PS BUSINESS PARKS INC/CA
8-K/A, 1998-04-20
REAL ESTATE INVESTMENT TRUSTS
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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


                                   FORM 8-K/A
                                 AMENDMENT No. 1

                Current Report Pursuant to Section 13 or 15(d) of
                      The Securities Exchange Act of 1934


         Date of Report (Date of earliest event reported) April 17, 1998
                    (Amending Form 8-K dated March 17, 1998)




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


          California                   1-10709                 95-4300881
- ------------------------------      -------------       ------------------------
(State or Other Jurisdiction         (Commission             I.R.S. Employer
      of Incorporation)              File Number)        Identification Number)


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


       Registrant's telephone number, including area code: (818) 244-8080
                                                           --------------

                       PUBLIC STORAGE PROPERTIES XI, INC.
                       ----------------------------------
          (Former name or former address, if changed since last report)



<PAGE>



Item 7. Financial Statements and Exhibits

         (a)(i)   Financial Statements
                  --------------------

                  Report of Independent Auditors

                  Balance Sheets as of December 31, 1997 and 1996

                  For the period  April 1, 1997 through  December 31, 1997,  the
                  period  January 1, 1997 through March 31, 1997,  and the years
                  ended December 31, 1996 and December 31, 1995:

                           Consolidated Statements of Income

                           Consolidated Statements of Shareholders' Equity

                           Consolidated Statements of Cash Flow

                           Notes to Consolidated Financial Statements

         (a)(ii)   Management's  Discussion and Analysis of Financial  Condition
                   -------------------------------------------------------------
                   and the Results of Operations
                   -----------------------------

         (b)      Pro forma Consolidated Financial Statements
                  -------------------------------------------

         (c)      Exhibits
                  --------

                  23.       Consent of Independent Auditors.
               
                  27.       Financial Data Schedule



                                   SIGNATURES

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


                                                         PS BUSINESS PARKS, INC.


Date:  April 17, 1998                              By: /s/ Ronald L. Havner, Jr.
                                                      --------------------------
                                                           Ronald L. Havner, Jr.
                                           President and Chief Executive Officer



<PAGE>


Item 7 (a) (i)
- --------------




                         REPORT OF INDEPENDENT AUDITORS
                         ------------------------------




The Board of Directors and Shareholders
PS Business Parks, Inc. (successor to  American Office Park Properties, Inc.)


We have  audited the  accompanying  consolidated  balance  sheets of PS Business
Parks,  Inc. as of  December  31,  1997 and 1996,  and the related  consolidated
statements of income,  shareholders'  equity, and cash flows for the period from
April 1, 1997 through  December 31, 1997, from January 1, 1997 through March 31,
1997, and the years ended December 31, 1996 and 1995. These financial statements
are the  responsibility of the Company's  management.  Our  responsibility is to
express an opinion on these financial statements based on our audits.

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

In our opinion, the consolidated  financial statements referred to above present
fairly,  in all material  respects,  the consolidated  financial  position of PS
Business  Parks,  Inc.  at December  31,  1997 and 1996,  and the results of its
operations and its cash flows for the period from April 1, 1997 through December
31,  1997,  from January 1, 1997  through  March 31,  1997,  and the years ended
December 31, 1996 and 1995 in  conformity  with  generally  accepted  accounting
principles.




                                                        ERNST & YOUNG LLP





Los Angeles, California
February 23, 1998 except for Note 9 as to which the date is March 18, 1998


<PAGE>



                             PS BUSINESS PARKS, INC.

              (SUCCESSOR TO AMERICAN OFFICE PARK PROPERTIES, INC.)
                           CONSOLIDATED BALANCE SHEETS
                           December 31, 1997 and 1996
<TABLE>
<CAPTION>

                                                                          December 31,            December 31,
                                                                              1997                    1996
                                                                      --------------------    ------------------
                                     ASSETS
                                     ------


<S>                                                                     <C>                     <C>            
Cash and cash equivalents.............................                  $     3,884,000         $       919,000

Real estate facilities, at cost:
     Land.............................................                       91,754,000                       -
     Buildings........................................                      226,466,000                       -
                                                                      --------------------    ------------------
                                                                            318,220,000                       -
     Accumulated depreciation.........................                       (3,982,000)                      -
                                                                      --------------------    ------------------
                                                                            314,238,000
Intangible assets, net................................                        3,272,000                       -
Receivable from affiliate.............................                                -                 827,000
Other assets..........................................                        2,060,000                 195,000
                                                                      --------------------    ------------------
              Total assets............................                  $   323,454,000         $     1,941,000
                                                                      ====================    ==================


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


Accrued and other liabilities............................               $     8,331,000         $       207,000
Note payable to affiliate................................                     3,500,000                       -
Minority interest........................................                   168,665,000                       -

Shareholders' equity:
   Preferred  Stock,  $0.10  par  value,  
     $15,010,000   aggregate   liquidation
     preference, 100,000,000 shares authorized,
     899,608 shares outstanding at December 31, 
     1996 (none at December 31, 1997)..................;.                             -                  90,000

   Common  stock,  $0.10 par value,  100,000,000  
     shares  authorized,  7,728,309 shares issued
     and  outstanding  at December 31, 1997
     (94,697  shares issued and outstanding 
     at December 31, 1996)...............................                       773,000                   9,000
   Paid-in capital.......................................                   142,581,000               1,484,000
   Retained earnings.....................................                     3,154,000                 151,000
   Cumulative distributions..............................                    (3,550,000)                      -
                                                                      --------------------    ------------------
         Total shareholders' equity......................                   142,958,000               1,734,000
                                                                      --------------------    ------------------
              Total liabilities and shareholders' equity.               $   323,454,000         $     1,941,000
                                                                      ====================    ==================

</TABLE>
                            See accompanying notes.
                                       2
<PAGE>


                             PS BUSINESS PARKS, INC.
              (SUCCESSOR TO AMERICAN OFFICE PARK PROPERTIES, INC.)
                        CONSOLIDATED STATEMENTS OF INCOME


<TABLE>
<CAPTION>

                                                For the Periods (Note 2)              For the Years Ended December 31,
                                        ----------------------------------------  ----------------------------------------
                                            April 1, 1997      January 1, 1997
                                              through              through            
                                         December 31, 1997      March 31, 1997           1996                 1995
                                        -------------------   ------------------  -------------------  -------------------

Revenues:
<S>                                      <C>                   <C>                 <C>                  <C>            
   Rental income..............           $    24,364,000       $     5,805,000     $             -      $             -
   Facility management fees
    primarily from affiliates.                   709,000               247,000           2,133,000            2,044,000
   Interest and other income..                   424,000                29,000              43,000               37,000
                                        -------------------   ------------------  -------------------  -------------------
                                              25,497,000             6,081,000           2,176,000            2,081,000
                                        -------------------   ------------------  -------------------  -------------------

Expenses:
  Cost of operations..........                 9,837,000             2,493,000                   -                    -
  Cost of facility management.                   129,000                60,000             514,000              570,000
  Depreciation and                             
    amortization..............                 4,375,000               820,000                   -                    -
  General and administrative..                 1,248,000               213,000           1,143,000              319,000
   Interest expense...........                     1,000                     -                   -                    -
                                        -------------------   ------------------  -------------------  -------------------
                                              15,590,000             3,586,000           1,657,000              889,000
                                        -------------------   ------------------  -------------------  -------------------

Income before minority
    interest and income taxes.                 9,907,000             2,495,000             519,000            1,192,000

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

Income before income taxes....                 3,154,000               682,000                   -                    -

Income tax expense............                         -                     -            (216,000)            (472,000)
                                        -------------------   ------------------  -------------------  -------------------

Net income....................           $     3,154,000       $       682,000     $       303,000      $       720,000
                                        ===================   ==================  ===================  ===================


Net income per share:
    Basic.....................           $         0.92        $         0.31      $         0.32       $         0.80
                                        ===================   ==================  ===================  ===================
    Diluted...................           $         0.92        $         0.31      $         0.32       $         0.80
                                        ===================   ==================  ===================  ===================

Weighted average shares outstanding:
    Basic.....................                 3,414,069             2,192,848             946,956              905,472
                                        ===================   ==================  ===================  ===================
    Diluted...................                 3,426,574             2,192,848             946,956              905,472
                                        ===================   ==================  ===================  ===================
</TABLE>
                            See accompanying notes.
                                       3
<PAGE>


