PS BUSINESS PARKS INC/CA
10-K405, 2000-03-30
REAL ESTATE INVESTMENT TRUSTS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-K

[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 Securities Exchange
Act of 1934

For the transition period from            to
                               ----------    ----------
Commission File Number 1-10709

                             PS BUSINESS PARKS, INC.
                             -----------------------
             (Exact name of registrant as specified in its charter)

         CALIFORNIA                                    95-4300881
- --------------------------------           -----------------------------------
  (State or other Jurisdiction             (I.R.S. Employer Identification No.)
of incorporation or organization)

               701 Western Avenue, Glendale, California 91201-2397
               ---------------------------------------------------
              (Address of principal executive offices) (Zip Code)

       Registrant's telephone number, including area code: (818) 244-8080
                                                           --------------
           Securities registered pursuant to Section 12(b) of the Act

           Title of                                 Name of each exchange
          each class                                  on which register
- -----------------------------------             ----------------------------
Common Stock, $0.01 par value......               American Stock Exchange
Depositary Shares Each Representing
1/1000 of a Shares of 9 1/4
   Cumulative Preferred Stock,
   Series A, $0.01 par value........              American Stock Exchange


           Securities registered pursuant to Section 12(g) of the Act
                                      None
                                      ----
                                (Title of class)

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  the  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. [X]

The  aggregate  market value of the voting stock held by  non-affiliates  of the
registrant as of March 22, 2000:

Common Stock,  $0.01 par value,  $240,580,298  (computed on the basis of $20.375
per share which was the  reported  closing  sale price of the  Company's  Common
Stock on the American Stock Exchange on March 22, 2000).

The number of shares  outstanding of the registrant's  class of common stock, as
of March 22, 2000:

Common Stock, $0.01 par value, 23,433,061 shares.

                       DOCUMENTS INCORPORATED BY REFERENCE

Portions  of the  proxy  statement  to be filed in  connection  with the  annual
shareholders' meeting to be held in 2000 are incorporated by reference into Part
III.
<PAGE>


                                     PART I.

ITEM 1.   BUSINESS

Forward-Looking Statements
- --------------------------

         When  used  within  this  document,  the words  "expects,"  "believes,"
anticipates,"  "should,"  "estimates,"  and similar  expressions are intended to
identify "forward-looking statements" within the meaning of that term in Section
27A of the  Securities  Exchange Act of 1933, as amended,  and in Section 21F of
the Securities Exchange Act of 1934, as amended. Such forward-looking statements
involve known and unknown risks, uncertainties and other factors. Actual results
could differ  materially from those set forth in the forward-looking  statements
as a result of various factors.  Such factors include,  but are not limited to a
change in economic  conditions  in the various  markets  served by the Company's
operations  which  would  adversely  affect  the level of demand  for  rental of
commercial  space and the cost  structure  of the  Company,  general real estate
investment risks, competition, risks associated with acquisition and development
activities and debt financing,  environmental matters,  general uninsured losses
and seismic activity. Readers are cautioned not to place undue reliance on these
forward-looking statements,  which speak only as of the date hereof. The Company
undertakes  no  obligation  to publicly  release the result of any  revisions to
these  forward-looking  statements to reflect events or circumstances  after the
date hereof or to reflect the occurrence of unanticipated events.

The Company
- -----------

         PS  Business  Parks,   Inc.  (the  "Company")  is  a  self-advised  and
self-managed real estate investment trust ("REIT") that acquires, develops, owns
and operates commercial properties,  primarily multi-tenant office industrial or
"flex" space. The Company is the sole general partner of PS Business Parks, L.P.
(the  "Operating  Partnership")  through which the Company  conducts most of its
activities  and owned,  as of December 31, 1999, a 72.5%  partnership  interest.
Substantially  all of the  remaining  partnership  interest  is owned by  Public
Storage,  Inc. ("PSI") and its affiliates.  As of December 31, 1999, PSI and its
affiliates owned 27.0% of the Operating Partnership.

         In a March 17,  1998  merger (the  "Merger")  of  American  Office Park
Properties,  Inc.  ("AOPP") with and into the Company  (formerly "Public Storage
Properties XI, Inc."),  the Company  acquired the commercial  property  business
previously operated by AOPP and was renamed "PS Business Parks, Inc." Concurrent
with the Merger,  the Company  exchanged 11  mini-warehouses  and two properties
that combined  mini-warehouse and commercial space for 11 commercial  properties
owned by PSI.

         As of December  31,  1999,  the Company and the  Operating  Partnership
owned 125  commercial  properties  in 11 states  containing  approximately  12.4
million  square  feet  of  commercial  space,  representing  a 13%  increase  in
commercial  square footage  between  December 31, 1998 and December 31, 1999. In
addition,  the Operating  Partnership  manages,  on behalf of PSI and affiliated
entities, an additional 37 commercial properties  (approximately 1.0 million net
rentable square feet) at December 31, 1999.

         For financial  accounting  purposes,  the Merger was accounted for as a
reverse  acquisition  whereby AOPP was deemed to have  acquired  Public  Storage
Properties XI, Inc. However,  PS Business Parks,  Inc.  (formerly Public Storage
Properties  XI, Inc.) is the  continuing  legal entity and  registrant  for both
Securities  and Exchange  Commission  filing  purposes and income tax  reporting
purposes.

         AOPP was  originally  organized in 1986 as a California  corporation to
serve as the manager of the commercial  properties  owned by PSI and its related
entities.  In January 1997,  AOPP was  reorganized  to succeed to the commercial
property  business  of  PSI,  becoming  a  fully  integrated,  self-advised  and
self-managed REIT. AOPP conducted  substantially all of its business as the sole
general partner of the Operating Partnership.

         In January 1997, as part of a reorganization,  PSI and its consolidated
partnerships  transferred  35  commercial  properties  to AOPP and the Operating
Partnership.  During April 1997,  PSI  transferred  four  additional  commercial
properties to the  Operating  Partnership.  During the  remainder of 1997,  AOPP
acquired  six  properties  containing  approximately  2 million  square  feet of
commercial   space    from    the     Acquiport    Corporations,    subsidiaries


                                      2
<PAGE>

of the New York State Common  Retirement  Fund, and four  properties  containing
approximately  0.6  million  square  feet of  commercial  space from other third
parties.  At December  31, 1997,  AOPP and the  Operating  Partnership  owned 49
properties  located in 10 states.  The  Operating  Partnership  also  managed an
additional 49 properties owned by PSI and its related entities (including the 13
properties  acquired in the Merger). As of December 31, 1997, AOPP owned a 35.4%
partnership interest in the Operating Partnership.  The balance of the Operating
Partnership was owned by PSI, its  consolidated  partnerships  and certain third
parties.

         During   1998,   the  Company   completed   the  Merger  and   acquired
approximately 4.9 million square feet of commercial space, including 2.3 million
square  feet of space  located in Oregon and Texas from  Principal  Mutual  Life
Insurance  Company in May 1998 and 1.8 million  square feet of commercial  space
located in  California,  Maryland,  Virginia  and Texas from other  unaffiliated
third parties.

         During 1999, the Company acquired approximately 1.3 million square feet
from  unaffiliated  third parties and completed  development  on two  properties
totaling  127,000  square  feet.  These  additions  continued  to  increase  the
Company's  presence in existing  markets,  which the Company  believes  have the
characteristics  necessary for long-term  growth.  The Company  acquired 483,000
square feet in Texas, 405,000 square feet in Northern Virginia/Maryland, 211,000
square feet in Northern California and 200,000 square feet in Arizona.

         The  Company  has  elected  to be taxed as a REIT  under  the  Internal
Revenue Code (the "Code"),  commencing  with its taxable year ended December 31,
1990. To the extent that the Company continues to qualify as a REIT, it will not
be taxed, with certain limited exceptions, on the net income that is distributed
currently to its shareholders.

         The Company's  principal  executive  offices are located at 701 Western
Avenue, Glendale, California 91201-2397. Its telephone number is (818) 244-8080.

         The  commercial  properties  owned  by the  Company  and the  Operating
Partnership  generally  include both business park  (industrial/flex  space) and
office  space.  The  industrial  space is used for,  among other  things,  light
manufacturing and assembly,  storage and warehousing,  distribution and research
and development activities. Tenants who are renting industrial space also occupy
most of the office space. The commercial  properties typically consist of one to
ten  one-story  buildings  located  on  three  to  20  acres  and  contain  from
approximately  10,000 to 500,000 square feet of rentable space (more than 50,000
square feet in the case of the freestanding properties). A property is typically
divided  into  units  ranging  in size from 500 to 10,000  square  feet.  Leases
generally  range from one to ten years and some  tenants  have options to extend
the  original  terms of their  leases.  Facilities  are managed  through  either
on-site management or area offices central to the facilities. Parking is open or
covered.  The ratio of parking spaces to rentable square feet ranges from two to
six per  thousand  square feet  depending  upon the use of the  property and its
location.  Office space  generally  requires a greater  parking  ratio than most
industrial  uses.  The  Company may  acquire  properties  that do not have these
characteristics.

         The  Company  intends  to  continue  to acquire  commercial  properties
located  throughout  the  United  States.  The  Company's  policy  of  acquiring
commercial  properties  may  be  changed  by  its  Board  of  Directors  without
shareholder approval. However, the Board of Directors has no intention to change
this policy at this time.  Although the Company currently operates properties in
13 states, it may expand its operations to other states. Properties are acquired
both for income and potential  capital  appreciation;  there is no limitation on
the amount that can be invested in any specific  property.  Although there is no
limitation  on mortgage  debt,  the Company  has no current  intention  to incur
significant debt (other than short-term  borrowings from time to time (including
from  PSI)  to  fund  acquisitions).  The  Company  may  acquire  land  for  the
development of commercial properties.  In general, the Company will acquire land
that is adjacent to existing  commercial  properties that the Company owns or is
acquiring.  The  Company  currently  has six  facilities  in  various  stages of
development.

                                       3
<PAGE>
Operating Partnership
- ---------------------

         The  properties in which the Company has an equity  interest  generally
will be owned by the Operating  Partnership.  This structure enables the Company
to acquire  interests in additional  properties in transactions that could defer
the  contributors'  tax  consequences.  This  structure also enabled PSI and its
consolidated  partnerships  to contribute  interests in their  properties and to
defer  until a later date the tax  liabilities  that they  otherwise  would have
incurred if they had received Common Stock.

         As the general  partner of the Operating  Partnership,  the Company has
the  exclusive  power under the  Operating  Partnership  Agreement to manage and
conduct  the  business  of the  Operating  Partnership.  The Board of  Directors
directs the affairs of the  Operating  Partnership  by  managing  the  Company's
affairs.  The Operating  Partnership  will be responsible for, and pay when due,
its share of all administrative and operating expenses of the properties it owns
under the terms of a cost sharing and administrative  services agreement with an
affiliate of PSI. See "Cost Allocation and Administrative Services."

         The  Company's  interest in the  Operating  Partnership  entitles it to
share in cash  distributions  from, and the profits and losses of, the Operating
Partnership  in proportion to the Company's  economic  interest in the Operating
Partnership  (apart  from tax  allocations  of  profits  and losses to take into
account pre-contribution property appreciation or depreciation).

Summary of the Operating Partnership Agreement
- ----------------------------------------------

         The  following  summary  of  the  Operating  Partnership  Agreement  is
qualified in its entirety by reference to the Operating  Partnership  Agreement,
which has been filed as an exhibit with the Securities and Exchange Commission.

         Issuance of Additional Partnership Interests: As the general partner of
the  Operating  Partnership,  the Company is  authorized  to cause the Operating
Partnership from time to time to issue to partners of the Operating  Partnership
or to other persons additional  partnership units in one or more classes, and in
one or more series of any of such classes,  with such designations,  preferences
and  relative,  participating,  optional,  or other special  rights,  powers and
duties  (which  may be senior to the  existing  partnership  units),  as will be
determined  by the  Company,  in its  sole  and  absolute  discretion.  No  such
additional  partnership units, however, will be issued to the Company unless (i)
the agreement to issue the additional partnership interests arises in connection
with the  issuance of shares of the  Company,  which  shares have  designations,
preferences and other rights, such that the economic interests are substantially
similar to the  designations,  preferences  and other  rights of the  additional
partnership  units  that  would be issued to the  Company  and (ii) the  Company
agrees to make a capital contribution to the Operating  Partnership in an amount
equal to the proceeds  raised in connection  with the issuance of such shares of
the Company.

         Capital  Contributions:  No  partner  is  required  to make  additional
capital  contributions to the Operating  Partnership,  except the Company as the
general partner is required to contribute the net proceeds of the sale of equity
interests in the Company to the Operating Partnership.  A limited partner may be
required to pay to the  Operating  Partnership  any taxes paid by the  Operating
Partnership on behalf of that limited partner.  No partner is required to pay to
the Operating  Partnership any deficit or negative  balance,  which may exist in
its capital account.

     Distributions:  The Company,  as general partner, is required to distribute
at least quarterly the "available cash" (as defined in the Operating Partnership
Agreement)   generated  by  the   Operating   Partnership   for  such   quarter.
Distributions are to be made (i) first, with respect to any class of partnership
interests having a preference over other classes of partnership  interests;  and
(ii) second, in accordance with the partners' respective percentage interests on
the  "partnership  record  date"  (as  defined  in  the  Operating   Partnership
Agreement).  Commencing in 1998, the Operating  Partnership's  policy is to make
distributions  per unit (other than  preferred  units) that are equal to the per
share distributions made by the Company with respect to its Common Stock, and in
any  case  the per  unit  and per  share  distributions  will  be  equal  during
partnership year 2000.

     Preferred  Units:  As of December 31, 1999, the Operating  Partnership  had
5,310,000  preferred units  outstanding with  distribution  rates ranging from 8
3/4% to 8 7/8%. The Operating  Partnership has the right to redeem the preferred
units on or after the fifth  anniversary  of the  issuance  date at the original
capital  contribution plus the cumulative  priority return,  as defined,  to the
redemption  date to the extent not previously  distributed.  The preferred units
are  exchangable  for Cumulative  Redeemable  Preferred  Stock of the respective
series of PS Business Parks,  Inc. on or after the tenth anniversary of the date
of  issuance  at the option of the  Operating  Partnership  or  majority  of the
holders of the preferred units.

                                       4
<PAGE>

     Redemption  of  Partnership  Interests:   Subject  to  certain  limitations
described  below,  each limited partner other than the Redemption of Partnership
Interests:  Subject to certain limitations described below, each limited partner
other than the Company has the right to require the  redemption  of such limited
partner's  unit  (other  than  holders of  preferred  units).  This right may be
exercised on at least 10 days notice at any time or from time to time, beginning
on the date that is one year  after the date on which  such  limited  partner is
admitted to the Operating Partnership (unless otherwise  contractually agreed by
the general partner).

         Unless the Company,  as general  partner,  elects to assume and perform
the Operating  Partnership's  obligation with respect to a redemption  right, as
described  below, a limited  partner that  exercises its  redemption  right will
receive  cash  from  the  Operating  Partnership  in  an  amount  equal  to  the
"redemption amount" (as defined in the Operating Partnership Agreement generally
to reflect the average  trading  price of the Common Stock of the Company over a
specified  10 day  period)  for the  units  redeemed.  In lieu of the  Operating
Partnership redeeming the partner for cash, the Company, as the general partner,
has the right to elect to  acquire  the units  directly  from a limited  partner
exercising its redemption  right,  in exchange for cash in the amount  specified
above as the  "redemption  amount" or by  issuance  of the  "shares  amount" (as
defined in the Operating Partnership Agreement generally to mean the issuance of
one share of the  Company  Common  Stock for each  unit of  limited  partnership
interest redeemed).

         A limited partner cannot  exercise its redemption  right if delivery of
shares of Common  Stock would be  prohibited  under the  applicable  articles of
incorporation  or if the  general  partner  believes  that  there is a risk that
delivery of shares of Common Stock would cause the general  partner to no longer
qualify as a REIT,  would  cause a violation  of the  applicable  securities  or
certain  antitrust laws, or would result in the Operating  Partnership no longer
being treated as a partnership for federal income tax purposes.

         Management:  The  Operating  Partnership  is  organized as a California
limited  partnership.  The Company, as the sole general partner of the Operating
Partnership has full,  exclusive and complete  responsibility  and discretion in
managing and  controlling the Operating  Partnership,  except as provided in the
Operating  Partnership  Agreement and by applicable law. The limited partners of
the  Operating  Partnership  have no  authority  to  transact  business  for, or
participate  in  the  management  activities  or  decisions  of,  the  Operating
Partnership  except as provided in the  Operating  Partnership  Agreement and as
permitted  by  applicable  law.  However,  the consent of the  limited  partners
holding a majority of the interests of the limited partners  (including  limited
partnership  interests held by the Company)  generally will be required to amend
the  Operating  Partnership   Agreement.   Further,  the  Operating  Partnership
Agreement  cannot be  amended  without  the  consent of each  partner  adversely
affected if, among other things,  the amendment would alter the partner's rights
to  distributions  from  the  Operating   Partnership  (except  as  specifically
permitted in the Operating Partnership  Agreement),  alter the redemption right,
or impose on the  limited  partners an  obligation  to make  additional  capital
contributions.  The consent of all limited partners will be required to (i) take
any action that would make it  impossible  to carry on the ordinary  business of
the  Operating  Partnership,  except  as  otherwise  provided  in the  Operating
Partnership Agreement; or (ii) possess Operating Partnership property, or assign
any  rights in  specific  Operating  Partnership  property,  for  other  than an
Operating  Partnership  purpose  except as otherwise  provided in the  Operating
Partnership  Agreement.  In  addition,  without  the  consent  of any  adversely
affected limited partner, the general partner may not perform any act that would
subject a limited partner to liability as a general partner in any  jurisdiction
or any other liability except as provided in the Operating Partnership Agreement
or under California law.

         Extraordinary   Transactions:   The  Operating   Partnership  Agreement
provides that the Company may not engage in any business combination, defined to
mean any merger,  consolidation or other combination with or into another person
or sale of all or substantially  all of its assets,  any  reclassification,  any
recapitalization  (other than certain stock splits or stock dividends) or change
of outstanding  shares of common stock,  unless (i) the limited  partners of the
Operating Partnership will receive, or have the opportunity to receive, the same
proportionate  consideration  per unit in the transaction as shareholders of the
Company (without regard to tax considerations);  or (ii) limited partners of the
Operating  Partnership  (other than the general partner) holding at least 60% of
the interests in the Operating  Partnership held by limited partners (other than
the general partner) vote to approve the business combination.  In addition, the
Company,  as general  partner of the  Operating  Partnership,  has agreed in the
Operating  Partnership  Agreement  with the limited  partners  of the  Operating
Partnership  that it will not  consummate  a business  combination  in which the
Company conducted a vote of shareholders  unless the matter is also submitted to
a vote of the  partners.  The foregoing  provision of the Operating  Partnership
Agreement would under no  circumstances  enable or require the Company to engage
in    a    business     combination     which    required    the   approval   of

                                       5
<PAGE>

shareholders  if the  shareholders  of the  Company  did  not in fact  give  the
requisite  approval.   Rather,  if  the  shareholders  did  approve  a  business
combination, the Company would not consummate the transaction unless the Company
as  general  partner  first  conducts  a  vote  of  partners  of  the  Operating
Partnership on the matter.  For purposes of the Operating  Partnership vote, the
Company shall be deemed to vote its partnership  interest in the same proportion
as  the   shareholders  of  the  Company  voted  on  the  matter   (disregarding
shareholders  who do not vote).  The Operating  Partnership  vote will be deemed
approved if the votes recorded are such that if the Operating  Partnership  vote
had been a vote of  shareholders,  the  business  combination  would  have  been
approved by the  shareholders.  As a result of these provisions of the Operating
Partnership,  a third party may be inhibited from making an acquisition proposal
that it would  otherwise  make,  or the Company,  despite  having the  requisite
authority under its articles of  incorporation,  may not be authorized to engage
in a proposed business combination.

         Tax Protection Provisions: The Operating Partnership Agreement provides
that,  until 2007, the Operating  Partnership  may not sell any of 13 designated
properties in a transaction  that will produce taxable gain for the contributing
partner without the prior written  consent of PSI. The Operating  Partnership is
not required to obtain PSI's consent if PSI and its affiliated  partnerships  do
not  continue  to hold at the time of the sale at  least  30% of their  original
interest in the Operating  Partnership.  Since PSI's consent is required only in
connection  with a  taxable  sale of one of the 13  designated  properties,  the
Operating Partnership will not be required to obtain PSI's consent in connection
with a "like-kind"  exchange or other  nontaxable  transaction  involving one of
these properties.

         Indemnification:  The Operating Partnership Agreement provides that the
Company and its officers and directors will be indemnified  and held harmless by
the  Operating  Partnership  for any act  performed  for,  or on behalf  of, the
Operating Partnership, or in furtherance of the Operating Partnership's business
unless it is established that (i) the act or omission of the indemnified  person
was  material  to the  matter  giving  rise to the  proceeding  and  either  was
committed  in bad faith or was the result of active and  deliberate  dishonesty;
(ii) the indemnified  person actually  received an improper  personal benefit in
money,  property or services;  or (iii) in the case of any criminal  proceeding,
the indemnified  person had reasonable cause to believe that the act or omission
was unlawful. The termination of any proceeding by judgment, order or settlement
does not  create a  presumption  that the  indemnified  person  did not meet the
requisite  standards  of  conduct  set  forth  above.  The  termination  of  any
proceeding by conviction or upon a plea of nolo contendere or its equivalent, or
an entry of an order of  probation  prior  to  judgment,  creates  a  rebuttable
presumption that the indemnified  person did not meet the requisite  standard of
conduct set forth above. Any  indemnification  so made shall be made only out of
the assets of the Operating Partnership.

         Duties and  Conflicts:  The Operating  Agreement  allows the Company to
operate the  Operating  Partnership  in a manner that will enable the Company to
satisfy the  requirements for being classified as a REIT. The Company intends to
conduct all of its business activities,  including all activities  pertaining to
the acquisition,  management and operation of properties,  through the Operating
Partnership.  However,  the Company may own,  directly or through  subsidiaries,
interest  in  Operating  Partnership  properties  that do not  exceed  1% of the
economic  interest of any property,  and if appropriate for  regulatory,  tax or
other  purposes,  the Company  also may own,  directly or through  subsidiaries,
interests in assets that the Operating  Partnership  otherwise could acquire, if
the Company grants to the Operating Partnership the option to acquire the assets
within a  period  not to  exceed  three  years in  exchange  for the  number  of
partnership units that would be issued if the Operating Partnership had acquired
the assets at the time of acquisition by the Company.

         Term: The Operating  Partnership will continue in full force and effect
until  December 31, 2096 or until sooner  dissolved  upon the  withdrawal of the
general  partner  (unless the limited  partners  elect to continue the Operating
Partnership), or by the election of the general partner (with the consent of the
holders of a majority of the partnerships  interests if such vote is held before
January 1, 2056), in connection with a merger,  by the sale or other disposition
of all or substantially  all of the assets of the Operating  Partnership,  or by
judicial decree.

                                       6
<PAGE>

Cost Allocation and Administrative Services
- -------------------------------------------

         Pursuant to a cost sharing and administrative services agreement, PSCC,
Inc.  ("PSCC") has been formed to serve as a  cooperative  cost  allocation  and
administrative services clearing house that performs centralized  administrative
services for the Company,  PSI and other property  owners  affiliated  with PSI.
These services include accounting and finance,  employee  relations,  management
information  systems,  legal,  office services,  marketing,  administration  and
property  management  training.  In addition,  to take advantage of economies of
scale, PSCC purchases supplies and services for the benefit of multiple property
owners and allocates  the costs of these  supplies and services to the benefited
property owners and employs and  administers the payroll for employees  required
for the  operation  of the  properties  and the  ownership  entities.  As to the
Company, this agreement is not terminable until January 2002. The Company has no
intention to  terminate  this  agreement.  The  Company,  PSI and certain  other
property owners own the capital stock of PSCC.  Since the Company owns less than
10% of the capital  stock of PSCC,  the Company does not control the  operations
and  activities  of PSCC.  Under this  agreement,  PSCC  allocates  costs to the
Company in  accordance  with a methodology  that is intended to fairly  allocate
charges among participating entities.

Common Officers and Directors
- -----------------------------

         Harvey Lenkin,  the President of PSI, is a Director of both the Company
and PSI. Ronald L. Havner,  Jr., the Chairman and Chief Executive Officer of the
Company,  was Senior Vice  President  and Chief  Financial  Officer of PSI until
December  1996  and is  currently  an  employee  of  PSI.  The  Company  engages
additional  executive personnel who render services exclusively for the Company.
However,  it is expected that  officers of PSI will continue to render  services
for the Company as requested.

Management Agreement
- --------------------

         The Company continues to manage commercial  properties owned by PSI and
its affiliates, which are generally adjacent to mini-warehouses, for a fee of 5%
of the gross revenues of such properties in addition to  reimbursement of direct
costs. The property  management  contract with PSI is for a seven-year term with
the term extended one year each anniversary.  The property management  contracts
with affiliates of PSI are cancelable by either party upon sixty days notice.

Management
- ----------

         Ronald L. Havner,  Jr. (42),  President,  Chairman and Chief  Executive
Officer,  heads the  Company's  senior  management  team.  Mr.  Havner  has been
President  and Chief  Executive  Officer of the  Company or AOPP since  December
1996.  He became  Chairman  of the  Company in March  1998.  He was Senior  Vice
President and Chief Financial  Officer of PSI from 1992 until December 1996. The
Company's executive management includes:  Jack Corrigan (39), Vice President and
Chief Financial Officer and Michael Lynch (47), Vice  President-Acquisitions and
Development.

REIT Structure
- --------------

         If certain  detailed  conditions  imposed  by the Code and the  related
Treasury  Regulations are met, an entity,  such as PS Business Parks, Inc., that
invests  principally  in real  estate  and  that  otherwise  would be taxed as a
corporation may elect to be treated as a REIT. The most important consequence to
PS  Business  Parks,  Inc.  of being  treated as a REIT for  federal  income tax
purposes  is that this  enables  PS  Business  Parks,  Inc.  to deduct  dividend
distributions  to its  shareholders,  thus  effectively  eliminating the "double
taxation" (at the corporate and shareholder  levels) that typically results when
a corporation  earns income and  distributes  that income to shareholders in the
form of dividends.


                                       7
<PAGE>

Investment Objective - Growth in Funds from Operations per Share
- ----------------------------------------------------------------

         The Company's  primary  objective is to maximize  shareholder  value by
achieving  long term  growth in funds from  operations  per share.  The  Company
intends to continue achieving this objective through internal growth of existing
facilities combined with acquisitions of quality commercial properties in growth
markets and submarkets.  The Company intends to continue investing in properties
and markets that have characteristics which enable them to be competitive in the
short and long term.  The Company seeks  markets with above  average  population
growth,  education levels and personal income. In addition,  the Company targets
properties in those markets where it believes  supply is  constrained  and where
properties  are  close to  important  services  and have  easy  access  to major
transportation arteries.

         The  Company  attempts  to  limit  the  risk in its  portfolio  through
attracting a  diversified  tenant base,  both in size and  industry  focus.  The
Company's  focus is on properties with easily  reconfigured  space and therefore
appeals to a wide range of potential  tenants.  Such property  flexibility  also
allows the  Company to better  serve  existing  tenants by  accommodating  their
inevitable   expansion  and  contraction  needs.  In  addition,   the  Company's
experience is that such property  flexibility  helps it maintain high  occupancy
rates including periods when market conditions are less favorable.

