U.S.  shareholder  and to remit the withheld amount to the
IRS.

Backup Withholding and Information Reporting

         Information reporting and backup withholding may apply to distributions
or proceeds paid to our shareholders  under the  circumstances  discussed below.
Amounts  withheld under backup  withholding  are

                                       25


generally not an additional tax and may be refunded or credited against the REIT
shareholder's federal income tax liability.

         A U.S.  shareholder will be subject to backup withholding at a 31% rate
when it  receives  distributions  on our  shares  or  proceeds  upon  the  sale,
exchange, redemption,  retirement or other disposition of our shares, unless the
U.S. shareholder properly executes under penalties of perjury an IRS Form W-9 or
substantially similar form that:

     o    provides  the  U.S.  shareholder's  correct  taxpayer   identification
          number; and

     o    certifies that the U.S.  shareholder is exempt from backup withholding
          because it is a corporation or comes within  another exempt  category,
          it has not been  notified  by the IRS  that it is  subject  to  backup
          withholding,  or it has been  notified by the IRS that it is no longer
          subject to backup withholding.

If the U.S.  shareholder  does not provide its correct  taxpayer  identification
number on the IRS Form W-9 or  substantially  similar form, it may be subject to
penalties imposed by the IRS and the REIT or other applicable  withholding agent
may also have to withhold a portion of any capital  gain  distributions  paid to
it. Unless the U.S.  shareholder has established on a properly executed IRS Form
W-9 or  substantially  similar  form that it is a  corporation  or comes  within
another  exempt  category,  distributions  on our  shares  paid to it during the
calendar year, and the amount of tax withheld if any, will be reported to it and
to the IRS.

         Distributions  on our  shares to a  non-U.S.  shareholder  during  each
calendar year and the amount of tax withheld, if any, will generally be reported
to  the  non-U.S.  shareholder  and  to  the  IRS.  This  information  reporting
requirement applies regardless of whether the non-U.S. shareholder is subject to
withholding  on  distributions  on our shares or  whether  the  withholding  was
reduced or eliminated by an applicable tax treaty. Also, distributions paid to a
non-U.S. shareholder on our shares may be subject to backup withholding at a 31%
rate,  unless  the  non-U.S.   shareholder   properly   certifies  its  non-U.S.
shareholder  status  on an IRS Form  W-8 or  substantially  similar  form in the
manner  described  above.  Similarly,   information  reporting  and  31%  backup
withholding will not apply to proceeds a non-U.S.  shareholder receives upon the
sale,  exchange,  redemption,  retirement or other disposition of our shares, if
the non-U.S.  shareholder properly certifies its non-U.S.  shareholder status on
an IRS Form W-8 or  substantially  similar form. Even without having executed an
IRS Form W-8 or substantially  similar form,  however, in some cases information
reporting and 31% backup  withholding will not apply to proceeds that a non-U.S.
shareholder  receives upon the sale, exchange,  redemption,  retirement or other
disposition  of our shares if the non-U.S.  shareholder  receives those proceeds
through a broker's foreign office. As described above, new Treasury  regulations
alter the  information  reporting  and backup  withholding  rules  applicable to
non-U.S.  shareholders for payments made after December 31, 2000, and in general
these new Treasury  Regulations  replace IRS Forms W-8,  1001, and 4224 with the
new IRS Forms W-8 series.  For a non-U.S.  shareholder  whose income and gain on
our shares is  effectively  connected to the conduct of a United States trade or
business,  a slightly  different  rule may apply to proceeds  received  upon the
sale, exchange, redemption, retirement or other disposition of our shares. Until
the non-U.S. shareholder complies with the new Treasury regulations, information
reporting and 31% backup  withholding  may apply in the same manner as to a U.S.
shareholder,  and thus the non-U.S.  shareholder may have to execute an IRS Form
W-9 or substantially similar form to prevent the backup withholding.

Other Tax Consequences

         You should recognize that our and our shareholders'  federal income tax
treatment may be modified by legislative, judicial, or administrative actions at
any time,  which actions may be  retroactive  in effect.  The rules dealing with
federal income taxation are constantly under review by the Congress, the IRS and
the Treasury  Department,  and statutory  changes as well as promulgation of new
regulations,  revisions to existing regulations,  and revised interpretations of
established  concepts  occur  frequently.  No  prediction  can be made as to the
likelihood of passage of new tax legislation or other provisions either directly
or indirectly affecting us and our

                                       26


shareholders.  Revisions in federal income tax laws and interpretations of these
laws could adversely affect the tax consequences of an investment in our shares.
We and our  shareholders  may also be  subject  to state  or local  taxation  in
various  state  or  local  jurisdictions,  including  those  in  which we or our
shareholders  transact business or reside.  State and local tax consequences may
not be comparable to the federal income tax consequences discussed above.



                                       27


           ERISA PLANS, KEOGH PLANS AND INDIVIDUAL RETIREMENT ACCOUNTS

General Fiduciary Obligations

         Fiduciaries of a pension, profit-sharing or other employee benefit plan
subject  to Title I of the  Employee  Retirement  Income  Security  Act of 1974,
ERISA, must consider whether:

     o    their   investment  in  our  shares   satisfies  the   diversification
          requirements of ERISA;

     o    the  investment  is prudent in light of  possible  limitations  on the
          marketability of our shares;

     o    they have  authority  to  acquire  our  shares  under  the  applicable
          governing instrument and Title I of ERISA; and

     o    the   investment  is  otherwise   consistent   with  their   fiduciary
          responsibilities.

         Trustees  and other  fiduciaries  of an ERISA  plan may incur  personal
liability  for any loss  suffered by the plan on account of a violation of their
fiduciary  responsibilities.  In addition, these fiduciaries may be subject to a
civil  penalty of up to 20% of any amount  recovered by the plan on account of a
violation.  Fiduciaries  of any IRA,  Roth IRA,  Keogh  Plan or other  qualified
retirement  plan not  subject  to Title I of ERISA,  referred  to as  "non-ERISA
plans,"  should  consider  that  a plan  may  only  make  investments  that  are
authorized  by the  appropriate  governing  instrument.  Fiduciary  shareholders
should  consult their own legal  advisors if they have any concern as to whether
the investment is consistent with the foregoing criteria.

Prohibited Transactions

         Fiduciaries of ERISA plans and persons  making the investment  decision
for an IRA or other  non-ERISA  plan  should  consider  the  application  of the
prohibited  transaction  provisions  of ERISA and the  Internal  Revenue Code in
making their investment decision.  Sales and other transactions between an ERISA
plan or a non-ERISA plan, and persons related to it are prohibited transactions.
The  particular  facts   concerning  the   sponsorship,   operations  and  other
investments  of an ERISA plan or non-ERISA  plan may cause a wide range of other
persons to be  treated as  disqualified  persons  or  parties in  interest  with
respect to it. A  prohibited  transaction,  in addition  to  imposing  potential
personal  liability  upon  fiduciaries  of ERISA  plans,  may also result in the
imposition  of an excise tax under the Internal  Revenue Code or a penalty under
ERISA upon the  disqualified  person or party in  interest  with  respect to the
plan.  If  the  disqualified  person  who  engages  in  the  transaction  is the
individual  on  behalf  of  whom  an  IRA  or  Roth  IRA  is  maintained  or his
beneficiary,  the IRA or Roth IRA may lose its tax-exempt  status and its assets
may  be  deemed  to  have  been  distributed  to  the  individual  in a  taxable
distribution on account of the prohibited transaction, but no excise tax will be
imposed.  Fiduciary  shareholders  should consult their own legal advisors as to
whether the ownership of our shares involves a prohibited transaction.

Special Fiduciary and Prohibited Transactions Consequences

         The Department of Labor, which has administrative  responsibility  over
ERISA plans as well as non-ERISA plans,  has issued a regulation  defining "plan
assets." The regulation  generally provides that when an ERISA or non-ERISA plan
acquires a security that is an equity interest in an entity and that security is
neither a "publicly  offered  security"  nor a security  issued by an investment
company registered under the Investment Company Act of 1940, the ERISA plan's or
non-ERISA  plan's  assets  include  both the equity  interest  and an  undivided
interest  in  each  of  the  underlying  assets  of  the  entity,  unless  it is
established  either  that the  entity is an  operating  company  or that  equity
participation in the entity by benefit plan investors is not significant.

         Each  class of our shares  that is, our common  shares and any class of
preferred  shares that we may issue must be  analyzed  separately  to  ascertain
whether it is a publicly  offered  security.  The regulation  defines a

                                       28


publicly  offered  security  as  a  security  that  is  "widely  held,"  "freely
transferable"  and either  part of a class of  securities  registered  under the
Securities  Exchange  Act of  1934,  or sold  under  an  effective  registration
statement  under  the  Securities  Act of  1933,  provided  the  securities  are
registered  under the Securities  Exchange Act of 1934 within 120 days after the
end of the fiscal year of the issuer during which the offering occurred. All our
outstanding  shares have been  registered  under the Securities  Exchange Act of
1934.

         The regulation  provides that a security is "widely held" only if it is
part of a class of securities that is owned by 100 or more investors independent
of the  issuer  and of one  another.  However,  a  security  will not fail to be
"widely  held"  because  the number of  independent  investors  falls  below 100
subsequent  to the  initial  public  offering  as a result of events  beyond the
issuer's  control.  Our common  shares  have been  widely held and we expect our
common  shares to continue to be widely  held.  We expect the same to be true of
any class of preferred stock that we may issue,  but we can give no assurance in
that regard.

         The   regulation   provides   that   whether  a  security   is  "freely
transferable"  is a  factual  question  to be  determined  on the  basis  of all
relevant facts and circumstances.  The regulation further provides that, where a
security is part of an offering  in which the minimum  investment  is $10,000 or
less,  some   restrictions  on  transfer   ordinarily  will  not,  alone  or  in
combination, affect a finding that these securities are freely transferable. The
restrictions  on transfer  enumerated in the  regulation  as not affecting  that
finding include:

     o    any  restriction on or prohibition  against any transfer or assignment
          which would result in a termination or reclassification for federal or
          state tax purposes,  or would  otherwise  violate any state or federal
          law or court order;

     o    any  requirement  that advance  notice of a transfer or  assignment be
          given to the issuer and any requirement  that either the transferor or
          transferee,    or   both,   execute    documentation   setting   forth
          representations  as to compliance  with any  restrictions  on transfer
          which are among those  enumerated  in the  regulation as not affecting
          free  transferability,  including  those  described  in the  preceding
          clause of this sentence;

     o    any  administrative  procedure which establishes an effective date, or
          an  event  prior  to  which  a  transfer  or  assignment  will  not be
          effective; and

     o    any limitation or  restriction on transfer or assignment  which is not
          imposed by the issuer or a person acting on behalf of the issuer.

         We believe that the restrictions imposed under our declaration of trust
on the  transfer  of shares do not  result in the  failure  of our  shares to be
"freely  transferable."  Furthermore,  we believe that at present there exist no
other facts or circumstances  limiting the  transferability  of our shares which
are  not  included   among  those   enumerated  as  not  affecting   their  free
transferability  under the regulation,  and we do not expect or intend to impose
in the future, or to permit any person to impose on our behalf,  any limitations
or restrictions on transfer which would not be among the enumerated  permissible
limitations or restrictions.

         Assuming  that each class of our shares will be "widely  held" and that
no other facts and circumstances  exist which restrict  transferability of these
shares, we have received an opinion of our counsel Sullivan & Worcester LLP that
our  shares  will not  fail to be  "freely  transferable"  for  purposes  of the
regulation  due  to  the  restrictions  on  transfer  of the  shares  under  our
declaration  of trust and that under the  regulation  the  shares  are  publicly
offered  securities and our assets will not be deemed to be "plan assets" of any
ERISA plan or non-ERISA plan that invests in our shares.


                                       29


Item 2.  Properties

         At December 31, 1999, we had real estate  investments  totaling  $731.7
million,  at cost, after an impairment loss write-down and loan loss reserve, in
93 properties that were leased to or operated by nine tenants or mortgagors.  We
believe that the physical  plant of the  facilities in which we have invested is
suitable and adequate  for our present and any  proposed  uses.  At December 31,
1999, 18 properties  with an aggregate  cost of $427.4 million were mortgaged to
secure our bank credit facility.

         The following table summarizes some information about our properties as
of December 31, 1999.  All dollar  figures are in  thousands.  Certain  tenants'
obligations  to pay the  rents or  interest  stated  below  may be  affected  by
bankruptcy proceedings affecting those tenants. See "Item 1.  Business--Business
Developments--Tenant Financial Condition."