                             PS BUSINESS PARKS, INC.
              (SUCCESSOR TO AMERICAN OFFICE PARK PROPERTIES, INC.)
                       STATEMENTS OF SHAREHOLDERS' EQUITY
           For the periods from January 1, 1997 through March 31, 1997
         and April 1, 1997 through December 31, 1997 and for the years
                        ended December 31, 1996 and 1995

<TABLE>
<CAPTION>
                                                       Preferred Stock              Common Stock
                                                     -----------------------     ----------------------                      
                                                       Shares       Amount        Shares         Amount      Paid-in Capital 
                                                     ----------  -----------     ---------    ---------      --------------- 

<S>                                                 <C>          <C>              <C>        <C>            <C>              
Balances at December 31, 1994...............                 -   $        -        2,950      $   3,000      $           -   
   Issuance of common stock for cash........                 -            -       47,348          5,000            785,000   
   Exchange of common stock for preferred
     stock..................................           899,608       90,000       (2,950)        (3,000)           (87,000)  
   Net income...............................                 -            -            -              -                  -   
   Distributions............................                 -            -            -              -                  -   
                                                     ----------  -----------   -----------    ---------      --------------- 

Balances at December 31, 1995...............           899,608       90,000       47,348          5,000            698,000   
   Issuance of common stock for cash .......                 -            -       47,349          5,000            785,000   
   Net income...............................                 -            -            -              -                  -   
   Distributions............................                 -            -            -              -                  -   
                                                     ----------  -----------   -----------    ---------      --------------- 

Balances at December 31, 1996...............           899,608       90,000       94,697         10,000          1,483,000   
  Issuance of preferred stock in exchange
     for real estate facilities.............         1,198,680      120,000            -              -         19,880,000   
  Net income................................                 -            -            -              -                  -   
  Issuance of common stock for cash.........                 -            -        4,797              -             80,000   
  Adjustment to reflect cost of PSI's
     investment in PSBP.....................                 -            -            -              -         12,361,000   
  Exchange of preferred stock for common
     stock..................................        (2,098,288)    (210,000)   2,098,288        210,000            833,000   
  Adjustment to reflect minority interests'
     to underlying ownership interest.......                 -            -            -              -          1,813,000   
                                                     ----------  -----------   -----------    ---------      --------------- 

Balances at March 31, 1997..................                 -            -    2,197,782        220,000         36,450,000   
  Issuance of common stock for cash.........                 -            -    2,025,769        203,000         33,597,000   
  Issuance of common stock in exchange for
     real estate facilities.................                 -            -    3,504,758        350,000         75,624,000   
  Net income................................                 -            -            -              -                  -   
  Distributions.............................                 -            -            -              -                  -   
  Adjustment to reflect minority interests'
     to underlying ownership interest.......                 -            -            -              -         (3,090,000)  
                                                     ----------  -----------   -----------    ---------      --------------- 

Balances at December 31, 1997...............                 -    $       -    7,728,309      $ 773,000     $  142,581,000   
                                                     ==========  ===========   ===========    =========      =============== 
</TABLE>

<TABLE>
<CAPTION>
                                                        Retained        Accumulated    Shareholders'
                                                          Earnings     Distributions       Equity
                                                       -------------  -------------- ----------------

<S>                                                   <C>             <C>            <C>          
Balances at December 31, 1994...............           $    343,000    $          -   $     346,000
   Issuance of common stock for cash........                      -               -         790,000
   Exchange of common stock for preferred
     stock..................................                      -               -               -
   Net income...............................                720,000               -         720,000
   Distributions............................               (815,000)              -        (815,000)
                                                       -------------  -------------- ----------------

Balances at December 31, 1995...............                248,000               -       1,041,000
   Issuance of common stock for cash .......                      -               -         790,000
   Net income...............................                303,000               -         303,000
   Distributions............................               (400,000)              -        (400,000)
                                                       -------------  -------------- ----------------

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 PSBP.....................                      -               -      12,361,000
  Exchange of preferred stock for common
     stock..................................               (833,000)              -               -
  Adjustment to reflect minority interests'
     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.............................                      -      (3,550,000)     (3,550,000)
  Adjustment to reflect minority interests'
     to underlying ownership interest.......                      -               -      (3,090,000)
                                                       -------------  -------------- ----------------

Balances at December 31, 1997...............           $  3,154,000   $  (3,550,000)  $ 142,958,000
                                                       =============  ============== ================
</TABLE>
                            See accompanying notes.
                                       4

<PAGE>


                             PS BUSINESS PARKS, INC.
              (SUCCESSOR TO AMERICAN OFFICE PARK PROPERTIES, INC.)
                      CONSOLIDATED STATEMENTS OF CASH FLOWS


<TABLE>
<CAPTION>

                                                         For the Periods (Note 2)             For the Years Ended December 31,
                                                     -----------------------------------    ----------------------------------
                                                      April 1, 1997       January 1,
                                                         through         1997 through
                                                       December 31,        March 31,        
                                                           1997              1997               1996                1995
                                                     ----------------    ---------------    ---------------    ---------------
CASH FLOWS FROM OPERATING ACTIVITIES:
   <S>                                                 <C>                 <C>               <C>                <C>         
   Net income......................................    $  3,154,000        $   682,000       $    303,000       $    720,000
   Adjustments  to  reconcile  net  income  to 
    net cash  provided  by  operating activities:
       Depreciation and amortization expense.......       4,375,000             820,000                 -                  -
       Minority interest in income.................       6,753,000           1,813,000                 -                  -
       (Increase) decrease in other assets.........      (1,465,000)           (400,000)          (28,000)           157,000
       Increase in accrued and other liabilities...         780,000           2,925,000           138,000             73,000
                                                     ----------------    ---------------    ---------------    ---------------

            Total adjustments......................      10,443,000           5,158,000           110,000            230,000
                                                     ----------------    ---------------    ---------------    ---------------

         Net cash provided by operating activities.      13,597,000           5,840,000           413,000            950,000
                                                     ----------------    ---------------    ---------------    ---------------

CASH FLOWS FROM INVESTING ACTIVITIES:
       Acquisition of real estate facilities.......     (44,122,000)                  -                 -                  -
       Capital expenditures........................      (2,983,000)           (582,000)                -                  -
                                                     ----------------    ---------------    ---------------    ---------------

         Net cash used in investing activities.....     (47,105,000)           (582,000)                -                  -
                                                     ----------------    ---------------    ---------------    ---------------

CASH FLOWS FROM FINANCING ACTIVITIES:
       Proceeds from note payable to affiliate.....       3,500,000                   -                 -                  -
       Decrease (increase) in receivable from              
       affiliate...................................       1,135,000            (308,000)         (768,000)           (59,000)
       Net proceeds from the issuance of
         common stock...............................     33,800,000              80,000           790,000            790,000
       Dividends paid to shareholders..............      (3,550,000)                  -          (400,000)          (815,000)
       Distributions to minority interests.........      (3,442,000)                  -                 -                  -
                                                     ----------------    ---------------    ---------------    ---------------

         Net cash provided by (used in) financing
         activities................................      31,443,000            (228,000)         (378,000)           (84,000)
                                                     ----------------    ---------------    ---------------    ---------------

Net (decrease) increase in cash and cash                 (2,065,000)          5,030,000            35,000            866,000
 equivalents.......................................