         By focusing on  properties  with easily  reconfigured  space and a wide
range of tenants, the Company seeks to control capital  expenditures  associated
with  re-leasing  space.  The Company also attempts to limit tenant  improvement
expenditures to those that are appropriate for a high number of users.

         The Company seeks to provide a superior level of service to its tenants
in order to achieve high  occupancy and rental  rates,  as well as low turnover.
The  Company's  property  management  offices  are  primarily  located  on-site,
providing  tenants with convenient  access to management.  On-site staff enables
the Company's properties to be well maintained and to convey a sense of quality,
order  and  security.  The  Company  has  significant  experience  in  acquiring
properties  managed  by others and  thereafter  improving  tenant  satisfaction,
occupancy levels,  renewal rates and rental income by implementing the Company's
tenant service programs.

Competition
- -----------

         Significant Competition among Commercial Properties: Competition in the
market  areas  in  which  many  of  the  Company's  properties  are  located  is
significant  and has  reduced  the  occupancy  levels and  rental  rates of, and
increased the operating  expenses of, certain of these  properties.  Competition
may be  accelerated by any increase in  availability  of funds for investment in
real estate.  Barriers to entry are  relatively low for those with the necessary
capital and the Company will be competing for property  acquisitions and tenants
with entities that have greater  financial  resources  than the Company.  Recent
increases  in  development  of  commercial  properties  are  expected to further
intensify  competition  among  operators  in certain  market  areas in which the
Company operates.

         The Company  believes  that the  significant  operating  and  financial
experience of its executive  officers and directors  combined with the Company's
capital structure, national investment scope, geographic diversity and economies
of scale should enable the Company to continue to compete effectively with other
entities.

Business Attributes
- -------------------

         The   Company    believes   it   possesses    several    distinguishing
characteristics  that enable it to compete effectively in the  Office/Warehouse,
"flex" space  industry.  The Company's  facilities  are part of a  comprehensive
system  encompassing   standardized  procedures  and  integrated  reporting  and
information  networks.  The Company  believes it possesses the most  experienced
property  operations group within this industry.  The Company has a strong track
record of growing  revenues and net operating  income for the  properties it has
operated for at least eight years. The Company is diversified geographically and
by tenant.  In  addition,  the  Company  has a  consistent  record of  acquiring
properties in selected markets at prices believed to be below  replacement costs
and which enables the Company to execute its growth strategies.


                                       8
<PAGE>


         Financially,   the   Company   has   adopted  a   conservative   policy
characterized  by a low payout ratio and minimal debt levels.  These  attributes
are complemented by sponsorship from PSI, a widely known and respected REIT.

Growth Strategies
- -----------------

         The  Company's  growth  strategies  focus on  improving  the  operating
performance  of its  existing  properties  and on  increasing  its  ownership of
"flex-space" facilities through additional investments.  Major elements of these
strategies are as follows:

         Increase  Net Cash Flow of Existing  Properties:  The Company  seeks to
increase  the  net  cash  flow  generated  by  its  existing  properties  by (i)
increasing  average occupancy rates and (ii) achieving higher levels of realized
monthly rents per occupied  square foot and (iii)  reducing its  operating  cost
structure by  improving  operating  efficiencies  and  economies  of scale.  The
Company believes that its proactive  property  management  personnel and systems
combined with strong markets and increasing  economies of scale will enhance the
Company's ability to meet these goals.

         Acquire  Properties  Owned or Operated by Others:  The Company believes
its presence in and  knowledge  of its markets  enhances its ability to identify
attractive acquisition opportunities and capitalize on the overall fragmentation
in the "flex" space industry.  The Company maintains local market information on
rates,  occupancies and competition in each of the markets in which it operates.
The Company believes that the ten largest  operators manage less than 15% of the
total space of the 900 million  square feet of "flex"  space  facilities  in the
United States as noted by Torto Wheaton  Research.  Similar to 1999, the Company
expects third party  acquisitions to be its most significant  growth area during
fiscal 2000, if attractive investment opportunities continue to be available.

         Develop  Properties  in Existing  Markets:  The  Company's  development
strategy is to selectively  construct new properties  next to existing  business
parks.  The  properties  are  being  developed  using  the  expertise  of  local
development  companies.  The Company plans to keep development  activities below
10% of its portfolio.

Financing of the Company's Growth Strategies
- --------------------------------------------

         Retain  Operating  Cash Flow:  The Company seeks to retain  significant
funds (after funding its distributions and capital  improvements) for additional
investments  and debt  reduction.  During the year ended  December 31, 1999, the
Company distributed 41% of its funds from operations ("FFO") allocable to common
stock and retained  $38.1 million which was available for principal  payments on
debt and reinvestment into real estate assets. See "Management's  Discussion and
Analysis of Financial Condition and Results of Operations-Liquidity  and Capital
Resources."

         Revolving Line of Credit:  The Company  currently has an unsecured $100
million  ("Credit  Facility") with Wells Fargo Bank, which the Company uses as a
temporary  source of  acquisition  financing.  The Company  seeks to  ultimately
finance all  acquisitions  with permanent  capital to eliminate  refinancing and
interest rate risk.

         Access to  Acquisition  Capital:  The Company  believes that its strong
financial  position enables it to access capital to finance its growth. In 1998,
the  Company  issued  approximately  $322  million  of common  equity and common
operating  partnership units to finance its  acquisitions.  In 1999, the Company
issued  approximately  $188 million of preferred equity and preferred  operating
partnership  units to finance its  acquisitions.  The Company targets a leverage
ratio of 40% (defined as debt and  preferred  equity as a  percentage  of market
capitalization).  In  addition,  the Company  targets a ratio of FFO to combined
fixed charges and preferred  distributions  of 3.0 to 1.0. Fixed charges include
interest  expense and  capitalized  interest.  Preferred  distributions  include
amounts paid to preferred  shareholders  and  preferred  OP  unitholders.  As of
December 31, 1999 and for the year then ended,  the  leverage  ratio was 24% and
the FFO to combined fixed charges and preferred  distributions  ratio was 7.4 to
1.0.  The  Company  plans to add  leverage to its  capital  structure  primarily
through  the use of  preferred  stock,  but may assume debt in  connection  with
acquisitions. This policy is subject to change depending upon market conditions.


                                       9
<PAGE>


Investments in Real Estate Facilities
- -------------------------------------

         As of  December  31,  1999,  the Company had a total of 125 real estate
facilities  (12.4 million  square feet)  compared to 106 real estate  facilities
(10.9 million  square feet) at December 31, 1998.  The increase in the number of
facilities was due to the  acquisitions  of facilities from  unaffiliated  third
parties and the development of two properties.

Restrictions on Transactions with Affiliates
- --------------------------------------------

         The   Company's   Bylaws   provide  that  the  Company  may  engage  in
transactions  with affiliates  provided that a purchase or sale transaction with
an  affiliate  is  (i)  approved  by a  majority  of the  Company's  independent
directors  and (ii) fair to the Company  based on an  independent  appraisal  or
fairness opinion.

Borrowings
- ----------

         In August 1999, the Company  extended its unsecured line of credit with
Wells Fargo Bank. The Credit  Facility has a borrowing limit of $100 million and
an expiration date of August 6, 2002. The expiration date may be extended by one
year on  each  anniversary  of the  Credit  Facility.  Interest  on  outstanding
borrowings  is  payable  monthly.  At the  option  of the  Company,  the rate of
interest  charged is equal to (i) the prime rate or (ii) a rate ranging from the
London  Interbank  Offered Rate ("LIBOR")  plus 0.75% to 1.35%  depending on the
Company's  credit rating and coverage ratios,  as defined  (currently LIBOR plus
1.00%). In addition,  the Company is required to pay an annual commitment fee of
0.25%.

         Under covenants of the Credit Facility,  the Company is required to (i)
maintain a balance sheet  leverage ratio (as defined) of less than 0.50 to 1.00,
(ii) maintain interest and fixed charge coverage ratios (as defined) of not less
than 2.25 to 1.0 and 1.75 to 1.0,  respectively,  (iii) maintain a minimum total
shareholder's  equity (as defined) and (iv) limit  distributions to 95% of funds
from  operations.  In  addition,  the Company is limited in its ability to incur
additional  borrowings (the Company is required to maintain  unencumbered assets
with an aggregate  book value equal to or greater  than two times the  Company's
unsecured  recourse debt) or sell assets. The Company was in compliance with the
covenants of the Credit Facility at December 31, 1999.

         As of December 31, 1999,  the Company had  outstanding  mortgage  notes
payable balances of approximately $37 million and no balance  outstanding on the
Credit Facility.  See Notes 6 and 7 to the consolidated financial statements for
a summary of the Company's borrowings at December 31, 1999.

         The Company has broad powers to borrow in  furtherance of the Company's
objectives.  The Company has incurred in the past,  and may incur in the future,
both  short-term and long-term  indebtedness to increase its funds available for
investment in real estate, capital expenditures and distributions.

Employees
- ---------

         As  of  December  31,  1999,  the  Company  employed  105  individuals,
primarily  personnel engaged in property  operations.  The Company believes that
its  relationship  with its  employees  is good and  none of the  employees  are
represented by a labor union.

Federal Income Tax
- ------------------

         The Company  believes that it has operated,  and intends to continue to
operate,  in such a manner  as to  qualify  as a REIT  under  the  Code,  but no
assurance can be given that it will at all times so qualify.  To the extent that
the Company  continues to qualify as a REIT, it will not be taxed,  with certain
limited   exceptions,   on  the  taxable  income  that  is  distributed  to  its
shareholders.


                                       10
<PAGE>


Insurance
- ---------

         The  Company  believes  that its  properties  are  adequately  insured.
Facilities  operated  by the Company  have  historically  carried  comprehensive
insurance,  including  fire,  earthquake,  liability and extended  coverage from
nationally recognized carriers.

Impact of Year 2000
- -------------------

         See  "Management's  Discussion and Analysis of Financial  Condition and
Results of Operations-Impact of Year 2000."


                                       11
<PAGE>


ITEM 2.   PROPERTIES

         As of December 31, 1999, the Company owned  approximately  11.0 million
square  feet of "flex"  space and 1.4 million  square  feet of  suburban  office
concentrated  primarily in seven major markets  including  Southern and Northern
California,  Southern and Northern Texas,  Virginia,  Maryland,  and Oregon. The
weighted average occupancy rate as of December 31, 1999 was 96.2%.

         The following table contains  information about properties owned by the
Company and the Operating Partnership as of December 31, 1999:


<TABLE>
<CAPTION>

                                                         Rentable Square Footage
                                         -----------------------------------------------------------
                            Number of                                                                          Occupancy at
          City              Properties         Flex                Office               Total               December 31, 1999
- --------------------------------------------------------------------------------------------------------------------------------
<S>                         <C>                <C>                 <C>                  <C>                 <C>

Arkansas
Little Rock...........          1              91,064                    -               91,064                    90.3%
                           -----------------------------------------------------------------------------------------------------
                                1              91,064                    -               91,064                    90.3%
                           -----------------------------------------------------------------------------------------------------

Arizona
Mesa..................          1              78,038                    -               78,038                   100.0%
Phoenix...............          1             199,581                    -              199,581                    98.4%
Tempe.................          3             291,264                    -              291,264                    98.2%
                           -----------------------------------------------------------------------------------------------------
                                5             568,883                    -              568,883                    98.5%
                           -----------------------------------------------------------------------------------------------------

Northern California
Hayward...............          1             406,712                    -              406,712                   100.0%
Monterey..............          1                   -               12,003               12,003                    96.5%
Sacramento............          2             364,507                    -              364,507                    88.1%
San Jose..............          2             387,631                    -              387,631                    97.6%
San Ramon.............          2                   -               52,149               52,149                   100.0%
So. San Francisco.....          2              93,775                    -               93,775                   100.0%
                           -----------------------------------------------------------------------------------------------------
                                10          1,252,625               64,152            1,316,777                    96.0%
                           -----------------------------------------------------------------------------------------------------

Southern California
Buena Park............          1             317,312                    -              317,312                   100.0%
Carson................          1              77,255                    -               77,255                    96.3%
Cerritos..............          2             394,610               31,270              425,880                    96.5%
Culver City...........          1             146,402                    -              146,402                    99.0%
Laguna Hills..........          2             613,947                    -              613,947                   100.0%
Lake Forest...........          1             296,597                    -              296,597                    98.4%
Lakewood..............          1                   -               56,902               56,902                    94.5%
Monterey Park.........          1             199,056                    -              199,056                    91.4%
San Diego.............          7             377,880              232,808              610,688                    98.6%
Signal Hill...........          2             178,146                    -              178,146                    96.1%
Studio City...........          1              22,092                    -               22,092                   100.0%
Torrance..............          2             147,220                    -              147,220                    97.2%
                           -----------------------------------------------------------------------------------------------------
                                22          2,770,517              320,980            3,091,497                    97.9%
                           -----------------------------------------------------------------------------------------------------

Kansas
Overland Park.........          1              61,836                    -               61,836                    89.9%
                           -----------------------------------------------------------------------------------------------------
                                1              61,836                    -               61,836                    89.9%
                           -----------------------------------------------------------------------------------------------------

</TABLE>


                                       12
<PAGE>

<TABLE>
<CAPTION>

                                                          Rentable Square Footage
                                         -----------------------------------------------------------
                            Number of                                                                         Occupancy at
          City              Properties         Flex                Office               Total               December 31, 1999
- --------------------------------------------------------------------------------------------------------------------------------
<S>                         <C>                <C>                 <C>                  <C>                 <C>

Maryland
Baltimore (1).........          1                   -              237,638              237,638                    97.7%
Beltsville............          1             307,791                    -              307,791                   100.0%
Gaithersburg..........          1                   -               28,994               28,994                    96.5%
Landover (2)..........          2             379,471                    -              379,471                   100.0%
Largo.................          1             149,918                    -              149,918                   100.0%
                           -----------------------------------------------------------------------------------------------------
                                6             837,180              266,632            1,103,812                    99.4%
                           -----------------------------------------------------------------------------------------------------

Oklahoma
Broken Arrow..........          1              87,895                    -               87,895                    92.1%
Tulsa.................          1              56,566                    -               56,566                    86.4%
                           -----------------------------------------------------------------------------------------------------
                                2             144,461                    -              144,461                    89.9%
                           -----------------------------------------------------------------------------------------------------

Oregon
Beaverton.............          15            880,186              186,770            1,066,956                    98.6%
Milwaukee.............          2             101,578                    -              101,578                    93.3%
                           -----------------------------------------------------------------------------------------------------
                                17            981,764              186,770            1,168,534                    98.1%
                           -----------------------------------------------------------------------------------------------------

Tennessee
Nashville.............          2             138,004                    -              138,004                    95.5%
                           -----------------------------------------------------------------------------------------------------
                                2             138,004                    -              138,004                    95.5%
                           -----------------------------------------------------------------------------------------------------

Texas
Austin................          15            831,404                    -              831,404                    94.6%
Dallas................          2             236,997                    -              236,997                    98.9%
Garland...............          1              36,458                    -               36,458                   100.0%
Houston...............          2             176,977              131,214              308,191                    79.7%
Las Colinas (1).......          12            843,112                    -              843,112                    91.9%
Mesquite..............          1              56,541                    -               56,541                    93.3%
Missouri City.........          1              66,000                    -               66,000                   100.0%
Pasadena..............          1             154,000                    -              154,000                    99.2%
Plano.................          1             184,809                    -              184,809                   100.0%
Richardson............          2             116,800                    -              116,800                    95.1%
San Antonio...........          2                   -              199,269              199,269                    82.1%
                           -----------------------------------------------------------------------------------------------------
                                40          2,703,098              330,483            3,033,581                    92.6%
                           -----------------------------------------------------------------------------------------------------

Virginia
Alexandria............          3             154,782               53,737              208,519                    97.9%
Chantilly (2).........          5             315,080               38,502              353,582                    94.0%
Herndon (2)...........          2             193,623               50,750              244,373                    99.1%
Lorton................          1             246,520                    -              246,520                    94.6%
Springfield...........          2              59,756               90,374              150,130                    97.5%
Sterling (2)..........          4             295,625                    -              295,625                   100.0%
Woodbridge............          1             113,629                    -              113,629                    96.8%
                           -----------------------------------------------------------------------------------------------------
                                18          1,379,015              233,363            1,612,378                    97.0%
                           -----------------------------------------------------------------------------------------------------

Washington
Renton................          1              27,912                    -               27,912                   100.0%
                           -----------------------------------------------------------------------------------------------------
                                1              27,912                    -               27,912                   100.0%
                           -----------------------------------------------------------------------------------------------------

Totals - 11 states....          125        10,956,359            1,402,380           12,358,739                    96.2%
                            =====================================================================================================
</TABLE>

(1) The  Company  owns two  properties  that are  subject  to a ground  lease in
Baltimore, Maryland and Las Colinas, Texas.
(2) Nine  commercial  properties  serve as collateral to mortgage notes payable.
See detailed  listing in Schedule III.

                                       13
<PAGE>

         Each of these  properties  will  continue  to be used  for its  current
purpose.  Competition  exists in the market areas in which these  properties are
located. Barriers to entry are relatively low for competitors with the necessary
capital  and the Company  will be  competing  for  properties  and tenants  with
entities that have greater financial  resources than the Company.  However,  the
Company believes that the current overall demand for commercial space is strong.

         The Company has risks that  tenants  will default on leases and declare
bankruptcy. Management believes these risks are mitigated through its geographic
diversity  and its  diverse  tenant  base.  As of  December  31,  1999,  tenants
occupying  approximately  22,000 square feet of  commercial  space have declared
bankruptcy. However, all of the bankrupt tenants remain current on their monthly
rental payments.  In the Company's opinion,  risk of loss due to property damage
is adequately covered by insurance.

         As of December 31, 1999,  none of these  properties has a book value of
more than 10% of the  Company's  current  total assets or accounts for more than
10% of its current aggregate gross revenues.

         The following table sets forth the lease expirations for the properties
owned as of December 31, 1999:

<TABLE>
<CAPTION>
                                                                                              Percentage of Total
                                                                                               Annual Base Rents
                                  Rentable Square Footage      Annual Base Rents Under       Represented by Expiring
   Year of Lease Expiration     Subject to Expiring Leases         Expiring Leases                   Leases
- ----------------------------------------------------------------------------------------------------------------------
<S>                             <C>                             <C>                           <C>

             1999                                 3,410,000                  $34,329,000             27.2%
             2000                                 2,430,000                   27,191,000             21.5%
             2001                                 2,129,000                   21,761,000             17.2%
             2002                                 1,397,000                   16,572,000             13.1%
             2003                                 1,040,000                   11,644,000              9.2%
          Thereafter                              1,119,000                   14,780,000             11.8%
- ----------------------------------------------------------------------------------------------------------------------
            Total                                11,525,000                 $126,277,000            100.0%
======================================================================================================================

</TABLE>

         Environmental Matters: Compliance with laws and regulations relating to
the protection of the  environment,  including  those regarding the discharge of
material into the environment, has not had any material effects upon the capital
expenditures, earnings or competitive position of the Company.

         The properties  contributed by PSI and affiliates  during 1997 and 1998
were each  subject to  environmental  audits  within the  two-year  period ended
December 31, 1995. In addition,  for each of the properties  acquired subsequent
to December 31, 1995, and for each parcel of land purchased for development,  an
environmental  investigation  was  conducted  as  part  of the  acquisition  due
diligence  process.  The  environmental  investigations  have not  revealed  any
environmental  liability that the Company believes would have a material adverse
effect on the Company's  business,  assets or results of operations,  nor is the
Company aware of any potentially  material  environmental  liability,  except as
discussed below.

     The Company acquired a property in Beaverton,  Oregon ("Creekside Corporate
Park") in May 1998. A property adjacent to Creekside Corporate Park is currently
the subject of an environmental remedial investigation/feasibility study that is
being  conducted by the current and past owners of the property,  pursuant to an
order issued by the Oregon Department of Environmental Quality ("ODEQ"). As part
of that study,  ODEQ ordered the property  owners to sample soil and groundwater
on the Company's  property to determine  the nature and extent of  contamination
resulting from past industrial  operations at the property subject to the study.
The  Company,  which is not a party of the Order on Consent,  executed  separate
Access  Agreements  with the property  owners to allow access to its property to
conduct the  required  sampling  and testing.  While the sampling and testing is
ongoing,  preliminary  results indicate that the contamination from the property
subject to the study have  migrated onto a portion of Creekside  Corporate  Park
owned by the Company.


                                       14
<PAGE>

     There  is no  evidence  that  any  past  or  current  use of the  Creekside
Corporate Park property  contributed in any way to the There is no evidence that
any past or current use of the Creekside Corporate Park property  contributed in
any way to the contamination  that is the subject of the current  investigation.
Nevertheless, the parties to the Order on Consent are studying potential removal
or remedial  measures to address any  contamination  detected during the current
investigation,  including any contamination on or under the Creekside  Corporate
Park  property.  Because of the  preliminary  nature of the  investigation,  the
Company cannot predict the outcome of the investigation, nor can it estimate the
costs of any remediation or removal activities that may be required.

         The Company believes that it bears no  responsibility  or liability for
the contamination. In the event the Company is ultimately deemed responsible for
any costs relating to this matter, the Company believes that the party from whom
the property was purchased will be  responsible  for any expenses or liabilities
that the Company may incur as a result of this contamination.

         Although the  environmental  investigations  conducted to date have not
revealed any  environmental  liability  that the Company  believes  would have a
material  adverse  effect  on the  Company's  business,  assets  or  results  of
operations,  and the Company is not aware of any such liability,  it is possible
that these  investigations did not reveal all environmental  liabilities or that
there are material environmental liabilities of which the Company is unaware. No
assurances can be given that (i) future laws,  ordinances,  or regulations  will
not  impose  any  material   environmental   liability,   or  (ii)  the  current
environmental condition of the Properties has not been, or will not be, affected
by tenants and  occupants of the  Properties,  by the condition of properties in
the vicinity of the Properties, or by third parties unrelated to the Company.

         Properties under  Development:  The Company plans to develop office and
"flex"  properties  that are located within or adjacent to existing  parks.  The
properties will be developed using the expertise of local development companies.
The development program is designed to enhance the Company's existing portfolio.

         In June 1999, the Company  completed a 61,000 square foot flex facility
in its park in the Las Colinas  submarket of Dallas,  Texas.  In July 1999,  the
Company  completed a 66,000 square foot office building in its Woodside Business
Park  located in the  Beaverton  submarket  of  Portland,  Oregon,  adjacent  to
existing  facilities  of  approximately   400,000  square  feet.  There  was  no
pre-leasing on either development.  In August 1999, the Dallas facility was 100%
leased to facilitate the expansion of an existing tenant.  As of March 2000, the
Beaverton facility was approximately 83% leased.

         The  following  table  sets forth  certain  information  regarding  the
Company's properties under development as of December 31, 1999:


<TABLE>
<CAPTION>


                                                       Estimated            Rentable Square
     Property Name              Location             Completion Date             Feet               Amount Invested
- ----------------------------------------------------------------------------------------------------------------------
<S>                             <C>                  <C>                    <C>                     <C>

Creekside                 Beaverton, OR                April 2000                 22,000             $    1,964,000
Lafayette                 Chantilly, VA               October 2000               136,000                  1,627,000
Royal Tech 17             Las Colinas, TX            September 2000              100,000                      2,000
Royal Tech 18             Las Colinas, TX             October 2001               100,000                      2,000
Woodside                  Beaverton, OR                   TBD                    136,000                  2,954,000
Pinnacle                  Chantilly, VA                   TBD                     91,000                  2,067,000
                                                                            ------------------       -----------------
                                                                                 585,000             $    8,616,000
                                                                            ==================       =================
</TABLE>


         The  Creekside  project  is  located  within  the  Company's  Creekside
Corporate Park where it has 600,000 square feet of existing  flex/office  space.
The building is a single story office/flex building with glass exterior walls on
four sides.  It is zoned for office,  R&D,  assembly and light  industrial.  The
Company currently has  approximately  1,067,000 square feet of rentable space in
Beaverton,  Oregon.  The project is expected to cost approximately $3.9 million.
Rent stabilization is expected by November 2000.

                                       15
<PAGE>


         The Lafayette  project consists of two single story flex buildings with
glass storefront on three sides of the building.  The Lafayette project consists
of two single story flex buildings  with glass  storefront on three sides of the
building. Typical building depth is a highly efficient 110 feet which can easily
accommodate  either multiple small tenants or full building  users.  The Company
currently has approximately  354,000 square feet of rentable space in Chantilly,
VA.  The  project  is  expected  to  cost  approximately  $11.9  million.   Rent
stabilization is expected by April 2001.

         Subsequent  to year end,  the Company  acquired 21 acres of land in Las
Colinas,  Texas just east of the Dallas Ft.  Worth  International  Airport  with
frontage along I-635 (LBJ Freeway). The Company will develop 200,000 square feet
of single story brick and glass  office/flex in two phases for an estimated cost
of $24 million. The first phase of approximately 100,000 square feet is expected
to be shell  complete by September  2000.  The second phase will  commence  upon
lease up of the first phase.  The Company  currently has  approximately  843,000
square feet of rentable space in Las Colinas, TX.

         The Company owns 8 acres of vacant land in the Woodside  Corporate Park
purchased in 1998. The land is permitted for a three building complex.

         In the second  quarter of 1999, 6.4 acres of land located in Chantilly,
Virginia was  purchased as part of a package of other  properties  that included
297,000  square feet of flex space.  The  proposed  development  is a four story
office building.

                                       16
<PAGE>

ITEM 3.   LEGAL PROCEEDINGS

         On November 3, 1999,  the Company filed an action  entitled PS Business
Parks,  Inc. v. Larry  Howard,  et al.  (Case No.  BC219580)  in the Los Angeles
Superior  Court  seeking  damages in excess of $1 million,  as well as equitable
relief.  The complaint  alleges that Mr.  Howard and entities  controlled by him
engaged in unfair trade practices,  including (1) negotiating kickbacks,  secret
rebates and/or  unearned  discounts from third party  suppliers for  "providing"
Company   business  to  those   suppliers  and  (2)   disrupting  the  Company's
relationship with various suppliers.  Mr. Howard is not an officer,  employee or
authorized agent of the Company.

         On or about  February 14, 2000,  Mr. Howard and entities  controlled by
him filed a  cross-complaint  against the Company,  Public  Storage,  Inc.,  and
several other  cross-defendants  alleging,  among other things, (1) interference
with Mr. Howard's contractual relations with various third party suppliers,  (2)
violation of Title VII of the Civil Rights Act and (3) abuse of process. None of
the cross-complainants  assigned any dollar amount in the cross-complaint to the
claims.   The  Company   intends  to  vigorously   contest  the  claims  in  the
cross-complaint.

         Mary Jayne Howard,  former executive vice president of the Company,  is
married to Mr. Howard.  On March 7, 2000, Ms. Howard ceased  employment with the
Company. Ronald L. Havner, Jr., Chief Executive Officer of the Company,  assumed
Ms. Howard's operational responsibilities.

ITEM 4.   SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

         The Company did not submit any matter to a vote of security  holders in
the fourth quarter of the fiscal year ended December 31, 1999.

ITEM 4A.  EXECUTIVE OFFICERS

         The following is a  biographical  summary of the executive  officers of
the Company:

         Ronald L. Havner,  Jr., age 42, has been Chairman,  President and Chief
Executive  Officer of the Company  since March 1998.  From  December  1996 until
March 1998, Mr. Havner was Chairman,  President and Chief  Executive  Officer of
AOPP.  He was Senior  Vice  President  and Chief  Financial  Officer of PSI,  an
affiliated  REIT,  and Vice  President  of the Company  and certain  other REITs
affiliated with PSI, until December 1996. Mr. Havner became an officer of PSI in
1986,  prior to which he was in the audit practice of Arthur Andersen & Company.
He is a  member  of the  American  Institute  of  Certified  Public  Accountants
(AICPA), the National Association of Real Estate Investments Trusts (NAREIT) and
the Urban Land Institute (ULI) and a Director of Business Machine Security, Inc.
and Mobile Storage Group, Inc.