                                                                           Built/
Location                                   Property Type                Renovated(1)        Units/Beds(2)      Investment (3)
- - ---------------------------------------    ----------------------     ----------------     ----------------    --------------
                                                                                                                   (000s)
                                                                                                      
Marriott International, Inc.
Scottsdale, AZ                             Assisted Living                  1990                  148               $9,926
Sun City, AZ                               Assisted Living                  1990                  148               11,916
Laguna Hills, CA                           Congregate Care                  1991                  402               31,791
Boca Raton, FL                             Congregate Care                  1999                  347               44,836
Deerfield Beach, FL                        Congregate Care                  1986                  288               16,935
Fort Myers, FL                             Congregate Care                  1987                  463               23,905
Palm Harbor, FL                            Congregate Care                  1992                  319               33,863
Port St. Lucie, FL                         Assisted Living                  1993                  128               12,451
Arlington Heights, IL                      Congregate Care                  1986                  363               36,742
Silver Spring, MD                          Congregate Care                  1992                  351               33,080
Bellaire, TX                               Assisted Living                  1991                  145               12,410
Arlington, VA                              Congregate Care                  1992                  419               18,889
Charlottesville, VA                        Congregate Care                  1991                  315               29,829
Virginia Beach, VA                         Assisted Living                  1990                  114                8,948
                                                                                           ----------------    --------------
                                                                                                3,950              325,521

Brookdale Living Communities, Inc.
Mesa, AZ                                   Congregate Care                  1985                  185               14,800
Chicago, IL                                Congregate Care                  1990                  341               62,000
Brighton, NY                               Congregate Care                  1988                  103               10,700
Spokane, WA                                Congregate Care                  1993                  200               14,350
                                                                                           ----------------    --------------
                                                                                                  829              101,850

Mariner Post-Acute Network, Inc. (4)
Phoenix, AZ                                Nursing Home                     1984                  127                3,185
Yuma, AZ                                   Nursing Home                     1984                  128                2,326
Yuma, AZ                                   Congregate Care                  1984                   65                  708
Fresno, CA                                 Nursing Home                     1985                  180                3,503
Lancaster, CA                              Nursing Home                     1994                   99                3,488
Newport Beach, CA                          Nursing Home                     1994                  167                4,128
Stockton, CA                               Nursing Home                     1991                  122                3,136
Tarzana, CA                                Nursing Home                     1969                  192                3,060
Thousand Oaks, CA                          Nursing Home                     1970                  124                3,454
Van Nuys, CA                               Nursing Home                     1984                   58                1,319
Lakewood, CO                               Nursing Home                     1985                  175                4,721
Littleton, CO                              Nursing Home                     1965                  230                5,576

                                                                 30



                                                                           Built/
Location                                   Property Type                Renovated(1)        Units/Beds(2)      Investment (3)
- - ---------------------------------------    ----------------------     ----------------     ----------------    --------------
                                                                                                                   (000s)
                                                                                                      

Concord, NC                                Nursing Home                     1990                  110               $2,216
Wilson, NC                                 Nursing Home                     1990                  119                2,402
Winston-Salem, NC                          Nursing Home                     1990                   80                1,771
Huron, SD                                  Nursing Home                     1977                  163                3,256
Huron, SD                                  Congregate Care                  1968                   59                1,014
Sioux Falls, SD                            Nursing Home                     1979                  139                3,319
Brookfield, WI                             Nursing Home                     1995                  226                6,891
Clintonville, WI                           Nursing Home                     1965                   78                1,761
Clintonville, WI                           Nursing Home                     1969                  109                1,747
Madison, WI                                Nursing Home                     1987                   73                1,887
Milwaukee, WI                              Nursing Home                     1983                  215                5,043
Milwaukee, WI                              Nursing Home                     1997                  102                1,601
Pewaukee, WI                               Nursing Home                     1969                  237                3,416
Waukesha, WI                               Nursing Home                     1995                  105                5,752
                                                                                           ----------------    --------------
                                                                                                3,482               80,680
Integrated Health Services, Inc. (Lease No. 1) (4)
Canon City, CO (5)                         Nursing Home/ Senior
                                           Apartments                       1984                  157                6,520
Colorado Springs, CO                       Nursing Home                     1996                  132                5,481
Delta, CO                                  Nursing Home                     1978                  100                3,737
Grand Junction, CO                         Nursing Home                     1986                  120                4,408
Grand Junction, CO                         Nursing Home                     1995                   82                3,905
College Park, GA                           Nursing Home                     1985                  100                3,025
Dublin, GA                                 Nursing Home                     1968                  130                4,504
Glenwood, GA                               Nursing Home                     1972                   62                1,742
Marietta, GA                               Nursing Home                     1973                  109                3,037
Clarinda, IA                               Nursing Home                     1968                  117                1,823
Council Bluffs, IA                         Nursing Home                     1963                   62                1,217
Mediapolis, IA                             Nursing Home                     1973                   62                2,121
Pacific Junction, IA                       Nursing Home                     1978                   12                  343
Winterset, IA (5)                          Nursing Home/ Senior
                                           Apartments                       1995                  118                2,703
Ellinwood, KS                              Nursing Home                     1972                   59                1,320
Tarkio, MO                                 Nursing Home                     1996                   95                2,455
Ainsworth, NE (6)                          Nursing Home                     1995                   50                  445
Ashland, NE (6)                            Nursing Home                     1996                  101                1,851
Blue Hill, NE (6)                          Nursing Home                     1996                   81                1,119
Edgar, NE (6)                              Nursing Home                     1995                   54                  139
Grand Island, NE                           Nursing Home                     1996                   80                1,934
Gretna, NE (6)                             Nursing Home                     1995                   62                  940
Lyons, NE (6)                              Nursing Home                     1974                   84                  810
Milford, NE (6)                            Nursing Home                     1970                   66                  904
Sutherland, NE (6)                         Nursing Home                     1995                   62                1,270
Waverly, NE (6)                            Nursing Home                     1995                   50                1,215
Laramie, WY                                Nursing Home                     1986                  144                4,022
Worland, WY (5)                            Nursing Home/ Senior
                                           Apartments                       1996                   99                3,223
                                                                                           ----------------    --------------
                                                                                                2,450               66,213

                                                                 31



                                                                           Built/
Location                                   Property Type                Renovated(1)        Units/Beds(2)       Investment(3)
- - ---------------------------------------    ----------------------     ----------------     ----------------    --------------
                                                                                                                   (000s)
                                                                                                      

Integrated Health Services, Inc. (Lease No. 2) (4)
Cheshire, CT (7)                           Nursing Home                     1971                  210               $9,459
Waterbury, CT (7)                          Nursing Home                     1974                  180                5,247
New Haven, CT (7)                          Nursing Home                     1971                  195                5,716
Slidell, LA (6)                            Nursing Home                     1989                  118                4,277
Middleboro, MA                             Nursing Home                     1987                  124               17,523
Worcester, MA                              Nursing Home                     1990                  173               18,769
Boston, MA                                 Nursing Home                     1985                  201               24,978
Hyannis, MA                                Nursing Home                     1982                  142                8,292
Howell, MI (6)                             Nursing Home                     1985                  189                4,930
Farmington, MI (6)                         Nursing Home                     1991                  153                4,156
Canonsburg, PA                             Nursing Home                     1990                  140               15,598
                                                                                           ----------------    --------------
Burlington, NJ                             Nursing Home                     1994                  150               13,007
                                                                                           ----------------    --------------
                                                                                                  150               13,007

Private Company Tenants
St. Joseph, MO                             Nursing Home                     1976                  120                1,333
Seattle, WA                                Nursing Home                     1964                  103                5,192
Waterford, CT (8)                          Nursing Home                     1989                  148                5,253
Killingly, CT (8)                          Nursing Home                     1989                  190                6,060
Willimantic, CT (8)                        Nursing Home                     1989                  124                4,179
Grove City, OH                             Nursing Home                     1965                  200                3,445
                                                                                           ----------------    --------------
                                                                                                  885               25,462
                                                                                           ----------------    --------------
Total Portfolio                                                                                13,571             $731,678
                                                                                           ================    ==============
<FN>
(1)  The dates presented are the later of the date of original construction or the date of  substantial  renovation as  evidenced by
     capital expenditures in excess of 20% of HRPT's historical investment.
(2)  Units/beds are a customary measure of property values used in the senior housing industry.
(3)  Represents HRPT's carryforward historical costs before depreciation and, in some cases is net of impairment loss write-down and
     loan loss reserve.
(4)  Tenant or mortgagors subject to bankruptcy proceedings.
(5)  Two properties are located at each of these locations.
(6)  These properties are mortgage investments.
(7)  These three properties are managed by IHS. Under this management agreement, IHS has guaranteed the rent for these properties.
(8)  These properties were sold in February 2000.
</FN>



                                                           32


Item 3.  Legal Proceedings

         Although  in the  ordinary  course  of  business  we are or may  become
involved in legal  proceedings,  we have a limited operating history and are not
aware of any material pending legal proceedings  affecting any of our properties
for  which we might  become  liable.  However,  as  discussed  above in "Item 1.
Business--Business  Developments--Tenant  Financial  Condition,"  several of our
tenants have filed for bankruptcy,  and we are pursuing claims and  negotiations
in those bankruptcy proceedings. The amounts at stake in these tenant bankruptcy
proceedings are material.

Item 4.  Submission of Matters to a Vote of Security Holders

         No matters were submitted to a vote of  shareholders  during the fourth
quarter of the year covered by this Annual Report on Form 10-K.



                                       33


                                     PART II

Item 5.  Market for Registrant's Common Stock and Related Shareholder Matters

         Our Shares began trading on the New York Stock Exchange  (symbol:  SNH)
on October 12, 1999. The following table sets forth for the period indicated the
high and low  closing  sale  prices for the Shares as  reported  in the New York
Stock Exchange Composite Transactions reports.

                                                       High             Low
                                                       ----             ---
Fourth Quarter 1999 (since October 12, 1999)         $16 5/16         $11 1/16

         The closing price of the Shares on the New York Stock Exchange on March
27, 2000 was $9 7/8.

         As of March 27, 2000, there were approximately  5,229 holders of record
of the  Shares,  and we  estimate  that as of such date  there were in excess of
100,000 beneficial owners of the Shares.

         The following table sets forth the amount of distributions paid in 1999
and the respective annualized rates.

                                  Distribution                 Annualized
                                    Per Share               Distribution Rate
                                    ---------               -----------------
November 22, 1999                     $0.60                       $2.40

         All distributions have been paid and 100% of the 1999 distribution was
classified as ordinary income and there was no return of capital.  As previously
discussed,  two of  our  largest  tenants,  IHS  and  Mariner  have  experienced
significant  operating  losses in 1999.  Earlier  this year they both  filed for
bankruptcy.  These two  tenants are  responsible  for  approximately  48% of our
revenues.  We  have  reached  a  tentative  agreement  with  Mariner,  which  is
contingent  upon third party  approvals  and we continue to  negotiate  with IHS
regarding our future business  relationships.  A smaller tenant, Frontier Group,
Inc., which represents 2% of our revenues filed for bankruptcy  during 1999 and,
in February 2000 we sold these three properties for $13.0 million.  See "Item 1.
Business--Business  Developments--Tenant  Financial  Condition."  The  level  of
distributions to be made by us will depend, in part, on the final outcome of the
negotiations with these tenants.

         In order to qualify for the beneficial tax treatment  accorded to REITs
by Sections 856 through 860 of the  Internal  Revenue  Code,  we are required to
make  distributions  to shareholders  which annually will be at least 95% of our
taxable income.  All  distributions  will be made by us at the discretion of the
Trustees  and  will  depend  on  our  earnings,  our  cash  flow  available  for
distribution,  our financial  condition and other factors that the Trustees deem
relevant. We have in the past distributed, and intend to continue to distribute,
substantially  all of our real estate  investment  trust  taxable  income to our
shareholders.

         In October 1999,  pursuant to our Incentive  Share Award Plan,  our two
independent trustees at the time of our Spin-Off from HRPT each received a grant
of 500 Shares valued at $16.50 per Share, the average price of the Shares on the
NYSE on October 12, 1999 and our third independent trustee, who was subsequently
elected to the fill the  vacancy on our Board of  Trustees,  received a grant of
500 Shares  valued at $12.75 per Share,  the closing  price of the Shares on the
NYSE on October 21, 1999.  The grants were made pursuant to the  exemption  from
registration  contained  in  Section  4(2) of the  Securities  Act of  1933,  as
amended.

                                       34


Item 6.  Selected Financial Data

         Prior to October 12, 1999,  we and our  properties  were owned by HRPT.
The following  data is presented as if we were a separate  entity from HRPT. Set
forth below is selected financial data for the periods and dates indicated. This
financial data has been derived from HRPT's historical  financial statements for
periods prior to October 12, 1999.  Per share data has been  presented as if the
shares were outstanding for all periods prior to October 12, 1999. The following
table  includes  pro rata  allocations  of  interest  expense  and  general  and
administrative expenses for periods prior to October 12, 1999. In the opinion of
our  management,  the  methods  used for  allocating  interest  and  general and
administrative  expenses are reasonable.  However,  it is impossible to estimate
all  operating  costs that we would have incurred as a separate  public  company
from HRPT.  Accordingly,  the net income and funds from operations shown are not
necessarily  indicative  of results  that we may realize as a separate  company.
Additionally,  year to year  comparisions are impacted by property  acquisitions
during historical periods.  This data should be read in conjunction with, and is
qualified in its entirety by reference to, the consolidated financial statements
and accompanying  notes included herein in Item 14 of this Annual Report on Form
10-K. Amounts are in thousands, except per share information.