Cash and cash equivalents at the beginning of
   the period......................................       5,949,000             919,000           884,000             18,000
                                                     ----------------    ---------------    ---------------    ---------------

Cash and cash equivalents at the end of the period.    $  3,884,000        $ 5,949,000       $    919,000       $    884,000
                                                     ================    ===============    ===============    ===============
</TABLE>
                            See accompanying notes.
                                       5
<PAGE>


<TABLE>
<CAPTION>

                                                       For the Periods (Note 2)           For the Years Ended December 31,
                                                  ----------------------------------    ----------------------------------
                                                   April 1, 1997        January 1,
                                                      through          1997 through
                                                    December 31,        March 31,         
                                                       1997               1997                1996                1995
                                                 ----------------    ---------------    ---------------    ---------------
SUPPLEMENTAL SCHEDULE OF NON CASH INVESTING
AND FINANCIAL ACTIVITIES:

Acquisitions  of real estate  facilities  in exchange  for  preferred  stock and
   minority interests:
       <S>                                         <C>                <C>                <C>                 <C>          
       Real estate facilities...................   $(146,207,000)     $(117,180,000)     $           -       $           -
       Intangible assets........................         730,000                   -                  -                   -
       Accrued and other liabilities............       4,419,000                   -                  -                   -
       Minority interest........................      65,084,000          97,180,000                  -                   -
       Preferred stock..........................         350,000             120,000                  -                   -
       Paid in capital .........................      75,624,000          19,880,000                  -                   -

Exchange of preferred stock for common stock:
       Preferred Stock..........................               -            (210,000)                 -                   -
       Common Stock.............................               -             210,000                  -                   -

Adjustment to reflect PSI's acquisition cost:
       Real estate facilities...................               -          (7,146,000)                 -                   -
       Accumulated depreciation.................               -            (820,000)                 -                   -
       Intangible assets........................               -          (4,395,000)                 -                   -
       Paid in capital..........................               -          12,361,000                  -                   -


</TABLE>
                            See accompanying notes.
                                       6

<PAGE>


                             PS BUSINESS PARKS INC.
              (SUCCESSOR TO AMERICAN OFFICE PARK PROPERTIES, INC.)
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                DECEMBER 31, 1997


1.       ORGANIZATION AND DESCRIPTION OF BUSINESS

                  PS Business Parks,  Inc. ("PSBP") is the successor to American
         Office Park Properties, Inc. ("AOPP") and the survivor in the merger of
         AOPP into Public  Storage  Properties  XI, Inc.  ("PSP11") on March 17,
         1998.  Based  upon the  terms of the  merger  (Note 9),  for  financial
         reporting and accounting purposes the merger will be 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 PSBP prior to March
         17, 1998, refer to AOPP.

                  PSBP was  organized in  California  in 1986 as a  wholly-owned
         subsidiary of Public Storage  Management,  Inc.  ("PSMI"),  a privately
         owned  company  of  B.  Wayne  Hughes  and  his  family   (collectively
         "Hughes").

                  On November 16, 1995,  Public Storage,  Inc.  ("PSI") acquired
         PSMI in a business combination accounted for using the purchase method.
         In connection with the transaction,  PSI exchanged its common stock for
         all  of  the  non-voting   participating   preferred   stock  of  PSBP,
         representing  a 95% economic  interest,  and Hughes  purchased  all the
         voting  common stock of PSBP,  representing  the  remaining 5% economic
         interest.  During  December  1996,  Ronald  L.  Havner,  Jr.  (then  an
         executive officer of PSI) acquired all of Hughes' common stock in PSBP.

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

                  Subject to certain limitations as described in Note 5, holders
         of OP Units,  other than PSBP, have the right to require PSBP 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.

                  On March 31, 1997, PSI exchanged its non-voting  participating
         preferred  stock  into  common  shares  of  PSBP.  As a  result  of the
         exchange,  PSI  owned  a  majority  of  the  voting  common  stock  and
         effectively gained control of PSBP at that time.

                  From  1986  through  1996,  PSBP's  sole  business  activities
         consisted of the property management of commercial  properties owned by
         PSI and affiliated entities.  Commencing in 1997, PSBP began to own and
         operate commercial properties for its own behalf. At December 31, 1997,
         PSBP and the Operating  Partnership  collectively owned and operated 49
         commercial  properties  (approximately  6.0 million net rentable square
         feet)  located in 10 states.  In addition,  on December  31, 1997,  the
         Operating  Partnership managed on behalf of PSI and affiliated entities
         49  additional  commercial  properties  (approximately  1.9 million net
         rentable square feet).

2.       SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

         Basis of presentation:

                  The financial statements for fiscal 1996 and 1995 include only
         the accounts of PSBP. The  consolidated  financial  statements for 1997
         include the accounts of PSBP and the  Operating  Partnership.  PSBP, as

                                       7
<PAGE>

         the sole  general  partner  of the  Operating  Partnership,  has  full,
         exclusive and complete  responsibility  and  discretion in managing and
         controlling the Operating  Partnership.  PSI owned approximately 53% of
         the  outstanding  common stock of PSBP at December  31, 1997,  with the
         remainder  owned  primarily by a subsidiary  of a state  pension  plan.
         Historical  financial  data of  PSP11  have not  been  included  in the
         historical financial statements of PSBP.

                  On  March  31,  1997,  PSBP and PSI  agreed  to  exchange  the
         non-voting  participating  preferred  stock  held by PSI for  2,098,288
         shares of voting common stock of PSBP. After the exchange, PSI owned in
         excess of 95% of the outstanding common voting common stock of PSBP and
         PSBP  accounted  for  the   transaction  as  if  PSI  purchased   PSBP.
         Accordingly,  PSBP  reflected  PSI's cost of its  investment in PSBP in
         accordance with Accounting Principles Board Opinion No. 16. As a result
         of PSI attaining  control of PSBP,  the carrying value of PSBP's assets
         and liabilities were adjusted to reflect PSI's  acquisition cost of its
         controlling interest in PSBP 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 PSBP was held by entities
         other than PSI.  As a result of PSI  acquiring a majority of the voting
         common  stock  and  control  of  PSBP  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.

         Stock-based compensation

                  In October 1995,  the  Financial  Accounting  Standards  Board
         ("FASB") issued Statement of Financial  Accounting  Standards  ("SFAS")
         No. 123  "Accounting for Stock-Based  Compensation"  ("Statement  123")
         which provides  companies an alternative to accounting for  stock-based
         compensation  as  prescribed  under  APB  Opinion  No.  25 ("APB  25").
         Statement 123 encourages,  but does not require  companies to recognize
         expense  for  stock-based  awards  based on their fair value at date of
         grant.  Statement 123 allows  companies to continue to follow  existing
         accounting  rules  (intrinsic  value method under APB 25) provided that
         pro-forma  disclosures  are made of what net  income and  earnings  per
         share  would have been had the new fair  value  method  been used.  The
         Company has elected to adopt the disclosure  requirements  of Statement
         123  but  will  account  for  stock-based  compensation  under  APB 25.
         Statement 123's  disclosure  requirements are applicable to stock-based
         awards granted in fiscal years beginning after December 15, 1994.

         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 PSBP was converted into
         common  stock on a share  for  share  basis.  In  December  1997,  PSBP
         declared a common  stock  dividend at a rate of .01583  shares for each
         common  share  outstanding.   Similarly,  the  Operating  Partnership's
         outstanding  OP Units  were  adjusted  in  December  1997 to reflect an
         increase of .01583 OP Units for each OP Unit outstanding. 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,  PSBP'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.

                                       8
<PAGE>

                  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/per  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.

         Cash and cash equivalents:

                  PSBP considers all highly liquid  investments with an original
         maturity  of three  months or less at the date of  purchase  to be cash
         equivalents.

         Real estate facilities:

                  Costs  related  to  the   improvements   of   properties   are
         capitalized.  Expenditures  for repair and  maintenance  are charged to
         expense when incurred.  After March 31, 1997, acquisition of facilities
         from  PSI  and  entities   controlled   by  PSI  are  recorded  at  the
         predecessor's basis until such time that PSBP is not controlled by PSI.
         Buildings  and equipment  are  depreciated  on the straight line method
         over the  estimated  useful  lives,  which is generally 25 and 5 years,
         respectively.

         Intangible assets:

                  Intangible assets consist of property management contracts for
         properties  managed,  but not owned, by PSBP. The intangible assets are
         being   amortized   over  seven  years.   As  properties   managed  are
         subsequently  acquired by PSBP,  the  unamortized  basis of  intangible
         assets  related to such property is included in the cost of acquisition
         of such property. During April 1997, PSBP acquired four properties from
         PSI and  included  in the  cost  of real  estate  facilities  for  such
         properties  are $730,000 of cost  previously  classified  as intangible
         assets.  Intangible  assets at December 31, 1997 are net of accumulated
         amortization  of  $393,000,  which  reflects the  amortization  for the
         period April 1, 1997 through December 31, 1997.

         Evaluation of asset impairment:

                  In 1995,  the FASB issued SFAS No.  121,  "Accounting  for the
         Impairment  of  Long-Lived  Assets  and  for  Long-Lived  Assets  to be
         Disposed  Of"  which  requires  impairment  losses  to be  recorded  on
         long-lived  assets.  PSBP 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.  Statement  121  also
         addresses the accounting for long-lived  assets that are expected to be
         disposed  of.  Such  assets  are to be  reported  at the lower of their
         carrying  amount  or fair  value,  less  cost  to  sell.  PSBP  adopted
         Statement 121 in 1996 and the adoption had no effect. PSBP's subsequent
         evaluations  have indicated no impairment in the carrying amount of its
         assets.