         Jack E. Corrigan, age 39, a certified public accountant,  has been Vice
President, Chief Financial Officer and Secretary of the Company since June 1998.
From  February  1991  until  June  1998,  Mr.  Corrigan  was a partner of LaRue,
Corrigan & McCormick with responsibility for the audit and accounting  practice.
He was Vice President and Controller of PSI (formerly  Storage  Equities,  Inc.)
from 1989 until February 1991.

         J.  Michael  Lynch,  age  47,  has  been  Vice   President-Director  of
Acquisitions  and Development of the Company since June 1998. Mr. Lynch was Vice
President of Acquisitions  and Development of Nottingham  Properties,  Inc. from
1995 until May 1998.  He has 16 years of real estate  experience,  primarily  in
acquisitions and development.  From 1988 until 1995, Mr. Lynch was a development
project  manager for The  Parkway  Companies.  From 1983 until  1988,  he was an
Assistant Vice President,  Real Estate  Investment  Department of First Wachovia
Corporation.

                                       17
<PAGE>

                                     PART II

ITEM 5.   MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

a.   Market Price of the Registrant's Common Equity:

         The Common Stock (formerly  Common Stock Series A) of the Company (then
known as Public Storage Properties XI, Inc.) began trading on the American Stock
Exchange on March 27, 1991 under the symbol  PSM. In  connection  with the March
1998 merger of AOPP into the Company,  the Company  changed its name from Public
Storage  Properties XI, Inc. to PS Business Parks, Inc. and the Company's Common
Stock  Series A was  reclassified  as  Common  Stock and  began  trading  on the
American Stock Exchange under the symbol PSB.

         The  following  table sets  forth the high and low sales  prices of the
Common Stock (formerly Common Stock Series A) on the American Stock Exchange for
the applicable periods:

                                                            Range
                                            ------------------------------------
      Year                Quarter                High                 Low
- -------------------    -----------------    -----------------    ---------------

       1999                  1st                $23-3/4              $21-3/8
                             2nd                 26-3/8               21-5/8
                             3rd                 26                   21-7/8
                             4th                 24-1/8               20-1/4

       1998                  1st                 24-1/2               20-1/2
                             2nd                 25-3/4               22-5/16
                             3rd                 26-5/8               18-7/16
                             4th                 24-3/8               18

         As of March 24, 2000, there were approximately 744 holders of record of
the Common Stock.

b.   Dividends

         Holders of Common Stock are entitled to receive  distributions when and
if  declared  by the  Company's  Board of  Directors  out of any  funds  legally
available for that  purpose.  The Company is required to distribute at least 95%
of its net taxable  ordinary  income  prior to the filing of the  Company's  tax
return and 85%,  subject to certain  adjustments,  during the calendar  year, to
maintain its REIT status for federal  income tax  purposes.  It is  management's
intention to pay distributions of not less than this required amount.

         Distributions paid per share of Common Stock for 1999 and 1998 amounted
to $1.00 and $1.10,  respectively  (distributions  paid prior to March 17,  1998
refer to distributions paid on the AOPP common stock).

         Since the second  quarter of 1998,  the  Company has  declared  regular
quarterly dividends of $0.25 per common share. This reflects a decrease from the
quarterly  dividend  of $0.34 per common  share  which was paid to the  previous
shareholders of Public Storage  Properties XI, Inc. through the first quarter of
1998. The Board of Directors has  established a distribution  policy to maximize
the  retention of operating  cash flow and only  distribute  the minimum  amount
required for the Company to maintain its tax status as a REIT.


                                       18
<PAGE>
ITEM 6.   SELECTED FINANCIAL DATA (1)
<TABLE>
<CAPTION>
                                                  For the Years Ended                                         For the Years Ended
                                                      December 31,              For the Periods (2)               December 31,
                                                ------------------------ --------------------------------  ------------------------
                                                                          April 1, 1997   January 1, 1997
                                                                             through        through
                                                                           December 31,     March 31,
                                                   1999         1998          1997            1997             1996         1995
                                                ----------- ------------  -------------  ----------------  -----------  -----------
                                                                      (In thousands, except per share data)
<S>                                             <C>         <C>           <C>             <C>               <C>          <C>
Revenues:
Rental income.................................  $ 125,327   $  88,320     $ 24,364        $   5,805         $     -      $     -
Facility management fees......................        471         529          709              247           2,133        2,044
Interest income...............................      2,815       1,411          424               29              43           37
                                                ----------- ------------  -------------  ----------------  -----------  -----------
                                                   28,613      90,260       25,497            6,081           2,176        2,081
                                                ----------- ------------  -------------  ----------------  -----------  -----------
Expenses:
Cost of operations............................     34,891      26,073        9,837            2,493               -            -
Cost of facility management...................         94          77          129               60             514          570
Depreciation and amortization.................     29,762      18,908        4,375              820               -            -
General and administrative....................      3,153       2,233        1,248              213           1,143          319
Interest expense..............................      3,153       2,361            1                -               -            -
                                                ----------- ------------  -------------  ----------------  -----------  -----------
                                                   71,053      49,652       15,590            3,586           1,657          889
                                                ----------- ------------  -------------  ----------------  -----------  -----------
Income  before  minority  interest, income
 taxes and extraordinary item.................     57,560      40,608        9,907            2,495             519        1,192
Minority interest in income - preferred units.     (4,156)          -            -                -               -            -
Minority interest in income - common units....    (11,954)    (11,208)      (6,753)          (1,813)              -            -
                                                ----------- ------------  -------------  ----------------  -----------  -----------
Income before income taxes and extraordinary
 item.........................................     41,450      29,400        3,154              682             519        1,192
Income tax expense (3)........................          -           -            -                -            (216)        (472)
                                                ----------- ------------  -------------  ----------------  -----------  -----------
Income before extraordinary item..............     41,450      29,400        3,154              682             303          720
Extraordinary item, net of minority interest..       (195)          -            -                -               -            -
                                                ----------- ------------  -------------  ----------------  -----------  -----------
Net income....................................  $  41,255   $  29,400     $  3,154        $     682         $   303      $   720
                                                =========== ============  =============  ================  ===========  ===========
Net income allocation:                          $   3,406   $       -     $      -        $       -         $     -      $     -
Allocable to preferred shareholders...........     37,849      29,400        3,154              682             303          720
                                                ----------- ------------  -------------  ----------------  -----------  -----------
Allocable to common shareholders..............  $  41,255   $  29,400     $  3,154        $     682         $   303      $   720
                                                =========== ============  =============  ================ ============  ===========
- -----------------------------------------------------------------------------------------------------------------------------------
Per Common Share:
- -----------------
Distribution..................................  $    1.00   $    1.10     $   0.68        $    0.00         $  0.43      $  0.90
Net income - Basic............................  $    1.60   $    1.52     $   0.92        $    0.31         $  0.32      $  0.80
Net income - Diluted..........................  $    1.60   $    1.51     $   0.92        $    0.31         $  0.32      $  0.80
Weighted average common shares - Basic........     23,641      19,361        3,414            2,193             947          905
Weighted average common shares - Diluted......     23,709      19,429        3,426            2,193             947          905
- -----------------------------------------------------------------------------------------------------------------------------------
Balance Sheet Data:
- -------------------
Total assets..................................  $ 903,741   $ 709,414     $323,454        $ 136,922         $ 1,941      $ 1,110
Total debt....................................     37,066      50,541        3,500                -               -            -
Minority interest - preferred units...........    132,750           -            -                -               -            -
Minority interest - common units..............    157,199     153,015      168,665           97,180               -            -
Preferred stock...............................     55,000           -            -                -               -            -
Common shareholders' equity...................  $ 500,531   $ 489,905     $142,958        $  36,670         $ 1,734      $ 1,041
- -----------------------------------------------------------------------------------------------------------------------------------
Other Data:
- -----------
Net cash provided by operating activities.....  $  88,440   $  60,228     $ 13,597        $   5,840         $   413      $   950
Net cash used in investing activities.........   (131,318)   (308,646)     (47,105)            (582)              -            -
Net cash provided by (used in) financing          111,030     250,602       31,443             (228)           (378)         (84)
 activities...................................
Funds from operations (4).....................  $  76,353   $  57,430     $ 14,282        $   3,315         $   303      $   720
FFO per share.................................  $    2.45   $    2.14     $   1.33        $    0.41         $  0.32      $  0.80
Square footage owned at end of period.........     12,359      10,930        6,009            3,014               -            -
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
(1) The selected  financial  data for periods  prior to March 17, 1998 refers to
AOPP.
(2) See Note 2 of the Notes to Consolidated Financial Statements.
(3) During  1997,  the Company  qualified  and intends to qualify as a REIT,  as
defined in Section 856 of the Internal  Revenue Code. As a REIT,  the Company is
not subject to federal income tax to the extent that it distributes  its taxable
income to its shareholders.
(4) Funds  from  operations  ("FFO")  is  defined  as net  income,  computed  in
accordance  with  generally  accepted  accounting   principles  ("GAAP")  before
depreciation,  amortization,  minority  interest in income,  straight  line rent
adjustments and extraordinary or non-recurring items. FFO does not represent net
income or cash flows from  operations as defined by GAAP. FFO does not take into
consideration  scheduled  principal  payments on debt and capital  improvements.
Accordingly,  FFO is not necessarily a substitute for cash flow or net income as
a measure of liquidity or operating  performance or ability to make acquisitions
and  capital  improvements  or ability to pay  distributions  or debt  principal
payments.  Also,  FFO as  computed  and  disclosed  by the  Company  many not be
comparable to FFO computed and disclosed by other REITs.
                                       19
<PAGE>

ITEM 7.   MANAGEMENT'S  DISCUSSION AND  ANALYSIS  OF  FINANCIAL   CONDITION  AND
          RESULTS  OF OPERATIONS

         The following  discussion and analysis of the results of operations and
financial condition of PS Business Parks, Inc. (the "Company") should be read in
conjunction  with the selected  financial  data and the  Company's  consolidated
financial  statements  and notes  thereto  included  elsewhere in the form 10-K.
References to the Company for periods prior to March 17, 1998 refer to AOPP.

         Forward-Looking  Statements:  When used within this document, the words
"expects,"   "believes,"   anticipates,"   "should,"  "estimates,"  and  similar
expressions  are intended to identify  "forward-looking  statements"  within the
meaning of that term in Section 27A of the  Securities  Exchange Act of 1933, as
amended,  and in Section 21F of the Securities Exchange Act of 1934, as amended.
Such forward-looking statements  involve known and unknown risks,  uncertainties
and other factors.  Actual results could differ  materially from those set forth
in the forward-looking  statements as a result of various factors.  Such factors
include,  but are not limited to a change in economic  conditions in the various
markets  served by the Company's  operations  which would  adversely  affect the
level of demand for rental of  commercial  space and the cost  structure  of the
Company,  general real estate  investment risks,  competition,  risks associated
with  acquisition and development  activities and debt financing,  environmental
matters,  general uninsured losses and seismic  activity.  Readers are cautioned
not to place undue  reliance on these  forward-looking  statements,  which speak
only as of the date hereof.  The Company  undertakes  no  obligation to publicly
release  the result of any  revisions  to these  forward-looking  statements  to
reflect  events  or  circumstances  after  the date  hereof  or to  reflect  the
occurrence of unanticipated events.

         Overview:  During 1999 and 1998, the Company focused on increasing cash
flow from its existing core  portfolio of  properties,  expanded its presence in
existing markets through strategic acquisition and developments and strengthened
its  balance  sheet  primarily  through  the  issuance  of common and  preferred
stock/units  at reasonable  prices.  By  maintaining  low leverage,  the Company
facilitated future growth.

         During 1999, the Company added approximately 1.3 million square feet to
its  portfolio  at an  aggregate  cost  of  approximately  $103  million.  These
acquisitions increase the Company's presence in its existing markets,  which the
Company believes have the  characteristics  necessary for long-term growth.  The
Company  acquired  483,000 square feet in Texas for  approximately  $32 million,
405,000 square feet in Northern  Virginia/Maryland  market for approximately $41
million,  211,000  square  feet in Northern  California  for  approximately  $17
million and 200,000 square feet in Arizona for approximately $13 million.

         During  1998,  the  Company  added  4.9  million  square  feet  to  its
portfolio.  The cost of these acquisitions was approximately  $378 million.  The
acquisitions  added  square  footage  to each  of the  Company's  existing  core
markets.  The Company  acquired  1,687,000  square feet in Texas at an aggregate
cost of approximately $102 million; 1,001,000 square feet in Portland, Oregon at
an aggregate cost of  approximately  $115 million;  1,442,000 square feet in the
Northern  Virginia/Maryland  market at an aggregate cost of  approximately  $108
million;  422,000  square feet in Southern  California  at an aggregate  cost of
approximately  $25 million and 307,000 square feet in Northern  California at an
aggregate cost of approximately $25 million.  In addition,  the Company acquired
62,000  square  feet in the  Merger at an  aggregate  cost of  approximately  $3
million in a market the Company does not consider a core market.

Comparison of 1999 to 1998
- --------------------------

         Results of Operations:  Net income for the year ended December 31, 1999
was $41,255,000  compared to $29,400,000 for the same period in 1998. Net income
allocable to common shareholders (net income less preferred stock dividends) for
the year ended December 31, 1999 was $37,849,000 compared to $29,400,000 for the
same period in 1998.  Net income per common  share on a diluted  basis was $1.60
(based on weighted average diluted common shares  outstanding of 23,709,000) for
the year ended  December  31, 1999  compared to net income per common share on a
diluted  basis of  $1.51  (based  on  weighted  average  diluted  common  shares
outstanding of  19,429,000)  for the year ended December 31, 1998. The increases
in net income and net income per share reflect the Company's  significant growth
in its asset base through the  acquisition of commercial  properties in addition
to increased net operating income from its stabilized base of properties.

                                       20
<PAGE>


         The  Company's  property  operations  account for almost all of the net
operating  income  earned by the  Company.  The  following  table  presents  the
pre-depreciation  operating  results  of the  properties  for  the  years  ended
December 31, 1999 and 1998:

<TABLE>
<CAPTION>
                                                                       1999              1998            Change
                                                                  --------------     -------------     -----------
<S>                                                               <C>                 <C>              <C>
Rental income:
Facilities  owned  throughout each period (50 facilities owned
     throughout  each period,  6.4 million net rentable square
     feet)....................................................      $63,356,000       $58,755,000           7.8%
Facilities   acquired   subsequent   to   January   1998   (75
     facilities, 6.0 million net rentable square feet)........       61,971,000        29,565,000         109.6%
                                                                  --------------     -------------     -----------
Total rental income...........................................     $125,327,000       $88,320,000          41.9%
                                                                  ==============     =============     ===========

Cost of operations (excluding depreciation):
Facilities owned throughout each period.......................      $19,297,000       $18,855,000           2.3%
Facilities acquired subsequent to January 1998................       15,594,000         7,218,000         116.0%
                                                                  --------------     -------------     -----------
Total cost of operations......................................      $34,891,000       $26,073,000          33.8%
                                                                  ==============     =============     ===========


Net operating income (rental income less cost of operations):
Facilities owned throughout each period.......................      $44,059,000       $39,900,000          10.4%
Facilities acquired subsequent to January 1998................       46,377,000        22,347,000         107.5%
                                                                  --------------     -------------     -----------
Total net operating income....................................      $90,436,000       $62,247,000          45.3%
                                                                  ==============     =============     ===========
</TABLE>


         Rental  income  and  rental  income  less  cost  of  operations  or net
operating income ("NOI") prior to depreciation are summarized for the year ended
December     31,     1999     by     major     geographic     regions     below:

<TABLE>
<CAPTION>


                              Square         Percent         Rental         Percent                       Percent
        Region               Footage        of Total         Income         of Total        NOI           of Total
- ------------------------   --------------   ----------    -------------     ---------   -------------     ---------
<S>                        <C>              <C>           <C>               <C>         <C>               <C>
Southern California....       3,091,000         25.0%      $33,962,000         27.1%     $25,426,000         28.1%
Northern California....       1,317,000         10.7%       12,376,000          9.9%       9,176,000         10.1%
Southern Texas.........       1,031,000          8.3%        9,899,000          7.9%       6,430,000          7.1%
Northern Texas.........       2,003,000         16.2%       16,094,000         12.8%      10,868,000         12.0%
Virginia...............       1,612,000         13.0%       18,824,000         15.0%      13,679,000         15.1%
Maryland...............       1,104,000          8.9%       13,615,000         10.9%       9,642,000         10.7%
Oregon.................       1,169,000          9.5%       14,684,000         11.7%      11,465,000         12.8%
Other..................       1,032,000          8.4%        5,873,000          4.7%       3,750,000          4.1%
                           --------------   ----------    -------------     ---------   -------------     ---------
                             12,359,000        100.0%     $125,327,000        100.0%     $90,436,000        100.0%
                           ==============   ==========    =============     =========   =============     =========

</TABLE>

         Supplemental  Property  Data  and  Trends:  In order  to  evaluate  the
performance  of  the  Company's  overall  portfolio,   management  analyzes  the
operating  performance of a consistent  group of 62 properties  (7.2 million net
rentable square feet). These 62 properties in which the Company currently has an
ownership  interest (herein referred to as the "Same Park" facilities) have been
managed by the Company since January 1998.  The following  table  summarizes the
pre-depreciation  historical  operating  results of the "Same  Park"  facilities
excluding the effects of accounting for rental income on a straight-line basis.

                                       21
<PAGE>

         Beginning  with the first  quarter  of 2000,  the  Company  will add 48
properties  acquired in 1998 totaling  approximately four million square feet to
its "Same Park"  facilities.  These properties will have been owned and operated
for the comparable periods and will provide a more comprehensive analysis of the
portfolio's  operations.  In addition,  the Company will subtract two properties
totaling approximately 392,000 square feet that it plans to sell during the next
twelve months.  The "Same Park"  facilities  will then total 10.8 million square
feet and  represent  approximately  87% of the square  footage of the  Company's
existing portfolio.

                     "Same Park" Facilities (62 Properties)
                     --------------------------------------
<TABLE>
<CAPTION>
                                                                         Year Ended
                                                                        December 31,
                                                             ------------------------------------
                                                                   1999               1998 (4)          Change
                                                             ----------------    ----------------     -----------
  <S>                                                        <C>                 <C>                  <C>


  Rental income (1)....................................      $  72,641,000       $  67,191,000             8.1%
  Cost of operations...................................         22,838,000          22,491,000             1.5%
                                                             ----------------    ----------------     -----------
  Net operating income.................................      $  49,803,000       $  44,700,000            11.4%
                                                             ================    ================     ===========


  Gross margin (2).....................................          68.6%               66.5%                 2.1%



  Weighted average for period:
  ----------------------------

      Occupancy........................................          96.5%               94.5%                 2.0%
      Annualized realized rent per sq. ft.(3) .........          $10.45              $9.87                 5.9%


</TABLE>

- --------------
(1) Rental income does not include the effect of straight-line accounting.

(2) Gross margin is computed by dividing property net operating income by rental
income.

(3) Realized  rent per square foot  represents  the actual  revenues  earned per
occupied square foot.

(4)  Operations  for the year ended  December 31, 1998  represent the historical
operations  of the 62  properties;  however,  the Company did not own all of the
properties  throughout the periods  presented and therefore such  operations are
not reflected in the Company's historical operating results. All such properties
were owned effective March 17, 1998.

The  following  table  summarizes  the "Same  Park"  operating  results by major
geographic region for the year ended December 31, 1999 and 1998:

<TABLE>
<CAPTION>


                             Revenues        Revenues        Percent          NOI             NOI            Percent
         Region                1999            1998         Increase         1999             1998           Increase
- ------------------------   --------------   ------------  -------------    ---------      --------------    -----------
<S>                        <C>              <C>           <C>              <C>            <C>               <C>
Southern California.....    $32,510,000     $29,189,000       11.4%        $23,678,000     $20,317,000         16.5%
Northern California.....      8,337,000       7,673,000        8.7%          6,113,000       5,406,000         13.1%
Southern Texas..........      4,158,000       3,832,000        8.5%          2,161,000       1,928,000         12.1%
Northern Texas..........      2,952,000       2,825,000        4.5%          1,574,000       1,531,000          2.8%
Virginia................      9,119,000       8,634,000        5.6%          6,102,000       5,654,000          7.9%
Maryland................      9,065,000       8,662,000        4.7%          6,152,000       5,858,000          5.0%
Arizona.................      2,812,000       2,730,000        3.0%          1,737,000       1,749,000         (0.7%)
Other...................      3,688,000       3,646,000        1.1%          2,286,000       2,257,000          1.2%
                           --------------   ------------  -------------    ------------   --------------    -----------
                            $72,641,000     $67,191,000        8.1%        $49,803,000     $44,700,000         11.4%
                           ==============   ============  =============    ============   ==============    ===========

</TABLE>

                                       22
<PAGE>

         The  increases  noted above  reflect the  performance  of the Company's
existing markets.  All major markets reflected  increases in rental rates. There
were some corresponding increases in operating expenses in Texas and Arizona due
primarily to property tax increases.

         Facility  Management  Operations:  The  Company's  facility  management
accounts for a small portion of the Company's net operating  income.  During the
year ended  December 31, 1999,  $377,000 in net operating  income was recognized
from facility management  operations compared to $452,000 for the same period in
1998. Facility  management fees have decreased due to the Company's  acquisition
of properties previously managed.

         Interest and Other Income:  Interest and other income reflects earnings
on cash  balances.  Interest and other income was  $2,815,000 for the year ended
December  31, 1999  compared  to  $1,411,000  for the same  period in 1998.  The
increase is attributable to increased average cash balances primarily due to the
Company's  issuance of  preferred  stock and  preferred  units in its  Operating
Partnership.  Average cash  balances  for the year ended  December 31, 1999 were
approximately  $51.2  million,  compared to $28.2 million for the same period in
1998.

         Cost of Operations:  Cost of operations for the year ended December 31,
1999 was  $34,891,000  compared to $26,073,000  for the same period in 1998. The
increase  is due  primarily  to the  growth in the total  square  footage of the
Company's portfolio of properties.  Cost of operations as a percentage of rental
income  decreased  from 29.5% for the year ended  December 31, 1998 to 27.8% for
the year ended  December 31, 1999 as a result of  increasing  revenues  combined
with controlled  expenses.  Controlled  expenses  resulted from the economies of
scale achieved through the acquisition of properties in existing  markets.  Cost
of  operations  consists  primarily of property  taxes  ($10,931,000),  property
maintenance ($6,051,000), utilities ($6,020,000) and direct payroll ($5,607,000)
for the year ended December 31, 1999.

         Depreciation  and Amortization  Expense:  Depreciation and amortization
expense  for the year  ended  December  31,  1999 was  $29,762,000  compared  to
$18,908,000  for the same period in 1998. The increase is due to the acquisition
of real estate facilities in 1998 and 1999.

         General and Administrative Expense:  General and administrative expense
was  $3,153,000  for the year ended December 31, 1999 compared to $2,233,000 for
the same period in 1998. The increase is due primarily to the growth in the size
of the Company.  Included in general and  administrative  costs are  acquisition
costs and abandoned  transaction costs.  Acquisition  expenses for 1999 and 1998
were $430,000 and $844,000,  respectively.  Abandoned transaction costs for 1999
and 1998 were $41,000 and $65,000, respectively.

         Interest  Expense:  Interest  expense was $3,153,000 for the year ended
December 31, 1999 compared to $2,361,000  for the same period in 1998.  Interest
expense  consists of $3,121,000  associated  with mortgage  notes and $1,021,000
associated with the line of credit and temporary financing of acquisitions,  net
of $989,000 of interest expense capitalized to ongoing construction projects for
the year ended December 31, 1999.

         Minority  Interest in Income:  Minority interest in income reflects the
income allocable to equity interests in the Operating  Partnership which are not
owned by the Company.  Minority  interest in income for the year ended  December
31, 1999 was  $16,049,000  ($4,156,000  allocated to preferred  unitholders  and
$11,893,000  allocated to common unitholders)  compared to $11,208,000 allocated
to common  unitholders  for the same  period in 1998.  The  increase in minority
interest  in income is due  primarily  to the  issuance of  preferred  operating
partnership  units and to a lesser  extent,  the issuance of  additional  common
units in connection with the acquisition of real estate  facilities and improved
operating results.

                                       23
<PAGE>

Comparison of 1998 to 1997
- --------------------------

         Comparison  with 1997  Results:  On March 31, 1997,  PSI  exchanged its
non-voting  preferred  stock for voting  common  stock of AOPP in a  transaction
accounted  for as a purchase of AOPP by PSI. As a result of PSI  attaining a 95%
ownership  interest in AOPP voting common stock, the financial  results for 1997
are  presented  separately  for the  period  prior to the  exchange  transaction
(January 1, 1997 to March 31, 1997) and  subsequent to the exchange  transaction
(April 1, 1997 to December 31, 1997). To properly compare the operating  results
for the year ended December 31, 1997 to the same period in the current year, the
amounts for 1997 have been combined as follows:

<TABLE>
<CAPTION>


                                                                 April 1, 1997     January 1, 1997     For the Year
                                                                    through           through             Ended
                                                                  December 31,        March 31,         December 31,
                                                                      1997              1997               1997
                                                                 ---------------   ----------------   ---------------
<S>                                                              <C>               <C>                <C>
Revenues:
   Rental income.............................................     $  24,364,000       $ 5,805,000     $   30,169,000
   Facility management fees from affiliates..................           709,000           247,000            956,000
   Interest income...........................................           424,000            29,000            453,000
                                                                 ---------------   ----------------   ---------------
                                                                     25,497,000         6,081,000         31,578,000
                                                                 ---------------   ----------------   ---------------


Expenses:
  Cost of operations.........................................         9,837,000         2,493,000         12,330,000
  Cost of facility management................................           129,000            60,000            189,000
  Depreciation and amortization..............................         4,375,000           820,000          5,195,000
  General and administrative.................................         1,248,000           213,000          1,461,000
  Interest expense...........................................             1,000                 -              1,000
                                                                 ---------------   ----------------   ---------------
                                                                     15,590,000         3,586,000         19,176,000
                                                                 ---------------   ----------------   ---------------


Income before minority interest..............................         9,907,000         2,495,000         12,402,000


  Minority interest in income................................        (6,753,000)       (1,813,000)        (8,566,000)
                                                                 ---------------   ----------------   ---------------

Net income...................................................      $  3,154,000       $   682,000      $   3,836,000
                                                                 ===============   ================   ===============

</TABLE>


         Results of Operations:  Net income for the year ended December 31, 1998
was  $29,400,000  compared to $3,836,000 for the same period in 1997. Net income
per common share on a diluted basis was $1.51 (based on weighted average diluted
common shares  outstanding of  19,429,000)  for the year ended December 31, 1998
compared to net income per common  share on a diluted  basis of $1.23  (based on
weighted  average  diluted common shares  outstanding of 3,129,000) for the year
ended December 31, 1997, representing an increase of 22.7%. The increases in net
income and net income per share reflects the Company's significant growth in its
asset base through the acquisition of commercial  properties and increase in net
operating income from the consistent group of properties.