Income Statement Data:                                  Year Ended December 31,
                                      ------------------------------------------------------
                                        1999        1998       1997       1996       1995
                                      ------------------------------------------------------
                                                                  
Total revenues                        $ 90,790   $ 88,306   $ 84,171   $ 70,442   $ 66,604
Net income(1)                           14,834     46,236     44,723     36,441     31,062
Funds from operations (2)               67,091     64,533     62,549     51,824     45,810
Distributions                           15,601         --         --         --         --

Weighted average shares
outstanding                             26,000     26,000     26,000     26,000     26,000

Per share:
   Net income(1)                      $   0.57   $   1.78   $   1.72   $   1.40   $   1.19
   Funds from operations (2)              2.58       2.48       2.41       1.99       1.76
   Distributions                          0.60         --         --         --         --

Balance Sheet Data:                                       At December 31,
                                      ------------------------------------------------------
                                        1999        1998       1997       1996       1995
                                      ------------------------------------------------------
                                                                  
Real estate properties, at cost       $708,739   $732,393   $720,987   $692,034   $586,940
Real estate mortgages, net              22,939     37,826     38,134     38,270     37,798
Total assets                           654,000    686,296    692,586    679,201    587,701
Total indebtedness                     200,000         --         --         --         --
Total shareholders' equity             409,406    642,069    646,938    664,492    573,793

<FN>
(1)  Includes an impairment  loss write-down and loan loss reserve  totaling
     $30.0 million ($1.15 per share) for 1999.
(2)  Funds from operations or "FFO," as defined in the white paper on funds from operations
     which was approved by the Board of  Governors  of NAREIT in March 1995,  is net income
     computed in accordance with GAAP,  before gains or losses from sales of properties and
     extraordinary  items,  plus  depreciation  and  amortization  and after adjustment for
     unconsolidated  partnerships and joint ventures. Senior Housing considers FFO to be an
     appropriate  measure  of  performance  for an equity  REIT,  along with cash flow from
     operating  activities,  financing  activities  and  investing  activities,  because it
     provides investors with an indication of an equity REIT's ability to incur and service
     debt, make capital  expenditures,  pay distributions and fund other cash needs. Senior
     Housing computes FFO in accordance with the standards  established by NAREIT which may
     not be  comparable  to FFO  reported  by other  REITs  that do not  define the term in

                                            35


     accordance  with the current NAREIT  definition or that interpret the current NAREIT
     definition  differently.  FFO does not represent cash generated by operating activities
     in accordance  with GAAP and should not be considered as an  alternative to net income,
     determined in accordance  with GAAP, as an indication of financial  performance  or the
     cash flow from operating  activities,  determined in accordance with GAAP, as a measure
     of liquidity.
</FN>


Item 7. Management's  Discussion and Analysis of Financial Condition and Results
        of Operations

         The following information is provided in connection with, and should be
read in conjunction with, the Consolidated  Financial Statements included herein
as Item 14 of this Annual Report on Form 10-K.

RESULTS OF OPERATIONS

Year Ended December 31, 1999, Compared to 1998

         For the year  ended  December  31,  1999,  compared  to the year  ended
December 31, 1998,  total  revenues  increased by $2.5 million,  total  expenses
increased  by $33.9  million and net income  decreased by $31.4  million.  Total
revenues  increased due to the full year impact of the rent  generated from five
properties  acquired during 1998.  Total expenses  increased  primarily due to a
$30.0 million charge to income  consisting of a write-down for the impairment of
assets and a loan loss reserve. In addition,  depreciation  expense increased by
$4.0 million,  due to a change in the estimated useful lives of some real estate
properties and the full year impact of five properties acquired during 1998. Net
income was $14.8 million, or $0.57 per share, for the period ending December 31,
1999.  During the period ending December 31, 1998, net income was $46.2 million,
and on a pro forma 26.0 million average shares  outstanding net income was $1.78
per share.

         As previously announced,  three of our tenants,  Frontier,  Mariner and
IHS have filed for protection under the bankruptcy laws.  Frontier filed in July
1999,  Mariner filed in January 2000 and IHS filed in February 2000.  Bankruptcy
laws may allow  our  tenants  relief or  discharge  them  from  their  financial
obligations  to us. For 1999,  rental and mortgage  interest  income  related to
Frontier,  Mariner and IHS was $2.2 million,  $15.4  million and $26.6  million,
respectively.  At December 31, 1999 real estate  investments,  before impairment
loss  recognition and net of accumulated  depreciation,  for these three tenants
were $10.0 million, $68.3 million and $136.9 million,  respectively. We also had
mortgage investments,  before loss reserves,  related to IHS of $36.6 million at
December  31,  1999.  Based on  estimates  of future cash flows from  properties
leased to Mariner and IHS, we recognized an impairment in the carrying  value of
properties totaling $30.0 million.

         In February 2000,  all of the  properties  that were leased to Frontier
were sold for $13.0 million.  In March 2000, we repaid $12.0 million on our bank
credit facility.

         In March  2000,  we reached a  conditional  agreement  with  Mariner as
follows:

     o    Mariner's  lease  obligations  for all 26 properties  which we own and
          lease to Mariner will be terminated.

     o    Approximately  $24.0 million of cash and  securities  which we hold to
          secure Mariner's obligations will be retained by us.

     o    We  will  assume  operating   responsibilities  for  17  of  these  26
          properties.  Title to five of these  properties will be transferred to
          Mariner which will continue the operations. The remaining four nursing
          homes are now  subleased  to two  private  companies  and we expect to
          negotiate with these two subtenants for their continued  operations of
          those properties.


                                       36

Item 7. Management's  Discussion and Analysis of Financial Condition and Results
        of Operations - continued

Our agreement  with Mariner is contingent  upon approval by Mariner's  creditors
committee and the Delaware Bankruptcy Court before which Mariner's bankruptcy is
pending and required  regulatory  approvals  from various  states where affected
nursing homes are located.

         The three Frontier properties which have been sold and the five Mariner
properties which may be transferred for retention of the security deposits which
we hold have been  owned by us and our  predecessor,  HRPT  since 1987 and 1990,
respectively.  Because of previously recorded  depreciation and other accounting
requirements we expect to realize  accounting and tax gains as a result of these
transactions  during the first half of 2000. At the same time,  future  interest
savings from the  repayment of our bank credit  facility  with the proceeds from
the sale of the  Frontier  properties  and  operating  earnings  from the former
Mariner  properties  is  expected  to be less than the rent which we  previously
received from Mariner and Frontier, at least until the operations of the Mariner
properties  which are assumed by us are stabilized and those properties are sold
or  re-leased.  Because  we are still  pursuing  claims  for breach of lease and
rental  arrearages  for the former  Frontier  properties and because the Mariner
agreement is contingent and subject to possible changes,  the amount of gains or
reduced cash flow which we will realize  cannot be accurately  estimated at this
time.

         We are  currently in  negotiations  with IHS. The current  negotiations
include,  but are not  limited  to,  the  possibilities  that we will  sell  the
properties now leased to IHS, that lease terms may be changed,  that new tenants
may begin operations of these properties,  that properties may be operated by us
for our own account or mortgage  obligations due to us may be released for other
compensation.  No  assurances  can  be  made  as  to  if,  when  and  how  these
negotiations will be concluded. We may recognize additional gains or losses when
these negotiations are completed.

         Funds from  operations for the year ended December 31, 1999, were $67.1
million,  or $2.58 per share,  compared to $64.5 million, or $2.48 per share, in
1998. The increase is due to the full year impact of income from five properties
acquired during 1998.  Non-recurring  and non-cash losses excluded from the 1999
calculation of funds from operations aggregated $30.0 million. Distributions for
the year ended  December 31, 1999,  were $15.6 million or $0.60 per share.  Cash
flow provided by operating  activities and cash available for  distribution  may
not  necessarily  equal funds from  operations as cash flow is affected by other
factors not included in the funds from operations  calculation,  such as changes
in assets and liabilities.

Year Ended December 31, 1998, Compared to 1997

         For the year  ended  December  31,  1998,  compared  to the year  ended
December 31, 1997,  total  revenues  increased by $4.1 million,  total  expenses
increased  by $2.6  million  and net income  increased  by $1.5  million.  Total
revenues increased due to rent generated from the acquisition of five properties
during 1998 and the full year impact of the rent generated from five  properties
acquired  during 1997.  Total  expenses  increased  primarily  because of higher
allocated  interest  expense of $2.3  million,  which  resulted  from  increased
borrowings.  Net income was $46.2  million and $44.7  million for the year ended
December  31,  1998 and 1997,  respectively.  There  were no shares  outstanding
during these periods.  On a pro forma 26.0 million  average shares  outstanding,
net income per share would have been $1.78 and $1.72 for the year ended December
31, 1998 and 1997, respectively.

         Funds from  operations  increased  by $2.0  million  for the year ended
December  31,  1998,  compared  to the  prior  period  due to  income  from five
properties  acquired  during  1998 and the full year  impact of income from five
properties acquired during 1997.

                                       37


Item 7. Management's  Discussion and Analysis of Financial Condition and Results
        of Operations - continued

LIQUIDITY AND CAPITAL RESOURCES

         In September 1999, our registration statement on Form S-11, relating to
the  distribution  of 13.2 million of our common  shares to HRPT's  shareholders
(the  "Spin-Off")  was  declared   effective  by  the  Securities  and  Exchange
Commission.   Prior  to  the  Spin-Off,   we  had  26.0  million  common  shares
outstanding,  all of which  were  owned by  HRPT.  On  October  12,  1999,  HRPT
distributed  13.2 million of our common shares to HRPT's  shareholders of record
on October 8, 1999.

         At  December  31,  1999,  we had  cash and  cash  equivalents  of $17.1
million.  For the years  ended  December  31,  1999 and 1998,  cash  flows  from
operating  activities were $64.1 million and $60.2 million,  respectively,  cash
flows from investing  activities were $387,000 and $306,000,  respectively,  and
cash  used for  financing  activities  was  $47.5  million  and  $60.4  million,
respectively.  We expect that our current cash,  cash  equivalents,  future cash
flows from  operating  and financing  activities  will be sufficient to meet our
short-term and long-term working capital requirements.

         Total  assets  decreased  by $32.3  million  from $686.3  million as of
December 31, 1998, to $654.0  million as of December 31, 1999.  The decrease was
primarily due to the write-down resulting from impairment of assets, a loan loss
reserve provision and depreciation.

         On  September  1,  1999,  we  agreed  to pay  HRPT  $200  million  (the
"Formation Debt") in connection with the transfer to us of HRPT's 100% ownership
in one of the subsidiaries  that own some of our properties.  The Formation Debt
bore interest at HRPT's weighted average cost of debt,  (7.1%),  and was paid to
HRPT on October 13, 1999.

         In September  1999,  we entered into an agreement  for a $350  million,
three-year,  interest only bank credit facility secured by first mortgages on 18
properties.  The interest rate is LIBOR plus 2.0% per annum and will increase by
0.25% if our debt to total  capital,  as defined,  exceeds  50%. The bank credit
facility is available for acquisitions, working capital and for general business
purposes. We have the ability to repay and redraw amounts under this bank credit
facility until its maturity in 2002. Our bank credit facility  documentation has
customary   representations,   warranties,   covenants   and  event  of  default
provisions. The material restrictive financial covenants require us to:

     o    limit debt to no more than 60% of total capital, as defined;

     o    maintain a ratio of net income plus interest  expense and depreciation
          to interest expense of at least 1.5; and

     o    maintain a tangible net worth, as defined, of $450 million, subject to
          increases based on equity issuances.

         After the  Spin-Off,  we borrowed  $200 million  under this bank credit
facility  which we used to pay the Formation Debt to HRPT. At December 31, 1999,
we had $150 million available under the bank credit facility.  In March 2000, we
used  $12  million  of  proceeds  from  the sale of the  three  former  Frontier
properties to reduce amounts  outstanding under the bank credit facility to $188
million, leaving $162 million available to be borrowed.

         In the  short-term,  we expect to use the bank credit  facility to fund
our working capital needs for operations of the Mariner properties which we will
assume if the Mariner agreement described above is approved.


                                       38


Item 7. Management's  Discussion and Analysis of Financial Condition and Results
        of Operations - continued

         In both  the  short-term  and  the  long-term,  we  intend  to  acquire
additional senior housing  properties.  These purchases will be initially funded
with excess working  capital,  if any, and proceeds of borrowings under the bank
credit facility. We expect to repay bank credit facility borrowings periodically
with long-term debt or equity  capital.  We believe that we will have sufficient
access  to  capital  markets  to meet our  working  capital  needs,  our  growth
objectives  and  refinance our debt as needed.  However,  access to capital will
depend upon numerous factors,  including some beyond our control. We can provide
no  assurance  that we will be able to raise  additional  capital in  sufficient
amounts,  or at appropriate  costs,  to meet our working  capital needs, to fund
growth or to repay debt in both the short-term and the long-term.

Impact of Inflation

         Inflation  might  have  both  positive  and  negative  impact  upon our
business.  Inflation  might  cause the value of our real estate  investments  to
increase.  Similarly, in an inflationary environment, the percentage rents which
we receive based upon CPI increases or as a percentage of our tenants'  revenues
should  increase.  Also, rent yields we could charge for new  investments  would
likely increase.  Offsetting these benefits,  inflation might cause the costs of
equity and debt capital to increase. To mitigate the adverse impact of increased
costs  of debt  capital  in the  event of  material  inflation  we may  purchase
interest rate cap agreements.  The decision to enter into these  agreements will
be based on the amount of  floating  rate debt  outstanding  and our belief that
material  interest  rate  increases  are  likely  to  occur.  We do not  believe
inflation in the U.S.  economy  during the next few years will have any material
effect on our business.

Year 2000

         We experienced no disruptions in our  information  and  non-information
technology  systems and incurred no costs with  respect to year 2000 issues.  We
are not aware of any material  problems  resulting  from year 2000 issues by our
systems or the systems of our tenants or their material vendors and our material
vendors,  but will  continue to monitor  these  systems  throughout  the year to
ensure that any late year 2000 issues that may arise are addressed promptly.