         Note payable to affiliate:

                  Note payable to  affiliate at December 31, 1998 of  $3,500,000
         reflects  borrowings  from PSI which  occurred  on that date.  The note
         bears interest at 6.97% ($1,000 of interest  expense was paid in 1997),
         and was repaid on January 31, 1998.

                                       9
<PAGE>


         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.

         Net income per common share:

                  In 1997,  the FASB issued SFAS No.  128,  Earnings  per Share.
         Statement 128 replaced the calculation of "primary" and "fully diluted"
         earnings  per share with  "basic"  and  "diluted"  earnings  per share.
         PSBP's  adoption  of  this  accounting  standard  has  no  impact  upon
         previously reported earnings per share.

                  "Diluted" shares include the dilutive effect of stock options,
         while "basic" shares exclude such effect. In addition, weighted average
         shares  utilized  in  computing  basic and diluted  earnings  per share
         includes the weighted average participating  preferred shares,  because
         such shares were allocated income (subject to certain  preferences upon
         liquidation  described  below)  on an equal per  share  basis  with the
         common shares.

         Income taxes:

                  Prior to November 16, 1995,  PSBP's  earnings were included in
         the consolidated federal and combined state income tax returns of PSMI.
         Under the terms of a tax sharing  agreement,  taxes were  allocated  to
         PSBP as though it filed  separate  federal and state tax  returns.  For
         periods  subsequent  to November 16, 1995,  separate  federal and state
         income tax returns were filed for PSBP.

                  Income taxes are accounted for under SFAS No. 109, "Accounting
         for Income Taxes", which requires income taxes to be recorded using the
         liability  method.  Under  the  liability  method,  deferred  taxes are
         provided for temporary  differences between the financial reporting and
         income tax bases of assets and liabilities,  applying presently enacted
         tax rates and laws.  Taxes  have been paid by PSI and PSMI on behalf of
         PSBP, and are included in due from affiliate.

                  During 1997, PSBP 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,  PSBP is not taxed on that
         portion of its taxable income which is distributed to its  shareholders
         provided that PSBP meets certain tests.  PSBP believes it has met these
         tests during 1997; accordingly,  no provision for income taxes has been
         made in the accompanying financial statements.  In addition, PSP11 (the
         legal entity for income tax reporting purposes  subsequent to the March
         17, 1998 merger) believes it has also met the REIT tests during each of
         1997, 1996 and 1995.

                                       10
<PAGE>


                  The  income  tax  provision  for  fiscal  1996  and 1995 is as
         follows:

                             1996:
                               Federal                 $      166,000
                               State                           50,000
                                                      ----------------------
                                                       $      216,000
                                                      ======================

                             1995:
                               Federal                 $      372,000
                               State                          100,000
                                                      ----------------------
                                                       $      472,000
                                                      ======================

                  The income tax provision is different from that which would be
         computed by applying the Federal income tax rate to income before taxes
         as follows:

                                                    1996               1995
                                             -----------------  ----------------

            Tax at statutory rate              $    177,000       $    405,000
            State income taxes                       33,000             66,000
            Other                                     6,000              1,000
                                             -----------------  ----------------
                                               $    216,000       $    472,000
                                             =================  ================

         Use of estimates:

                  The  preparation  of financial  statements in conformity  with
         generally accepted  accounting  principles  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.

         General and administrative expense:

                  General and  administrative  expense  includes  legal expense,
         office  expense,  state income  taxes (in the case of 1997),  executive
         salaries,  and other such  administrative  items.  Such amounts include
         amounts  incurred  by PSI on behalf of PSBP,  which  were  subsequently
         charged to PSBP.

3.       REAL ESTATE FACILITIES

                  On January  2,  1997,  concurrent  with the  formation  of the
         Operating  Partnership,  PSI and  affiliated  entities  contributed  26
         commercial  properties  (approximately  2.4 million square feet) to the
         Operating  Partnership in exchange for 5,824,383 OP Units. In addition,
         PSI  contributed  9  commercial  properties  to  PSBP in  exchange  for
         1,198,680   shares  of   non-voting   participating   preferred.   PSBP
         immediately  contributed these 9 commercial  properties  (approximately
         0.6 million square feet) to the Operating  Partnership for 1,198,680 OP
         Units.   These  transactions  were  accounted  for  as  a  purchase  of
         properties  by  PSBP  and  the  Operating  Partnership  at  fair  value
         (approximately $117.2 million in aggregate).

                  In  April  1997,  PSI  contributed  4  commercial   properties
         (approximately 0.4 million square feet) to the Operating Partnership in
         exchange  for  1,480,968  OP Units.  The cost of these  properties  was
         recorded at PSI's carrying cost of approximately $23.9 million.

                                       11
<PAGE>

                  In separate  transactions  in July,  September,  and  December
         1997,  PSBP  and the  Operating  Partnership  acquired  a total of four
         commercial  properties  (approximately  0.6 million  square  feet) from
         unaffiliated  third  parties.  The  aggregate  purchase  cost of  these
         facilities was approximately $47.5 million,  consisting of the issuance
         of 27,495 OP Units  having a value of  approximately  $0.6  million and
         $46.9 million in cash.

                  In  addition,  on December 24,  1997,  PSBP and the  Operating
         Partnership  issued 3,504,758 shares of PSBP common stock and 1,785,007
         OP Units,  respectively,  to  subsidiaries of a state pension plan, and
         the  subsidiaries,  through a merger and  contribution,  transferred to
         PSBP and the Operating Partnership a total of six commercial properties
         (approximately  2.0 million net rentable  square feet) and $1.0 million
         in cash. The total cost of the six properties was approximately  $118.9
         million.

                  The activity in real estate facilities in 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
        Capital improvements (Jan - Mar 1997)                     -            582,000                 -            582,000
        Depreciation expense (Jan - Mar 1997)                     -                  -          (820,000)          (820,000)
        Adjustment to reflect PSI's acquisition
          cost (Note 2)                                           -          7,146,000           820,000          7,966,000
                                                    ------------------  ---------------   ----------------   -----------------

        Balances at March 31, 1997                       35,154,000         89,754,000                 -        124,908,000
        Acquisitions from:
             PSI and affiliates                           6,682,000         17,294,000                 -         23,976,000
             Third parties                               49,918,000        116,435,000                 -        166,353,000
        Capital improvements (Apr - Dec 1997)                     -          2,983,000                 -          2,983,000
        Depreciation expense (Apr - Dec 1997)                     -                  -        (3,982,000)        (3,982,000)
                                                    ------------------  ---------------   ----------------   -----------------
        Balances at December 31, 1997                   $91,754,000       $226,466,000       $(3,982,000)      $314,238,000
                                                    ==================  ===============   ================   =================
</TABLE>

4.        LEASING ACTIVITY

                  Future minimum rental revenues under non-cancelable  leases as
         of December 31, 1997 with tenants for the above real estate  facilities
         are as follows:

                            1998                           $   42,937,000
                            1999                               30,527,000
                            2000                               19,785,000
                            2001                               11,005,000
                            2002                                6,141,000
                            Thereafter                          8,662,000
                                                         -------------------
                                                           $  119,057,000
                                                         ===================

                                       12
<PAGE>


5.       MINORITY INTERESTS

                  In consolidation,  PSBP classifies  ownership interests in the
         Operating Partnership,  other than its own, as minority interest on the
         consolidated financial statements. Minority interest in income consists
         of the  minority  interests'  share  (approximately  69% on a  weighted
         average basis of income before  minority  interest and income taxes for
         the two periods  comprising  the year ended  December  31, 1997) of the
         consolidated operating results.

                  Subject to certain  limitations  described below, each limited
         partner other than PSBP has the right to require the redemption of such
         limited  partner's  partnership  interests  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 PSBP, 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  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, PSBP, 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 PSBP  common  stock for each unit of  limited
         partnership interest redeemed.