                                       24
<PAGE>

         The  Company's  property  operations  account for almost all of the net
operating  income  earned by the  Company.  The  following  table  presents  the
pre-depreciation  operating  results  of the  properties  for  the  years  ended
December 31, 1998 and 1997:

<TABLE>
<CAPTION>

                                                                        1998               1997              Change
                                                                  ----------------    ----------------     -----------

<S>                                                               <C>                 <C>                  <C>
Rental income:
Facilities  owned  throughout each period (35 facilities, 3.0
   million net rentable square feet)..........................        $25,045,000       $23,936,000             4.6%
Facilities  acquired  between  March 31, 1997 and December 31,
     1998 (71  facilities,  7.9  million net  rentable  square
     feet)....................................................         63,275,000         6,233,000           915.2%
                                                                  ----------------    ----------------     -----------
Total rental income...........................................        $88,320,000       $30,169,000           192.8%
                                                                  ================    ================     ===========

Cost of operations (excluding depreciation):
Facilities owned throughout each period.......................        $10,023,000       $10,073,000            (0.5%)
Facilities  acquired  between  March 31, 1997 and December 31,
     1998.....................................................         16,050,000         2,257,000           611.1%
                                                                  ----------------    ----------------     -----------
Total cost of operations......................................        $26,073,000       $12,330,000           111.5%
                                                                  ================    ================     ===========


Net operating income (rental income less cost of operations):.
Facilities owned throughout each period.......................        $15,022,000       $13,863,000             8.4%
Facilities  acquired  between  March 31, 1997 and December 31,
     1998.....................................................         47,225,000         3,976,000         1,087.8%
                                                                  ----------------    ----------------     -----------
Total net operating income....................................        $62,247,000       $17,839,000           248.9%
                                                                  ================    ================     ===========

</TABLE>


         Rental  income  and  rental  income  less  cost  of  operations  or net
operating income ("NOI") prior to depreciation are summarized for the year ended
December 31, 1998 by major geographic regions below:


<TABLE>
<CAPTION>

                                 Square        Percent         Rental         Percent                        Percent
          Region                 Footage       of Total        Income         of Total          NOI          of Total
- ------------------------     --------------   ------------  -------------    ------------  --------------    ---------
<S>                          <C>              <C>            <C>              <C>           <C>               <C>
Southern California........       3,085,000        28.2%      $28,930,000       32.7%       $20,803,000         33.4%
Northern California........       1,105,000        10.1%        7,557,000        8.6%         5,513,000          8.9%
Virginia/Maryland..........       2,315,300        21.2%       22,710,000       25.7%        15,864,000         25.5%
Texas......................       2,489,700        22.8%       13,927,000       15.8%         8,865,000         14.2%
Oregon.....................       1,102,300        10.0%        9,725,000       11.0%         7,652,000         12.3%
Other......................         832,600         7.7%        5,471,000        6.2%         3,550,000          5.7%
                             --------------   ------------  -------------    ------------  --------------    ---------
Total......................      10,929,900       100.0%      $88,320,000      100.0%       $62,247,000        100.0%
                             ==============   ============  =============    ============  ==============    =========

</TABLE>


                                       25

<PAGE>


         Supplemental  Property  Data  and  Trends:  In order  to  evaluate  the
performance of the Company's overall portfolio, management Supplemental Property
Data and Trends:  In order to evaluate the performance of the Company's  overall
portfolio,  management analyzes the operating  performance of a consistent group
of 51 properties  (4.2 million net rentable  square  feet).  These 51 properties
represent a mature group of properties that have been managed by the Company for
at least three years and, as of March 17, 1998,  were owned by the Company.  The
following table summarizes the pre-depreciation  historical operating results of
the "Same Park" facilities excluding the effects of accounting for rental income
on a straight-line basis.


                     "Same Park" Facilities (51 Properties)
                     --------------------------------------
<TABLE>
<CAPTION>
                                                                         Year Ended
                                                                        December 31,
                                                             ------------------------------------
                                                                 1998 (4)            1997 (4)           Change
                                                             ----------------    ----------------     -----------
  <S>                                                        <C>                 <C>                     <C>

  Rental income (1)....................................      $  38,927,000       $  36,760,000           5.9%

  Cost of operations...................................         14,718,000          14,655,000           0.4%
                                                             ----------------    ----------------     -----------
  Net operating income.................................      $  24,209,000       $  22,105,000           9.5%
                                                             ================    ================     ===========

  Gross margin (2).....................................          62.2%               60.1%               2.1%


  Weighted average for period:
  ---------------------------

      Occupancy........................................          95.1%               94.6%               0.5%
      Annualized realized rent per sq. ft.(3) .........          $9.74               $9.24               5.4%

</TABLE>
- ------------------
(1) Rental income does not include the effect of straight-line accounting.

(2) Gross margin is computed by dividing property net operating income by rental
income.

(3) Realized  rent per square foot  represents  the actual  revenues  earned per
occupied square foot.

(4)  Operations  for the year ended  December  31, 1998 and 1997  represent  the
historical operations of the 51 properties; however, the Company did not own all
of the properties throughout the periods presented and therefore such operations
are not  reflected  in the  Company's  historical  operating  results.  All such
properties were owned effective March 17, 1998.

The following table  summarizes the operating  results  displayed above by major
geographic regions:

<TABLE>
<CAPTION>

                                 Revenues      Revenues      Percentage          NOI           NOI        Percentage
                                   1998          1997         Increase          1998           1997        Increase
                               ------------   -----------    ----------     ------------   ------------   ----------
<S>                            <C>            <C>            <C>            <C>            <C>            <C>
Southern California........    $14,965,000    $14,362,000       4.2%         $9,639,000     $9,075,000       6.2%
Northern California........      5,668,000      5,227,000       8.4%          3,836,000      3,472,000      10.5%
Virginia/Maryland..........      5,271,000      4,953,000       6.4%          3,314,000      2,854,000      16.1%
Texas......................      6,649,000      6,394,000       4.0%          3,407,000      3,206,000       6.3%
Arizona....................      2,728,000      2,477,000      10.1%          1,731,000      1,488,000      16.3%
Other......................      3,646,000      3,347,000       8.9%          2,282,000      2,010,000      13.5%
                               ------------   -----------    ----------     ------------   ------------   ----------
                               $38,927,000    $36,760,000       5.9%        $24,209,000    $22,105,000       9.5%
                               ============   ===========    ==========     ============   ============   ==========

</TABLE>

The  increases   noted   above   reflect  the  performance   of  the   Company's
existing   markets.    All    major  markets   reflected  increases  in   rental
rates without corresponding increases in  expenses.

                                       26
<PAGE>

         Facility Management Operations: The Company's net operating income from
facility  management accounts for a small portion of the Company's net operating
income.  During the year ended  December  31,  1998,  $452,000 in net  operating
income was recognized from facility  management  operations compared to $767,000
for the same period in 1997.  Facility management fees have decreased due to the
Company's acquisition of properties previously managed.

         Interest and Other Income:  Interest and other income reflects earnings
on cash  balances.  Interest and other income was  $1,411,000 for the year ended
December 31, 1998 compared to $453,000 for the same period in 1997. The increase
is  attributable  to  increased  average  cash  balances  primarily  due  to the
Company's  issuance  of common  stock in January  and May 1998 and the timing of
investing  these funds in newly  acquired real estate  facilities.  Average cash
balances for the year ended  December 31, 1998 were  approximately  $28 million,
compared to $9 million for the same period in 1997.

         Cost of Operations:  Cost of operations for the year ended December 31,
1998 was  $26,073,000  compared to $12,330,000  for the same period in 1997. The
increase  is due  primarily  to the  growth in the total  square  footage of the
Company's portfolio of properties.  Cost of operations as a percentage of rental
income  decreased  from 40.9% for the year ended  December 31, 1997 to 29.5% for
the year ended  December  31, 1998 as a result of  economies  of scale  achieved
through the  acquisition of properties in existing  markets.  Cost of operations
consists  primarily  of  property  taxes  ($6,967,000),   property   maintenance
($4,643,000),  utilities  ($4,558,000)  and direct payroll  ($3,981,000) for the
year ended December 31, 1998.

         Depreciation  and Amortization  Expense:  Depreciation and amortization
expense  for the year  ended  December  31,  1998 was  $18,908,000  compared  to
$5,195,000 for the same period in 1997. The increase is due to the  acquisitions
of real estate facilities in 1997 and 1998.

         General and Administrative Expense:  General and administrative expense
was  $2,233,000  for the year ended December 31, 1998 compared to $1,461,000 for
the  same  period  in  1997.  The  increase  is due to the  increased  size  and
acquisition  activities of the Company.  Included in general and  administrative
costs  are  acquisition  costs  and  abandoned  transaction  costs.  Acquisition
expenses for 1998 and 1997 were  $844,000 and $177,000  respectively.  Abandoned
transaction costs for 1998 and 1997 were $65,000 and $5,000, respectively.

         Interest  Expense:  Interest  expense was $2,361,000 for the year ended
December 31, 1998  compared to $1,000 for the same period in 1997.  The increase
is  attributable to mortgage notes assumed in connection with the acquisition of
real estate  facilities  totaling  approximately  $38 million  ($1.5  million in
interest  expense),  temporary  financing in connection with acquisitions  ($0.5
million  in  interest  expense),  costs to  establish  the line of credit  ($0.5
million) and commitment fees ($0.1 million) net of $268,000 of interest  expense
capitalized to ongoing construction projects.

         Minority  Interest in Income:  Minority interest in income reflects the
income allocable to equity  interests in the Operating  Partnership that are not
owned by the Company.  Minority  interest in income for the year ended  December
31, 1998 was $11,208,000 compared to $8,566,000 for the same period in 1997. The
increase in minority interest in income is due to improved operating results and
the issuance of additional Operating Partnership units,  primarily in connection
with the acquisition of real estate facilities on April 1, 1997.

                                       27
<PAGE>

Liquidity and Capital Resources
- -------------------------------

         Net cash provided by operating  activities  for the year ended December
31, 1999 and 1998 was  $88,440,000  and  $60,228,000,  respectively.  Management
believes that its internally generated net cash provided by operating activities
will  continue to be  sufficient  to enable it to meet its  operating  expenses,
capital  improvements,  debt service requirements and maintain the current level
of distributions to shareholders.

         The following  table  summarizes the Company's  ability to make capital
improvements  to maintain  its  facilities  through the use of cash  provided by
operating activities. The remaining cash flow is available to the Company to pay
distributions  to  shareholders,  make  principal  payments  on debt and to make
investments in real estate.


<TABLE>
<CAPTION>
                                                                                     Year Ended December 31,
                                                                                 ---------------------------------
                                                                                      1999               1998
                                                                                 ---------------    --------------

<S>                                                                              <C>                 <C>
Net income............................................................            $41,255,000        $29,400,000
Depreciation and amortization.........................................             29,762,000         18,908,000
Minority interest in income...........................................             16,048,000         11,208,000
Change in working capital.............................................              1,375,000            712,000
                                                                                 ---------------    --------------
Net cash provided by operating activities.............................             88,440,000         60,228,000

Maintenance capital expenditures......................................             (3,911,000)        (3,376,000)
Tenant improvements...................................................             (5,555,000)        (5,258,000)
Capitalized lease commissions.........................................             (2,213,000)        (1,979,000)
                                                                                 ---------------    --------------
Funds available for distribution to shareholders, minority interests,
   acquisitions and other corporate purposes..........................             76,761,000         49,615,000

Cash distributions to shareholders and minority interests.............            (38,632,000)       (29,904,000)
                                                                                 ---------------    --------------
Excess funds available for principal payments on debt, investments in
   real estate and other corporate purposes...........................            $38,129,000        $19,711,000
                                                                                 ===============    ==============

</TABLE>

         The  Company's  capital  structure is  characterized  by a low level of
leverage.  As of December  31, 1999,  the Company had eight fixed rate  mortgage
notes  payable  totaling   $37,066,000  which  represented  4.2%  of  its  total
capitalization (based on book value, including minority interests and debt). The
weighted   average   interest   rate   for  the   mortgage   notes   is   7.67%.

         In August 1999, the Company  extended its unsecured line of credit (the
"Credit  Facility")  with Wells Fargo Bank. The Credit  Facility has a borrowing
limit of $100 million and an expiration  date of August 6, 2002.  The expiration
date may be extended  by one year on each  anniversary  of the Credit  Facility.
Interest on  outstanding  borrowings  is payable  monthly.  At the option of the
Company,  the rate of interest  charged is equal to (i) the prime rate or (ii) a
rate ranging from the London  Interbank  Offered  Rate  ("LIBOR")  plus 0.75% to
1.35% depending on the Company's credit ratings and coverage ratios,  as defined
(currently  LIBOR plus 1.00%).  In  addition,  the Company is required to pay an
annual commitment fee of 0.25%.

         The  Company  expects  to fund its  growth  strategies  with  permanent
capital,  including  issuances  of common  and  preferred  stock and  internally
generated retained cash flows. In addition, the Company may sell properties that
no longer meet its investment criteria.  The Company may finance acquisitions on
a temporary basis with  borrowings from its line of credit.  The Company intends
to repay amounts borrowed under the credit facility from undistributed cash flow
or, as market conditions  permit and as determined to be advantageous,  from the
public or private  placement of preferred and common stock or formation of joint
ventures.  The  Company  targets  a  leverage  ratio  of 40%  and a  Funds  From
Operations ("FFO") to combined fixed charges and preferred  distributions  ratio
of 3.0 to 1.0. As of December 31, 1999 and for the year then ended, the leverage
ratio was 24% and the FFO to combined fixed charges and preferred  distributions
coverage ratio was 7.4 to 1.0.

                                       28

<PAGE>

         In April 1999, the Company  completed a private  placement of preferred
OP units and a public  offering of  depositary  shares  representing  fractional
interest in perpetual  preferred stock resulting in net proceeds  totaling $65.6
million.  The net proceeds from the  placement of preferred OP units,  completed
April 23, 1999 were approximately  $12.5 million.  The preferred OP units have a
preferred  distribution rate of 8 7/8% on a stated value of $12.75 million.  The
preferred OP units have equivalent terms to those of perpetual  preferred stock.
Net proceeds from the public perpetual  preferred stock offering completed April
30, 1999 were $53.1 million.  The preferred  stock has a dividend rate of 9 1/4%
on a stated value of $55 million.  Proceeds from the issuances  were used to pay
off borrowings from an affiliate and a portion was used to repay a mortgage note
payable of  approximately  $11 million.  The  remaining  proceeds  were used for
investment in real estate.

         On September 3, 1999,  the  Operating  Partnership  completed a private
placement of 3,200,000  preferred units with a preferred  distribution rate of 8
3/4%. The net proceeds from the placement of preferred units were  approximately
$78  million.  A portion  of the  proceeds  was used to prepay a  mortgage  note
payable  of  approximately  $8.5  million.  On  September  7 and 23,  1999,  the
Operating  Partnership  completed  private  placements  of 1,200,000 and 400,000
preferred units, respectively, with a preferred distribution rate of 8 7/8%. The
net proceeds  from the  placement of preferred  units were  approximately  $39.2
million.  At December 31, 1999,  the Company had $74.2  million of proceeds from
these placements invested in short-term  interest bearing accounts.  The Company
will  evaluate  opportunities  to invest this capital in real estate assets over
the next year.

         In  January  1998,   the  Company   entered  into  an  agreement   with
institutional  investors whereby the Company agreed to issue 6,774,072 shares of
its  common  stock for cash  ($155  million)  in  separate  tranches.  The first
tranche,  representing  2,185,187  share or $50  million,  was issued in January
1998. The Company  incurred $2.4 million in costs  associated with the issuance.
The remainder of the common shares (4,588,885) was issued on May 6, 1998 and the
net proceeds ($105 million) were used to repay short-term borrowings.

         In May 1998, the Company completed two common stock offerings,  raising
net proceeds  totaling $118.9 million.  In the first offering,  the Company sold
4,000,000  shares of common stock to an underwriter,  resulting in approximately
$95.2 million of net proceeds. These shares were resold to various institutional
investors.  A portion of the  proceeds  was used to retire  debt  incurred  as a
result of a $190 million property  portfolio  acquisition.  In the second common
stock  offering,  the Company sold  1,025,800  common shares to an  underwriter,
resulting  in net  proceeds  of $23.7  million.  These  proceeds  were  used for
subsequent acquisitions of commercial properties.

         Funds  from  Operations:  FFO is  defined as net  income,  computed  in
accordance  with  generally  accepted  accounting  principles  ("GAAP"),  before
depreciation,  amortization,  minority  interest in income,  straight  line rent
adjustments and  extraordinary or non-recurring  items. FFO is presented because
the Company considers FFO to be a useful measure of the operating performance of
a REIT which,  together with net income and cash flows provides investors with a
basis to evaluate the operating and cash flow  performances  of a REIT. FFO does
not represent net income or cash flows from  operations as defined by GAAP.  FFO
does not take into consideration scheduled principal payments on debt or capital
improvements.  Accordingly, FFO is not necessarily a substitute for cash flow or
net income as a measure of liquidity or operating performance or ability to make
acquisitions and capital  improvements or ability to make  distributions or debt
principal  payments.  Also, FFO as computed and disclosed by the Company may not
be comparable to FFO computed and disclosed by other REITs.

         FFO for the Company is computed as follows:

<TABLE>
<CAPTION>

                                                                                      1999              1998
                                                                                 ---------------   ---------------

<S>                                                                              <C>               <C>
Net income allocable to common shareholders...............................         $37,849,000       $29,400,000
Extraordinary item, net of minority interest..............................             195,000                 -
Depreciation and amortization.............................................          29,762,000        18,908,000
Minority interest in income - common units................................          11,954,000        11,208,000
Effects of straight line rents............................................          (3,407,000)       (2,086,000)
                                                                                 ---------------   ---------------
Consolidated FFO allocable to common shareholders and minority interests..          76,353,000        57,430,000
FFO allocated to minority interests - common units........................         (18,248,000)      (15,852,000)
                                                                                 ---------------   ---------------
FFO allocated to common shareholders......................................         $58,105,000       $41,578,000
                                                                                 ===============   ===============

</TABLE>

                                       29
<PAGE>

         Capital  Expenditures:  During 1999, the Company incurred $11.7 million
or $1.01 per weighted average square foot in maintenance  capital  expenditures,
tenant  improvements  and  capitalized  leasing  commissions.  In addition,  the
Company made $3.2 million of renovation expenditures on two properties in Texas.
On a recurring  annual basis, the Company expects $0.90 to $1.20 per square foot
in recurring capital  expenditures ($11 - $15 million based on square footage at
December 31,  1999).  In addition,  the Company  expects to make $1.0 million in
renovations on a property in Southern California.

         During 1998,  the Company  incurred $10.6 million or $1.17 per weighted
average square foot in maintenance capital expenditures, tenant improvements and
capitalized leasing commissions.  In addition,  the Company made $0.5 million of
renovation expenditures.

         Distributions: The Company has elected and intends to qualify as a REIT
for federal income tax purposes.  In order to maintain its status as a REIT, the
Company must meet,  among other tests,  sources of income,  share  ownership and
certain asset tests.  As a REIT, the Company is not taxed on that portion of its
taxable income that is distributed  to its  shareholders  provided that at least
95% of its taxable income is distributed to its shareholders  prior to filing of
its tax return.

         The Board of  Directors  declared  a  quarterly  dividend  of $0.25 per
common  share  on March 2,  2000.  The  Board of  Directors  has  established  a
distribution  policy to maximize the  retention of cash flow.  In addition,  the
Board of Directors  declared a quarterly  dividend of $0.578125 per share on the
depositary  shares  each  represent  1/1,000  of a  share  of 9 1/4%  Cumulative
Preferred  Stock,  Series A.  Distributions  are  payable  on March 31,  2000 to
shareholders of record as of the close of business on March 15, 2000.

Impact of Year 2000 ("Y2K")
- ---------------------------

         The "Y2K Issue" arises because many computerized systems use two digits
rather than four to identify a year. Any of the Company's  computer  programs or
hardware with the Y2K issue that have date  sensitive  applications  or embedded
chips  could  recognize  a date using "00" as the year 1900 rather than the year
2000. The same issue has been faced by the Company's outside vendors,  including
those vendors in the banking and payroll  processing areas. Any failure in these
areas could result in disruptions of operations.

         As a result of the  Company's  assessment  and  remediation  activities
conducted in recent years, the Company experienced no significant disruptions in
its operations, and believes that its information systems responded successfully
to the Y2K date change.

         At this time,  the Company is not aware of any material  problems  that
resulted from the Y2K date change at any of its outside vendors, including those
vendors in the banking and payroll processing areas.

         The Company will continue to monitor its information  systems and those
of its outside  vendors  throughout  the year 2000 to ensure that any latent Y2K
Issues that may arise are addressed promptly.

         There can be no assurance that the Company has identified all potential
Y2K Issues  either  within the  Company's  information  systems,  at its outside
vendors or at external  agents.  In addition,  the impact of any  unresolved  or
unidentified Y2K Issues on governmental  entities and utility  providers and the
resulting  impact  upon  the  Company,  as well as  disruptions  in the  general
economy, may be material but cannot be reasonable determined or quantified.

                                       30
<PAGE>

ITEM 7A.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

         To limit the Company's exposure to market risk, the Company principally
finances its  operations and growth with  permanent  equity  capital  consisting
either of common or preferred stock. At December 31, 1999, the Company's debt as
a percentage of shareholders' equity (based on book values) was 6.7%.

         The Company's market risk sensitive  instruments include mortgage notes
payable which totaled $37,066,000 at December 31, 1999. Substantially all of the
Company's mortgage notes payable bear interest at fixed rates. See Note 7 of the
Notes to Consolidated Financial Statements for terms, valuations and approximate
principal  maturities  of the  mortgage  notes  payable as of December 31, 1999.
Based on borrowing rates currently available to the Company, the carrying amount
of debt approximates fair value.

ITEM 8.   FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

         The  financial  statements  of the Company  (AOPP for periods  prior to
March 17, 1998) at December  31, 1999 and 1998 and for the years ended  December
31, 1999 and 1998,  the period from April 1, 1997 through  December 31, 1997 and
the period from January 1, 1997 through March 31, 1997 and the report of Ernst &
Young LLP,  Independent  Auditors,  thereon and the related financial  statement
schedule,  are  included  elsewhere  herein.  Reference  is made to the Index of
Financial Statements and Schedule in Item 14.

ITEM 9.   CHANGES   IN   AND  DISAGREEMENTS  WITH  ACCOUNTANTS ON ACCOUNTING AND
          FINANCIAL DISCLOSURE

         Not Applicable.


                                       31
<PAGE>


                                    PART III
                                    --------

ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

         The  information  required by this item with  respect to  directors  is
hereby  incorporated  by reference to the  material  appearing in the  Company's
definitive   proxy   statement  to  be  filed  in  connection  with  the  annual
shareholders'  meeting  to be held in 2000  (the  "Proxy  Statement")  under the
caption "Election of Directors."  Information required by this item with respect
to  executive  officers is provided in Item 4A of this  report.  See  "Executive
Officers."

ITEM 11.  EXECUTIVE COMPENSATION

         The  information  required  by this  item  is  hereby  incorporated  by
reference to the material  appearing in the Proxy  Statement  under the captions
"Compensation"    and   "Compensation    Committee    Interlocks   and   Insider
Participation."

ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

         The  information  required  by this  item  is  hereby  incorporated  by
reference to the material  appearing in the Proxy  Statement  under the captions
"Election  of  Directors-Security  Ownership of Certain  Beneficial  Owners" and
"-Security Ownership of Management."

ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

         The  information  required  by this  item  is  hereby  incorporated  by
reference to the material  appearing  in the Proxy  Statement  under the caption
"Compensation    Committee   Interlocks   and   Insider    Participation-Certain
Relationships and Related Transactions."

                                       32
<PAGE>


                                     PART IV
                                     -------

ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULE AND REPORTS ON FORM 8-K

a.    1.  Financial Statements

      The financial  statements  listed in the  accompanying  Index to Financial
      Statements and Schedule hereof are filed as part of this report.

      2.  Financial Statements Schedule

      The financial  statements  schedule  listed in the  accompanying  Index to
      Financial Statements and Schedule are filed as part of this report.

      3.  Exhibits

      See Index to Exhibits contained herein.

b.    Reports on Form 8-K

      The Company  filed a Current  Report on Form 8-K dated  December  30, 1999
      (filed January 10, 2000), as amended by Form 8-K/A dated December 30, 1999
      (filed March 13, 2000) pursuant to Item 5, which filed Combined Statements
      of  Certain  Revenues  and  Certain  Expenses  for  the   Monroe/Lafayette
      Properties  for the nine months ended  September 30, 1999 and for the year
      ended  December  31, 1998,  Combined  Statements  of Certain  Revenues and
      Certain  Expenses  for the  Kohm  Properties  for the  nine  months  ended
      September 30, 1999 and for the year ended December 31, 1998, Statements of
      Certain  Revenues  and  Certain  Operating  Expenses  for the  Northpointe
      Property  for the nine months  ended  September  30, 1999 and for the year
      ended  December 31, 1998 and Combined  Statements of Certain  Revenues and
      Certain  Operating  Expenses  for the R&B  Properties  for the nine months
      ended September 30, 1999 and for the year ended December 31, 1998.

c.    Exhibits

      See Index to Exhibits contained herein.

d.    Financial Statement Schedules

      Not applicable.

                                       33
<PAGE>


                             PS BUSINESS PARKS, INC.
                                  EXHIBIT INDEX
                                  (Item 14(c))

 2.1    Amended  and  Restated  Agreement  and  Plan  of  Reorganization   among
        Registrant,  American Office Park Properties,  Inc.  ("AOPP") and Public
        Storage,  Inc.  ("PSI")  dated  as of  December  17,  1997.  Filed  with
        Registrant's  Registration  Statement  No.  333-45405  and  incorporated
        herein by reference.

 3.1    Restated Articles of Incorporation. Filed with Registrant's Registration
        Statement No. 333-78627 and incorporated herein by reference.

 3.2    Certificate of Determination of Preferences of 81/4% Series C Cumulative
        Redeemable  Preferred  Stock  of PS  Business  Parks,  Inc.  Filed  with
        Registrant's  Quarterly  Report  on Form 10-Q for the  quarterly  period
        ended September 30, 1999 and incorporated herein by reference.

 3.3    Certificate  of   Determination  of  Preferences  of  8  7/8%  Series  X
        Cumulative  Redeemable  Preferred Stock of PS Business Parks, Inc. Filed
        with Registrant's Quarterly Report on Form 10-Q for the quarterly period
        ended September 30, 1999 and incorporated herein by reference.

 3.4    Amendment to  Certificate  of  Determination  of  Preferences  of 8 7/8%
        Series X Cumulative  Redeemable  Preferred  Stock of PS Business  Parks,
        Inc.  Filed  with  Registrant's  Quarterly  Report  on Form 10-Q for the
        quarterly  period ended  September 30, 1999 and  incorporated  herein by
        reference.

 3.5    Restated  Bylaws.  Filed with  Registrant's  Current  Report on Form 8-K
        dated March 17, 1998 and incorporated herein by reference.

 10.1   Amended Management  Agreement between Storage Equities,  Inc. and Public
        Storage Commercial Properties Group, Inc. dated as of February 21, 1995.
        Filed with PSI's Annual Report on Form 10-K for the year ended  December
        31, 1994 and incorporated herein by reference.

 10.2   Registrant's   1997  Stock  Option  and  Incentive   Plan.   Filed  with
        Registrant's  Registration  Statement  No.  333-48313  and  incorporated
        herein by reference.

 10.3   Agreement of Limited  Partnership of PS Business Parks,  L.P. Filed with
        Registrant's  Quarterly  Report  on Form 10-Q for the  quarterly  period
        ended June 30, 1998 and incorporated herein by reference.