Certain Considerations

         The discussion  and analysis of our financial  condition and results of
operations requires us to make estimates and assumptions and contains statements
of our beliefs,  intent or expectation  concerning  projections,  plans,  future
events and performance. The estimates, assumptions and statements, such as those
relating to the  approval of the Mariner  agreement,  our ability to operate and
stabilize  operations  at the Mariner  properties,  our ability to  successfully
negotiate with Mariner's subtenants,  our ability to successfully negotiate with
IHS, our ability to expand our portfolio, performance of our assets, the ability
to make  distributions,  our tax status as a "real estate investment trust," the
ability  to  appropriately  balance  the use of debt and  equity  and to  access
capital  markets,  depend upon various  factors over which we and/or our lessees
have  or  may  have  limited  or no  control.  Those  factors  include,  without
limitation,  the status of the economy, status of the capital markets (including
prevailing  interest rates),  compliance with the changes to regulations  within
the  healthcare  industry,  competition,  changes to federal,  state,  and local
legislation and other factors. We cannot predict the impact of these factors, if
any.  However,  these  factors  could cause our actual  results  for  subsequent
periods  to be  different  from  those  stated,  estimated  or  assumed  in this
discussion and analysis of our financial condition and results of operations. We
believe that our estimates and  assumptions  are  reasonable and prudent at this
time.


                                       39


Item 7A.  Quantitative and Qualitative Disclosures About Market Risk

         We are exposed to market changes in interest rates. Because interest on
all our outstanding  debt is at a floating rate,  changes in interest rates will
not affect the value of our outstanding debt  instruments.  However,  changes in
interest rates will affect our operating results. For example, the interest rate
payable on our outstanding indebtedness of $200 million at December 31, 1999, is
8.17% per annum.  An immediate  10% change in that  interest  rate or 81.7 basis
points, would increase or decrease our costs by $1.6 million, or $0.06 per share
per year:

                       Impact of Changes in Interest Rates
                             (dollars in thousands)

                                                        Total Interest
                           Interest Rate   Outstanding      Expense
                              Per Year        Debt          Per Year
                           --------------  -----------    -----------
At December 31, 1999          8.17%         $200,000       $ 16,340
10% reduction                 7.35%          200,000         14,700
10% increase                  8.99%          200,000         17,980

         The  foregoing  table  presents a  so-called  "shock"  analysis,  which
assumes that the interest rate change by 10%, or 81.7 basis points, is in effect
for a whole year. If interest rates were to change  gradually over one year, the
impact would be less.

         We borrow in U.S. dollars and all of our current borrowings are subject
to interest at LIBOR plus a premium.  Accordingly,  we are vulnerable to changes
in U.S. dollar based short-term rates, specifically LIBOR.

         During the past few months, short-term U.S. dollar based interest rates
have  tended  to rise.  We are  unable to  predict  the  direction  or amount of
interest  rate changes  during the next year.  We purchased an interest rate cap
agreement  on our  current  debt to protect  against  rate  increases  above 8%.
However,  we may incur additional debt at floating or fixed rates in the future,
which would increase our exposure to market changes in interest rates.

         We currently own real estate mortgages  receivable  inclusive of a loan
loss reserve with a carrying value of $22.9 million. When comparable term market
interest  rates  decline,  the  value  of  these  receivables  increases;   when
comparable  term  market  interest  rates rise,  the value of these  receivables
declines.  Using discounted cash flow analyses at a weighted  average  estimated
per year market rate for December 31, 1999 of 10.75%,  the estimated  fair value
of our mortgages receivable was $23.7 million.

         An immediate  10% change in the market rate of  interest,  or 108 basis
points,  applicable to our real estate mortgages receivable at December 31,1999,
would affect the fair value of those receivables as follows:

                                            Carrying Value of
                                               Real Estate
                          Interest Rate         Mortgages        Estimated Fair
                             Per Year          Receivable             Value
                          -------------     -----------------    --------------
                                         (dollars in thousands)
   Estimated market            10.75%            $22,939             $23,722
   10% reduction                9.67%             22,939              25,256
   10% increase                11.83%             22,939              22,328


                                       40


Item 7A.  Quantitative and Qualitative Disclosures About Market Risk - continued

         If the market rate changes occurred  gradually over time, the effect of
these changes  would be realized  gradually.  Because our real estate  mortgages
receivable  are fixed rate  instruments,  changes in market  interest rates will
have no effect on our operating  results unless these  receivables  are sold. At
this time, we expect to hold our existing mortgages to their maturity and not to
realize  any  profit or loss  from  trading  these  mortgages.  Also,  we do not
presently expect to expand our mortgage investments.

         The interest  rate changes that affect the  valuations of our mortgages
are U.S.  dollar  long-term  rates for corporate  obligations  of companies with
ratings similar to our mortgagors.

Item 8.  Financial Statements and Supplementary Data

         The information  required by this item is included herein in Item 14 of
this Annual Report on Form 10-K.

Item  9.  Changes  in and  Disagreements  with  Accountants  on  Accounting  and
Financial Disclosure

         Not applicable

                                    PART III

         The information in Part III (Items 10 11, 12 and 13) is incorporated by
reference to our definitive Proxy Statement,  which will be filed not later than
120 days after the end of our fiscal year.

                                       41


                                     PART IV

Item 14.  Exhibits, Financial Statement Schedules and Reports on Form 8-K

(a)      Index to Financial Statements and Financial Statement Schedules


                         SENIOR HOUSING PROPERTIES TRUST

                                                                                                                 Page
                                                                                                             
The following consolidated financial statements and financial statement schedules of Senior
    Housing  Properties  Trust are  included  herein on the pages indicated:
      Report of Ernst and  Young  LLP,  Independent Public Accountants                                            F-1
      Consolidated Balance Sheets as of December 31, 1999 and 1998                                                F-2
      Consolidated Statements of Income for each of the three  years in the periods ended
        December 31, 1999                                                                                         F-3
      Consolidated Statements of Shareholders' Equity for each of the three years in the periods
        ended December 31, 1999                                                                                   F-4
      Consolidated Statements of Cash Flows for each of the three years in the periods ended
        December 31, 1999                                                                                         F-5
      Notes to Consolidated Financial Statements                                                                  F-6
      Schedule III - Real Estate and Accumulated Depreciation                                                     S-1
      Schedule IV - Mortgage Loans on Real Estate                                                                 S-5


         All other  schedules  for  which  provision  is made in the  applicable
accounting  regulations  of the  Securities  and  Exchange  Commission  are  not
required under the related instructions, or are inapplicable, and therefore have
been omitted.

(b)      Reports on Form 8-K

         During  the  fourth  quarter of 1999,  we filed the  following  Current
Reports on Form 8-K:

         (i) Current Report on Form 8-K dated October 21, 1999,  relating to the
election of a new trustee (Item 5).

(c)      Exhibits

         2.1      Transaction Agreement,  dated September 21, 1999, between HRPT
                  Properties  Trust and the Company.  (Incorporated by reference
                  to the Current Report on Form 8-K filed on October 26, 1999 by
                  HRPT Properties Trust.)

         3.1      Amended and Restated Declaration of Trust.  (Filed herewith.)

         3.2      Amended  and  Restated  Bylaws,  as  amended  to date.  (Filed
                  herewith.)

         4.1      Form of temporary common share  certificate.  (Incorporated by
                  reference  to the  Company's  Registration  Statement  on Form
                  S-11, File No. 333-69703.)

         8.1      Opinion of Sullivan & Worcester LLP as to certain tax matters.
                  (Filed herewith.)

         10.1     Advisory Agreement,  dated as of October 12, 1999, between the
                  Company  and REIT  Management  &  Research,  Inc.  (+)  (Filed
                  herewith.)

                                       42


         10.2     1999  Incentive  Share  Award  Plan.  (+)   (Incorporated   by
                  reference  to the  Company's  Registration  Statement  on Form
                  S-11, File No. 333-69703.)

         10.3     Promissory Note, dated September 1, 1999, from the Company and
                  SPTMRT  Properties Trust, as makers, to HRPT Properties Trust,
                  as holder. (Incorporated by reference to the Current Report on
                  Form 8-K filed on October 26, 1999 by HRPT Properties Trust.)

         10.4     Revolving  Loan  Agreement,  dated as of  September  15, 1999,
                  among the Company,  Dresdner  Bank AG, the Other Lenders Party
                  Thereto,  SPTMRT  Properties  Trust  and  SPTBrook  Properties
                  Trust,  together with  Exhibits and Form of Mortgage,  Form of
                  Deed of Trust and Form of Pledge  Agreement.  (Incorporated by
                  reference  to the  Company's  Registration  Statement  on Form
                  S-11, File No. 333-69703.)

         10.5     Master Lease Agreement, dated as of December 27, 1996, between
                  Health and Retirement Properties Trust and BLC Property,  Inc.
                  (Incorporated  by  reference  to  the  Company's  Registration
                  Statement on Form S-11, File No. 333-69703.)

         10.6     Guaranty  Agreement,   dated  as  of  December  27,  1996,  by
                  Brookdale   Living   Communities,   Inc.,   Brookdale   Living
                  Communities of Illinois, Inc., Brookdale Living Communities of
                  New York, Inc., and Brookdale  Living  Communities of Arizona,
                  Inc.  in favor of  Health  and  Retirement  Properties  Trust.
                  (Incorporated  by  reference  to  the  Company's  Registration
                  Statement on Form S-11, File No. 333-69703.)

         10.7     First  Amendment  to Master  Lease  Agreement  and  Incidental
                  Documents,  dated as of May 7, 1997,  by and among  Health and
                  Retirement  Properties  Trust, BLC Property,  Inc.,  Brookdale
                  Living  Communities  of  Washington,  Inc.,  Brookdale  Living
                  Communities of Arizona,  Inc., Brookdale Living Communities of
                  Illinois,  Inc.,  Brookdale  Living  Communities  of New York,
                  Inc.,  Brookdale  Living  Communities,  Inc,  The Prime Group,
                  Inc.,  Prime  International,  Inc.,  PGLP,  Inc.,  Prime Group
                  Limited Partnership, and Prime Group II, L.P. (Incorporated by
                  reference  to the  Company's  Registration  Statement  on Form
                  S-11, File No. 333-69703.)

         10.8     Representative  Lease for properties leased to subsidiaries of
                  Marriott International, Inc. (Incorporated by reference to the
                  Company's  Registration  Statement  on  Form  S-11,  File  No.
                  333-69703.)

         10.9     Representative  Guaranty  of Tenant  Obligations,  dated as of
                  October 8, 1993, by Marriott  International,  Inc. in favor of
                  HMC Retirement Properties,  Inc. (Incorporated by reference to
                  the Company's  Registration  Statement on Form S-11,  File No.
                  333-69703.)

         10.10    Representative  First Amendment to Lease for properties leased
                  to subsidiaries of Marriott International,  Inc. (Incorporated
                  by reference to the Company's  Registration  Statement on Form
                  S-11, File No. 333-69703.)

         10.11    Representative Assignment and Assumption of Leases, Guarantees
                  and Permits for properties  leased to subsidiaries of Marriott
                  International,   Inc.   (Incorporated   by  reference  to  the
                  Company's  Registration  Statement  on  Form  S-11,  File  No.
                  333-69703.)

         10.12    Representative Second Amendment of Lease for properties leased
                  to subsidiaries of Marriott International,  Inc. (Incorporated
                  by reference to the Company's  Registration  Statement on Form
                  S-11, File No. 333-69703.)

                                       43


         10.13    Representative   First   Amendment  of  Guaranty  by  Marriott
                  International, Inc., dated as of May 16, 1994, in favor of HMC
                  Retirement Properties,  Inc. (Incorporated by reference to the
                  Company's  Registration  Statement  on  Form  S-11,  File  No.
                  333-69703.)

         10.14    Assignment  of  Lease,  dated  as of  June  16,  1994,  by HMC
                  Retirement   Properties,   Inc.   in  favor  of   Health   and
                  Rehabilitation Properties Trust. (Incorporated by reference to
                  the Company's  Registration  Statement on Form S-11,  File No.
                  333-69703.)

         10.15    Third  Amendment  to  Facilities  Lease,  dated as of June 30,
                  1994,  between HMC  Retirement  Properties,  Inc. and Marriott
                  Senior Living Services, Inc. (Incorporated by reference to the
                  Company's  Registration  Statement  on  Form  S-11,  File  No.
                  333-69703.)

         10.16    Third  Amendment  to  Facilities  Lease,  dated as of June 30,
                  1994,  between HMC  Retirement  Properties,  Inc. and Marriott
                  Senior Living Services, Inc. (Incorporated by reference to the
                  Company's  Registration  Statement  on  Form  S-11,  File  No.
                  333-69703.)

         10.17    Consent and  Modification  Agreement,  dated as of October 10,
                  1997, between Marriott  International,  Inc.,  Marriott Senior
                  Living  Services,  Inc.,  New Marriott  MI,  Inc.,  Health and
                  Retirement  Properties  Trust,  and Church Creek  Corporation.
                  (Incorporated  by  reference  to  the  Company's  Registration
                  Statement on Form S-11, File No. 333-69703.)

         10.18    Master Lease Document,  General Terms and Conditions  dated as
                  of  December  28,  1990,  between  Health  and  Rehabilitation
                  Properties  Trust and AMS Properties,  Inc.  (Incorporated  by
                  reference  to the  Company's  Registration  Statement  on Form
                  S-11, File No. 333-69703.)

         10.19    Representative   Lease  for   properties   leased  to  Mariner
                  Post-Acute  Network,  Inc.  (Incorporated  by reference to the
                  Company's  Registration  Statement  on  Form  S-11,  File  No.
                  333-69703.)