                  A limited  partner  cannot  exercise its  redemption  right if
         delivery of shares of PSBP 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, 1997,  there were  9,117,854 OP Units owned by
         minority  interests   (7,305,352  were  owned  by  PSI  and  affiliated
         entities, 1,785,007 were owned by a subsidiary of a state pension fund,
         and  27,495  were  owned by  unaffiliated  third  parties).  On a fully
         converted  basis,  assuming all 9,117,854 OP Units were  converted into
         shares of common  stock of PSBP at  December  31,  1997,  the  minority
         interests  would own  approximately  54% of the pro forma common shares
         outstanding.

                  In January  1998,  the  subsidiary  of the state  pension plan
         exercised  its  option to convert  its OP Units  into  shares of common
         stock of PSBP.

6.       PROPERTY MANAGEMENT CONTRACTS

                  The  Operating  Partnership  manages  industrial,  office  and
         retail  facilities for PSI and entities  affiliated with PSI, and third
         party  owners.  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.

                                       13
<PAGE>

                  The property  management  contract  with PSI is for seven year
         terms  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.

7.       SHAREHOLDERS' EQUITY

                  PSBP was  initially  capitalized  with 2,500 shares of capital
         stock. In connection with the November 16, 1995 merger between PSMI and
         PSI, PSBP's Articles of Incorporation were amended  authorizing PSBP to
         issue only two classes of shares (i) 100,000  shares of $0.10 par value
         preferred  stock and (ii)  100,000  shares  of $0.10  par value  common
         stock.  PSBP's existing 2,500 shares of capital stock were,  concurrent
         with the amendment, exchanged for 899,608 shares of preferred stock.

                  The preferred  stock  participates  fully on a share for share
         basis in any  dividends  which the Board of Directors of PSBP  declares
         with respect to the common shares. Except under certain conditions, the
         preferred stock has no voting rights on any matter  requiring a vote of
         shareholders.  In the event of any liquidation,  dissolution or winding
         up of PSBP,  the  preferred  stock shall be  entitled  to  receive,  in
         preference  to any  payment on the common  shares,  an amount  equal to
         $16.69 per  share.  After this the  common  shares  receive  $16.69 per
         share.  Subsequent to the common shares receiving $16.69 per share, the
         remainder  is  distributed  ratably  among  the  preferred  and  common
         shareholders.

                  In  connection  with the  November  16,  1995  merger,  Hughes
         purchased  47,348  shares  of  common  stock of PSBP for cash  totaling
         $790,000.

                  In December 1996, PSBP issued 47,349 shares of common stock to
         third  parties for cash  totaling  $790,000.  In addition,  in December
         1996,  Ronald L. Havner,  Jr. acquired all of the common shares of PSBP
         held by B. Wayne Hughes.

                  In July 1997,  PSBP issued  2,025,769  shares of common  stock
         primarily to PSI for cash totaling $33,800,000.

                  In December 1997, PSBP issued 3,504,758 shares of common stock
         to a  subsidiary  of a  state  pension  plan  in  connection  with  the
         acquisition  of  commercial  properties.  PSBP  incurred  approximately
         $3,300,000 in transaction costs.

                  As a REIT,  PSBP must  distribute to its  shareholders in each
         taxable  year an  amount  at least  equal  to 95% of its  REIT  taxable
         income.  In November and December 1997, PSBP paid  distributions to its
         common shareholders totaling $2.1 million ($0.494 per common share) and
         $1.5   million   ($0.189   per   common   share),   respectively.   The
         characterization  of dividends for Federal  income tax purposes is made
         based upon  earnings  and profits of PSBP,  as defined by the  Internal
         Revenue Code.  Distributions declared by the Board of Directors in 1997
         were characterized as ordinary income.

8.       STOCK OPTIONS

                  PSBP has a 1997  Stock  Option  Plan (the  "Plan").  Under the
         Plan,  PSBP has  granted  non-qualified  options to certain  directors,
         officers and key employees to purchase shares of PSBP's common stock at
         a price equal to 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.

                                       14
<PAGE>


                  At December 31, 1997, there were 1,500,000 options  authorized
         to  grant.  Information  with  respect  to the Plan  during  1997 is as
         follows:


                                                               1997
                                                 -------------------------------
                                                    Number of      Average Price
                                                     Options         per Share
                                                 --------------  ---------------
 Options outstanding January 1                             -        $   -
   Granted                                           305,570           16.80
   Exercised                                               -            -
   Canceled                                                -            -
                                                 --------------  ---------------
 Options outstanding December 31                     305,570        $  16.80
                                                                 ===============

 Option price range at December 31                                      $16.69
                                                                     to $22.88

 Options exercisable at December 31                     None
                                                 ==============
 Options available for grant at December 31        1,194,430
                                                 ==============

                  PSBP adopted the disclosure  requirement provision of SFAS No.
         123 in accounting for stock-based  compensation issued to employees. As
         of December 31, 1997 there were 305,570 options  outstanding  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  either of the two  periods
         comprising the year ended December 31, 1997. The remaining  contractual
         lives were 9.1 years at December 31, 1997.

9.       SUBSEQUENT EVENTS

         Property acquisitions:

                  On January 13, 1998, PSBP purchased a commercial  property for
         approximately  $22,643,000,  consisting  of  $22,450,000  cash  and the
         issuance of 8,428 OP Units having a value of approximately $193,000.

                  In March 1998,  PSBP purchased two commercial  properties from
         unaffiliated  third  parties  for an  aggregate  cost of  approximately
         $33,139,000,  composed of  $17,600,000  cash, the issuance of 44,250 OP
         units having a value of approximately $1,013,000, and the assumption of
         mortgage notes payable of $14,526,000.

         Stock issuances to institutional investors:

                  In January 1998,  PSBP entered into an agreement  with a group
         of institutional  investors under which PSBP will issue up to 6,744,074
         shares of PSBP common  stock at $22.88 per share in cash (an  aggregate
         of up to  $155,000,000)  in  separate  traunches.  The  first  tranche,
         2,185,189  shares or $50.0  million,  was issued in January  1998.  The
         remainder  of the shares  will be issued as the funds are  required  by
         PSBP to purchase commercial properties.

                                       15
<PAGE>


         Line of credit with PSI:

                  PSBP has entered into a line of credit  agreement with PSI for
         $100,000,000 with an interest rate of the London Interbank Offered Rate
         ("LIBOR") plus 1.25%.

         March 17, 1998 merger (unaudited):

                  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, each share of AOPP's common stock was
         converted into 1.18 shares of PSP11 common stock.  PSP11, the surviving
         corporation,  was renamed "PS Business Parks, Inc." (PSBP as defined in
         Note 1). Under the merger transaction:

              * Each  outstanding  share of PSP11 Common  Stock  continues to be
              owned by current  holders or  converted  into the right to receive
              $20.50 in cash.  The total  amount  of  shares  electing  cash was
              106,155.  If a PSP11  shareholder  did not elect  cash,  he or she
              continues to own PSP11 Common Stock.

              * Each  share of PSP11  Common  Stock  Series B and each  share of
              PSP11 Common  Stock  Series C converted  into .8641 share of PSP11
              Common Stock.

              * Each share of AOPP Common  Stock  converted  into 1.18 shares of
              PSP11 Common Stock.

              * 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
              the real estate  facilities owned by PSP11 was  approximately  $48
              million.

                  Pro forma data  (unaudited)  for the year ended  December  31,
         1997 as though the merger,  property acquisitions which occurred during
         fiscal 1997 and during 1998 (as described above), had been effective at
         the beginning of fiscal 1997 is as follows:

                                                            (in thousands except
                                                               per share data)
                                                           ---------------------
     Pro forma:
     ----------

     Revenues.............................................      $     68,625
     Net income...........................................            18,918

     Net income per common share (Basic)..................      $      1.35
     Net income per common share (Diluted)................             1.35

     Weighted average shares outstanding (Basic)..........            13,982
     Weighted average shares outstanding (Diluted)........            14,021

     Total assets.........................................      $    427,872
     Notes payable........................................      $     14,526
     Shareholders equity..................................      $    266,952

                                       16
<PAGE>

                  The pro forma data does not purport to be indicative either of
         results of  operations  that would have  occurred had the  transactions
         occurred  at  the  beginning  of  fiscal  1997  or  future  results  of
         operations PSBP and the Operating Partnership.

10.      RECENT ACCOUNTING PRONOUNCEMENTS

                  In June  1997,  the  FASB  issued  SFAS  No.  130,  "Reporting
         Comprehensive Income" ("SFAS 130"), which establishes standards for the
         reporting of  comprehensive  income and its components.  This statement
         requires a separate statement to report the components of comprehensive
         income for each period  reported.  The provisions of this statement are
         effective for fiscal years beginning after December 15, 1997. PSBP will
         implement  SFAS 130 for the fiscal year ended  December 31,  1998,  but
         PSBP does not expect the impact to be material.