 10.4   Merger and  Contribution  Agreement  dated as of December 23, 1997 among
        Acquiport Two Corporation,  Acquiport Three Corporation,  New York State
        Common Retirement Fund, American Office Park Properties,  L.P., AOPP and
        AOPP  Acquisition  Corp.  Three.  Filed with  Registrant's  Registration
        Statement No. 333-45405 and incorporated herein by reference.

 10.5   Agreement Among  Shareholders  and Company dated as of December 23, 1997
        among Acquiport Two Corporation,  AOPP, American Office Park Properties,
        L.P.  and  PSI.  Filed  with  Registrant's  Registration  Statement  No.
        333-45405 and incorporated herein by reference.

 10.6   Amendment  to  Agreement  Among  Shareholders  and  Company  dated as of
        January 21, 1998 among Acquiport Two Corporation,  AOPP, American Office
        Park  Properties,  L.P. and PSI.  Filed with  Registrant's  Registration
        Statement No. 333-45405 and incorporated herein by reference.

 10.7   Non-Competition Agreement dated as of December 23, 1997 among PSI, AOPP,
        American  Office Park  Properties,  L.P. and Acquiport Two  Corporation.
        Filed  with  Registrant's   Registration  Statement  No.  333-45405  and
        incorporated herein by reference.

 10.8   Employment  Agreement between AOPP and Ronald L. Havner, Jr. dated as of
        December 23, 1997. Filed with  Registrant's  Registration  Statement No.
        333-45405 and incorporated herein by reference.

                                       34
<PAGE>

 10.9   Employment Agreement between Registrant and J. Michael Lynch dated as of
        May 20, 1998. Filed with Registrant's  Quarterly Report on Form 10-Q for
        the  quarterly  period  ended June 30, 1998 and  incorporated  herein by
        reference.

 10.10  Common Stock Purchase  Agreement dated as of January 23, 1998 among AOPP
        and  the   Investors   signatory   thereto.   Filed  with   Registrant's
        Registration   Statement  No.  333-45405  and  incorporated   herein  by
        reference.

 10.11  Registration  Rights  Agreement  dated as of January 30, 1998 among AOPP
        and  the   Investors   signatory   thereto.   Filed  with   Registrant's
        Registration   Statement  No.  333-45405  and  incorporated   herein  by
        reference.

 10.12  Registration  Rights  Agreement  dated  as of  March  17,  1998  between
        Registrant and Acquiport Two Corporation ("Acquiport Registration Rights
        Agreement").  Filed with Registrant's  Quarterly Report on Form 10-Q for
        the  quarterly  period  ended June 30, 1998 and  incorporated  herein by
        reference.

 10.13  Letter  dated May 20, 1998  relating to  Acquiport  Registration  Rights
        Agreement. Filed with Registrant's Quarterly Report on Form 10-Q for the
        quarterly  period  ended  June  30,  1998  and  incorporated  herein  by
        reference.

 10.14  Revolving Credit Agreement dated August 6, 1998 among PS Business Parks,
        L.P., Wells Fargo Bank, National Association,  as Agent, and the Lenders
        named therein. Filed with Registrant's Quarterly Report on Form 10-Q for
        the  quarterly  period  ended June 30, 1998 and  incorporated  herein by
        reference.

 10.15  First  Amendment to Revolving  Credit  Agreement  dated as of August 19,
        1999  among  PS  Business  Parks,  L.P.,  Wells  Fargo  Bank,   National
        Association,  as  Agent,  and the  Lenders  named  therein.  Filed  with
        Registrant's  Quarterly  Report  on Form 10-Q for the  quarterly  period
        ended September 30, 1999 and incorporated herein by reference.

 10.16  Form of Indemnity Agreement. Filed with Registrant's Quarterly Report on
        Form 10-Q for the quarterly period ended March 31, 1998 and incorporated
        herein by reference.

 10.17  Cost Sharing and Administrative  Services Agreement dated as of November
        16, 1995 by and among PSCC,  Inc. and the owners listed  therein.  Filed
        with Registrant's Quarterly Report on Form 10-Q for the quarterly period
        ended March 31, 1998 and incorporated herein by reference.

 10.18  Amendment to Cost Sharing and Administrative Services Agreement dated as
        of  January  2, 1997 by and  among  PSCC,  Inc.  and the  owners  listed
        therein.  Filed with Registrant's  Quarterly Report on Form 10-Q for the
        quarterly  period  ended  March  31,  1998 and  incorporated  herein  by
        reference.

 10.19  Accounts Payable and Payroll Disbursement Services Agreement dated as of
        January 2, 1997 by and  between  PSCC,  Inc.  and  American  Office Park
        Properties,  L.P. Filed with Registrant's  Quarterly Report on Form 10-Q
        for the quarterly period ended March 31, 1998 and incorporated herein by
        reference.

 10.20  Amendment to Agreement of Limited Partnership of PS Business Parks, L.P.
        Relating to 8 7/8% Series B Cumulative Redeemable Preferred Units, dated
        as of April 23, 1999. Filed with  Registrant's  Quarterly Report on Form
        10-Q for the  quarterly  period  ended March 31,  1999 and  incorporated
        herein by reference.

 10.21  Amendment to Agreement of Limited Partnership of PS Business Parks, L.P.
        Relating to 9 1/4% Series A Cumulative Redeemable Preferred Units, dated
        as of April 30, 1999. Filed with  Registrant's  Quarterly Report on Form
        10-Q for the  quarterly  period  ended March 31,  1999 and  incorporated
        herein by reference.

 10.22  Amendment to Agreement of Limited Partnership of PS Business Parks, L.P.
        Relating to 8 1/4% Series C Cumulative Redeemable Preferred Units, dated
        as of September 3, 1999.  Filed with  Registrant's  Quarterly  Report on
        Form  10-Q  for the  quarterly  period  ended  September  30,  1999  and
        incorporated herein by reference.

                                       35
<PAGE>

 10.23  Amendment to Agreement of Limited Partnership of PS Business Parks, L.P.
        Relating to 8 7/8% Series X Cumulative Redeemable Preferred Units, dated
        as of September 7, 1999.  Filed with  Registrant's  Quarterly  Report on
        Form  10-Q  for the  quarterly  period  ended  September  30,  1999  and
        incorporated herein by reference.

 10.24  Amendment to Agreement of Limited Partnership of PS Business Parks, L.P.
        Relating to Additional 8 7/8% Series X Cumulative  Redeemable  Preferred
        Units, dated as of September 23, 1999. Filed with Registrant's Quarterly
        Report on Form 10-Q for the  quarterly  period ended  September 30, 1999
        and incorporated herein by reference.

 11     Statement re: Computation of Earnings per Share. Filed herewith.

 12     Statement re:  Computation of Ratio of Earnings to Fixed Charges.  Filed
        herewith.

 23     Consent of Independent Auditors. Filed herewith.

 27     Financial Data Schedule. Filed herewith.


                                       36
<PAGE>


                                   SIGNATURES

         Pursuant to the  requirements  of Section 13 or 15(d) 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.

                                                  Dated:  March 29, 2000

                                                  PS BUSINESS PARKS, INC.

                                                  BY: /s/ Ronald L. Havner, Jr.
                                                      -------------------------
                                                      Ronald L. Havner, Jr.
                                                      President, Chairman of the
                                                      Board  and Chief Executive
                                                      Officer


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
this  report has been  signed  below by the  following  persons on behalf of the
registrant and in the capacities and on the dates indicated.

<TABLE>
<CAPTION>


               Signature                                 Title                                  Date
- -------------------------------------------------------------------------------------------------------------------
<S>                                      <C>                                              <C>
                                         President,  Chairman of the Board and
/s/ Ronald L. Havner, Jr.                Chief  Executive  Officer  (principal
- -------------------------                executive officer)
Ronald L. Havner, Jr.                                                                      March 29, 2000

                                         Vice  President  and Chief  Financial
/s/ Jack E. Corrigan                     Officer (principal  financial officer
- --------------------                     and principal accounting officer)
Jack E. Corrigan                                                                           March 29, 2000

/s/ Harvey Lenkin
- -----------------
Harvey Lenkin                            Director                                          March 29, 2000

/s/ Vern O. Curtis
- ------------------
Vern O. Curtis                           Director                                          March 29, 2000

/s/ James H. Kropp
- ------------------
James H. Kropp                           Director                                          March 29, 2000

/s/ Jack D. Steele
- ------------------
Jack D. Steele                           Director                                          March 29, 2000

/s/ Alan K. Pribble
- -------------------
Alan K. Pribble                          Director                                          March 29, 2000

/s/ Arthur M. Friedman
- ----------------------
Arthur M. Friedman                       Director                                          March 29, 2000

</TABLE>


                                       37
<PAGE>


                             PS BUSINESS PARKS, INC.

            INDEX TO CONSOLIDATED FINANCIAL STATEMENTS AND SCHEDULES

                         (Item 14(a)(3) and Item 14(c))


<TABLE>
<CAPTION>
                                                                                                         Page
<S>                                                                                                      <C>
Report of Independent Auditors..............................................................             F-1

Consolidated balance sheets as of December 31, 1999 and 1998................................             F-2

Consolidated  statements  of income for  the  years ended  December 31, 1999  and 1998,  the
period from April 1, 1997  through  December 31, 1997  and the  period  from January 1, 1997
through March 31, 1997......................................................................             F-3

Consolidated  statement of shareholders' equity  for  the  years ended December 31, 1999 and
1998, the period from April 1, 1997  through  December  31, 1997 and the period from January
1, 1997 through March 31, 1997 .............................................................             F-4

Consolidated  statements  of cash flows for the years ended  December 31, 1999 and 1998, the
period from  April 1, 1997  through December 31, 1997 and  the period  from  January 1, 1997
through March 31, 1997 .....................................................................             F-5

Notes to consolidated financial statements..................................................             F-7

Schedule:

III - Real estate and accumulated depreciation..............................................             F-22


</TABLE>


All other  schedules  have been omitted  since the required  information  is not
present or not  present  in amounts  sufficient  to  require  submission  of the
schedule,  or because the information  required is included in the  consolidated
financial statements or notes thereto.


                                       38
<PAGE>


                         REPORT OF INDEPENDENT AUDITORS



To the Board of Directors and Shareholders
PS Business Parks, Inc.


We have  audited the  accompanying  consolidated  balance  sheets of PS Business
Parks,  Inc. as of  December  31,  1999 and 1998,  and the related  consolidated
statements  of income,  shareholders'  equity and cash flows for the years ended
December 31, 1999 and 1998,  the period from April 1, 1997 through  December 31,
1997 and the period from January 1, 1997 through March 31, 1997. Our audits also
included the  financial  statement  schedule  listed in the Index at Item 14(a).
These   financial   statements   and  financial   statement   schedule  are  the
responsibility of the Company's management.  Our responsibility is to express an
opinion on these financial  statements and financial statement schedule 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  consolidated   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 consolidated  financial statements referred to above present
fairly,  in all material  respects,  the consolidated  financial  position of PS
Business Parks, Inc. at December 31, 1999 and 1998, and the consolidated results
of its  operations  and its cash flows for the years ended December 31, 1999 and
1998,  the period from April 1, 1997  through  December  31, 1997 and the period
from  January 1, 1997  through  March 31,  1997 in  conformity  with  accounting
principles  generally accepted in the United States.  Also, in our opinion,  the
related financial statement  schedule,  when considered in relation to the basic
financial statements taken as a whole,  presents fairly in all material respects
the information set forth therein.


                                                           /s/ ERNST & YOUNG LLP



Los Angeles, California
January 31, 2000


                                       F-1
<PAGE>


                             PS BUSINESS PARKS, INC.
                           CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>

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

                                     ASSETS
                                     ------
<S>                                                                             <C>                    <C>
Cash and cash equivalents................................................       $    74,220,000         $     6,068,000

Real estate facilities, at cost:
     Land................................................................           194,140,000             176,241,000
     Buildings and equipment.............................................           636,261,000             536,697,000
                                                                                ---------------------   ------------------
                                                                                    830,401,000             712,938,000
     Accumulated depreciation............................................           (50,976,000)            (22,517,000)
                                                                                ---------------------   ------------------
                                                                                    779,425,000             690,421,000
Properties held for disposition, net.....................................            14,235,000                       -
Construction in progress.................................................             8,616,000               7,716,000
                                                                                ---------------------   ------------------
                                                                                    802,276,000             698,137,000

Receivables..............................................................               771,000                 242,000
Deferred rent receivables................................................             5,493,000               2,086,000
Intangible assets, net...................................................             1,282,000               1,583,000
Other assets.............................................................            19,699,000               1,298,000
                                                                                ---------------------   ------------------
              Total assets...............................................       $   903,741,000         $   709,414,000
                                                                                =====================   ==================

</TABLE>


                      LIABILITIES AND SHAREHOLDERS' EQUITY
                      ------------------------------------

<TABLE>
<CAPTION>

<S>                                                                             <C>                     <C>
Accrued and other liabilities............................................       $    21,195,000         $    15,953,000
Line of credit...........................................................                     -              12,500,000
Mortgage notes payable...................................................            37,066,000              38,041,000
                                                                                ---------------------   ------------------
     Total liabilities...................................................            58,261,000              66,494,000

Minority interest:
     Preferred units.....................................................           132,750,000                       -
     Common units........................................................           157,199,000             153,015,000

Shareholders' equity:
     Preferred  stock,  $0.01 par  value, 50,000,000  shares  authorized,
         2,200  shares  issued  and  outstanding  at  December  31,  1999
         (none issued or outstanding at December 31, 1998)...............           55,000,000                       -
     Common  stock,  $0.01  par  value,   100,000,000  shares authorized,
         23,645,461   shares   issued  and  outstanding  at  December 31,
         1999,  (23,635,650  shares  issued and  outstanding at  December
         31, 1998).......................................................               236,000                 236,000
      Paid-in capital....................................................           478,889,000             482,471,000
      Cumulative net income..............................................            73,809,000              32,554,000
      Cumulative distributions...........................................           (52,403,000)            (25,356,000)
                                                                                ---------------------   ------------------
         Total shareholders' equity......................................           555,531,000             489,905,000
                                                                                ---------------------   ------------------
              Total liabilities and shareholders' equity.................       $   903,741,000         $   709,414,000
                                                                                =====================   ==================

</TABLE>

                            See accompanying notes.
                                      F-2
<PAGE>


                             PS BUSINESS PARKS, INC.
                        CONSOLIDATED STATEMENTS OF INCOME


<TABLE>
<CAPTION>

                                                              For the Year Ended
                                                                 December 31,                 For the Periods (Note 2)
                                                        --------------------------------  -----------------------------------
                                                                                           April 1, 1997     January 1, 1997
                                                                                              through            through
                                                             1999             1998        December 31, 1997   March 31, 1997
                                                        --------------    --------------  -----------------  ----------------
<S>                                                     <C>                <C>            <C>                <C>
Revenues:
  Rental income.....................................     $125,327,000      $ 88,320,000     $ 24,364,000      $  5,805,000
  Facility management fees from affiliates..........          471,000           529,000          709,000           247,000
  Interest and other income.........................        2,815,000         1,411,000          424,000            29,000
                                                        --------------    --------------  -----------------  ----------------
                                                          128,613,000        90,260,000       25,497,000         6,081,000
                                                        --------------    --------------  -----------------  ----------------
Expenses:
  Cost of operations................................       34,891,000        26,073,000        9,837,000         2,493,000
  Cost of facility management.......................           94,000            77,000          129,000            60,000
  Depreciation and amortization.....................       29,762,000        18,908,000        4,375,000           820,000
  General and administrative........................        3,153,000         2,233,000        1,248,000           213,000
  Interest expense..................................        3,153,000         2,361,000            1,000                 -
                                                        --------------    --------------  -----------------  ----------------
                                                           71,053,000        49,652,000       15,590,000         3,586,000
                                                        --------------    --------------  -----------------  ----------------
Income before minority interest and extraordinary
   item............................................        57,560,000        40,608,000        9,907,000         2,495,000

  Minority interest in income - preferred units.....       (4,156,000)                -                -                 -
  Minority interest in income - common units........      (11,954,000)      (11,208,000)      (6,753,000)       (1,813,000)
                                                        --------------    --------------  -----------------  ----------------
Income before extraordinary item....................       41,450,000        29,400,000        3,154,000           682,000

  Extraordinary loss on early extinguishment of
   debt, net of minority interest...................         (195,000)                -                -                 -
                                                        --------------    --------------  -----------------  ----------------
Net income..........................................     $ 41,255,000      $ 29,400,000     $  3,154,000      $    682,000
                                                        ==============    ==============  =================  ================
Net income allocation:
   Allocable to preferred shareholders..............     $  3,406,000      $          -     $          -      $          -
   Allocable to common shareholders.................       37,849,000        29,400,000        3,154,000           682,000
                                                        --------------    --------------  -----------------  ----------------
                                                         $ 41,255,000      $ 29,400,000     $  3,154,000      $    682,000
                                                        ==============    ==============  =================  ================
Net income per common share - basic:
   Income before extraordinary item.................     $       1.61      $       1.52     $       0.92      $       0.31
   Extraordinary loss, net of minority interest.....            (0.01)               -                -                 -
                                                        --------------    --------------  -----------------  ----------------
   Net income.......................................     $       1.60      $       1.52     $       0.92      $       0.31
                                                        ==============    ==============  =================  ================


Net income per common share - diluted:
   Income before extraordinary item.................     $       1.61      $       1.51     $       0.92      $       0.31
   Extraordinary loss, net of minority interest.....            (0.01)               -                -                 -
                                                        --------------    --------------  -----------------  ----------------
   Net income.......................................     $       1.60      $       1.51     $       0.92      $       0.31
                                                        ==============    ==============  =================  ================


 Weighted average common shares outstanding:

   Basic............................................       23,641,000        19,361,000        3,414,000         2,193,000
                                                        ==============    ==============  =================  ================
   Diluted..........................................       23,709,000        19,429,000        3,426,000         2,193,000
                                                        ==============    ==============  =================  ================

</TABLE>

                            See accompanying notes.
                                      F-3

<PAGE>

                             PS BUSINESS PARKS, INC.
                 CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY
<TABLE>
<CAPTION>
                                                           Preferred Stock                 Common Stock
                                                      ---------------------------   ---------------------------
                                                         Shares          Amount        Shares         Amount      Paid-in Capital
                                                      -------------  ------------   ------------   ------------   ---------------
<S>                                                   <C>            <C>            <C>            <C>            <C>
Balances at December 31, 1996...................          899,608         9,000          94,697         1,000          1,573,000
   Issuance of  preferred  stock in exchange for
     real estate facilities.....................        1,198,680        12,000               -             -         19,988,000
   Net income...................................                -             -               -             -                  -
   Issuance of common stock for cash............                -             -           4,797             -             80,000
   Adjustment  to   reflect   cost    of   PSI's
     investment in PSB .........................                -             -               -             -         13,194,000
   Exchange of  preferred stock for common stock       (2,098,288)      (21,000)      2,098,288        21,000                  -
   Adjustment to reflect  minority  interest  to
     underlying ownership interest  ............                -             -               -             -          1,813,000
                                                      -------------  ------------   ------------   ------------   ---------------
Balances at March 31, 1997......................                -             -       2,197,782        22,000         36,648,000
   Issuance of common stock for cash............                -             -       2,025,769        20,000         33,780,000
   Issuance of common stock in exchange for real
     estate facilities..........................                -             -       3,504,758        35,000         75,939,000
   Net income...................................                -             -               -             -                  -
   Distributions paid...........................                -             -               -             -                  -
   Adjustment to reflect  minority  interest  to
     underlying ownership interest..............                -             -               -             -         (3,090,000)
                                                      -------------  ------------   ------------   ------------   ---------------
Balances at December 31, 1997...................                -             -       7,728,309        77,000        143,277,000
   Issuance of common stock:
       Conversion of OP units...................                -             -       1,785,007        18,000         33,005,000
       Private offerings, net of costs..........                -             -       6,774,072        68,000        152,533,000
       Exercise of stock options................                -             -          39,024             -            651,000
       In connection with a business combination                -             -       2,283,438        23,000         46,787,000
       Public offerings, net of costs...........                -             -       5,025,800        50,000        118,810,000
   Net income...................................                -             -               -             -                  -
   Distributions paid...........................                -             -               -             -                  -
   Adjustment  to  reflect  minority interest to
     underlying ownership interest..............                -             -               -             -        (12,592,000)
                                                      -------------  ------------   ------------   ------------   ---------------
Balances at December 31, 1998...................                -             -      23,635,650       236,000        482,471,000
   Issuance of preferred stock, net of costs....            2,200    55,000,000               -             -         (1,936,000)
   Issuance of common stock.....................                -             -           9,811             -            179,000
   Net income...................................                -             -               -             -                  -
   Distributions paid:
       Preferred stock..........................                -             -               -             -                  -
       Common stock.............................                -             -               -             -                  -
   Adjustment  to  reflect  minority interest to
     underlying ownership interest..............                -             -               -             -         (1,825,000)
                                                      -------------  ------------   ------------   ------------   ---------------
Balances at December 31, 1999...................            2,200    $55,000,000     23,645,461    $  236,000     $  478,889,000
                                                      =============  ============   ============   ============   ===============
</TABLE>
<TABLE>
<CAPTION>
                                                       Cumulative     Cumulative       Shareholders'
                                                       Net Income    Distributions        Equity
                                                      -------------  --------------   ---------------
<S>                                                   <C>            <C>              <C>
Balances at December 31, 1996...................          151,000                -         1,734,000
   Issuance of  preferred  stock in exchange for
     real estate facilities.....................                -                -        20,000,000
   Net income...................................          682,000                -           682,000
   Issuance of common stock for cash............                -                -            80,000
   Adjustment  to   reflect   cost    of   PSI's
     investment in PSB .........................         (833,000)               -        12,361,000
   Exchange of  preferred stock for common stock                -                -                 -
   Adjustment to reflect  minority  interest  to
     underlying ownership interest  ............                -                -         1,813,000
                                                      -------------  --------------   ---------------
Balances at March 31, 1997......................                -                -        36,670,000
   Issuance of common stock for cash............                -                -        33,800,000
   Issuance of common stock in exchange for real
     estate facilities..........................                -                -        75,974,000
   Net income...................................        3,154,000                -         3,154,000
   Distributions paid...........................                -       (3,550,000)       (3,550,000)
   Adjustment to reflect  minority  interest  to
     underlying ownership interest..............                -                -        (3,090,000)
                                                      -------------  --------------   ---------------
Balances at December 31, 1997...................        3,154,000       (3,550,000)      142,958,000
   Issuance of common stock:
       Conversion of OP units...................                -                -        33,023,000
       Private offerings, net of costs..........                -                -       152,601,000
       Exercise of stock options................                -                -           651,000
       In connection with a business combination                -                -        46,810,000
       Public offerings, net of costs...........                -                -       118,860,000
   Net income...................................       29,400,000                -        29,400,000
   Distributions paid...........................                -      (21,806,000)      (21,806,000)
   Adjustment  to  reflect  minority interest to
     underlying ownership interest..............                -                -       (12,592,000)
                                                      -------------  --------------   ---------------
Balances at December 31, 1998...................       32,554,000      (25,356,000)      489,905,000
   Issuance of preferred stock, net of costs....                -                -        53,064,000
   Issuance of common stock.....................                -                -           179,000
   Net income...................................       41,255,000                -        41,255,000
   Distributions paid:
       Preferred stock..........................                -       (3,406,000)       (3,406,000)
       Common stock.............................                -      (23,641,000)      (23,641,000)
   Adjustment  to  reflect  minority interest to
     underlying ownership interest..............                -                -        (1,825,000)
                                                      -------------  --------------   ---------------
Balances at December 31, 1999...................      $73,809,000    $ (52,403,000)    $ 555,531,000
                                                      =============  ==============   ===============
</TABLE>

                            See accompanying notes.
                                      F-4
<PAGE>


                             PS BUSINESS PARKS, INC.
                      CONSOLIDATED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                                                           For the Periods (Note 2)
                                                                                                         ---------------------------
                                                                         For the Year     For the Year   April 1, 1997    January 1,
                                                                            Ended           Ended           through     1997 through
                                                                         December 31,     December 31,     December 31,   March 31,
                                                                            1999             1998             1997          1997
                                                                         ------------    -------------   -------------  ------------
<S>                                                                      <C>             <C>             <C>            <C>
Cash flows from operating activities:
   Net income........................................................    $ 41,255,000    $ 29,400,000    $  3,154,000   $   682,000
   Adjustments   to  reconcile  net  income  to  net  cash   provided
     by operating activities:
       Depreciation and amortization expense.........................      29,762,000      18,908,000       4,375,000       820,000
       Minority interest in income...................................      16,049,000      11,208,000       6,753,000     1,813,000
       Increase in receivables and other assets......................      (3,868,000)     (1,913,000)     (1,465,000)     (400,000)
       Increase in accrued and other liabilities.....................       5,242,000       2,625,000         780,000     2,925,000
                                                                         ------------    -------------   -------------  ------------
            Total adjustments........................................      47,185,000      30,828,000      10,443,000     5,158,000
                                                                         ------------    -------------   -------------  ------------
         Net cash provided by operating activities...................      88,440,000      60,228,000      13,597,000     5,840,000
                                                                         ------------    -------------   -------------  ------------
Cash flows from investing activities:
       Other investments.............................................     (18,470,000)              -               -             -
       Acquisition of real estate facilities.........................     (82,087,000)   (289,415,000)    (44,122,000)            -
       Acquisition cost of business combination......................               -        (424,000)              -             -
       Construction in progress......................................     (14,550,000)     (7,716,000)              -             -

       Capital improvements to real estate facilities................     (16,211,000)    (11,091,000)     (2,983,000)     (582,000)
                                                                         ------------    -------------   -------------  ------------
         Net cash used in investing activities.......................    (131,318,000)   (308,646,000)    (47,105,000)     (582,000)
                                                                         ------------    -------------   -------------  ------------
Cash flows from financing activities:
       Borrowings from an affiliate..................................      41,400,000     179,000,000       3,500,000             -
       Repayment of borrowings from an affiliate.....................     (41,400,000)   (182,500,000)              -             -
       Borrowings from line of credit................................      14,000,000      12,500,000               -             -
       Repayment of borrowings from line of credit...................     (26,500,000)              -               -             -
       Principal payments on mortgage notes payable..................     (20,694,000)       (606,000)              -             -
       Decrease (increase) in receivable from affiliate..............               -               -       1,135,000      (308,000)
       Net proceeds from the issuance of common stock................         179,000     272,112,000      33,800,000        80,000
       Net proceeds from the issuance of preferred stock.............      53,064,000               -               -             -
       Net  proceeds from  the   issuance  of   preferred   operating
         partnership units...........................................     129,613,000               -               -             -
       Distributions paid to preferred shareholders..................      (3,406,000)              -               -             -
       Distributions paid to minority interests - preferred units....      (4,156,000)              -               -             -
       Distributions paid to common shareholders.....................     (23,641,000)    (21,806,000)     (3,550,000)            -
       Distributions paid to minority interests - common units.......      (7,429,000)     (8,098,000)     (3,442,000)            -
                                                                         ------------    -------------   -------------  ------------
         Net cash provided by (used in) financing activities.........     111,030,000     250,602,000      31,443,000      (228,000)
                                                                         ------------    -------------   -------------  ------------

Net increase (decrease) in cash and cash equivalents.................      68,152,000       2,184,000      (2,065,000)    5,030,000
Cash and cash equivalents at the beginning of the period.............       6,068,000       3,884,000       5,949,000       919,000
                                                                         ------------    -------------   -------------  ------------
Cash and cash equivalents at the end of the period...................    $ 74,220,000    $  6,068,000    $  3,884,000   $ 5,949,000
                                                                         ============    =============   =============  ============
Supplemental disclosures:
        Interest paid................................................    $  3,053,000    $  2,629,000    $      1,000   $         -
                                                                         ============    =============   =============  ============

</TABLE>

                            See accompanying notes.
                                      F-5
<PAGE>

                             PS BUSINESS PARKS, INC.
                      CONSOLIDATED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                                                           For the Periods (Note 2)
                                                                                                         ---------------------------
                                                                         For the Year    For the Year   April 1, 1997    January 1,
                                                                            Ended          Ended           through     1997 through
                                                                         December 31,    December 31,    December 31,    March 31,
                                                                            1999            1998            1997           1997
                                                                         ------------   -------------  -------------  --------------
<S>                                                                      <C>            <C>            <C>            <C>
Supplemental schedule of non cash investing and financial activities:
   Acquisitions of real estate facilities and associated assets  and
     liabilities in exchange for preferred stock, minority interest,
     and mortgage notes payable:
       Real estate facilities........................................    $(20,752,000)  $(44,592,000)  $(146,207,000) $(117,180,000)
       Other assets (deposits on real estate acquisitions)...........               -        800,000               -              -
       Accrued and other liabilities.................................               -      3,531,000       4,419,000              -
       Minority interest - common units..............................       1,033,000      1,614,000      65,084,000     97,180,000
       Preferred stock...............................................               -              -               -         12,000
       Common stock..................................................               -              -          35,000              -
       Paid-in capital...............................................               -              -      75,939,000     19,988,000
       Mortgage notes payable........................................      19,719,000     38,647,000               -              -
       Intangible assets.............................................               -              -         730,000              -


   Business combination:
       Real estate facilities........................................               -    (48,305,000)              -              -
       Other assets..................................................               -       (452,000)              -              -
       Accrued and other liabilities.................................               -      1,523,000               -              -
       Common stock..................................................               -         23,000               -              -
       Paid-in capital...............................................               -     46,787,000               -              -


   Conversion of OP units into shares of common stock:
       Minority interest - common units..............................               -    (33,023,000)              -              -
       Common stock..................................................               -         18,000               -              -
       Paid-in capital...............................................               -     33,005,000               -              -

   Adjustment to reflect minority interest to underlying ownership
     interest:
       Minority interest.............................................       1,825,000     12,592,000       3,090,000     (1,813,000)
       Paid-in capital...............................................      (1,825,000)   (12,592,000)     (3,090,000)     1,813,000

   Exchange of preferred stock for common stock:
       Preferred stock...............................................               -              -               -        (21,000)
       Common stock..................................................               -              -               -         21,000

   Adjustment to acquisition cost (see Note 2):
       Real estate facilities........................................               -     (1,315,000)              -     (7,145,000)
       Accumulated depreciation......................................               -              -               -       (820,000)
       Intangible assets.............................................               -      1,315,000               -     (4,395,000)
       Paid-in capital...............................................               -              -               -     13,194,000
       Cumulative net income.........................................               -              -               -       (833,000)

   Capitalization of developed projects:
       Real estate facilities........................................      13,650,000              -               -              -
       Construction in progress......................................     (13,650,000)             -               -              -




</TABLE>

                            See accompanying notes.
                                      F-6
<PAGE>

                            PS BUSINESS PARKS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                               DECEMBER 31, 1999


1.   Organization and description of business

     Organization

     PS Business Parks, Inc. ("PSB" or the "Company"), a California corporation,
     is the successor to American Office Park  Properties,  Inc.  ("AOPP") which
     merged with and into Public Storage Properties XI, Inc. ("PSP 11") on March
     17,  1998  (the  "Merger").  The name of the  Company  was  changed  to "PS
     Business  Parks,  Inc." in  connection  with the  Merger.  See Note 3 for a
     description of the Merger and its terms.