         10.20    Lease  dated  as  of  March  27,  1992,   between  Health  and
                  Rehabilitation  Properties  Trust  and  AMS  Properties,  Inc.
                  (Incorporated  by  reference  to  the  Company's  Registration
                  Statement on Form S-11, File No. 333-69703.)

         10.21    Amendment  to Master Lease  Document  dated as of December 29,
                  1993 between Health and  Rehabilitation  Properties  Trust and
                  AMS  Properties,   Inc.  (Incorporated  by  reference  to  the
                  Company's  Registration  Statement  on  Form  S-11,  File  No.
                  333-69703.)

         10.22    Amendment to AMS Properties,  Inc. Facility Leases dated as of
                  October 1, 1994 between Health and Retirement Properties Trust
                  and AMS  Properties,  Inc.  (Incorporated  by reference to the
                  Company's  Registration  Statement  on  Form  S-11,  File  No.
                  333-69703.)

         10.23    Amendment  to  AMS  Properties,  Inc.  Facility  Leases  dated
                  October  31, 1997  between  Health and  Retirement  Properties
                  Trust and AMS Properties,  Inc.  (Incorporated by reference to
                  the Company's  Registration  Statement on Form S-11,  File No.
                  333-69703.)

         10.24    Representative   Lease  for   properties   leased  to  Mariner
                  Post-Acute  Network,  Inc.  (Incorporated  by reference to the
                  Company's  Registration  Statement  on  Form  S-11,  File  No.
                  333-69703.)

         10.25    Master  Lease  Agreement  dated  as of  June  30,  1992 by and
                  between  Health and  Rehabilitation  Properties  Trust and GCI
                  Health Care Centers,  Inc.  (Incorporated  by reference to the
                  Company's  Registration  Statement  on  Form  S-11,  File  No.
                  333-69703.)

                                       44


         10.26    Amended and Restated HRP Shares Pledge Agreement,  dated as of
                  June 30, 1992, between Health and Retirement  Properties Trust
                  and AMS  Properties,  Inc.  (Incorporated  by reference to the
                  Company's  Registration  Statement  on  Form  S-11,  File  No.
                  333-69703.)

         10.27    Amended and Restated Voting Trust Agreement,  dated as of June
                  30, 1992 from AMS Properties,  Inc. to HRPT Advisors, Inc., as
                  voting  trustee.  (Incorporated  by reference to the Company's
                  Registration Statement on Form S-11, File No. 333-69703.)

         10.28    Representative   Lease  for   properties   leased  to  Mariner
                  Post-Acute  Network,  Inc.  (Incorporated  by reference to the
                  Company's  Registration  Statement  on  Form  S-11,  File  No.
                  333-69703.)

         10.29    Representative   Lease  for   properties   leased  to  Mariner
                  Post-Acute  Network,  Inc.  (Incorporated  by reference to the
                  Company's  Registration  Statement  on  Form  S-11,  File  No.
                  333-69703.)

         10.30    Amendment  to Master Lease  Document  dated as of December 29,
                  1993 between Health and  Rehabilitation  Properties  Trust and
                  GCI Health Care Centers,  Inc.  (Incorporated  by reference to
                  the Company's  Registration  Statement on Form S-11,  File No.
                  333-69703.)

         10.31    Amendment  to GCI Health  Care  Centers,  Inc.,  Master  Lease
                  Document  and  Facility  Leases  dated as of  October  1, 1994
                  between Health and Retirement  Properties Trust and GCI Health
                  Care Centers, Inc. (Incorporated by reference to the Company's
                  Registration Statement on Form S-11, File No. 333-69703.)

         10.32    Amendment to GCI Health Care  Centers,  Inc.  Facility  Leases
                  dated   October  31,  1997  between   Health  and   Retirement
                  Properties   Trust  and  GCI   Health   Care   Centers,   Inc.
                  (Incorporated  by  reference  to  the  Company's  Registration
                  Statement on Form S-11, File No. 333-69703.)

         10.33    Guaranty, Cross Default and Cross Collateralization Agreement,
                  dated as of June 30, 1992, by and among AMS Properties,  Inc.,
                  CGI Health Care  Centers,  Inc. and Health and  Rehabilitation
                  Properties Trust.  (Incorporated by reference to the Company's
                  Registration Statement on Form S-11, File No. 333-69703.)

         10.34    Guaranty,  dated as of October 31, 1997,  by Grancare  Inc. in
                  favor of Health and Retirement Properties Trust. (Incorporated
                  by reference to the Company's  Registration  Statement on Form
                  S-11, File No. 333-69703.)

         10.35    Guaranty,  dated as of October  31,  1997,  by Paragon  Health
                  Network,  Inc.  in favor of Health and  Retirement  Properties
                  Trust.   (Incorporated   by   reference   to   the   Company's
                  Registration Statement on Form S-11, File No. 333-69703.)

         10.36    Amended,  Restated and  Consolidated  Master  Lease  Document,
                  dated as of September 24, 1997,  between Health and Retirement
                  Properties Trust and ECA Holdings, Inc.,  Marietta/SCC,  Inc.,
                  Glenwood/SCC,  Inc.,  Dublin/SCC,  Inc., and College Park/SCC,
                  Inc.  (Incorporated by reference to the Company's Registration
                  Statement on Form S-11, File No. 333-69703.)

         10.37    Guaranty By  Integrated  Health  Services,  Inc.,  dated as of
                  September 24, 1997, by Integrated  Health  Services,  Inc., in
                  favor of Health and Retirement  Properties Trust (Incorporated
                  by reference to the Company's  Registration  Statement on Form
                  S-11, File No. 333-69703.)

         10.38    Representative   Lease  Agreement  for  properties  leased  to
                  Integrated Health Services, Inc. (Incorporated by reference to
                  the Company's  Registration  Statement on Form S-11,  File No.
                  333-69703.)

                                       45


         10.39    Representative   Lease  Agreement  for  properties  leased  to
                  Integrated Health Services, Inc. (Incorporated by reference to
                  the Company's  Registration  Statement on Form S-11,  File No.
                  333-69703.)

         10.40    Guaranty,  dated as of February 11 1994, by Horizon Healthcare
                  Corporation in favor of Health and  Rehabilitation  Properties
                  Trust.   (Incorporated   by   reference   to   the   Company's
                  Registration Statement on Form S-11, File No. 333-69703.)

         10.41    Consent,  Assumption  and  Guaranty  Agreement,  dated  as  of
                  December 31, 1997, by and among  Integrated  Health  Services,
                  Inc., IHS  Acquisition No. 108, Inc., IHS Acquisition No. 112,
                  Inc., IHS  Acquisition No. 113, Inc., IHS Acquisition No. 135,
                  Inc., IHS  Acquisition No. 148, Inc., IHS Acquisition No. 152,
                  Inc., IHS  Acquisition No. 153, Inc., IHS Acquisition No. 154,
                  Inc., IHS  Acquisition No. 155, Inc., IHS Acquisition No. 175,
                  Inc., Healthsouth Corporation, Horizon Healthcare Corporation,
                  Health  and  Retirement   Properties   Trust,   and  Indemnity
                  Collection  Corporation.  (Incorporated  by  reference  to the
                  Company's  Registration  Statement  on  Form  S-11,  File  No.
                  333-69703.)

         12.1     Statement regarding  computation of ratio of earnings to fixed
                  charges. (Filed herewith.)

         21.1     List of Subsidiaries. (Filed herewith.)

         23.1     Consent of Sullivan &  Worcester  LLP.  (Contained  In Exhibit
                  8.1.)

         27.1     Financial Data Schedule.  (Filed herewith.)

         ----------------------
         (+)      Management contract or compensatory plan or arrangement.


                                       46


                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS





To the Trustees and Shareholders of Senior Housing Properties Trust

We have audited the accompanying  consolidated  balance sheets of Senior Housing
Properties Trust as of December 31, 1999 and 1998, and the related  consolidated
statements of income,  shareholders' equity and cash flows for each of the three
years in the period  ended  December  31,  1999.  Our audits also  included  the
financial  statements  and  schedules  listed in the Index at Item 14(a).  These
financial  statements  and  schedules  are the  responsibility  of the Company's
management.  Our  responsibility  is to express  an  opinion on these  financial
statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States. Those standards require that we plan and perform the audit
to obtain reasonable  assurance about whether the financial  statements are free
of material misstatement. An audit includes examining, on a test basis, evidence
supporting  the amounts and  disclosures in the financial  statements.  An audit
also includes assessing the accounting principles used and significant estimates
made by  management,  as well as  evaluating  the  overall  financial  statement
presentation.  We believe  that our audits  provide a  reasonable  basis for our
opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material respects, the financial position of Senior Housing Properties Trust
and  subsidiaries  as of  December  31,  1999 and 1998 and the  results of their
operations  and their cash flows for each of the three years in the period ended
December 31, 1999, in conformity with accounting  principles  generally accepted
in the United  States.  Also, in our opinion,  the related  financial  statement
schedules,  when considered in relation to the basic financial  statements taken
as a whole,  present fairly in all material  respects the  information set forth
therein.

                                               /s/ Ernst & Young LLP
Boston, Massachusetts
March 17, 2000



                                      F-1






                                          SENIOR HOUSING PROPERTIES TRUST

                                            CONSOLIDATED BALANCE SHEETS
                                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)


                                                                                         December 31,
                                                                          ---------------------------------------
                                                                                1999                  1998
                                                                          -----------------      ----------------

                                                                                                
ASSETS
Real estate properties, at cost, (including properties leased to affiliates
  with a cost of $20,422 in 1999 and $38,270 in 1998):
    Land                                                                         $69,673               $69,673
    Buildings and improvements                                                   639,066               662,720
                                                                          -----------------      ----------------
                                                                                 708,739               732,393
    Accumulated depreciation                                                    (108,709)              (94,616)
                                                                          -----------------      ----------------
                                                                                 600,030               637,777

Real estate mortgages receivable, net of loan loss reserve of $14,500
  in 1999                                                                         22,939                37,826
Cash and cash equivalents                                                         17,091                   139
Other assets                                                                      13,940                10,554
                                                                          -----------------      ----------------
                                                                                $654,000              $686,296
                                                                          =================      ================


LIABILITIES AND SHAREHOLDERS' EQUITY
Bank notes payable                                                              $200,000                   $--
Deferred rents and other deferred revenues                                        26,715                28,266
Security deposits                                                                 15,235                15,235
Other liabilities                                                                  2,317                   726
Due to affiliate                                                                     327                    --

Commitments and contingencies                                                         --                    --

Shareholders' equity:
    Common shares of beneficial interest, $0.01 par value:
      50,000,000 shares authorized, 26,001,500 shares and 26,374,760
      shares issued and outstanding, respectively                                    260                   264
    Additional paid-in capital                                                   444,511                    --
    Cumulative net loss                                                          (19,764)                   --
    Distributions                                                                (15,601)                   --
    Ownership interest of HRPT Properties Trust                                       --               641,805
                                                                          -----------------      ----------------
      Total shareholders' equity                                                 409,406               642,069
                                                                          -----------------      ----------------
                                                                                $654,000              $686,296
                                                                          =================      ================



See accompanying notes


                                      F-2




                                          SENIOR HOUSING PROPERTIES TRUST

                                         CONSOLIDATED STATEMENTS OF INCOME
                                 (AMOUNTS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)




                                                                           Year Ended December 31,
                                                          -----------------------------------------------------------
                                                                1999                 1998                 1997
                                                          -----------------    -----------------    -----------------

                                                                                                
    Revenues:
        Rental income                                           $84,881              $82,542             $78,463
        Interest and other income                                 5,909                5,764               5,708
                                                          -----------------    -----------------    -----------------
          Total revenues                                         90,790               88,306              84,171
                                                          -----------------    -----------------    -----------------

    Expenses:
        Interest                                                 18,768               19,293              16,958
        Depreciation                                             22,247               18,297              17,826
        General and administrative                                4,941                4,480               4,664
        Loan loss reserve                                        14,500                   --                  --
        Impairment of assets                                     15,500                   --                  --
                                                          -----------------    -----------------    -----------------
          Total expenses                                         75,956               42,070              39,448
                                                          -----------------    -----------------    -----------------

    Net income                                                  $14,834              $46,236             $44,723
                                                          =================    =================    =================


    Weighted average shares outstanding (note 2)                 26,000               26,000              26,000
                                                          =================    =================    =================

    Basic and diluted earnings per share data:

          Net income                                              $0.57                $1.78               $1.72
                                                          =================    =================    =================



See accompanying notes



                                      F-3




                                          SENIOR HOUSING PROPERTIES TRUST

                                  CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
                                              (DOLLARS IN THOUSANDS)


                                                                                                        Ownership
                                                                                                       Interest of
                                                         Additional                                        HRPT
                                Number of   Common         Paid-in      Cumulative                      Properties
                                 Shares       Shares       Capital       Net Loss     Distributions       Trust          Total
                              ------------  -----------  ------------  -------------  ---------------  -------------  ------------
                                                                                                   