                  In July 1997, the FASB issued SFAS No. 131, "Disclosures about
         Segments of an Enterprise and Related  Information" ("SFAS 131"), which
         establishes  standards  for the way that  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
         issued  to  shareholders.  This  statement  is  effective  for  periods
         beginning  after  December 15,  1997.  PSBP does not expect SFAS 131 to
         have a significant impact upon its reporting presentation.


                                       17
<PAGE>


Item 7(a)(ii)     MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                  AND RESULTS OF OPERATIONS

         The  following  discussion  should  be read  in  conjunction  with  the
Consolidated  Financial Statements of PS Business Parks, Inc. ("PSBP") and notes
thereto included as Item 7 (a)(i) of this Form 8-K/A.

         DESCRIPTION OF BUSINESS

         The  financial  statements of PSBP include the accounts of PSBP and its
Operating  Partnership  (as defined later) which was formed in 1997. PSBP is the
general partner of the Operating Partnership.

         PSBP is the successor to American Office Park Properties, Inc. ("AOPP")
and the survivor in the merger of AOPP into Public  Storage  Properties XI, Inc.
("PSP11") on March 17, 1998.  Based upon the terms of the merger,  for financial
reporting and accounting purposes, the merger will be 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 PSBP prior to March 17, 1998, refer to AOPP.

         PSBP was organized in California in 1986 as a  wholly-owned  subsidiary
of Public Storage  Management,  Inc.  ("PSMI"),  a privately owned company of B.
Wayne Hughes and his family (collectively "Hughes").

         On November 16, 1995,  Public Storage,  Inc. ("PSI") acquired PSMI in a
business combination accounted for using the purchase method. In connection with
the  transaction,  PSI  exchanged  its  common  stock for all of the  non-voting
participating preferred stock of PSBP, representing a 95% economic interest, and
Hughes purchased all the voting common stock of PSBP, representing the remaining
5% economic  interest.  During  December  1996,  Ronald L. Havner,  Jr. (then an
executive officer of PSI) acquired all of Hughes' common stock in PSBP.

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

         On March 31, 1997, PSI exchanged its non-voting participating preferred
stock  into  common  shares of PSBP.  As a result of the  exchange,  PSI owned a
majority of the voting common stock and  effectively  gained  control of PSBP at
that time.

         From 1986 through 1996,  PSBP's sole business  activities  consisted of
the property  management of commercial  properties  owned by PSI and  affiliated
entities.  Commencing  in  1997,  PSBP  began  to  own  and  operate  commercial
properties  for its own behalf.  At December  31, 1997,  PSBP and the  Operating
Partnership   collectively   owned  and   operated  49   commercial   properties
(approximately  6.0 million net rentable  square feet) located in 10 states.  In
addition,  on December 31, 1997, the Operating  Partnership managed on behalf of
PSI and affiliated entities 49 additional commercial  properties  (approximately
1.9 million net rentable square feet).

         RESULTS OF OPERATIONS

         YEAR ENDED  DECEMBER 31, 1997  COMPARED TO THE YEAR ENDED  DECEMBER 31,
1996: On March 31, 1997, PSI exchanged its non-voting preferred stock for voting
common  stock of PSBP in a  transaction  accounted  for as a purchase of PSBP by
PSI. As a result of PSI attaining a 95% ownership interest in PSBP voting common
stock,  the financial  results for 1997 are presented  separately for the period
prior to the exchange  transaction  for the period  January 1, 1997 to March 31,
1997 and subsequent to the exchange  transaction for the period April 1, 1997 to
December 31, 1997.

                                       18
<PAGE>


         To properly  compare the operating  results for the year ended December
31, 1997 to the same  period in the prior  year,  the amounts for 1997 have been
combined as follows:

<TABLE>
<CAPTION>

                                                January 1, 1997 -           April 1, 1997 -              Year ended
                                                 March 31, 1997           December 31, 1997         December 31, 1997
                                               -------------------        -----------------         -------------------
Revenues:
   <S>                                            <C>                        <C>                       <C>          
   Rental income                                  $   5,805,000              $  24,364,000             $  30,169,000
   Facility management fees                             247,000                    709,000                   956,000
   Interest and other income                             29,000                    424,000                   453,000
                                               -------------------        -----------------         -------------------
                                                      6,081,000                 25,497,000                31,578,000
                                               -------------------        -----------------         -------------------
Expenses:
   Cost of operations                                 2,493,000                  9,837,000                12,330,000
   Cost of facility management                           60,000                    129,000                   189,000
   Depreciation and amortization                        820,000                  4,375,000                 5,195,000
   General and administrative                           213,000                  1,248,000                 1,461,000
   Interest expense                                           -                      1,000                     1,000
                                               -------------------        -----------------         -------------------
                                                      3,586,000                 15,590,000                19,176,000
                                               -------------------        -----------------         -------------------
Net income before minority
   interest                                           2,495,000                  9,907,000                12,402,000
Minority interest                                    (1,813,000)                (6,753,000)               (8,566,000)
                                               -------------------        -----------------         -------------------
   Net income                                     $     682,000              $   3,154,000             $   3,836,000
                                               ===================        =================         ===================

</TABLE>

         Net income for the year ended December 31, 1997 was $3,836,000 compared
to $303,000 for the year ended  December 31, 1996,  representing  an increase of
$3,533,000.  This  significant  increase in net income reflects PSBP's change in
business  focus  from  being  solely a manager of  commercial  properties  to an
owner/operator as well as the continued management of commercial  properties for
a fee. As indicated above,  prior to 1997, PSBP owned no commercial  properties.
Throughout fiscal 1997, PSBP acquired a total of 49 commercial  facilities which
in the aggregate  contributed  property net operating income (rental income less
cost of operations and  depreciation  expense) of  $13,037,000  during 1997. The
operating results reflects the aggregate operations of these facilities from the
date each  property  was acquired  through the end of 1997 and is therefore  not
representative of the operations of the facilities for the entire fiscal year.

                  During the year  ended  December  31,  1997,  $767,000  in net
operating income was recognized from facility management  operations compared to
$1,619,000  during  the  same  period  in 1996.  During  1996,  PSBP's  property
management  operations  generated net operating income of $1,619,000 through the
management of a total of 88 commercial properties.  In 1997, PSBP acquired 39 of
these 88  commercial  properties  and,  as a  result,  PSBP no  longer  receives
property   management  fees  on  these  properties   after  their   acquisition.
Accordingly,  PSBP's facility management  operations decreased  significantly in
1997 as compared to 1996, generating net operating income of $767,000 in 1997.

         During the year ended  December  31, 1997,  general and  administrative
expenses were  $1,461,000  compared to $1,143,000 for the same period in 1996, a
$318,000 increase. The increase in general and administrative expenses is due to
an  increase  in  salaries  and  other  expenses  related  to the  January  1997
reorganization and subsequent increased level of activities.

         Depreciation and amortization expense was $5,195,000 for the year ended
December 31, 1997. No amounts for  depreciation  and  amortization  expense were
reported  for the same period in 1996,  as PSBP owned no real estate  facilities
and did not have intangible assets.

         Minority  interest in income  represents the income allocable to equity
interests in the Operating Partnership which are not owned by PSBP. During 1997,
$8,566,000 of income was allocated to the minority interest,  representing their
pro rata share of income in the consolidated entities.

                                       19
<PAGE>

         YEAR ENDED  DECEMBER 31, 1996  COMPARED TO THE YEAR ENDED  DECEMBER 31,
1995. Net income for the year ended  December 31, 1996 was $303,000  compared to
net income for the year ended December 31, 1995 of $720,000.  The primary reason
for  this  decline  in net  income  was an  $824,000  increase  in  general  and
administrative  expense.  Net operating  income  related to facility  management
operations  for the year ended December 31, 1996 was  $1,619,000,  a $145,000 or
9.8% increase from $1,474,000 reported for the year ended December 31, 1995. The
increase is due to a 4.4% increase in facility  management  fees earned combined
with a 9.8%  decrease  in cost of  managing  the  facilities.  The  increase  in
facility  management fees is due to higher  revenues at the facilities  managed.
During 1996,  revenues of the properties  managed were $42.6 million compared to
$40.7 million for 1995 due to a 0.9% increase in occupancy levels (from 94.7% in
1995 to 95.6% in 1996) and a 3.5% increase in realized annual rental rates (from
$8.37  in 1995 to  $8.66  in  1996).  The  reduction  in  cost of  managing  the
facilities  is due mainly to a $47,000  decrease  in  salaries  related to field
management personnel.