     Based upon the terms of the Merger, the transaction for financial reporting
     and  accounting  purposes has been  accounted for as a reverse  acquisition
     whereby  AOPP is  deemed  to have  acquired  PSP11.  However,  PSP11 is the
     continuing  legal entity and  registrant  for both  Securities and Exchange
     Commission  filing  purposes  and  income  tax  reporting   purposes.   All
     subsequent  references to PSB or the Company for periods prior to March 17,
     1998 shall refer to AOPP.

     On January 2, 1997, in connection with the reorganization of the commercial
     property  operations  of  Public  Storage,   Inc.  ("PSI")  and  affiliated
     entities,  PSB formed a partnership (the "Operating  Partnership")  whereby
     PSB  became the  general  partner.  Concurrent  with the  formation  of the
     Operating  Partnership,  PSI and affiliated entities contributed commercial
     properties  to  the  Operating   Partnership   in  exchange  for  operating
     partnership  units ("OP units").  In addition,  PSI contributed  commercial
     properties  to PSB in  exchange  for  shares  of  non-voting  participating
     preferred stock,  and such properties were  immediately  contributed by PSB
     along with its commercial  property  management  operations and cash to the
     Operating Partnership for OP units.

     Subject to certain limitations as described in Note 8, holders of OP units,
     other than PSB,  have the right to require PSB to redeem  such  holders' OP
     units at any time or from  time to time  beginning  on the date that is one
     year  after the date on which  such  limited  partner  is  admitted  to the
     Operating Partnership.

     Description of business

     PSB is a  fully  integrated,  self-managed  real  estate  investment  trust
     ("REIT") that acquires,  owns, operates and develops commercial  properties
     containing  commercial and industrial rental space. From 1986 through 1996,
     PSB's sole  business  activity  consisted of the  management  of commercial
     properties owned primarily by PSI and affiliated entities.

     Commencing in 1997, PSB began to own and operate  commercial  properties on
     its own behalf.  At December 31, 1999,  PSB and the  Operating  Partnership
     collectively  owned and operated 125 commercial  properties  (approximately
     12.4 million net rentable  square feet) located in 11 states.  In addition,
     the Operating Partnership managed 37 commercial  properties  (approximately
     1.0  million  net  rentable  square  feet) on behalf of PSI and  affiliated
     entities.

2.   Summary of significant accounting policies

     Basis of presentation

     The consolidated  financial  statements include the accounts of PSB and the
     Operating   Partnership.   All   significant   intercompany   balances  and
     transactions have been eliminated in the consolidated financial statements.
     At December 31, 1999, PSB owned  approximately 72.5% of the common units of
     the  Operating  Partnership.  PSB,  as  the  sole  general  partner  of the
     Operating Partnership,  has full, exclusive and complete responsibility and
     discretion  in  managing  and   controlling   the  Operating   Partnership.
     Historical financial data of PSP11 have not been included in the historical
     financial statements of PSB.

                                      F-7
<PAGE>


                             PS BUSINESS PARKS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                DECEMBER 31, 1999


     On  March  31,  1997,  PSB  and  PSI  agreed  to  exchange  the  non-voting
     participating  preferred  stock held by PSI for 2,098,288  shares of voting
     common stock of PSB. After the exchange,  PSI owned in excess of 95% of the
     outstanding  common  voting  common stock of PSB and PSB  accounted for the
     transaction  as if PSI acquired  PSB in a  transaction  accounted  for as a
     purchase. Accordingly, PSB reflected PSI's cost of its investment in PSB in
     accordance with Accounting  Principles Board Opinion No. 16. As a result of
     PSI  attaining  control  of PSB,  the  carrying  value of PSB's  assets and
     liabilities  were  adjusted  to  reflect  PSI's  acquisition  cost  of  its
     controlling  interest in PSB of approximately $35 million. As a result, the
     carrying value of real estate facilities was increased  approximately  $8.0
     million, intangible assets increased approximately $4.4 million and paid in
     capital increased approximately $12.4 million.

     Prior to March 31,  1997,  control of PSB was held by  entities  other than
     PSI. As a result of PSI acquiring a majority of the voting common stock and
     control  of  PSB  on  March  31,  1997,  the  1997  consolidated  financial
     statements are presented  separately for the period prior to March 31, 1997
     (January 1, 1997 through March 31, 1997) and the period subsequent to March
     31, 1997 (April 1, 1997 through December 31, 1997) when control was held by
     PSI.

     Use of estimates

     The preparation of the consolidated financial statements in conformity with
     accounting  principles  generally  accepted in the United  States  requires
     management  to make  estimates  and  assumptions  that  affect the  amounts
     reported in the consolidated  financial  statements and accompanying notes.
     Actual results could differ from those estimates.

     Cash and cash equivalents

     PSB considers all highly liquid  investments  with an original  maturity of
     three  months or less at the date of purchase to be cash  equivalents.  The
     carrying amount of cash and cash equivalents approximates fair value.

     Real estate facilities

     Real  estate  facilities  are  recorded  at  cost.  Costs  related  to  the
     renovation or improvements of the properties are capitalized.  Expenditures
     for  repairs  and  maintenance  are  expensed as  incurred.  Buildings  and
     equipment are  depreciated on the  straight-line  method over the estimated
     useful lives, which are generally 30 and 5 years, respectively.

     Interest cost and property taxes incurred during the period of construction
     of real estate  facilities are  capitalized.  Construction  in progress and
     developed  projects  includes  $1,257,000  and  $268,000 of interest  costs
     capitalized  at  December  31,  1999 and 1998,  respectively.  The  Company
     capitalized  $989,000 and $268,000 during the years ended December 31, 1999
     and 1998, respectively.

     Intangible assets

     Intangible assets consist of property  management  contracts for properties
     managed,  but not owned, by PSB. The intangible  assets are being amortized
     over seven years. As properties  managed are subsequently  acquired by PSB,
     the  unamortized  basis of  intangible  assets  related to such property is
     included in the cost of acquisition of such properties.  During April 1997,
     PSB  acquired  four  properties  from PSI and  included in the cost of real
     estate  facilities  for such  properties  is  $730,000  of cost  previously
     classified  as  intangible  assets.  In  connection  with the  Merger,  PSB
     acquired  13  properties  and  included in the cost of such  properties  is
     $1,315,000   (net  of  accumulated   amortization  of  $194,000)  of  costs
     previously  classified as intangible  assets.  Intangible assets are net of
     accumulated  amortization of $874,000 and $573,000 at December 31, 1999 and
     1998, respectively.

                                      F-8
<PAGE>


                             PS BUSINESS PARKS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                DECEMBER 31, 1999


     Evaluation of asset impairment

     PSB evaluates its assets used in operations,  by identifying  indicators of
     impairment  and by comparing the sum of the estimated  undiscounted  future
     cash flows for each asset to the asset's carrying  amount.  When indicators
     of impairment are present and the sum of the undiscounted future cash flows
     is less  than the  carrying  value of such  asset,  an  impairment  loss is
     recorded equal to the difference between the asset's current carrying value
     and its value based on  discounting  its  estimated  future cash flows.  At
     December 31, 1999, no such indicators of impairment have been identified.

     Assets held for disposition are reported at the lower of carrying amount or
     fair value less selling costs.

     Note payable to and borrowings from affiliate

     The Company  borrowed  $3.5 million  from PSI during  1997.  The notes bore
     interest at 6.97% (per annum) and were repaid as of January 31, 1998.

     The Company  borrowed  $179 million  from PSI during  1998.  The notes bore
     interest at 6.91% (per annum) and were repaid as of May 27, 1998.

     The Company  borrowed  $41.4  million from PSI during 1999.  The notes bore
     interest at 5.50% (per annum) and were repaid as of April 30, 1999.

     Stock-based compensation

     PSB has  elected  to adopt the  disclosure  requirements  of  Statement  of
     Financial   Accounting   Standards   ("SFAS")  No.  123,   "Accounting  for
     Stock-Based  Compensation,"  but will  continue to account for  stock-based
     compensation under Accounting  Principles Board Opinion No. 25, "Accounting
     for Stock Issued to Employees."

     Stock split and stock dividend

     On January  1, 1997,  the number of  outstanding  shares of  preferred  and
     common  stock  increased  as a result of a 10 for 1 stock  split.  In March
     1997, the preferred stock of PSB was converted into common stock on a share
     for share basis.  In December 1997, PSB declared a common stock dividend at
     a rate of 0.01583 shares for each common share outstanding.  Similarly, the
     Operating  Partnership's  outstanding OP units were adjusted to reflect the
     stock dividend.  No adjustment was made to the outstanding OP units for the
     January 1997 stock  split,  as the issuance of OP units during 1997 already
     reflected the stock split.

     On March 17, 1998, in connection with the merger,  PSB's common shares were
     converted  into  1.18  shares  of  PSP11.  Similarly,  holders  of OP units
     received an additional  0.18 OP units for each  outstanding OP unit held at
     the time of the merger.

     References in the consolidated  financial statements and notes thereto with
     respect to shares of preferred stock,  common stock, stock options,  and OP
     units and the  related  per  share/unit  amounts  have  been  retroactively
     adjusted to reflect the January 1997 stock split,  the December  1997 stock
     dividend and the March 1998 conversion in connection with the Merger.

                                      F-9
<PAGE>

                             PS BUSINESS PARKS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                DECEMBER 31, 1999


     Revenue and expense recognition

     All leases are classified as operating leases.  Rental income is recognized
     on a straight-line basis over the terms of the leases.  Reimbursements from
     tenants for real estate taxes and other recoverable  operating expenses are
     recognized as revenue in the period the applicable costs are incurred.

     Costs incurred in connection with leasing  (primarily  tenant  improvements
     and leasing commissions) are
     capitalized and amortized over the lease period.

     Property management fees are recognized in the period earned.

     General and administrative expense

     General and administrative expense includes executive compensation,  office
     expense,  professional  fees,  state  income  taxes,  cost  of  acquisition
     personnel and other such administrative items. Such amounts include amounts
     incurred by PSI on behalf of PSB, which were subsequently charged to PSB in
     accordance with the allocation  methodology pursuant to the cost allocation
     and administrative service agreement between PSB and PSI.

     Acquisition costs

     Internal acquisition costs are expensed as incurred.

     Income taxes

     During  1997,  PSB  qualified  and intends to continue to qualify as a real
     estate investment trust ("REIT"), as defined in Section 856 of the Internal
     Revenue  Code. As a REIT,  PSB is not subject to federal  income tax to the
     extent that it  distributes  its  taxable  income to its  shareholders.  In
     addition,  REITs are subject to a number of  organizational  and  operating
     requirements.  If the  Company  fails to qualify  as a REIT in any  taxable
     year,  the Company  will be subject to federal  income tax  (including  any
     applicable  alternative  minimum  tax) based on its  taxable  income  using
     corporate income tax rates. Even if the Company qualifies for taxation as a
     REIT,  the Company  may be subject to certain  state and local taxes on its
     income  and  property  and  to  federal  income  and  excise  taxes  on its
     undistributed  taxable income.  PSB believes it met all  organizational and
     operating  requirements  to maintain its REIT status during 1999,  1998 and
     1997.  In  addition,  PSP11  (the legal  entity  for  income tax  reporting
     purposes  subsequent to the March 17, 1998 merger) believes it has also met
     these  requirements  during 1998 and 1997.  Accordingly,  no provision  for
     income taxes has been made in the accompanying financial statements.

     The  difference  between book income and taxable income  primarily  results
     from timing  differences  consisting of  depreciation  expense and unearned
     rental income.

     Net income per common share

     Per share  amounts are computed  using the weighted  average  common shares
     outstanding.  "Diluted" weighted average common shares outstanding  include
     the  dilutive  effect of stock  options  under the treasury  stock  method.
     "Basic" weighted average common shares  outstanding  excludes such dilutive
     effect. Earnings per share has been calculated as follows:

                                      F-10
<PAGE>


                            PS BUSINESS PARKS, INC.
                        NOTES TO CONSOLIDATED STATEMENTS
                               DECEMBER 31, 1999

<TABLE>
<CAPTION>


                                                                                     For the Period    For the Period
                                                    For the Year     For the Year        April 1          January 1
                                                       Ended            Ended            through           through
                                                    December 31,     December 31,     December 31,        March 31,
                                                    ------------     ------------    --------------    --------------
                                                        1999             1998             1997              1997
                                                    ------------     ------------    --------------    --------------
     <S>                                            <C>              <C>             <C>               <C>

     Net    income     allocable    to     common
       shareholders..............................   $37,849,000      $29,400,000     $  3,154,000      $   682,000
                                                    ============    ============    ==============    ==============


     Weighted average common  shares outstanding:

        Basic  weighted  average   common  shares
        outstanding..............................     23,641,000      19,361,000        3,414,000        2,193,000

        Net effect of  dilutive  stock  options -
          based on treasury  stock  method  using
          average market price...................         68,000          68,000           12,000                -
                                                    ------------     ------------    --------------    --------------
        Diluted  weighted  average  common shares
          outstanding............................     23,709,000      19,429,000        3,426,000        2,193,000
                                                    ============    ============    ==============    ==============


     Basic earnings per common share.............   $       1.60    $       1.52     $       0.92     $       0.31
                                                    ============    ============    ==============    ==============
     Diluted earnings per common share...........   $       1.60    $       1.51     $       0.92     $       0.31
                                                    ============    ============    ==============    ==============

</TABLE>

     Segment Reporting

     Effective  January 1, 1998,  PSB adopted SFAS No. 131,  "Disclosures  about
     Segments  of  an  Enterprise  and  Related   Information."   SFAS  No.  131
     established  standards  for  the way  public  business  enterprises  report
     information  about operating  segments in annual  financial  statements and
     requires that those enterprises report selected information about operating
     segments in interim financial reports.  SFAS 131 also establishes standards
     for related disclosures about products and services,  geographic areas, and
     major  customers.  As management views the Company as operating in a single
     segment as described in Note 1, the adoption of SFAS No. 131 did not affect
     PSB's disclosure of segment information.

     Reclassifications

     Certain  reclassifications  have  been made to the  consolidated  financial
     statements for 1998 in order to conform to the 1999 presentation.

3.   Business combination

     On March 17, 1998,  AOPP merged into PSP11,  a publicly  traded real estate
     investment  trust and an affiliate of PSI. Upon  consummation of the Merger
     of AOPP into PSP11,  the  surviving  corporation  was renamed "PS  Business
     Parks, Inc." (PSB as defined in Note 1). In connection with the Merger:

       o   Each  outstanding  share of PSP11 common  stock,  which did not elect
           cash,  continued to be owned by current  holders.  A total of 106,155
           PSP11 common shares elected to receive cash of $20.50 per share.

       o   Each  share of PSP11  common  stock  Series B and each share of PSP11
           common  stock Series C converted  into 0.8641  shares of PSP11 common
           stock.

                                      F-11
<PAGE>


                            PS BUSINESS PARKS, INC.
                        NOTES TO CONSOLIDATED STATEMENTS
                                DECEMBER 31, 1999


       o   Each share of AOPP common stock  converted  into 1.18 shares of PSP11
           common stock.

       o   Concurrent with the Merger,  PSP11 exchanged 11  mini-warehouses  and
           two properties that combine  mini-warehouse  and commercial space for
           11 commercial  properties  owned by PSI. The fair value of each group
           of real estate facilities was approximately $48 million.

     The  Merger  has been  accounted  for as a reverse  merger  whereby  PSB is
     treated as the accounting acquirer using the purchase method. This has been
     determined  based  upon the  following:  (i) the  former  shareholders  and
     unitholders of PSB owned in excess of 80% of the merged  companies and (ii)
     the  business  focus  post-Merger  will  continue to be that of PSB's which
     includes  the   acquisition,   ownership   and   management  of  commercial
     properties.  Prior to the Merger, PSP11's business focus has been primarily
     on the  ownership  and  operation  of  its  self-storage  facilities  which
     represented approximately 81% of its portfolio.

     Allocations of the total  acquisition  cost to the net assets acquired were
     made based upon the fair value of PSP11's assets and  liabilities as of the
     date of the Merger.  The acquisition cost and the fair market values of the
     assets  acquired and  liabilities  assumed in the Merger are  summarized as
     follows:

               Acquisition cost:
               -----------------
               Issuance of common stock..........         $46,810,000
               Cash..............................             424,000
                                                          ------------
                   Total acquisition cost........         $47,234,000
                                                          ============
               Allocation of acquisition cost:
               -------------------------------
               Real estate facilities............         $48,305,000
               Other assets......................             452,000
               Accrued and other liabilities.....          (1,523,000)
                                                          ------------
                   Total allocation..............         $47,234,000
                                                          ============

     The historical operating results of PSP11 prior to the Merger have not been
     included in PSB's historical operating results. Pro forma data for the year
     ended December 31, 1998 and 1997 as though the Merger and related  exchange
     of  properties  had been  effective at the  beginning of fiscal 1997 are as
     follows:

                                                For the Years Ended December 31,
                                                    1998               1997
                                                --------------    --------------
     Revenues...............................    $ 92,137,000       $  40,615,000
     Net income.............................    $ 30,159,000       $   7,042,000
     Net income per share - basic...........    $       1.52       $        1.30
     Net income per share - diluted.........    $       1.52       $        1.30


     The pro forma data does not purport to be indicative  either of the results
     of  operations  that would have  occurred  had the Merger  occurred  at the
     beginning of fiscal 1997 or of the future results of PSB.


                                      F-12
<PAGE>

                            PS BUSINESS PARKS, INC.
                        NOTES TO CONSOLIDATED STATEMENTS
                                DECEMBER 31, 1999

4.   Real estate facilities

     The  activity in real estate  facilities  for the years ended  December 31,
     1999 and 1998, the period from April 1, 1997 through  December 31, 1997 and
     the period from January 1, 1997 through March 31, 1997 is as follows:

<TABLE>
<CAPTION>
                                                                                Accumulated
                                               Land          Buildings          Depreciation          Total
                                           -------------    -------------     ----------------   ----------------
  <S>                                      <C>              <C>               <C>                <C>
  Balances at December 31, 1996.......     $          -     $           -     $             -    $             -
    Acquisitions from affiliates......       35,154,000        82,026,000                   -        117,180,000
    Adjustment   to   reflect    PSI's
         acquisition cost (Note 2)....                -         7,146,000             820,000          7,966,000
    Capital improvements..............                -           582,000                   -            582,000
    Depreciation expense..............                -                 -            (820,000)          (820,000)
                                           -------------    -------------     ----------------   ----------------
  Balances at March 31, 1997..........       35,154,000        89,754,000                   -        124,908,000
    Acquisition from affiliates.......        6,682,000        17,294,000                   -         23,976,000
    Acquisitions from third parties...       49,918,000       116,435,000                   -        166,353,000
    Capital improvements..............                -         2,983,000                   -          2,983,000
    Depreciation expense..............                -                 -          (3,982,000)        (3,982,000)
                                           -------------    -------------     ----------------   ----------------
  Balances at December 31, 1997.......       91,754,000       226,466,000          (3,982,000)       314,238,000
    Property acquisitions.............       70,087,000       263,920,000                   -        334,007,000
    Acquired  in connection  with  the
         Merger.......................       14,400,000        33,905,000                   -         48,305,000
    Adjustment from intangible assets.                -         1,315,000                   -          1,315,000
    Capital improvements..............                -        11,091,000                   -         11,091,000
    Depreciation expense..............                -                 -         (18,535,000)       (18,535,000)
                                           -------------    -------------     ----------------   ----------------
  Balances at December 31, 1998.......      176,241,000       536,697,000         (22,517,000)       690,421,000
    Property acquisitions.............       18,705,000        84,134,000                   -        102,839,000
    Developed projects................        3,725,000         9,925,000                   -         13,650,000
    Property held for disposition.....       (4,531,000)      (10,706,000)          1,002,000        (14,235,000)
    Capital improvements..............                -        16,211,000                   -         16,211,000
    Depreciation expense..............                -                 -         (29,461,000)       (29,461,000)
                                           -------------    -------------     ----------------   ----------------
  Balances at December 31, 1999.......     $194,140,000     $636,261,000      $   (50,976,000)   $   779,425,000
                                           =============    =============     ================   ================

</TABLE>

     The unaudited  adjusted basis of real estate  facilities for Federal income
     tax purposes was approximately $712 million at December 31, 1999.

     Certain  properties  have been  identified  as not  meeting  the  Company's
     ongoing investment strategy and have been designated as properties held for
     disposition  at December 31, 1999.  These  properties  are currently  being
     marketed and the Company  anticipates  a gain on the sale in the next year.
     The  following  summarizes  the  condensed  results  of  operations  of the
     properties  held for  disposition  which are  included in the  consolidated
     statements  of income for the years ended  December 31, 1999 and 1998,  the
     period  from April 1, 1997  through  December  31, 1997 and the period from
     January 1, 1997 through March 31, 1997.  Historical  operating  results may
     not be comparable  since one of the  properties  held for  disposition  was
     acquired during the periods presented.

                                      F-13
<PAGE>




                            PS BUSINESS PARKS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                               DECEMBER 31, 1999

<TABLE>
<CAPTION>


                                                                                     For the Period    For the Period
                                                    For the Year     For the Year        April 1          January 1
                                                       Ended            Ended            through           through
                                                    December 31,     December 31,     December 31,        March 31,
                                                    ------------     ------------    --------------    --------------
                                                        1999             1998             1997              1997
                                                    ------------     ------------    --------------    --------------
     <S>                                            <C>              <C>             <C>               <C>

     Rental income...............................   $ 4,283,000      $ 4,056,000     $  1,761,000      $    85,000
     Cost of operations..........................     1,605,000        1,661,000          756,000           45,000
                                                    ------------     ------------    --------------    --------------
     Net operating income........................   $ 2,678,000      $ 2,395,000     $  1,005,000      $    40,000
                                                    ============     ============    ==============    ==============


</TABLE>

5.   Leasing activity

     The Company  leases space in its real estate  facilities  to tenants  under
     non-cancelable  leases  generally  ranging  from one to ten  years.  Future
     minimum rental revenues  excluding  recovery of expenses as of December 31,
     1999 under these leases are as follows:

               2000..............................      $   98,798,000
               2001..............................          73,313,000
               2002..............................          50,962,000
               2003..............................          34,177,000
               2004..............................          21,692,000
               Thereafter........................          38,941,000
                                                       --------------
                                                       $  317,883,000
                                                       ==============

     In addition to minimum  rental  payments,  tenants pay  reimbursements  for
     their pro rata share of specified  operating  expenses,  which  amounted to
     $16,591,000,  $10,357,000,  $2,597,000  and  $509,000  for the years  ended
     December 31, 1999 and 1998, the period from April 1, 1997 through  December
     31,  1997 and the period  from  January  1, 1997  through  March 31,  1997,
     respectively.  These  amounts  are  included  as rental  income and cost of
     operations in the accompanying statements of income.

6.   Revolving line of credit

     In August  1999,  the Company  extended its  unsecured  line of credit (the
     "Credit  Facility")  with  Wells  Fargo  Bank.  The Credit  Facility  has a
     borrowing  limit of $100 million and an expiration  date of August 6, 2002.
     The expiration date may be extended by one year on each  anniversary of the
     Credit Facility.  Interest on outstanding borrowings is payable monthly. At
     the option of the Company, the rate of interest charged is equal to (i) the
     prime rate or (ii) a rate  ranging from the London  Interbank  Offered Rate
     ("LIBOR") plus 0.75% to 1.35% depending on the Company's credit ratings and
     coverage ratios, as defined (currently LIBOR plus 1.00%). In addition,  the
     Company is required to pay an annual  commitment fee of 0.25%.  At December
     31, 1999, the Company had $100 million available and no outstanding balance
     on the line of credit.  At December 31, 1998, the Company had $12.5 million
     outstanding on the line of credit at an interest rate of 5.93%.