Balance at
  December 31, 1996                    --          $--           $--           $--              $--       $664,492      $664,492
Net income                             --          --             --            --               --         44,723        44,723
Owner distribution, net                --          --             --            --               --        (62,277)      (62,277)
                              ------------  -----------  ------------  -------------  ---------------  -------------  ------------
Balance at
  December 31, 1997                    --          --             --            --               --        646,938       646,938
Net income                             --          --             --            --               --         46,236        46,236
Owner distribution, net                --          --             --            --               --        (51,369)      (51,369)
Issuance of shares             26,374,760         264             --            --               --             --           264
                              ------------  -----------  ------------  -------------  ---------------  -------------  ------------
Balance at
  December 31, 1998            26,374,760         264             --            --               --        641,805       642,069
Net income (January 1 to
  October 11)                          --          --             --            --               --         34,598        34,598
Owner distribution, net                --          --             --            --               --        (31,919)      (31,919)
Cancellation of shares           (374,760)         (4)            --            --               --              4            --
Distribution of shares to
HRPT shareholders                      --          --        444,488            --               --       (644,488)     (200,000)
Net loss (October 12 to
  December 31)                         --          --             --       (19,764)              --             --       (19,764)
Distributions                          --          --             --            --          (15,601)            --       (15,601)
Issuance of shares                  1,500          --             23            --               --             --            23
                              ------------  -----------  ------------  -------------  ---------------  -------------  ------------
Balance at
  December 31, 1999            26,001,500        $260       $444,511      $(19,764)        $(15,601)           $--      $409,406
                              ============  ===========  ============  =============  ===============  =============  ============


See accompanying notes

                                      F-4




                                          SENIOR HOUSING PROPERTIES TRUST

                                       CONSOLIDATED STATEMENTS OF CASH FLOWS
                                              (DOLLARS IN THOUSANDS)




                                                                               Year Ended December 31,
                                                                 -----------------------------------------------------
                                                                      1999               1998               1997
                                                                 ----------------    --------------     --------------
                                                                                                   
CASH FLOWS FROM OPERATING ACTIVITIES:
   Net income                                                         $14,834            $46,236            $44,723
   Adjustments to reconcile net income to cash
           provided by operating activities:
       Depreciation                                                    22,247             18,297             17,826
       Impairment of assets and loan loss reserve                      30,000                 --                 --
       Changes in assets and liabilities:
           Other assets                                                (3,363)            (2,876)            (2,394)
           Deferred rents and other deferred revenues                  (1,551)            (1,455)            22,087
           Security deposits                                               --                 --              8,815
           Other liabilities                                            1,591                 34                 37
           Due to affiliate                                               327                 --                 --
                                                                 ----------------    --------------     --------------
       Cash provided by operating activities                           64,085             60,236             91,094
                                                                 ----------------    --------------     --------------

CASH FLOWS FROM INVESTING ACTIVITIES:
   Real estate acquisitions and improvements                               --                 (2)           (19,799)
   Investments in mortgage loans                                           --                 --               (124)
   Repayments of mortgage loans                                           387                308                260
                                                                 ----------------    --------------     --------------
       Cash provided by (used for) investing activities                   387                306            (19,663)
                                                                 ----------------    --------------     --------------

CASH FLOWS FROM FINANCING ACTIVITIES:
   Owner's net distribution                                           (31,919)           (60,403)           (71,431)
   Distributions                                                      (15,601)                --                 --
   Proceeds from borrowing                                            200,000                 --                 --
   Repayment of Formation Debt due to HRPT
          Properties Trust                                           (200,000)                --                 --
                                                                 ----------------    --------------     --------------
       Cash used for financing activities                             (47,520)           (60,403)           (71,431)
                                                                 ----------------    --------------     --------------

Increase in cash and cash equivalents                                  16,952                139                 --
Cash and cash equivalents at beginning of period                          139                 --                 --
                                                                 ----------------    --------------     --------------
Cash and cash equivalents at end of period                            $17,091               $139                $--
                                                                 ================    ==============     ==============

SUPPLEMENTAL CASH FLOW INFORMATION:
   Interest paid                                                       $2,446                $--                $--

NON-CASH INVESTING ACTIVITIES:
   Real estate acquisitions                                                --             (9,298)            (9,154)

NON-CASH FINANCING ACTIVITIES:
   Formation Debt due to HRPT Properties Trust                        200,000                 --                 --
   Owner's  contribution                                                   --              9,298              9,154
   Issuance of common shares                                               23                 --                 --


See accompanying notes

                                      F-5


                         SENIOR HOUSING PROPERTIES TRUST

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


Note 1.  Organization

            The consolidated  financial  statements of Senior Housing Properties
Trust include the accounts of 81  properties  and 12 mortgages  receivable  (the
"Properties")  and of Senior Housing  Properties Trust ("Senior Housing Trust").
The Properties and Senior Housing Trust are collectively  referred to as "Senior
Housing".  These  consolidated  financial  statements are presented as if Senior
Housing  was a legal  entity  separate  from  HRPT  Properties  Trust  ("HRPT");
although no such entity existed until October 12, 1999.  Senior Housing operates
in a single segment.

            HRPT organized Senior Housing Trust, a 100% owned subsidiary through
October 11, 1999,  as a Maryland  real estate  investment  trust on December 16,
1998. At the time of its organization,  Senior Housing Trust issued 26.4 million
shares to HRPT for consideration of $263,748.  Subsequently,  0.4 million shares
were cancelled and 26.0 million shares are currently issued and outstanding.

            For a substantial part of the periods presented, the Properties were
owned by HRPT. On or about June 30, 1999,  the  Properties  were  transferred by
HRPT to several of its 100% owned  subsidiaries.  Effective  as of  September 1,
1999, HRPT transferred 100% ownership of the several subsidiaries, which own the
Properties,  to Senior Housing Trust. On October 12, 1999, HRPT distributed 13.2
million  shares  of its  26.0  million  Senior  Housing  Trust  shares  to  HRPT
shareholders (the "Spin-Off").

Note 2.  Summary of Significant Accounting Policies

BASIS OF PRESENTATION. Prior to the Spin-Off, all of Senior Housing was owned by
HRPT, and transactions have been presented at HRPT's historical basis.  Prior to
the Spin-Off  substantially  all the rental income and mortgage  interest income
received by HRPT from the tenants and mortgagors of Senior Housing was deposited
in and commingled with HRPT's general funds.  Funds for capital  investments and
other cash required by Senior  Housing was provided by HRPT.  Prior to September
1, 1999,  interest  expense was allocated  based on HRPT's  historical  interest
expense  as a  percentage  of HRPT's  average  historical  costs of real  estate
investments.  General and administrative  costs of HRPT for the periods prior to
the  Spin-Off  were  allocated  to Senior  Housing  based on  HRPT's  investment
advisory  agreement  formula and other costs were allocated  based on historical
costs  as a  percentage  of  HRPT's  average  historical  costs  of real  estate
investments.  In the opinion of management,  the methods for allocating interest
and general and administrative expenses were reasonable.  It was not practicable
to estimate  additional costs that would have been incurred by Senior Housing as
a separate entity.

REAL ESTATE  PROPERTIES AND MORTGAGE  INVESTMENTS.  Depreciation  on real estate
properties is expensed on a straight-line  basis over estimated  useful lives of
up to 40 years for  buildings and  improvements  and up to 12 years for personal
property.  During  1999,  the  estimated  useful  lives of certain  real  estate
properties  were changed.  The effect reduced net income and earnings per share,
for the period  ending  December  31,  1999,  $3.8  million and $0.15 per share,
respectively.  Impairment losses on properties are recognized when indicators of
impairment  are  present  and  the  estimated,  undiscounted  cash  flows  to be
generated  by the  properties  are less than the  carrying  amount of  concerned
properties.

CASH AND CASH  EQUIVALENTS.  Cash and cash  equivalents  consisting of overnight
repurchase  agreements and short-term  investments  with original  maturities of
three  months or less at the date of purchase  are carried at cost plus  accrued
interest which approximates market.

INTEREST RATE CAP  AGREEMENTS.  Senior Housing has entered into an interest rate
cap  agreement  to limit  exposure to the risk of rising  interest  rates.  This
arrangement,  which  expires in  December  2001,  has a notional  amount of $200
million.  Senior Housing will be entitled to receive  payments by a counterparty
should LIBOR increase above a threshold amount.


                                      F-6

                         SENIOR HOUSING PROPERTIES TRUST

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


REVENUE  RECOGNITION.  Rental  income from  operating  leases is recognized on a
straight-line  basis over the life of the lease  agreements.  Interest income is
recognized  as earned  over the terms of the real estate  mortgages.  Percentage
rent and  supplemental  mortgage  interest income are recognized as earned.  For
interim periods,  percentage rent and supplemental  mortgage interest income are
accrued prior to  achievement of specified  targets when the  achievement of the
targets is  probable.  For the years ended  December  31,  1999,  1998 and 1997,
percentage  rent and  supplemental  mortgage  interest  income  aggregated  $4.0
million, $2.9 million and $2.9 million, respectively.

EARNINGS PER COMMON SHARE.  Because Senior Housing's operations were included in
the consolidated  financial statements of HRPT prior to the Spin-Off,  there are
no shareholder  equity accounts for Senior Housing prior to 1999.  Common shares
outstanding  of 26.0  million  at October  12,  1999 have been  included  in the
earnings per share calculation as if the shares were outstanding for all periods
prior to October 12, 1999.  Earnings  per common  share are  computed  using the
weighted average number of shares outstanding during the period.  Senior Housing
has no common share equivalents,  instruments  convertible into common shares or
other dilutive instruments.

USE OF ESTIMATES.  Preparation of these financial  statements in conformity with
generally accepted  accounting  principles requires management to make estimates
and  assumptions  that may  affect  the  amounts  reported  in  these  financial
statements  and  related  notes.  The actual  results  could  differ  from these
estimates.

INCOME TAXES. Prior to the Spin-Off,  Senior Housing's  operations were included
in HRPT's  income tax  returns.  Senior  Housing and HRPT qualify as real estate
investment  trusts  under  the  Internal  Revenue  Code  of  1986,  as  amended.
Accordingly,  they are not  expected  to be  subject  to  federal  income  taxes
provided they  distribute  their  taxable  income and continue to meet the other
requirements for qualifying as a real estate investment trust. However, they are
subject to state and local taxes on their income and property.

NEW ACCOUNTING  PRONOUNCEMENTS.  The Financial Accounting Standards Board issued
Statement No. 133 "Accounting for Derivative Instruments and Hedging Activities"
("FAS 133") in 1998,  which was further amended by Statement No. 137 "Accounting
for Derivative  Instruments and Hedging Activities - Deferral of Effective Date
of FASB  Statement  No.  133" in  1999.  FAS 133  must be  adopted  for the 2001
financial  statements.  Senior  Housing  believes  adoption  of  FAS  133 is not
expected to have a  significant  impact on its reported  financial  condition or
results of operations.

Note 3.  Report of Tenants' Financial Condition

         Three  of  Senior   Housing's   tenants,   The  Frontier  Group,   Inc.
("Frontier"), Mariner Post-Acute Network, Inc. ("Mariner") and Integrated Health
Services, Inc. ("IHS") have filed for protection under bankruptcy laws. Frontier
filed in July  1999,  Mariner  filed in January  2000 and IHS filed in  February
2000. For 1999, rental income and mortgage interest related to Frontier, Mariner
and IHS was $2.2 million,  $15.4  million and $26.6  million,  respectively.  At
December 31, 1999 real estate  investments,  before  impairment loss recognition
and net of accumulated depreciation, for these three tenants were $10.0 million,
$68.3 million and $136.9 million, respectively. Senior Housing also had mortgage
investments,  before loss reserves,  related to IHS of $36.6 million at December
31, 1999.

         Senior  Housing has concluded  that  impairment  indicators are present
with  respect  to  properties   operated  by  these  tenants  and  has  prepared
undiscounted  cash flow projections for each of the properties.  For purposes of
these projections,  Senior Housing has assumed that rents on some properties may
be modified  and that some of the leases may be  terminated  after which  Senior
Housing will operate the properties for a period of time and,  ultimately,  sell
them. In addition,  a third party not in  bankruptcy  has  guaranteed  the lease
obligations  of some of the  properties  operated by one of the tenants.  Senior
Housing has assumed that the  guarantor  will honor the lease  obligations.  The
undiscounted cash flow projections  reflect the expected rents to be earned over
the lease term and the expected cash flows earned from  operating the properties
for a  period  of time  plus  the  proceeds

                                      F-7

                         SENIOR HOUSING PROPERTIES TRUST

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

from  assumed  future sales of the  properties.  Cash flows during the period in
which  Senior  Housing may operate the  properties  are  estimated  based on the
historical performance of each property,  excluding rent paid to Senior Housing.
Projected  sale prices are based on an estimated per bed value  consistent  with
industry  practice and reflect prices that Senior Housing has observed in recent
transactions.  Based on these undiscounted cash flow projections, Senior Housing
has  concluded  that  certain of its real estate and  mortgage  investments  are
impaired as of December 31, 1999.  Based on its  estimates of fair values net of
selling costs,  Senior Housing has written down the carrying value of these real
estate  investments,  including  investments  leased to an  affiliate,  Advisors
Healthcare Group, Inc. ("Advisors Health"), as of December 31, 1999 by recording
an impairment  loss  write-down in the  accompanying  consolidated  statement of
income of $15.5  million.  In addition,  Senior Housing has recorded a loan loss
reserve  of $14.5  million  related to the  mortgage  investment  it  considered
impaired. It is reasonably possible that estimates of future cash flows could be
reduced significantly  depending on the outcome of the bankruptcy proceedings or
if the third party should fail to honor its guarantee.  As a result,  additional
losses could be recognized in future periods and the amounts could be material.

         In February 2000,  Senior Housing sold all of the properties  that were
leased to Frontier for $13.0  million.  Senior  Housing is  continuing to pursue
claims  against  Frontier  and other  parties  for  breach of its leases and for
rental  arrearages.  The amount of net gain, if any,  which may be realized from
the sale of the  Frontier  properties  will  depend  upon the  outcome  of these
claims.  The  amount  of  gain  or  loss  to be  realized  as a  result  of this
transaction is not expected to be material.  Because these  properties have been
sold, Senior Housing will no longer receive rental income from these properties.