         General and administrative  expense for 1996 was $1,143,000 compared to
$319,000 in 1995. This increase of $824,000  includes legal expense of $456,000.
This includes  approximately  $407,000 of non-recurring legal expense related to
corporate planning issues. In addition,  general and administrative  expense for
1996 includes  $533,000 in salaries  related to direct and allocated  costs from
PSI  for  management  and  support  functions,  including  but  not  limited  to
accounting,  data processing and legal. In 1995, many of these support functions
were being provided by PSBP's parent.

         LIQUIDITY AND CAPITAL RESOURCES

         PSBP is  characterized by low leverage and an increasing level of funds
available  for  distributions  and  investments.  Net cash provided by operating
activities  for  the  years  ended  December  31,  1997,   1996  and  1995  were
$19,437,000, $413,000 and $950,000, respectively.  Management expects cash flows
from   operations   will  be  sufficient  to  fund  capital   expenditures   and
distributions  in the future.  As of December 31, 1997,  PSBP had  $3,500,000 in
notes payable outstanding. These notes were paid in full in January 1998.

         In addition to cash flow from operations,  PSBP has entered into a line
of  credit  agreement  with  PSI for  $100,000,000  which is  available  to fund
operations and future acquisitions.  The line of credit bears interest at a rate
of the London Interbank Offered Rate ("LIBOR") plus 1.25%. PSBP has also entered
into an agreement  with  institutional  investors  whereby PSBP will issue up to
6,744,074 shares of its common stock for cash  ($155,000,000).  The cash will be
available  for PSBP to use for  acquisition  purposes.  (See  Subsequent  Events
below)

         The  following  table   summarizes   PSBP'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 PSBP to pay
distributions to shareholders and acquire property interests.


<TABLE>
<CAPTION>
`                                               Year ended December 31, 1997                 Years ended December 31,
                                   -------------------------------------------------------   --------------------------
                                    January 1, 1997     April 1, 1997
                                        through            through          Year ended
                                     March 31, 1997   December 31, 1997  December 31, 1997     1996           1995
                                   ----------------- ------------------  -----------------   ------------  ------------

<S>                                    <C>               <C>                <C>               <C>            <C>     
Net income                             $  682,000        $3,154,000         $3,836,000        $303,000       $720,000
Depreciation and amortization             820,000         4,375,000          5,195,000              -              -
Change in working capital               2,525,000          (685,000)         1,840,000        110,000        230,000
Minority interest in income             1,813,000         6,753,000          8,566,000              -              -
                                   ----------------- ------------------  -----------------   ------------  ------------

Net cash provided by operating          5,840,000        13,597,000         19,437,000        413,000        950,000
  activities
Capital improvements to maintain
  facilities                             (582,000)       (2,983,000)        (3,565,000)             -              -
                                   ----------------- ------------------  -----------------   ------------  ------------

Funds available for distributions
  to shareholders and
  acquisitions and other                5,258,000        10,614,000         15,872,000        413,000        950,000
  corporate purposes
Cash distributions to
  shareholders and minority interests           -        (6,992,000)        (6,992,000)      (400,000)      (815,000)
                                   ----------------- ------------------  -----------------   ------------  -----------

Excess funds available for
  acquisitions and other corporate     
  purposes                             $5,258,000        $3,622,000         $8,880,000        $13,000        $135,000
                                   ================= ==================  =================   ============  ===========
</TABLE>

                                       20
<PAGE>

         Funds from  operations  (FFO) is defined by PSBP as net income  (loss),
computed in accordance with generally  accepted  accounting  principles  (GAAP),
before depreciation,  amortization and extraordinary or non-recurring items. FFO
is presented  because PSBP 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 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
PSBP may not be  comparable  to FFO  computed  and  disclosed  by  other  REITs.

         Funds from operations for PSBP is computed as follows:

<TABLE>
<CAPTION>

                                              Year ended December 31, 1997                  Years Ended December 31,
                                   -------------------------------------------------------   --------------------------            
                                    January 1, 1997    April 1, 1997
                                        through           through          Year ended
                                     March 31, 1997  December 31, 1997  December 31, 1997      1996           1995
                                   ----------------- ------------------ ------------------   ------------  ------------
<S>                                   <C>              <C>               <C>                  <C>             <C>     
Net income                            $ 682,000        $ 3,154,000       $ 3,836,000          $ 303,000       $720,000
Minority interest in income           1,813,000          6,753,000         8,566,000                  -              -
Depreciation and amortization           820,000          4,375,000         5,195,000                  -              -  
                                   ----------------- ------------------ ------------------   ------------  ------------
   Subtotal                           3,315,000         14,282,000        17,597,000            303,000        720,000
FFO allocated to minority            
interests                            (2,408,000)        (9,735,000)      (12,143,000)                 -            -
                                   ----------------- ------------------ ------------------   ------------  ------------
Funds from operations
  allocated to shareholders          $  907,000        $ 4,547,000       $ 5,454,000          $ 303,000       $720,000
                                   ================= ================== ==================   ============  ============
</TABLE>


         Distributions.  PSBP has  elected  and intends to qualify as a REIT for
federal  income tax  purposes.  As a REIT,  PSBP must meet,  among other  tests,
sources of income, share ownership and certain asset tests. In addition, PSBP is
not taxed on that  portion of its taxable  income  which is  distributed  to its
shareholders  provided that at least 95% of its taxable income is so distributed
to its shareholders prior to filing of its tax return.  PSBP intends to meet its
distribution  requirement by distributing  the minimum amount required under the
distribution test.

         SUBSEQUENT EVENTS

         PROPERTY ACQUISITIONS. On January 13, 1998, PSBP purchased a commercial
property for approximately  $22,643,000,  consisting of $22,450,000 cash and the
issuance of 8,428 OP Units having a value of approximately $193,000.

         In  March  1998,   PSBP  purchased  two  commercial   properties   from
unaffiliated  third parties for an aggregate cost of approximately  $33,139,000,
composed of $17,600,000  cash, the issuance of 44,250 OP units having a value of
approximately  $1,013,000,  and the  assumption  of  mortgage  notes  payable of
$14,526,000.

         STOCK  ISSUANCES TO  INSTITUTIONAL  INVESTORS.  In January  1998,  PSBP
entered into an agreement with a group of  institutional  investors  under which
PSBP will issue up to 6,744,074  shares of PSBP common stock at $22.88 per share
in cash (an aggregate of up to  $155,000,000) in separate  traunches.  The first
traunch,  2,185,189 or $50.0 million,  was issued in January 1998. The remainder
of the  shares  will be issued as the funds  are  required  by PSBP to  purchase
commercial properties.

                                       21


<PAGE>



Item 7 (b)        PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)


The  following  unaudited  pro  forma  consolidated  financial  statements  were
prepared to reflect the March 17, 1998 merger (the "Merger") of American  Office
Park Properties, Inc. ("AOPP") and Public Storage Properties XI, Inc. ("PSP11"),
which is described in the Public Storage Properties XI, Inc. Proxy Statement and
Prospectus  dated  February  5, 1998 (the  "Proxy  Statement").  Pursuant to the
Merger:

              *AOPP merged into PSP11.

              *Each  outstanding share of PSP11 Common Stock, with the exception
              of 106,155  shares  which  elected  to receive  $20.50 in cash per
              share, continues to be owned by current holders.

              *Each share of PSP11 Common Stock Series B and each share of PSP11
              Common Stock  Series C converted  into .8641 share of PSP11 Common
              Stock.

              *Each share of AOPP  Common  Stock  converted  into 1.18 shares of
              PSP11 Common Stock.

              *The surviving  corporation in the Merger was renamed "PS Business
              Parks, Inc. ("PSBP")."

              *Concurrent  with the Merger,  PSP11 exchanged (the "Exchange") 11
              mini-warehouses and two properties that combine mini-warehouse and
              commercial  space  for 11  commercial  properties  owned by Public
              Storage, Inc. ("PSI").