     The  Credit  Facility  requires  the  Company  to  meet  certain  covenants
     including: (i) maintain a balance sheet leverage ratio (as defined) of less
     than 0.50 to 1.00, (ii) maintain  interest and fixed charge coverage ratios
     (as  defined)  of not less than 2.25 to 1.0 and 1.75 to 1.0,  respectively,
     (iii) maintain a minimum total  shareholder's  equity (as defined) and (iv)
     limit  distributions  to 95% of funds from  operations.  In  addition,  the
     Company is  limited in its  ability  to incur  additional  borrowings  (the
     Company is required to maintain  unencumbered assets with an aggregate book
     value equal to or greater than two times the Company's  unsecured  recourse
     debt) or sell assets.  The Company was in compliance  with the covenants of
     the Credit Facility at December 31, 1999.

                                      F-14
<PAGE>

                             PS BUSINESS PARKS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                DECEMBER 31, 1999


7.   Mortgage notes payable

     Mortgage notes at December 31, 1999 and 1998 consist of the following:

<TABLE>
<CAPTION>

                                                                                      1999                1998
                                                                                   -----------        ------------
     <S>                                                                           <C>               <C>

     7.625%  mortgage  note...............................................         $         -       $ 11,418,000
     7.125%  mortgage  note,  secured by one  commercial  property with an
          approximate  carrying  amount  of  $19,642,000,   principal  and
          interest payable monthly, due May 2006..........................           8,751,000          8,905,000
     8.400%  mortgage  note...............................................                   -          8,672,000
     8.190%  mortgage  note,  secured by one  commercial  property with an
          approximate  carrying  amount  of  $12,897,000,   principal  and
          interest payable monthly, due March 2007........................           6,666,000                  -
     7.290%  mortgage  note,  secured by one  commercial  property with an
          approximate carrying amounts totaling $8,474,000,  principal and
          interest payable monthly, due February 2009.....................           6,372,000                  -
     8.125%  mortgage  note,  secured by one  commercial  property with an
          approximate  carrying  amount  of  $12,251,000,   principal  and
          interest payable monthly, due July 2005.........................           5,327,000          5,416,000
     7.280%  mortgage  note,  secured by two  commercial  properties  with
          approximate carrying amounts totaling $7,998,000,  principal and
          interest payable monthly, due February 2003.....................           4,304,000                  -
     8.000%  mortgage  note,  secured by one  commercial  property with an
          approximate   carrying  amount  of  $5,658,000,   principal  and
          interest payable monthly, due April 2003........................           2,108,000                  -
     8.500%  mortgage  note,  secured by one  commercial  property with an
          approximate   carrying  amount  of  $3,601,000,   principal  and
          interest payable monthly, due July 2007.........................           1,898,000          1,939,000
     8.000%  mortgage  note,  secured by one  commercial  property with an
          approximate   carrying  amount  of  $3,426,000,   principal  and
          interest payable monthly, due April 2003........................           1,640,000          1,691,000
                                                                                   -----------        ------------
                                                                                   $37,066,000        $38,041,000
                                                                                   ===========        ============

</TABLE>

At December 31, 1999, approximate principal maturities of mortgage notes payable
are as follows:


               2000..............................      $      6,095,000
               2001..............................               829,000
               2002..............................               895,000
               2003..............................             7,870,000
               2004..............................               696,000
               Thereafter........................            20,681,000
                                                       ----------------
                                                       $     37,066,000
                                                       ================

                                      F-15
<PAGE>


                             PS BUSINESS PARKS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                DECEMBER 31, 1999


     The mortgage  notes have a weighted  average  interest rate of 7.67% and an
     average maturity of 5.6 years. Based on borrowing rates currently available
     to the Company, the carrying amount of debt approximates fair value.

     On November  12,  1999,  the  Company  prepaid a mortgage  note  payable of
     approximately  $8.5  million.  The  prepayment  penalty of $195,000 (net of
     minority interest of $61,000) is included as an extraordinary loss on early
     extinguishment of debt for the year ended December 31, 1999.

8.   Minority interests - common units

     The Company presents the accounts of PSB and the Operating Partnership on a
     consolidated basis. Ownership interests in the Operating Partnership, other
     than  PSB's   interest,   are  classified  as  minority   interest  in  the
     consolidated financial statements.  Minority interest in income consists of
     the minority interests' share of the consolidated operating results.

     Beginning  one year from the date of  admission  as a limited  partner  and
     subject to certain limitations  described below, each limited partner other
     than  PSB has the  right  to  require  the  redemption  of its  partnership
     interest.

     A limited  partner that  exercises its  redemption  right will receive cash
     from the Operating  Partnership  in an amount equal to the market value (as
     defined  in  the  Operating  Partnership   Agreement)  of  the  partnership
     interests  redeemed.  In lieu of the  Operating  Partnership  redeeming the
     partner  for  cash,  PSB,  as  general  partner,  has the right to elect to
     acquire the partnership interest directly from a limited partner exercising
     its redemption right, in exchange for cash in the amount specified above or
     by  issuance  of one share of PSB  common  stock  for each unit of  limited
     partnership interest redeemed.

     A limited  partner  cannot  exercise  its  redemption  right if delivery of
     shares  of PSB  common  stock  would be  prohibited  under  the  applicable
     articles of incorporation,  if the general partner believes that there is a
     risk  that  delivery  of shares of common  stock  would  cause the  general
     partner to no longer  qualify as a REIT,  would  cause a  violation  of the
     applicable securities laws, or would result in the Operating Partnership no
     longer being treated as a partnership for federal income tax purposes.

     At  December  31,  1999,  there were  7,443,356  OP units owned by minority
     interests  (7,305,355 were owned by PSI and affiliated entities and 138,001
     were owned by  unaffiliated  third parties).  On a fully  converted  basis,
     assuming  all  7,443,356  minority  interest OP units were  converted  into
     shares of common stock of PSB at December 31, 1999, the minority  interests
     would own approximately 23.9% of the common shares outstanding.  At the end
     of each reporting  period,  PSB determines the amount of equity (book value
     of net assets) which is allocable to the minority  interest  based upon the
     ownership interest and an adjustment is made to the minority interest, with
     a  corresponding  adjustment  to paid-in  capital,  to reflect the minority
     interests' equity in the Company.

9.   Minority interest - preferred units

     On April 23, 1999, the Operating  Partnership completed a private placement
     of 510,000  preferred units with a preferred  distribution  rate of 8 7/8%.
     The net proceeds from the placement of preferred  units were  approximately
     $12.5 million and were used to repay borrowings from an affiliate.

     On  September  3,  1999,  the  Operating  Partnership  completed  a private
     placement of 3,200,000  preferred units with a preferred  distribution rate
     of 8 3/4%.  The net proceeds  from the  placement  of preferred  units were
     approximately  $78  million and part of the  proceeds  was used to prepay a
     mortgage note payable of approximately $8.5 million.

                                      F-16
<PAGE>


                             PS BUSINESS PARKS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                DECEMBER 31, 1999


     On September 7 and 23, 1999, the Operating  Partnership  completed  private
     placements of 1,200,000 and 400,000 preferred units,  respectively,  with a
     preferred  distribution rate of 8 7/8%. The net proceeds from the placement
     of preferred units were approximately $39.2 million.

     The Operating Partnership has the right to redeem the preferred units on or
     after the fifth  anniversary  of the issuance date at the original  capital
     contribution  plus the  cumulative  priority  return,  as  defined,  to the
     redemption  date to the extent not  previously  distributed.  The preferred
     units are  exchangeable  for Cumulative  Redeemable  Preferred Stock of the
     respective  series  of PS  Business  Parks,  Inc.  on or  after  the  tenth
     anniversary  of the  date  of  issuance  at  the  option  of the  Operating
     Partnership  or  majority  of the  holders  of  the  preferred  units.  The
     Preferred Stock will have the same  distribution  rate and par value as the
     respective  units and will have equivalent terms to those described in Note
     11.

10.  Property management contracts

     The Operating Partnership manages industrial,  office and retail facilities
     for PSI and entities affiliated with PSI. These facilities,  all located in
     the United  States,  operate  under the "Public  Storage"  or "PS  Business
     Parks" name.

     The property management  contracts provide for compensation of five percent
     of the gross revenue of the facilities  managed.  Under the  supervision of
     the property owners, the Operating Partnership coordinates rental policies,
     rent  collections,  marketing  activities,  the purchase of  equipment  and
     supplies,  maintenance  activities,  and the  selection  and  engagement of
     vendors, suppliers and independent contractors.  In addition, the Operating
     Partnership  assists  and  advises  the  property  owners  in  establishing
     policies for the hire,  discharge  and  supervision  of  employees  for the
     operation  of  these  facilities,  including  property  managers,  leasing,
     billing and maintenance personnel.

     The property management contract with PSI is for a seven year term with the
     term being  extended one year each  anniversary.  The  property  management
     contracts with  affiliates of PSI are cancelable by either party upon sixty
     days notice.

11.  Shareholders' equity

     In addition  to common and  preferred  stock,  PSB is  authorized  to issue
     100,000,000  shares of Equity Stock. The Articles of Incorporation  provide
     that the Equity Stock may be issued from time to time in one or more series
     and gives the Board of  Directors  broad  authority to fix the dividend and
     distribution rights,  conversion and voting rights,  redemption  provisions
     and liquidation rights of each series of Equity Stock.

     On January 7, 1998, a holder of OP units exercised its option and converted
     its  1,785,007 OP units into an equal number of shares of PSB common stock.
     The  conversion  resulted  in an  increase  in  shareholders'  equity and a
     corresponding  decrease in minority  interest of approximately  $33,023,000
     representing the book value of the OP units at the time of conversion.

     In  January  1998,   PSB  entered  into  an  agreement   with  a  group  of
     institutional  investors  under  which PSB agreed to issue up to  6,774,072
     shares of common  stock at $22.88 per share in cash (an  aggregate  of $155
     million) in separate tranches.  The first tranche,  representing  2,185,187
     shares or $50  million,  was  issued in January  1998.  PSB  incurred  $2.4
     million in costs associated with the issuance.  The remainder of the common
     shares  (4,588,885  common  shares)  was  issued on May 6, 1998 and the net
     proceeds  ($105 million) were used to fund a portion of the cost to acquire
     commercial properties in May 1998.


                                      F-17
<PAGE>

                             PS BUSINESS PARKS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                DECEMBER 31, 1999


     In May 1998, PSB completed two common stock offerings, raising net proceeds
     in  aggregate  totaling  $118.9  million  through the issuance of 5,025,800
     common shares.  A portion of the net proceeds was used in connection with a
     $190 million property portfolio acquisition.

     On April 30, 1999, PSB issued 2,200,000 depositary shares each representing
     1/1,000  of a share of 9 1/4%  Cumulative  Preferred  Stock,  Series A. Net
     proceeds  from  the  public   perpetual   preferred   stock  offering  were
     approximately  $53.1  million  and were  used to repay  borrowings  from an
     affiliate and a mortgage  note payable of  approximately  $11 million.  The
     remaining proceeds were used for investment in real estate.

     Holders of the  Company's  preferred  stock will not be entitled to vote on
     most matters, except under certain conditions. In the event of a cumulative
     arrearage  equal to six quarterly  dividends,  the holders of the preferred
     stock will have the right to elect two  additional  members to serve on the
     Company's  Board of Directors  until all events of default have been cured.
     At December 31, 1999, there were no dividends in arrears.

     Except under certain conditions relating to the Company's  qualification as
     a REIT, the preferred  stock is not redeemable  prior to April 30, 2004. On
     or after April 30, 2004,  the preferred  stock will be  redeemable,  at the
     option of the Company,  in whole or in part, at $25 per  depositary  share,
     plus any accrued and unpaid dividends.

     The  Company  paid  distributions  to  its  common  shareholders   totaling
     $23,641,000 ($1.00 per common share),  $21,806,000 ($1.10 per common share)
     and  $3,550,000   ($0.68  per  common  share)  in  1999,   1998  and  1997,
     respectively.  The Company paid distributions to its preferred shareholders
     totalling  $3,406,000 (1.548090 per depositary share) in 1999. No preferred
     distributions  were paid in 1998 and 1997.  Pursuant to restrictions on the
     Credit Facility, distributions may not exceed 95% of funds from operations,
     as defined.

12.  Stock options

     PSB has a 1997 Stock  Option  Plan (the  "Plan").  Under the Plan,  PSB has
     granted  non-qualified  options  to  certain  directors,  officers  and key
     employees to purchase  shares of PSB's common stock at a price no less than
     the fair market value of the common stock at the date of grant.  Generally,
     options under the Plan vest over a three-year period from the date of grant
     at the rate of one third per year and  expire  ten years  after the date of
     grant.

     At December 31, 1999,  there were  1,500,000  options  authorized to grant.
     Information with respect to the Plan is as follows:

<TABLE>
<CAPTION>

                                                                                            Weighted
                                                       Number of          Exercise           Average
                                                        Options            Price          Exercise Price
                                                   ----------------   ----------------   -----------------
     <S>                                           <C>                <C>                <C>
     Outstanding at December 31, 1996...........                 -            -                        -
          Granted...............................           305,570     $16.69 - 22.88             $16.80
          Exercised.............................                 -            -                        -
          Canceled..............................                 -            -                        -
                                                   ----------------   ----------------   -----------------
     Outstanding at December 31, 1997...........           305,570    $16.69 - $22.88             $16.80
          Granted...............................           222,500      22.88 - 25.00              24.01
          Exercised.............................           (39,024)         16.69                  16.69
          Canceled..............................                 -            -                        -
                                                   ----------------   ----------------   -----------------
     Outstanding at December 31, 1998...........           489,046      16.69 - 25.00             $20.09
          Granted...............................            11,000      24.69 - 24.75              24.70
          Exercised.............................            (7,191)         16.69                  16.69
          Canceled..............................           (10,497)     16.69 - 25.00              18.67
                                                   ----------------   ----------------   -----------------
     Outstanding at December 31, 1999...........           482,358     $16.69 - $25.00            $20.28
                                                   ================   ================   =================

</TABLE>

                                      F-18
<PAGE>

                            PS BUSINESS PARKS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                DECEMBER 31, 1999

<TABLE>
<CAPTION>
                                                                                            Weighted
                                                       Number of          Exercise           Average
                                                        Options            Price          Exercise Price
                                                   ----------------   ----------------   -----------------
     <S>                                           <C>                <C>                <C>
     Exercisable at:
          December 31, 1998.....................            62,828     $16.69 - $22.88            $16.87
          December 31, 1999.....................           226,417     $16.69 - $25.00            $19.16
</TABLE>

     PSB  adopted  the  disclosure  requirement  provision  of SFAS  No.  123 in
     accounting for stock-based compensation issued to employees. As of December
     31, 1999 and 1998,  there were  482,358 and  489,046  options  outstanding,
     respectively,  that were subject to SFAS No. 123  disclosure  requirements.
     The  fair  value  of  these  options  was  estimated  utilizing  prescribed
     valuation models and assumptions as of each respective grant date. Based on
     the  results of such  estimates,  management  determined  that there was no
     material  effect on net income or  earnings  per share for the years  ended
     December 31, 1999 and 1998, the period from April 1, 1997 through  December
     31, 1997 and the period from  January 1, 1997 through  March 31, 1997.  The
     remaining  contractual  lives  were  7.9 and  8.9  years,  respectively  at
     December 31, 1999 and 1998.

13.  Recent accounting pronouncements

     In June 1998, the Financial Accounting Standards Board issued SFAS No. 133,
     "Accounting for Derivative  Instruments and Hedging  Activities,"  which is
     required  to be  adopted  in years  beginning  after  June 15,  2000.  This
     statement  provides  a  comprehensive  and  consistent   standard  for  the
     recognition  and  measurement of  derivatives  and hedging  activites.  The
     Company  is  studying  this  statement  to  determine  the  effect  of  the
     consolidated financial statements and will adopt this statement in the year
     ended December 31, 2001.


14.  Supplementary quarterly financial data (unaudited)

<TABLE>
<CAPTION>
                                                                      Three Months Ended
                                           -------------------------------------------------------------------------
                                              March 31,          June 30,         September 30,        December 31,
                                                1998               1998               1998                1998
                                           ----------------    --------------   -----------------   ----------------
    <S>                                    <C>                 <C>              <C>                 <C>
    Revenues...........................     $  14,788,000      $  21,911,000      $  26,277,000       $  27,284,000
    Net income allocable to common
    shareholders.......................     $   4,330,000      $   7,046,000      $   9,748,000       $   8,276,000

    Per share data:
    ---------------
    Net income - Basic.................             $0.38              $0.38              $0.41               $0.35
    Net income - Diluted...............             $0.38              $0.38              $0.41               $0.35
</TABLE>
<TABLE>
<CAPTION>
                                                                      Three Months Ended
                                           -------------------------------------------------------------------------
                                              March 31,          June 30,         September 30,        December 31,
                                                1999               1999               1999                1999
                                           ----------------    --------------   -----------------   ----------------
    <S>                                    <C>                 <C>              <C>                 <C>
    Revenues...........................     $  29,251,000      $  31,248,000      $  33,281,000       $  34,833,000
    Income before extraordinary item...     $   9,442,000      $   9,393,000      $   9,383,000       $  11,098,000
    Net income allocable to common
    shareholders.......................     $   9,442,000      $   9,393,000      $   9,383,000       $   9,631,000

    Per share data:
    ---------------
    Income before extraordinary item -
    Basic..............................             $0.40              $0.40              $0.40               $0.42
    Income before extraordinary item -
    Diluted............................             $0.40              $0.40              $0.40               $0.42
</TABLE>

                                      F-19
<PAGE>

                             PS BUSINESS PARKS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                DECEMBER 31, 1999


15.  Commitments and contingencies

     PSB is subject to the risks  inherent in the  ownership  and  operation  of
     commercial  real estate.  These include,  among others,  the risks normally
     associated with changes in the general economic climate, trends in the real
     estate industry,  creditworthiness of tenants, competition,  changes in tax
     laws,  interest rate levels,  the  availability  of financing and potential
     liability under environmental and other laws.

     Substantially  all of  the  properties  have  been  subjected  to  Phase  I
     environmental  reviews.  Such reviews have not revealed,  nor is management
     aware of, any  probable or  reasonably  possible  environmental  costs that
     management  believes  would  be  material  to  the  consolidated  financial
     statements except as discussed below.

     The Company acquired a property in Beaverton,  Oregon ("Creekside Corporate
     Park") in May 1998.  A property  adjacent to  Creekside  Corporate  Park is
     currently     the     subject     of     an     environmental      remedial
     investigation/feasibility  study that is being conducted by the current and
     past  owners of the  property,  pursuant  to an order  issued by the Oregon
     Department of Environmental  Quality ("ODEQ").  As part of that study, ODEQ
     ordered the property owners to sample soil and groundwater on the Company's
     property to determine the nature and extent of contamination resulting from
     past  industrial  operations  at the  property  subject to the  study.  The
     Company,  which is not a party of the Order on Consent,  executed  separate
     Access  Agreements with the property owners to allow access to its property
     to conduct the required  sampling and testing.  The sampling and testing is
     ongoing,   and  preliminary   results  from  one  area  indicate  that  the
     contamination from the property subject to the study may have migrated onto
     a portion of Creekside Corporate Park owned by the Company.

     There  is no  evidence  that  any  past  or  current  use of the  Creekside
     Corporate Park property contributed in any way to the contamination that is
     the subject of the current investigation.  Nevertheless, upon completion of
     the study, it is likely that removal or remedial  measures will be required
     to address any  contamination  detected  during the current  investigation,
     including  any  contamination  on or under  the  Creekside  Corporate  Park
     property.  Because  of the  preliminary  nature of the  investigation,  the
     Company  cannot  predict  the  outcome  of the  investigation,  nor  can it
     estimate the costs of any  remediation  or removal  activities  that may be
     required.

     The Company believes that it bears no  responsibility  or liability for the
     contamination.  In the event the Company is ultimately  deemed  responsible
     for any costs relating to this matter,  the Company believes that the party
     from whom the property was purchased will be  responsible  for any expenses
     or   liabilities   that  the   Company  may  incur  as  a  result  of  this
     contamination.

     On  November  3,  1999,  the  Company  filed an action  in the Los  Angeles
     Superior  Court  seeking  damages  in  excess  of $1  million,  as  well as
     equitable  relief.  The  complaint  alleges  that Mr.  Howard and  entities
     controlled  by  him  engaged  in  unfair  trade  practices,  including  (1)
     negotiating kickbacks,  secret rebates and/or unearned discounts from third
     party suppliers for "providing" Company business to those suppliers and (2)
     disrupting the Company's relationship with various suppliers (See Note 16).

     PSB currently is neither  subject to any other material  litigation nor, to
     management's  knowledge,  is any material litigation  currently  threatened
     against PSB other than routine  litigation and  administrative  proceedings
     arising in the ordinary  course of  business.  Based on  consultation  with
     counsel,  management  believes  that  these  items will not have a material
     adverse impact on the Company's  consolidated financial position or results
     of operations.


                                      F-20

<PAGE>

                             PS BUSINESS PARKS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                DECEMBER 31, 1999


16.  Subsequent events

     The Company  loaned an aggregate of $77 million to PSI during the period of
     January 5, 2000 through March 8, 2000.  The notes bore interest at 5.9% per
     year and were repaid as of March 20, 2000.

     On or about  February 14, 2000,  Mr. Howard and entities  controlled by him
     filed a  cross-complaint  against the Company,  Public  Storage,  Inc., and
     several  other   cross-defendants   alleging,   among  other  things,   (1)
     interference  with Mr.  Howard's  contractual  relations with various third
     party suppliers, (2) violation of Title VII of the Civil Rights Act and (3)
     abuse of process. None of the cross-complainants assigned any dollar amount
     in the  cross-complaint  to the claims.  The Company  intends to vigorously
     contest the claims in the cross-complaint.

     On March 2, 2000, the Board of Directors  authorized  the  repurchase  from
     time to time of up to 1,000,000 shares of the Company's common stock on the
     open market or in privately negotiated transactions. Purchases will be made
     subject to market conditions and other investment  opportunities  available
     to the  Company.  As of March 13,  2000,  the Company  repurchased  212,400
     shares at an average price of $21.43 per share.


                                      F-21
<PAGE>
                              PS BUSINESS PARKS, INC.
             SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
                                DECEMBER 31, 1999
                             (DOLLARS IN THOUSANDS)
<TABLE>
<CAPTION>
                                                                                         Cost
                                                                                      Capitalized
                                                                                      Subsequent to   Gross Amount at Which Carried
                                                           Initial Cost to Company    Acquisition        at December 31, 1999
                                                          -------------------------------------------------------------------------
                                                                   Buildings and   Buildings and           Buildings and
         Description            Location   Encumbrances     Land   Improvements    Improvements    Land    Improvements      Totals
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                     <C>                       <C>      <C>          <C>               <C>       <C>         <C>         <C>
I-435.................  Overland Park, KS         $-       $ 890        $2,176            $98       $890        $2,274      $3,164
Produce...............  San Francisco, CA          -         771         1,886             26        771         1,912       2,683
Crenshaw II...........  Torrance, CA               -       1,861         4,938            440      1,861         5,378       7,239
Airport...............  San Francisco, CA          -         897         2,387             90        897         2,477       3,374
Christopher Ave.......  Gaithersburg, MD           -         466         1,203             95        466         1,298       1,764
Monterey Park.........  Monterey Park, CA          -       3,078         7,862            330      3,078         8,192      11,270
Calle Del Oaks........  Monterey, CA               -         282           706            110        282           816       1,098
Milwaukie I...........  Milwaukie, OR              -         690         1,754            345        690         2,099       2,789
Edwards Road..........  Cerritos, CA               -         450         1,217            202        450         1,419       1,869
Milwaukie II..........  Milwaukie, OR              -         435         1,103            167        435         1,270       1,705
Rainier...............  Renton, WA                 -         330           889            153        330         1,042       1,372
Lusk..................  San Diego, CA              -       1,500         3,738            355      1,500         4,093       5,593
Eisenhower............  Alexandria, VA             -       1,440         3,635            329      1,440         3,964       5,404
McKellips.............  Tempe, AZ                  -         195           522             39        195           561         756
Crenshaw..............  Torrance, CA               -         450         1,131             87        450         1,218       1,668
Old Oakland Rd........  San Jose, CA               -       3,458         8,765            428      3,458         9,193      12,651
Junipero..............  Signal Hill, CA            -         900         2,510             53        900         2,563       3,463
Watson Plaza..........  Lakewood, CA               -         930         2,360            106        930         2,466       3,396
Northgate Blvd........  Sacramento, CA             -       1,710         4,567            341      1,710         4,908       6,618
Camino Del Rio S......  San Diego, CA              -         930         2,388            364        930         2,752       3,682
Uplander..............  Culver City, CA            -       3,252         8,157          1,375      3,252         9,532      12,784
University............  Tempe, AZ                  -       2,160         5,454            562      2,160         6,016       8,176
E. 28th Street........  Signal Hill, CA            -       1,500         3,749            290      1,500         4,039       5,539
W. Main...............  Mesa, AZ                   -         675         1,692            230        675         1,922       2,597
S. Edward.............  Tempe, AZ                  -         645         1,653            345        645         1,998       2,643
Leapwood Ave..........  Carson, CA                 -         990         2,496            556        990         3,052       4,042
Downtown Center.......  Nashville, TN              -         660         1,681            478        660         2,159       2,819
Airport South.........  Nashville, TN              -         660         1,657            171        660         1,828       2,488
Great Oaks............  Woodbridge, VA             -       1,350         3,398            180      1,350         3,578       4,928
W. Concord Cir........  Broken Arrow, OK           -         840         2,174            114        840         2,288       3,128
John Barrow...........  Little Rock, AR            -         780         1,998             95        780         2,093       2,873
S. Peoria.............  Tulsa, OK                  -         375           962             35        375           997       1,372
Ventura Blvd. II......  Studio City, CA            -         621         1,530            168        621         1,698       2,319
Largo 95..............  Largo, MD                  -       3,085         7,332            398      3,085         7,730      10,815
Gunston...............  Lorton, VA                 -       4,146        17,872            256      4,146        18,128      22,274
</TABLE>

                                                                    Depreciable
                                           Accumulated      Date       Lives
         Description       Location        Depreciation   Acquired    (Years)
- -------------------------------------------------------------------------------
I-435.................  Overland Park, KS     $139        3/17/98       5-30
Produce...............  San Francisco, CA      116        3/17/98       5-30
Crenshaw II...........  Torrance, CA           567        4/12/97       5-30
Airport...............  San Francisco, CA      239        4/12/97       5-30
Christopher Ave.......  Gaithersburg, MD       132        4/12/97       5-30
Monterey Park.........  Monterey Park, CA      803        1/1/97        5-30
Calle Del Oaks........  Monterey, CA            86        1/1/97        5-30
Milwaukie I...........  Milwaukie, OR          242        1/1/97        5-30
Edwards Road..........  Cerritos, CA           142        1/1/97        5-30
Milwaukie II..........  Milwaukie, OR           87        1/1/97        5-30
Rainier...............  Renton, WA             102        1/1/97        5-30
Lusk..................  San Diego, CA          403        1/1/97        5-30
Eisenhower............  Alexandria, VA         388        1/1/97        5-30
McKellips.............  Tempe, AZ               55        1/1/97        5-30
Crenshaw..............  Torrance, CA            84        1/1/97        5-30
Old Oakland Rd........  San Jose, CA           902        1/1/97        5-30
Junipero..............  Signal Hill, CA        225        1/1/97        5-30
Watson Plaza..........  Lakewood, CA           239        1/1/97        5-30
Northgate Blvd........  Sacramento, CA         459        1/1/97        5-30
Camino Del Rio S......  San Diego, CA          271        1/1/97        5-30
Uplander..............  Culver City, CA        965        1/1/97        5-30
University............  Tempe, AZ              597        1/1/97        5-30
E. 28th Street........  Signal Hill, CA        392        1/1/97        5-30
W. Main...............  Mesa, AZ               186        1/1/97        5-30
S. Edward.............  Tempe, AZ              198        1/1/97        5-30
Leapwood Ave..........  Carson, CA             313        1/1/97        5-30
Downtown Center.......  Nashville, TN          209        1/1/97        5-30
Airport South.........  Nashville, TN          178        1/1/97        5-30
Great Oaks............  Woodbridge, VA         346        1/1/97        5-30
W. Concord Cir........  Broken Arrow, OK       217        1/1/97        5-30
John Barrow...........  Little Rock, AR        202        1/1/97        5-30
S. Peoria.............  Tulsa, OK               96        1/1/97        5-30
Ventura Blvd. II......  Studio City, CA        172        1/1/97        5-30
Largo 95..............  Largo, MD              638        9/24/97       5-30
Gunston...............  Lorton, VA           1,510        6/17/98       5-30