         In March 2000,  Senior  Housing  reached an agreement in principle with
Mariner  whereby  Mariner may be released  from its lease  obligations,  certain
security  deposits  held by Senior  Housing may be  retained by Senior  Housing,
certain  properties  now  operated by Mariner  will in the future be operated by
Senior  Housing,  and  other  properties  now owned by  Senior  Housing  will be
conveyed to Mariner.  If this agreement is approved  Senior Housing expects that
it may  realize  gains and that its future  earnings  and cash flows may be less
than the rent  previously  earned from the Mariner  leases,  at least on a short
term basis.  This  agreement is  contingent  upon third party  approvals  beyond
Senior  Housing's  control.  If and when this  agreement is  implemented  it may
result in additional material gains or losses.

         Senior  Housing is  currently  in  negotiations  with IHS.  The current
negotiations  include,  but are not  limited to, the  possibilities  that Senior
Housing will sell some of the  properties,  that lease or mortgage  terms may be
changed,  that new tenants may begin  operations of properties,  that properties
may be  operated  by  Senior  Housing  for its  own  account  or  that  mortgage
obligations due to Senior Housing may be released for other compensation. Senior
Housing may recognize  additional  gains or losses when these  negotiations  are
completed and the additional gains or losses may be material.

Note 4.  Real Estate Properties

         The  owned  Properties  are  generally  leased on a triple  net  basis,
pursuant to noncancellable, fixed term operating leases expiring between 2001 to
2019.  Generally,  the leases to a single tenant or group of affiliated  tenants
are  cross-defaulted  and  cross-guaranteed,  and provide for all or none tenant
renewal options at existing rates followed by several market rate renewal terms.
These  triple  net  leases  generally  require  the  lessee to pay all  property
operating costs.

         The future  minimum  lease  payments to be received  during the current
terms of the leases, as of December 31, 1999, were  approximately  $78.3 million
in 2000,  $78.0 million in 2001,  $79.4 million in 2002,  $79.6 million in 2003,
$79.4  million in 2004 and $602.7  million  thereafter.  These  future  payments
include  minimum  lease  payments from IHS and Mariner of $36.3 million in 2000,
$36.5  million in 2001,  $36.6  million in 2002,  $36.8  million in 2003,  $36.9
million in 2004, and $179.9 million thereafter.

                                      F-8


                         SENIOR HOUSING PROPERTIES TRUST

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


Note 5.  Real Estate Mortgages Receivable

                                                        December 31,
                                            ------------------------------------
                                                  1999                1998
                                            -----------------    ---------------
                                                   (dollars in thousands)
Mortgage notes receivable due December 2016           $8,693             $8,769
Mortgage note receivable due January 2013                883                883
Mortgage note receivable due December 2010            18,777             18,992
Mortgage note receivable due January 2006              9,086              9,182
                                            -----------------    ---------------
                                                      37,439             37,826
Loan loss reserve                                    (14,500)                --
                                            -----------------    ---------------
                                                     $22,939            $37,826
                                            =================    ===============

           At December 31, 1999,  the interest  rates on these notes  receivable
ranged from 10.3% to 13.75% per annum.  In 1999 Senior  Housing  established  an
allowance of $14.5  million for the  impairment  of a real estate  mortgage loan
with a face value of $18.8 million.

Note 6.  Shareholders' Equity

           Senior  Housing has  reserved  1,300,000  shares of Senior  Housing's
common shares under the terms of the 1999 Incentive Share Award Plan (the "Award
Plan").  During 1999, the three  Independent  Trustees,  as part of their annual
fee, were each granted 500 common shares from this plan.  The shares  granted to
the  Trustees  vest  immediately.  At December  31,  1999,  1,298,500  of Senior
Housing's common shares remain reserved for issuance under the Award Plan.

           In January 2000,  Senior Housing declared a distribution of $0.60 per
share which was distributed on February 24, 2000.  Distributions  per share paid
by Senior Housing for 1999 were $0.60 per share, or approximately $15.6 million.

Note 7.  Commitments and Contingencies

          At December 31, 1999 and 1998,  Senior  Housing had total  commitments
aggregating $3.7 million to fund or finance improvements to the Properties.

Note 8.  Transactions with Affiliates

          Senior  Housing has entered into an agreement  with REIT  Management &
Research,  Inc.  ("REIT  Management")  to provide  investment,  management  and
administrative  services.  Gerard M. Martin and Barry M.  Portnoy,  who serve as
managing  trustees  of  Senior  Housing  and  HRPT,  own REIT  Management.  REIT
Management is paid by Senior Housing based on a formula amount of gross invested
assets in the properties.  Investment advisory fees for 1999, 1998 and 1997 with
respect to Senior Housing's invested assets were $3.9 million,  $3.8 million and
$3.7 million,  respectively.  Beginning with the year ending  December 31, 2000,
REIT  Management  will also be entitled to an incentive  fee, paid in restricted
shares, based on a formula.

          Messrs.  Martin and Portnoy  are  principal  shareholders  of Advisors
Health  (formerly  known as  Connecticut  Subacute  Corporation  II), which is a
lessee of Senior  Housing.  The lease  with  Advisors  Health is based on market
terms and is  generally  similar to Senior  Housing's  leases with  unaffiliated
companies.  These  properties are managed by IHS. Senior Housing recorded rental
income of $4.5 million as a result of this lease during each of the years ending
December 31, 1999, 1998 and 1997.


                                      F-9

                         SENIOR HOUSING PROPERTIES TRUST

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 9.  Indebtedness

          In September 1999, Senior Housing entered into an agreement for a $350
million,  three-year,  interest  only,  bank  credit  facility.  The bank credit
facility is secured by 18 properties, with a net book value of $380.2 million at
December  31,  1999,  and  matures in 2002.  The  interest  rate is LIBOR plus a
premium (8.17% at December 31, 1999) and will increase if Senior  Housing's debt
to total capital, as defined,  meets or exceeds 50%. The bank credit facility is
available for acquisitions,  working capital and for general business  purposes.
On October 13, 1999,  $200 million,  used to pay the formation debt due to HRPT,
was outstanding under the bank credit facility.

Note 10.  Fair Value of Financial Instruments and Commitments

          The financial statements presented include mortgage investments, rents
receivable, other liabilities and security deposits. Except as follows, the fair
values of the financial  instruments and commitments to fund  improvements  were
not materially  different  from their  carrying  values at December 31, 1999 and
1998:


                                                         1999                                1998
                                            --------------------------------    -------------------------------
                                               Carrying                           Carrying
                                                Amount          Fair Value         Amount          Fair Value
                                            ---------------    -------------    --------------    -------------
                                                 (dollars in thousands)              (dollars in thousands)
                                                                                         
Real estate mortgages receivable, net           $22,939          $23,722            $37,826          $40,525
Commitments to fund improvements                     --            3,707                 --            3,707
Interest rate cap agreement                          --              341                 --               --


          The fair values of the real estate  mortgages  and  interest  rate cap
agreement  are  based on  estimates  using  discounted  cash flow  analyses  and
currently  prevailing market rates. The fair value of the commitments  represent
the actual amounts committed.

                                      F-10

                         SENIOR HOUSING PROPERTIES TRUST

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 11.  Concentration of Credit Risk

          The assets included in these financial statements are primarily income
producing senior housing real estate located  throughout the United States.  The
following is a summary of the  significant  lessees and mortgagors as of and for
the years ended December 31, 1999 and 1998:


                                                                                           Year Ending
                                                    December 31, 1999                   December 31, 1999
                                              -------------------------------      -----------------------------
                                                                    % of                               % of
                                                Investment          Total            Revenue           Total
                                              ---------------    ------------      -------------    ------------
                                                   (dollars in thousands)              (dollars in thousands)
                                                                                               
Marriott International, Inc.                     $325,521              45%            $30,893              35%
Integrated Health Services, Inc.                  185,158              25              26,615              30
Brookdale Living Communities, Inc.                101,850              14              11,174              13
Mariner Post-Acute Network, Inc.                   80,680              11              15,449              17
Frontier Group, Inc.                               15,492               2               2,160               2
All others                                         22,977               3               2,786               3
                                              ---------------    ------------      -------------    ------------
                                                 $731,678             100%            $89,077             100%
                                              ===============    ============      =============    ============


                                                                                           Year Ending
                                                    December 31, 1998                   December 31, 1998
                                              --------------- -- ------------      ------------- -- ------------
                                                                    % of                               % of
                                                Investment          Total            Revenue           Total
                                              ---------------    ------------      -------------    ------------
                                                   (dollars in thousands)              (dollars in thousands)
                                                                                               
Marriott International, Inc.                     $325,521              42%            $30,270              35%
Integrated Health Services, Inc.                  217,893              29              26,841              31
Brookdale Living Communities, Inc.                101,850              13              11,074              13
Mariner Post-Acute Network, Inc.                   86,486              11              13,620              16
Frontier Group, Inc.                               15,492               2               2,160               2
All others                                         22,977               3               2,792               3
                                              ---------------    ------------      -------------    ------------
                                                 $770,219             100%            $86,757             100%
                                              ===============    ============      =============    ============



                                      F-11

                         SENIOR HOUSING PROPERTIES TRUST

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


Note 12.  Selected Quarterly Financial Data (unaudited)

          The following is a summary of the  quarterly  results of operations of
Senior Housing for 1999 and 1998. The dollars are in thousands  except per share
amounts.

                                                1999
                        ------------------------------------------------------
                           First       Second         Third         Fourth
                          Quarter      Quarter       Quarter        Quarter
                        ------------ ------------ --------------- ------------
Revenues                    $22,668      $22,622         $22,621      $22,879
Net income (loss) (1)        10,971       10,861          11,176      (18,174)
Per share data:
   Net income (loss)           0.42         0.42            0.43        (0.70)

                                                1998
                        ------------------------------------------------------
                           First       Second         Third         Fourth
                          Quarter      Quarter       Quarter        Quarter
                        ------------ ------------ --------------- ------------
Revenues                    $21,496      $21,714         $21,711      $23,385
Net income                   11,134       11,537          11,012       12,553
Per share data:
   Net income                  0.43         0.44            0.42         0.48


(1)  Reflects an  impairment  loss,  as  described  in note 3, during the Fourth
Quarter


                                      F-12




                                               SENIOR HOUSING PROPERTIES TRUST
                                                        SCHEDULE III
                                          REAL ESTATE AND ACCUMULATED DEPRECIATION
                                                      December 31, 1999
                                                   (Dollars in thousands)

                          Initial Cost                             Gross Amount Carried at Close
                           to Company                                    of Period 12/31/99
                         ----------------                           ---------------------------
                               Buildings  Costs Capitalized                Buildings                                       Original
                                  and     Subsequent to                       and                Accumulated     Date   Construction
  Location       State   Land  Equipment   Acquisition  Impairment  Land   Equipment  Total(1)  Depreciation(2) Aquired     Date
- - ------------------------------------------------------------------------------------------------------------------------------------
                                                                                            
Yuma              AZ     $103       $604        $1         $--      $103       $605       $708       $129       06/30/92     1984
Phoenix           AZ      655      2,525         5          --       655      2,530      3,185        544       06/30/92     1963
Yuma              AZ      223      2,100         3          --       223      2,103      2,326        445       06/30/92     1984
Scottsdale        AZ      979      8,807       140          --       990      8,936      9,926      1,256       05/16/94     1990
Sun City          AZ    1,174     10,569       173          --     1,189     10,727     11,916      1,486       06/17/94     1990
Mesa              AZ    1,480     13,320         -          --     1,480     13,320     14,800      1,013       12/27/96     1985
Newport Beach     CA    1,176      1,729     1,223          --     1,176      2,952      4,128        676       12/28/90     1962
Fresno            CA      738      2,577       188          --       738      2,765      3,503        727       12/28/90     1963
Van Nuys          CA      716        378       225          --       718        601      1,319        175       12/28/90     1969
Thousand Oaks     CA      622      2,522       310          --       622      2,832      3,454        721       12/28/90     1965
Tarzana           CA    1,277        977       806          --     1,278      1,782      3,060        456       12/28/90     1969
Lancaster         CA      601      1,859     1,028          --       601      2,887      3,488        695       12/28/90     1969
Stockton          CA      382      2,750         4          --       382      2,754      3,136        585       06/30/92     1968
Laguna Hills      CA    3,132     28,184       475          --     3,172     28,619     31,791      3,788       09/09/94     1975
Littleton         CO      185      5,043       348          --       185      5,391      5,576      1,378       12/28/90     1965
Lakewood          CO      232      3,766       723          --       232      4,489      4,721      1,094       12/28/90     1972
Grand Junction    CO      204      3,875       329          --       204      4,204      4,408        781       12/30/93     1968
Grand Junction    CO        6      2,583     1,316          --       136      3,769      3,905        624       12/30/93     1978
Colorado Springs  CO      245      5,236         -          --       245      5,236      5,481        300       09/26/97     1972
Delta             CO      167      3,570         -          --       167      3,570      3,737        204       09/26/97     1963
Canon City        CO      292      6,228         -          --       292      6,228      6,520        357       09/26/97     1970
Killingly         CT      240      5,360       460          --       240      5,820      6,060      2,123       05/15/87     1972
Willimantic       CT      134      3,566       479          --       166      4,013      4,179      1,411       05/15/87     1965
Waterford         CT       86      4,714       453          --        86      5,167      5,253      1,952       05/15/87     1965
Cheshire          CT      520      7,380     1,559          --       520      8,939      9,459      3,204       11/01/87     1963
Waterbury         CT    1,003      9,023       915      (5,694)    1,003      4,244      5,247        445       05/11/92     1974
New Haven         CT    1,681     14,953     1,236     (12,154)    1,681      4,035      5,716        667       05/11/92     1971
Deerfield Beach   FL    1,664     14,972       299          --     1,690     15,245     16,935      2,143       05/16/94     1986
Palm Harbor       FL    3,327     29,945       591          --     3,379     30,484     33,863      4,285       05/16/94     1992
Boca Raton        FL    4,404     39,633       799          --     4,474     40,362     44,836      5,673       05/20/94     1994
Port St. Lucie    FL    1,223     11,009       219          --     1,242     11,209     12,451      1,575       05/20/94     1993
Fort Myers        FL    2,349     21,137       419          --     2,385     21,520     23,905      2,892       08/16/94     1984


                                      S-1



                                               SENIOR HOUSING PROPERTIES TRUST
                                                        SCHEDULE III
                                          REAL ESTATE AND ACCUMULATED DEPRECIATION
                                                      December 31, 1999
                                                   (Dollars in thousands)

                          Initial Cost                             Gross Amount Carried at Close
                           to Company                                    of Period 12/31/99
                         ----------------                           ---------------------------
                               Buildings  Costs Capitalized                Buildings                                       Original
                                  and     Subsequent to                       and                Accumulated     Date   Construction
  Location       State   Land  Equipment   Acquisition  Impairment  Land   Equipment  Total(1)  Depreciation(2) Aquired     Date
- - ------------------------------------------------------------------------------------------------------------------------------------
                                                                                            
Marietta          GA      300      2,702        35          --       300      2,737      3,037        292       05/15/96     1967
Dublin            GA      442      3,982        80          --       442      4,062      4,504        432       05/15/96     1968
Glenwood          GA      174      1,564         4          --       174      1,568      1,742        160       05/15/96     1972
College Park      GA      300      2,702        23          --       300      2,725      3,025        304       05/15/96     1985
Mediapolis        IA       94      1,776       251          --        94      2,027      2,121        366       12/30/93     1973
Winterset         IA      111      2,099       493          --       111      2,592      2,703        454       12/30/93     1973
Clarinda          IA       77      1,453       293          --        77      1,746      1,823        308       12/30/93     1968
Pacific Junction  IA       32        306         5          --        32        311        343         40       04/01/95     1978
Council Bluffs    IA      225        893        99          --       225        992      1,217        189       04/01/95     1963
Arlington Heights IL    3,621     32,587       534          --     3,665     33,077     36,742      4,377       09/09/94     1986
Chicago           IL    6,200     55,800         -          --     6,200     55,800     62,000      4,243       12/27/96     1990
Ellinwood         KS      130      1,137        53          --       130      1,190      1,320        155       04/01/95     1972
Middleboro        MA    1,771     15,752         -          --     1,771     15,752     17,523      4,676       05/01/88     1970
Worcester         MA    1,829     15,071     1,869          --     1,829     16,940     18,769      6,608       05/01/88     1970
Boston            MA    2,164     20,836     1,978          --     2,164     22,814     24,978      8,345       05/01/89     1968
Hyannis           MA      829      7,463         -          --       829      7,463      8,292      2,240       05/11/92     1972
Silver Spring     MD    3,229     29,065       786          --     3,301     29,779     33,080      4,063       07/25/94     1992
St. Joseph        MO      111      1,027       195          --       111      1,222      1,333        185       06/04/93     1976
Tarkio            MO      102      1,938       415          --       102      2,353      2,455        408       12/30/93     1970
Concord           NC       90      2,126         -          --        90      2,126      2,216        544       09/10/98     1990
Wilson            NC       27      2,375         -          --        27      2,375      2,402        606       09/10/98     1990
Winston-Salem     NC       75      1,696         -          --        75      1,696      1,771        429       09/10/98     1990
Grand Island      NE      119      1,446       369          --       119      1,815      1,934        195       04/01/95     1963
Burlington        NJ    1,300     11,700         7          --     1,300     11,707     13,007      1,245       09/29/95     1994
Brighton          NY    1,070      9,630         -          --     1,070      9,630     10,700        732       12/27/96     1988
Grove City        OH      332      3,081        32          --       332      3,113      3,445        508       06/04/93     1965
Canonsburg        PA    1,499     13,493       606          --     1,518     14,080     15,598      4,675       03/01/91     1985
Huron             SD       45        968         1          --        45        969      1,014        204       06/30/92     1968
Sioux Falls       SD      253      3,062         4          --       253      3,066      3,319        647       06/30/92     1960
Huron             SD      144      3,108         4          --       144      3,112      3,256        654       06/30/92     1968


                                      S-2



                                               SENIOR HOUSING PROPERTIES TRUST
                                                        SCHEDULE III
                                          REAL ESTATE AND ACCUMULATED DEPRECIATION
                                                      December 31, 1999
                                                   (Dollars in thousands)

                          Initial Cost                             Gross Amount Carried at Close
                           to Company                                    of Period 12/31/99
                         ----------------                           ---------------------------
                               Buildings  Costs Capitalized                Buildings                                       Original
                                  and     Subsequent to                       and                Accumulated     Date   Construction
  Location       State   Land  Equipment   Acquisition  Impairment  Land   Equipment  Total(1)  Depreciation(2) Aquired     Date
- - ------------------------------------------------------------------------------------------------------------------------------------
                                                                                            
Bellaire          TX    1,223     11,010       177          --     1,238     11,172     12,410      1,570       05/16/94     1991
Virginia Beach    VA      881      7,926       141          --       893      8,055      8,948      1,132       05/16/94     1990
Charlottesville   VA    2,936     26,422       471          --     2,976     26,853     29,829      3,719       06/17/94     1991
Arlington         VA    1,859     16,734       296          --     1,885     17,004     18,889      2,320       07/25/94     1992
Seattle           WA      256      4,869        67          --       256      4,936      5,192        938       11/01/93     1964
Spokane           WA    1,035     13,315         -          --     1,035     13,315     14,350        938       05/07/97     1993
Brookfield        WI      834      3,849     8,014      (5,806)      834      6,057      6,891        470       12/28/90     1964
Clintonville      WI       49      1,625        87          --        30      1,731      1,761        436       12/28/90     1965
Clintonville      WI       14      1,695        38          --        14      1,733      1,747        438       12/28/90     1960
Madison           WI      144      1,633       110          --       144      1,743      1,887        439       12/28/90     1920
Waukesha          WI       68      3,452     2,232          --        68      5,684      5,752      1,189       12/28/90     1958
Milwaukee         WI      277      3,883         -          --       277      3,883      4,160        883       03/27/92     1969
Milwaukee         WI      232      1,368         1          --       232      1,369      1,601        319       09/10/98     1970
Pewaukee          WI      984      2,432         -          --       984      2,432      3,416        589       09/10/98     1963
Worland           WY      132      2,503       588          --       132      3,091      3,223        526       12/30/93     1970
Laramie           WY      191      3,632       199          --       191      3,831      4,022        715       12/30/93     1964
                     --------  ---------  --------  ----------  --------  ---------  ---------  ---------
Grand Total           $69,030   $628,080   $35,283    ($23,654)  $69,673   $639,066   $708,739   $108,709
                     ========  =========  ========  ==========  ========  =========  =========  =========
<FN>
(1)   Aggregate cost for federal income tax purposes is approximately $770,860.
(2)   Depreciation is provided for on buildings and improvements for periods ranging up to 40 years and on equipment up to 12 years.
(3)   Represents acquisition dates of HRPT Properties Trust.
</FN>


                                      S-3



                                               SENIOR HOUSING PROPERTIES TRUST
                                                        SCHEDULE III
                                          REAL ESTATE AND ACCUMULATED DEPRECIATION
                                                      December 31, 1999
                                                   (Dollars in thousands)

                          Initial Cost                             Gross Amount Carried at Close
                           to Company                                    of Period 12/31/99
                         ----------------                           ---------------------------
                               Buildings  Costs Capitalized                Buildings                                       Original
                                  and     Subsequent to                       and                Accumulated     Date   Construction
  Location       State   Land  Equipment   Acquisition  Impairment  Land   Equipment  Total(1)  Depreciation(2) Aquired     Date
- - ------------------------------------------------------------------------------------------------------------------------------------


                 Reconciliation  of the  carrying  amount  of  real  estate  and
                 equipment and accumulated  depreciation at the beginning of the
                 period:
                                                                   Real Estate and              Accumulated
                                                                      Equipment                Depreciation
                                                                 --------------------         ----------------
                                                                                              
                 Balance at January 1, 1997                             $692,034                    $56,387
                    Additions                                             28,953                     17,826
                                                                 --------------------         ----------------
                 Balance at December 31, 1997                            720,987                     74,213
                    Additions                                             11,406                     20,403
                                                                 --------------------         ----------------
                 Balance at December 31, 1998                            732,393                     94,616
                    Additions                                                  -                     22,247
                    Impairment                                           (23,654)                    (8,154)
                                                                 --------------------         ----------------
                 Balance at December 31, 1999                           $708,739                   $108,709
                                                                 ====================         ================



                                      S-4




                                               SENIOR HOUSING PROPERTIES TRUST
                                                         SCHEDULE IV
                                                MORTGAGE LOANS ON REAL ESTATE
                                                      December 31, 1999
                                                   (Dollars in thousands)
                                                                                                                 Principal Amount of
                                                                                                                    Loans Subject to
                                                                                                             Carrying     Delinquent
                                Final                                                        Face Value of   Value of      Principal
Location       Interest Rate  Maturity Date  Periodic Payment Terms                           Mortgage (1)   Mortgage    or Interest
- - ------------------------------------------------------------------------------------------------------------------------------------

                                                                                                            
Farmington, MI      11.50%      1/1/06       Principal and interest, payable monthly in           $4,156       $4,156         $--
                                             arrears.  $3.8 million due at maturity.

Howell, MI          11.50%      1/1/06       Principal and interest, payable monthly in            4,930        4,930         --
                                             arrears.  $4.5 million due at maturity.

Lyons, NE           10.30%     12/31/16      Principal and interest, payable monthly in            1,549        1,549
Milford, NE                                  arrears.  $926 due at maturity.

Ainsworth, NE       10.86%     12/31/16      Principal and interest, payable monthly in            5,109        5,109         --
Ashland, NE                                  arrears.  $3.1 million due at maturity.
Blue Hill, NE
Gretna, NE
Sutherland, NE
Waverly, NE

Ainsworth, NE       11.23%     12/31/16      Principal and interest, payable monthly in            2,035        2,035         --
Ashland, NE                                  arrears.  $1.3 million due at maturity.
Blue Hill, NE
Edgar, NE
Gretna, NE
Sutherland, NE
Waverly, NE
Lyons, NE
Milford, NE

Slidell, LA         11.00%     12/31/10      Principal and interest, payable monthly in           18,777        4,277         --
                                             arrears.  $13.9 million due at maturity.

Milwaukee, WI       13.75%      1/31/13      Interest only, payable monthly in advance.              883          883         --
                                             $883 due at maturity.
                                                                                             -------------- ------------- ----------
                                                                                                 $37,439      $22,939         $--
                                                                                             ============== ============= ==========
<FN>
(1) Also represents cost for federal income tax purposes.
</FN>



                                      S-5


                          SENIOR HOUSING PROPERTIES TRUST
                               SCHEDULE IV-continued
                           MORTGAGE LOANS ON REAL ESTATE
                                 December 31, 1999
                              (Dollars in thousands)


         Reconciliation  of  the  carrying  amount  of  mortgage  loans  at  the
beginning of the period:

         Balance at January 1, 1997                           $38,270
            New mortgage loans                                    124
            Collections of principal                             (260)
                                                       ----------------
         Balance at December 31, 1997                          38,134
            Collections of principal                             (308)
                                                       ----------------
         Balance at December 31, 1998                          37,826
            Collections of principal                             (387)
            Loan loss reserve                                 (14,500)
                                                       ----------------
         Balance at December 31, 1999                         $22,939
                                                       ================


                                      S-6


                                   SIGNATURES

         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned, thereunto duly authorized.

                                      SENIOR HOUSING PROPERTIES TRUST

                                      By: /s/ David J. Hegarty
                                          David J. Hegarty
                                          President and Chief Operating Officer
                                          Dated: March 30, 2000

         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
this  report  has  been  signed  below  by the  following  persons,  or by their
attorney-in-fact, in the capacities and on the dates indicated.



Signature                                   Title                                                Date

                                                                                           
/s/ David J. Hegarty                        President and Chief Operating Officer                March 30, 2000
David J. Hegarty


/s/ Ajay Saini                              Treasurer and Chief Financial Officer                March 30, 2000
Ajay Saini


/s/ Bruce M. Gans, M.D.                     Trustee                                              March 30, 2000
Bruce M. Gans, M.D.


/s/ Arthur G. Koumantzelis                  Trustee                                              March 30, 2000
Arthur G. Koumantzelis


/s/ John L. Harrington                      Trustee                                              March 30, 2000
John L. Harrington


/s/ Gerard M. Martin                        Trustee                                              March 30, 2000
Gerard M. Martin


/s/ Barry M. Portnoy                        Trustee                                              March 30, 2000
Barry M. Portnoy