                                      F-22
<PAGE>
                            PS BUSINESS PARKS, INC.
             SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
                                DECEMBER 31, 1999
                             (DOLLARS IN THOUSANDS)
<TABLE>
<CAPTION>
                                                                                           Cost
                                                                                        Capitalized
                                                                                        Subsequent to     Gross Amount at Which
                                                              Initial Cost to Company    Acquisition   Carried at December 31, 1999
                                                             ----------------------------------------------------------------------
                                                                     Buildings and   Buildings and          Buildings and
         Description            Location      Encumbrances    Land   Improvements    Improvements    Land   Improvements    Totals
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                         <C>                        <C>   <C>            <C>               <C>    <C>         <C>         <C>
Canada...................   Lake Forest, CA            -      5,508         13,785            890     5,508      14,675      20,183
Ridge Route..............   Laguna Hills, CA           -     16,261         39,559            647    16,261      40,206      56,467
Lake Forest Commerce Park.  Laguna Hills, CA           -      2,037          5,051            167     2,037       5,218       7,255
Buena Park Industrial Cntr  Buena Park, CA             -      3,245          7,703            655     3,245       8,358      11,603
Cerritos Business Center..  Cerritos, CA               -      4,218         10,273            581     4,218      10,854      15,072
Parkway Commerce Center...  Hayward, CA                -      4,398         10,433            654     4,398      11,087      15,485
Northpointe E.............  Sterling, VA               -      1,156          2,957             31     1,156       2,988       4,144
Ammendale.................  Beltsville, MD             -      4,278         18,380            721     4,278      19,101      23,379
Centrepointe..............  Landover, MD           8,751      3,801         16,708            949     3,801      17,657      21,458
Shaw Road.................  Sterling, VA           5,327      2,969         10,008            474     2,969      10,482      13,451
Creekside-Phase 1.........  Beaverton, OR              -      4,519         13,651            354     4,519      14,005      18,524
Creekside-Phase 2 Bldg-4..  Beaverton, OR              -        832          2,542             30       832       2,572       3,404
Creekside-Phase 2 Bldg-5..  Beaverton, OR              -        521          1,603              -       521       1,603       2,121
Creekside-Phase 2 Bldg-1..  Beaverton, OR              -      1,326          4,035             78     1,326       4,113       5,442
Creekside-Phase 3.........  Beaverton, OR              -      1,353          4,101             72     1,353       4,173       5,526
Creekside-Phase 5.........  Beaverton, OR              -      1,741          5,301             75     1,741       5,376       7,117
Creekside-Phase 6.........  Beaverton, OR              -      2,616          7,908            163     2,616       8,071      10,687
Creekside-Phase 7.........  Beaverton, OR              -      3,293          9,938             46     3,293       9,984      13,277
Creekside-Phase 8.........  Beaverton, OR              -      1,140          3,644             26     1,140       3,670       4,810
Woodside-Phase 1..........  Beaverton, OR              -      2,987          8,982            120     2,987       9,102      12,089
Woodside-Phase 2 Bldg-6...  Beaverton, OR              -        255            784             38       255         822       1,077
Woodside-Phase 2 Bldg-7&8.  Beaverton, OR              -      2,101          6,386            148     2,101       6,534       8,635
Woodside-Sequent 1........  Beaverton, OR              -      2,890          8,672             27     2,890       8,699      11,589
Woodside-Sequent 5........  Beaverton, OR              -      3,093          9,279              2     3,093       9,281      12,374
Northpointe G.............  Sterling, VA           1,898        824          2,964             76       824       3,040       3,864
Spectrum 95...............  Landover, MD               -      1,610          7,129            201     1,610       7,330       8,940
Las Plumas................  San Jose, CA               -      4,379         12,889            313     4,379      13,202      17,581
Lafayette.................  Chantilly, VA              -        671          4,179              4       671       4,183       4,854
Woodside-Greystone........  Beaverton, OR              -      1,262          6,966            203     1,262       7,169       8,431
Dulles South..............  Chantilly, VA          1,945        599          3,098              -       599       3,098       3,697
Sullyfield Circle.........  Chantilly, VA          2,359        774          3,712              3       774       3,715       4,489
Park East I & II..........  Chantilly, VA          6,666      2,324         10,875             14     2,324      10,889      13,213
Park East III.............  Chantilly, VA          6,372      1,527          7,154              -     1,527       7,154       8,681
Northpointe Business Cntr.  Sacramento, CA             -      3,030         13,825             70     3,030      13,895      16,925
Corporate Park Phoenix....  Phoenix, AZ                -      2,761         10,269             11     2,761      10,280      13,041
So. Shaver................  Pasadena, TX               -        464          1,184            160       464       1,344       1,808
Lamar Boulevard...........  Austin, TX                 -      2,528          6,596          1,652     2,528       8,248      10,776
N. Barker's Landing.......  Houston, TX                -      1,140          3,003            505     1,140       3,508       4,648
One Park Ten..............  San Antonio, TX            -      1,500          4,266          3,026     1,500       7,292       8,792
Park Terrace..............  San Antonio, TX            -        360            987            277       360       1,264       1,624
</TABLE>
                                                                    Depreciable
                                             Accumulated      Date     Lives
         Description          Location       Depreciation   Acquired  (Years)
- -------------------------------------------------------------------------------
Canada...................   Lake Forest, CA        723      12/23/97    5-30
Ridge Route..............   Laguna Hills, CA     2,783      12/23/97    5-30
Lake Forest Commerce Park.  Laguna Hills, CA       628      12/23/97    5-30
Buena Park Industrial Cntr  Buena Park, CA         622      12/23/97    5-30
Cerritos Business Center..  Cerritos, CA           784      12/23/97    5-30
Parkway Commerce Center...  Hayward, CA            785      12/23/97    5-30
Northpointe E.............  Sterling, VA           226      12/10/97    5-30
Ammendale.................  Beltsville, MD       2,338      1/13/98     5-30
Centrepointe..............  Landover, MD         1,816      3/20/98     5-30
Shaw Road.................  Sterling, VA         1,200      3/9/98      5-30
Creekside-Phase 1.........  Beaverton, OR        1,380      5/4/98      5-30
Creekside-Phase 2 Bldg-4..  Beaverton, OR          250      5/4/98      5-30
Creekside-Phase 2 Bldg-5..  Beaverton, OR          157      5/4/98      5-30
Creekside-Phase 2 Bldg-1..  Beaverton, OR          410      5/4/98      5-30
Creekside-Phase 3.........  Beaverton, OR          415      5/4/98      5-30
Creekside-Phase 5.........  Beaverton, OR          537      5/4/98      5-30
Creekside-Phase 6.........  Beaverton, OR          813      5/4/98      5-30
Creekside-Phase 7.........  Beaverton, OR          985      5/4/98      5-30
Creekside-Phase 8.........  Beaverton, OR          350      5/4/98      5-30
Woodside-Phase 1..........  Beaverton, OR          902      5/4/98      5-30
Woodside-Phase 2 Bldg-6...  Beaverton, OR           91      5/4/98      5-30
Woodside-Phase 2 Bldg-7&8.  Beaverton, OR          653      5/4/98      5-30
Woodside-Sequent 1........  Beaverton, OR          862      5/4/98      5-30
Woodside-Sequent 5........  Beaverton, OR          919      5/4/98      5-30
Northpointe G.............  Sterling, VA           263      6/11/98     5-30
Spectrum 95...............  Landover, MD           533      9/30/98     5-30
Las Plumas................  San Jose, CA           865      12/31/98    5-30
Lafayette.................  Chantilly, VA          212      01/29/99    5-30
Woodside-Greystone........  Beaverton, OR          127      7/15/99     5-30
Dulles South..............  Chantilly, VA           82      6/30/99     5-30
Sullyfield Circle.........  Chantilly, VA          106      6/30/99     5-30
Park East I & II..........  Chantilly, VA          316      6/30/99     5-30
Park East III.............  Chantilly, VA          207      6/30/99     5-30
Northpointe Business Cntr.  Sacramento, CA         347      7/29/99     5-30
Corporate Park Phoenix....  Phoenix, AZ              3      12/30/99    5-30
So. Shaver................  Pasadena, TX           130      1/1/97      5-30
Lamar Boulevard...........  Austin, TX             799      1/1/97      5-30
N. Barker's Landing.......  Houston, TX            351      1/1/97      5-30
One Park Ten..............  San Antonio, TX        702      1/1/97      5-30
Park Terrace..............  San Antonio, TX        124      1/1/97      5-30

                                      F-23
<PAGE>
                             PS BUSINESS PARKS, INC.
             SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
                                DECEMBER 31, 1999
                             (DOLLARS IN THOUSANDS)
<TABLE>
<CAPTION>
                                                                                          Cost
                                                                                       Capitalized
                                                                                      Subsequent to       Gross Amount at Which
                                                            Initial Cost to Company    Acquisition   Carried at December 31, 1999
                                                            ----------------------------------------------------------------------
                                                                       Buildings and   Buildings and         Buildings and
         Description           Location       Encumbrances     Land    Improvements    Improvements   Land   Improvements   Totals
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                         <C>                        <C>    <C>            <C>              <C>     <C>         <C>        <C>
La Prada..................  Mesquite, TX               -        495          1,235             95       495       1,330       1,825
NW Highway................  Garland, TX                -        480          1,203             33       480       1,236       1,716
Quail Valley..............  Missouri City, TX          -        360            918             78       360         996       1,356
Business Parkway I........  Richardson, TX             -        759          3,372            199       759       3,571       4,330
The Summit................  Plano, TX                  -      1,536          6,654            838     1,536       7,492       9,028
Northgate II..............  Dallas, TX                 -      1,274          5,505            613     1,274       6,118       7,392
Empire Commerce...........  Dallas, TX                 -        304          1,545             84       304       1,629       1,933
Royal Tech - Digital......  Las Colinas, TX            -        319          1,393              9       319       1,402       1,721
Royal Tech - Springwood...  Las Colinas, TX            -        894          3,824             94       894       3,918       4,812
Royal Tech - Regent.......  Las Colinas, TX            -        606          2,615            233       606       2,848       3,454
Royal Tech - Bldg 7.......  Las Colinas, TX            -        246          1,061              -       246       1,061       1,307
Royal Tech - NFTZ.........  Las Colinas, TX            -      1,517          6,499            109     1,517       6,608       8,125
Royal Tech - Olympus......  Las Colinas, TX            -      1,060          4,531             12     1,060       4,543       5,603
Royal Tech - Honeywell....  Las Colinas, TX            -        548          2,347              7       548       2,354       2,902
Royal Tech - Bldg 12......  Las Colinas, TX            -      1,466          6,263              7     1,466       6,270       7,736
Royal Tech - Bldg 13......  Las Colinas, TX            -        955          4,080             50       955       4,130       5,085
Royal Tech - Bldg 14......  Las Colinas, TX            -      2,010         10,242              -     2,010      10,242      12,251
Business Parkway II.......  Richardson, TX             -         40            196              4        40         200         241
Royal Tech - Bldg 15......  Irving, TX                 -      1,307          5,600            170     1,307       5,770       7,077
Westchase Corporate Park..  Houston, TX                -      2,173          7,338              5     2,173       7,343       9,516
Ben White 1...............  Austin, TX                 -        789          3,571              -       789       3,571       4,360
Ben White 5...............  Austin, TX                 -        761          3,444             15       761       3,459       4,220
McKalla 3.................  Austin, TX                 -        662          2,994             15       662       3,009       3,671
McKalla 4.................  Austin, TX                 -        749          3,390             24       749       3,414       4,163
Mopac 6...................  Austin, TX                 -        307          1,390             53       307       1,443       1,750
Waterford A...............  Austin, TX                 -        597          2,752              -       597       2,752       3,349
Waterford B...............  Austin, TX                 -        367          1,677              -       367       1,677       2,044
Waterford C...............  Austin, TX                 -      1,144          5,225              2     1,144       5,227       6,371
McNeil 6..................  Austin, TX                 -        437          2,013              8       437       2,021       2,458
Rutland 11................  Austin, TX                 -        325          1,536             10       325       1,546       1,871
Rutland 12................  Austin, TX                 -        535          2,487             39       535       2,526       3,061
Rutland 13................  Austin, TX                 -        469          2,190              5       469       2,195       2,664
Rutland 14................  Austin, TX                 -        535          2,422             16       535       2,438       2,973
Rutland 19................  Austin, TX                 -        158            762              3       158         765         923
Royal Tech  - Bldg 16.....  Las Colinas, TX            -      2,464          2,703            114     2,464       2,817       5,281
Monroe Business Center....  Herndon, VA                -      5,926         13,944            892     5,926      14,836      20,762
B & O.....................  Baltimore, MD              -      4,067          9,522          1,776     4,067      11,298      15,365
Lusk II-R&D...............  San Diego, CA              -      1,081          2,644            133     1,081       2,777       3,858
Lusk II-Office............  San Diego, CA              -      1,229          3,005            294     1,229       3,299       4,528
Norris Cn-Office..........  San Ramon, CA              -        792          1,939            185       792       2,124       2,916
</TABLE>

                                                                    Depreciable
                                             Accumulated      Date     Lives
         Description          Location       Depreciation   Acquired  (Years)
- -------------------------------------------------------------------------------
La Prada..................  Mesquite, TX            129      1/1/97      5-30
NW Highway................  Garland, TX             119      1/1/97      5-30
Quail Valley..............  Missouri City, TX        96      1/1/97      5-30
Business Parkway I........  Richardson, TX          359      5/4/98      5-30
The Summit................  Plano, TX               806      5/4/98      5-30
Northgate II..............  Dallas, TX              673      5/4/98      5-30
Empire Commerce...........  Dallas, TX              140      5/4/98      5-30
Royal Tech - Digital......  Las Colinas, TX         133      5/4/98      5-30
Royal Tech - Springwood...  Las Colinas, TX         380      5/4/98      5-30
Royal Tech - Regent.......  Las Colinas, TX         287      5/4/98      5-30
Royal Tech - Bldg 7.......  Las Colinas, TX         102      5/4/98      5-30
Royal Tech - NFTZ.........  Las Colinas, TX         644      5/4/98      5-30
Royal Tech - Olympus......  Las Colinas, TX         441      5/4/98      5-30
Royal Tech - Honeywell....  Las Colinas, TX         228      5/4/98      5-30
Royal Tech - Bldg 12......  Las Colinas, TX         609      5/4/98      5-30
Royal Tech - Bldg 13......  Las Colinas, TX         403      5/4/98      5-30
Royal Tech - Bldg 14......  Las Colinas, TX         926      5/4/98      5-30
Business Parkway II.......  Richardson, TX           17      5/4/98      5-30
Royal Tech - Bldg 15......  Irving, TX              459      11/4/98     5-30
Westchase Corporate Park..  Houston, TX               2      12/30/99    5-30
Ben White 1...............  Austin, TX              219      12/31/98    5-30
Ben White 5...............  Austin, TX              213      12/31/98    5-30
McKalla 3.................  Austin, TX              186      12/31/98    5-30
McKalla 4.................  Austin, TX              213      12/31/98    5-30
Mopac 6...................  Austin, TX               93      12/31/98    5-30
Waterford A...............  Austin, TX              156      1/06/99     5-30
Waterford B...............  Austin, TX               57      5/20/99     5-30
Waterford C...............  Austin, TX              178      5/20/99     5-30
McNeil 6..................  Austin, TX              115      1/6/9       5-30
Rutland 11................  Austin, TX               86      1/6/99      5-30
Rutland 12................  Austin, TX              147      1/6/99      5-30
Rutland 13................  Austin, TX              123      1/6/99      5-30
Rutland 14................  Austin, TX              151      12/31/98    5-30
Rutland 19................  Austin, TX               42      1/6/99      5-30
Royal Tech  - Bldg 16.....  Las Colinas, TX          56      7/1/99      5-30
Monroe Business Center....  Herndon, VA           1,483      8/1/97      5-30
B & O.....................  Baltimore, MD         1,102      8/1/97      5-30
Lusk II-R&D...............  San Diego, CA           173      3/17/98     5-30
Lusk II-Office............  San Diego, CA           217      3/17/98     5-30
Norris Cn-Office..........  San Ramon, CA           239      3/17/98     5-30

                                      F-24
<PAGE>
                            PS BUSINESS PARKS, INC.
             SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
                                DECEMBER 31, 1999
                             (DOLLARS IN THOUSANDS)
<TABLE>
<CAPTION>
                                                                                     Cost
                                                                                  Capitalized
                                                                                  Subsequent to    Gross Amount at Which Carried
                                                       Initial Cost to Company     Acquisition           at December 31, 1999
                                                       ---------------------------------------------------------------------------
                                                                Buildings and     Buildings and            Buildings and
         Description      Location     Encumbrances     Land    Improvements       Improvements   Land     Improvements    Totals
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                     <C>                <C>       <C>            <C>             <C>       <C>            <C>         <C>
Norris Cn-R&D.........  San Ramon, CA            -        696          1,703             79        696          1,782       2,478
Northpointe D.........  Sterling, VA         1,640        787          2,882              9        787          2,891       3,678
Monroe II.............  Herndon, VA          2,108        811          4,967            164        811          5,131       5,942
Kearny Mesa-Office....  San Diego, CA            -        790          1,933            356        790          2,289       3,079
Kearny Mesa-R&D.......  San Diego, CA            -      2,108          5,156            146      2,108          5,302       7,410
Bren Mar-Office.......  Alexandria, VA           -        573          1,401            412        573          1,813       2,386
Lusk III..............  San Diego, CA            -      1,906          4,662            217      1,906          4,879       6,785
Bren Mar-R&D..........  Alexandria, VA           -      1,627          3,979             78      1,627          4,057       5,684
Alban Road-Office.....  Springfield, VA          -        989          2,418            527        989          2,945       3,934
Alban Road-R&D........  Springfield, VA          -        948          2,318            110        948          2,428       3,376
                                         ------------------------------------------------------------------------------------------
                                           $37,066   $198,671       $615,771        $31,196   $198,671       $646,967    $845,638
                                         ==========================================================================================
</TABLE>
                                                                 Depreciable
                                        Accumulated      Date      Lives
         Description      Location      Depreciation   Acquired   (Years)
- -----------------------------------------------------------------------------
Norris Cn-R&D.........  San Ramon, CA           12     3/17/98       5-30
Northpointe D.........  Sterling, VA           252     6/11/98       5-30
Monroe II.............  Herndon, VA            284     1/29/99       5-30
Kearny Mesa-Office....  San Diego, CA          156     3/17/98       5-30
Kearny Mesa-R&D.......  San Diego, CA          322     3/17/98       5-30
Bren Mar-Office.......  Alexandria, VA         158     3/17/98       5-30
Lusk III..............  San Diego, CA          301     3/17/98       5-30
Bren Mar-R&D..........  Alexandria, VA         246     3/17/98       5-30
Alban Road-Office.....  Springfield, VA        199     3/17/98       5-30
Alban Road-R&D........  Springfield, VA        150     3/17/98       5-30
                                         -----------
                                           $51,978
                                         ===========


                                      F-25
<PAGE>



                             PS BUSINESS PARKS, INC.
             SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
                                DECEMBER 31, 1999



A summary  of  activity  for real  estate  and  accumulated  depreciation  is as
follows:

<TABLE>
<CAPTION>

  Reconciliation of real estate:
                                                        Years Ended December 31,
                                          -----------------------------------------------------
                                                1999              1998              1997
                                          ---------------  ----------------- ------------------
  <S>                                     <C>              <C>               <C>
  Balance at beginning of period......    $ 712,938,000      $ 318,220,000    $            -
  Additions during period:
    Acquisitions......................      102,839,000        378,321,000       314,655,000
    Developed projects................       13,650,000                  -                 -
    Property held for disposition.....      (15,237,000)                 -                 -
    Additional costs relating to prior
       year's acquisitions............                -          5,306,000                 -
    Improvements......................       16,211,000         11,091,000         3,565,000
                                          ---------------  ----------------- ------------------
  Balance at close of period..........    $ 830,401,000      $ 712,938,000    $  318,220,000
                                          ===============  ================= ==================

  Reconciliation of accumulated depreciation:


                                                        Years Ended December 31,
                                          -----------------------------------------------------
                                               1999              1998              1997
                                          ---------------  ----------------- ------------------
  Balance at beginning of period......    $  22,517,000    $   3,982,000     $            -
  Additions during period:
    Property held for disposition.....       (1,002,000)               -                  -
    Depreciation......................       29,461,000       18,535,000          3,982,000
                                          ---------------  ----------------- ------------------
  Balance at close of period..........    $  50,976,000    $  22,517,000     $    3,982,000
                                          ===============  ================= ==================

</TABLE>


The unaudited  adjusted  basis of real estate  facilities for Federal income tax
purposes was approximately $712 million at December 31, 1999.

                                      F-26

<TABLE>
<CAPTION>

                                                                                                   For the Period    For the Period
                                                                 For the Year      For the Year        April 1         January 1,
                                                                    Ended             Ended            through          through
                                                                 December 31,      December 31,     December 31,        March 31,
                                                               ---------------   ----------------  ---------------- ---------------
Basic and Diluted Earnings Per Share:                                1999              1998             1997              1997
                                                               ---------------   ----------------  ---------------- ---------------

<S>                                                            <C>               <C>               <C>              <C>
Net income allocable to common shareholders...............      $ 37,849,000     $  29,400,000     $  3,154,000      $    682,000
                                                               ===============   ================  ================ ===============

Weighted average common shares outstanding:
   Basic weighted average common shares outstanding.......        23,641,000        19,361,000        3,414,000         2,193,000
   Net  effect  of  dilutive   stock   options - based  on
     treasury stock method using average market price.....            68,000            68,000           12,000                 -
                                                               ---------------   ----------------  ---------------- ---------------
   Diluted weighted average common shares outstanding.....        23,709,000        19,429,000        3,426,000         2,193,000
                                                               ===============   ================  ================ ===============

Basic earnings per common share...........................      $       1.60      $       1.52     $       0.92      $       0.31
                                                               ===============   ================  ================ ===============
Diluted earnings per common share.........................      $       1.60      $       1.51     $       0.92      $       0.31
                                                               ===============   ================  ================ ===============
</TABLE>

<TABLE>
<CAPTION>
                                                                   Years Ended December 31,
                                        --------------------------------------------------------------------------------
                                            1999             1998            1997             1996            1995
                                        --------------  ---------------  ---------------  --------------  --------------
<S>                                     <C>             <C>              <C>              <C>             <C>
Net income.........................     $ 41,255,000     $ 29,400,000    $  3,836,000     $    519,000    $  1,192,000
Minority interest..................       16,049,000       11,208,000       8,566,000                -               -
Interest expense...................        3,153,000        2,361,000           1,000                -               -
                                        --------------  ---------------  ---------------  --------------  --------------
Earnings available to cover fixed
   charges.........................     $60,457,000      $ 42,969,000    $ 12,403,000     $    519,000    $  1,192,000
                                        ==============  ===============  ===============  ==============  ==============


Fixed charges (1)..................     $  4,142,000     $  2,629,000    $      1,000     $          -    $          -
Preferred distributions............        7,562,000                -               -                -               -
                                        --------------  ---------------  ---------------  --------------  --------------
Combined  fixed charges and
   preferred distributions.........     $ 11,704,000     $  2,629,000    $      1,000     $          -    $          -
                                        ==============  ===============  ===============  ==============  ==============

Ratio of earnings to fixed charges.            14.60            16.34          12,403         N/A              N/A
                                        ==============  ===============  ===============  ==============  ==============

Ratio of earnings to combined fixed
   charges and preferred
   distributions...................             5.17            16.34          12,403         N/A              N/A
                                        ==============  ===============  ===============  ==============  ==============
</TABLE>

Supplemental  disclosure  of Ratio of Funds  from  Operations  ("FFO")  to fixed
charges:

<TABLE>
<CAPTION>
                                                                   Years Ended December 31,
                                        --------------------------------------------------------------------------------
                                            1999             1998            1997             1996            1995
                                        --------------  ---------------  ---------------  --------------  --------------
<S>                                     <C>             <C>              <C>              <C>             <C>
FFO................................     $ 76,353,000     $ 57,430,000    $ 17,597,000     $    303,000    $    720,000
Interest expense...................        3,153,000        2,361,000           1,000                -               -
Minority  interest in income -
   preferred units.................        4,156,000                -               -                -               -
Preferred dividends................        3,406,000                -               -                -               -
                                        --------------  ---------------  ---------------  --------------  --------------
Adjusted FFO  available to cover
   fixed charges...................     $ 87,068,000     $ 59,791,000    $ 17,598,000     $    303,000    $    720,000
                                        ==============  ===============  ===============  ==============  ==============

Fixed charges (1)..................     $  4,142,000     $  2,629,000    $      1,000     $          -    $          -
Preferred distributions............        7,562,000                -               -                -               -
                                        --------------  ---------------  ---------------  --------------  --------------
Combined   fixed    charges    and
   preferred distributions.........     $ 11,704,000     $  2,629,000    $      1,000     $          -    $          -
                                        ==============  ===============  ===============  ==============  ==============

Ratio of FFO to fixed charges......            21.02            22.74          17,598         N/A              N/A
                                        ==============  ===============  ===============  ==============  ==============
Ratio of FFO to combined fixed
   charges and preferred
   distributions...................             7.44            22.74          17,598         N/A              N/A
                                        ==============  ===============  ===============  ==============  ==============
</TABLE>

(1) Fixed charges include interest expense plus capitalized interest.




                                                                     EXHIBIT 23


                         CONSENT OF INDEPENDENT AUDITORS

We consent to the  incorporation by reference in the  Registration  Statement on
Form S-8  (No.  333-48313)  of PS  Business  Parks,  Inc.  pertaining  to the PS
Business Parks,  Inc. 1997 Stock Option and Incentive Plan, and the Registration
Statement  on Form S-3 (No.  333-78627)  and in the  related  prospectus  of our
report  dated  January  31,  2000 with  respect  to the  consolidated  financial
statement and schedule of PS Business Parks,  Inc. included in the Annual Report
(Form 10-K) for the year ended  December 31, 1999 filed with the  Securities and
Exchange Commission.



                                                           /s/ ERNST & YOUNG LLP





Los Angeles, California
March 29, 2000




<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>



                             PS BUSINESS PARKS. INC.
                      EXHIBIT 27 - FINANCIAL DATA SCHEDULE
                           ARTICLE 5 OF REGULATION S-X

</LEGEND>
<CIK>                                                                 0000866368
<NAME>                                                   PS Business Parks, Inc.
<MULTIPLIER>                                                                   1
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<EPS-DILUTED>                                                               1.60



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