The Merger will be accounted for as a reverse  merger whereby AOPP is treated as
the accounting  acquirer  using the purchase  method.  This has been  determined
based upon the following:

              *The former  shareholders and unitholders of AOPP own in excess of
              80% of the merged companies.

              *The business focus post Merger will continue to be that of AOPP'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 represent  approximately 81% of its
              portfolio.

In addition to adjustments  to reflect the Merger,  pro forma  adjustments  were
made to reflect the following  transactions  (all share and OP Unit amounts have
been adjusted to reflect the conversion factor of 1.18 pursuant to the Merger):

            1. On April 1, 1997, AOPP LP (the "Operating  Partnership") acquired
               four commercial  properties from PSI in exchange for 1,480,968 OP
               Units.

            2. On July 31, 1997, AOPP acquired two commercial properties from an
               unaffiliated  third  party for cash  totaling  $33,750,000.  AOPP
               raised the cash for this acquisition by issuing  2,025,769 shares
               of  AOPP  Common  Stock   primarily  to  PSI  for  cash  totaling
               $33,800,000.

            3. On September 24, 1997, AOPP acquired one commercial property (the
               "Largo  Property")  from  an  unaffiliated  third  party  for  an
               aggregate cost of $10,374,000,  consisting of cash of $10,050,000
               and the  issuance  of 14,384  Operating  Partnership  units  ("OP
               Units") having a value of $324,000.

            4. On December 10, 1997,  AOPP purchased a commercial  property (the
               "Northpointe  Property")  for  $3,875,000,  consisting of cash of
               $3,575,000  and the issuance of 13,111 OP Units having a value of
               $300,000.

                                       22
<PAGE>

            5. On December 24, 1997,  AOPP  completed a  transaction  where AOPP
               issued  1,785,007  OP Units and  3,504,758  shares of AOPP common
               stock to a subsidiary of a state pension fund, and the subsidiary
               of the state  pension  fund,  through a merger and  contribution,
               transferred to AOPP six  commercial  properties  (the  "Acquiport
               Properties" -  $118,655,000)  and  $1,000,000  cash.  The Company
               incurred $3,300,000 in transaction costs. On January 9, 1998, the
               subsidiary  of the state  pension  fund  exercised  its option to
               convert  its OP  Units  into  shares  of AOPP  common  stock on a
               one-for-one basis.

            6. In January 1998, AOPP entered into an agreement in principle with
               a group of  institutional  investors under which AOPP would issue
               up to  6,744,074  shares of AOPP common stock at $22.88 per share
               in separate  tranches.  The first  tranche,  2,185,189  shares or
               $50.0  million,  was issued in January 1998. The remainder of the
               shares  are to be issued as the funds are  required  by AOPP,  in
               minimum increments of $20.0 million.

            7. On January 13, 1998,  AOPP  purchased a commercial  property (the
               "Ammendale  Property")  for  $22,643,000,  consisting  of cash of
               $22,450,000  and the issuance of 8,428 OP Units having a value of
               $193,000.

            8. In March 1998,  AOPP  purchased two  commercial  properties  (the
               "March  Acquisitions",  referred to in the Proxy  Statement dated
               February 5, 1998 as the "Proposed  Acquisition  Properties") from
               unaffiliated  third parties for an aggregate cost of $33,139,000,
               composed of  $17,600,000  cash,  the  issuance of 44,250 OP Units
               having a value of  $1,013,000,  and the  assumption  of  mortgage
               notes payable of $14,526,000.

The pro forma consolidated  balance sheet at December 31, 1997 has been prepared
to reflect (i) the  aforementioned  acquisitions  and proposed  acquisitions  of
commercial  properties  which occurred after December 31, 1997, (ii) the related
conversion  of OP units to AOPP  Common  Stock by the  subsidiary  of the  state
pension  fund,  (iii) the  issuance  of $50.0  million of AOPP  Common  Stock to
institutional investors, and (iv) the Merger transaction between AOPP and PSP11.

The pro forma  consolidated  statement of income for the year ended December 31,
1997 has been prepared assuming (i) the aforementioned acquisitions and proposed
acquisitions of commercial properties (ii) the issuance of $50.0 million of AOPP
Common Stock to institutional  investors,  and (iii) the Merger between AOPP and
PSP11,  as if all such  transactions  were  completed at the beginning of fiscal
1997.

The pro forma adjustments are based upon available  information and upon certain
assumptions  as set forth in the notes to the pro forma  consolidated  financial
statements that PSP11 and AOPP believe are reasonable in the circumstances.  The
pro forma  consolidated  financial  statements and accompanying  notes should be
read in conjunction with the historical financial statements of PSP11, AOPP, and
certain financial  information with respect to properties  acquired and proposed
to be acquired pursuant to agreements in principle.  (SEE "FINANCIAL  STATEMENTS
- -ACQUIRED  PROPERTIES,  -PSI EXCHANGE  PROPERTIES,  -BALDON  PROPERTIES,  -LARGO
PROPERTY, -ACQUIPORT PROPERTIES, -PROPOSED ACQUISITION PROPERTIES,  -NORTHPOINTE
PROPERTY,  AND  -AMMENDALE  PROPERTY  INCLUDED  IN THE  ABOVE  REFERENCED  PROXY
STATEMENT).  The following pro forma  consolidated  financial  statements do not
purport to represent what AOPP's results of operations  would actually have been
if the  transactions  in fact had occurred at the beginning of fiscal 1997 or to
project AOPP's results of operations for any future date or period.

                                       23

<PAGE>

                             PS BUSINESS PARKS, INC.
                      PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)
             (Amounts in thousands, except share and per share data)

<TABLE>
<CAPTION>

                                                                                   AOPP
                                                     ---------------------------------------------------------------                
                                                                          Pro Forma Adjustments                                     
                                                                    --------------------------------                                
                                                                        Property          Other            AOPP                     
                       ASSETS                             AOPP        Acquisitions     Adjustments      Pre-Merger        PSP11     
                                                      (Historical)      (Note 1)         (Note 2)       (Pro Forma)    (Historical) 
                                                      ------------   --------------   -------------   -------------    ------------ 
<S>                                                   <C>            <C>              <C>             <C>              <C>          
Cash and cash equivalents                             $     3,884    $      (40,050)  $      41,200   $       5,034    $     2,455  
Real estate facilities, net of accumulated                314,238            55,782               -         370,020         25,937  
   depreciation
Intangible assets, net of accumulated amortization          3,272                 -               -           3,272              -  
Other assets                                                2,060                 -               -           2,060            454  
Purchase cost                                                   -                 -               -               -              -  
                                                      ------------   --------------   -------------   -------------    ------------ 
     Total assets                                     $   323,454    $       15,732   $      41,200   $     380,386    $    28,846  
                                                      ============   ==============   =============   =============    ============ 

        LIABILITIES AND SHAREHOLDERS' EQUITY

Accrued and other liabilities                         $     8,331    $            -   $      (2,900)  $       5,431    $     1,475  
Notes payable                                               3,500            14,526          (3,500)         14,526              -  
Minority interest                                         168,665             1,206         (30,383)        139,488              -  
Shareholder's equity:
   Common stock , $.10 par value, 100,000,000 
    shares authorized 7,728,000 issued and 
    outstanding (13,981,938 pro forma shares
    issued and outstanding)                                 773                               398           1,171              -    
   Series A                                                     -                 -               -               -             18  
   Series B                                                     -                 -               -               -              2  
   Series C                                                     -                 -               -               -              5  
   Paid-in capital                                        142,581                            77,585         220,166         32,421  
   Cumulative net income                                    3,154                 -               -           3,154         29,451  
   Cumulative distribution paid                            (3,550)                -               -          (3,550)       (34,526) 
                                                      ------------   --------------   -------------   -------------    ------------ 
       Total shareholders' equity                         142,958                 -          77,983         220,941         27,371  
                                                      ------------   --------------   -------------   -------------    ------------ 
   Total liabilities and shareholders' equity         $   323,454    $       15,732   $      41,200   $     380,386    $    28,846  
                                                      ============   ==============   =============   =============    ============ 

Book value per share of common stock (Note 4)         $     18.50                                     $       18.89    $     10.83  
                                                      ============                                    =============    ============ 

Shares outstanding                                      7,728,309                                        11,698,505      2,527,008 
                                                      ============                                    =============    ============ 
</TABLE>

<TABLE>
<CAPTION>

                                                     
                                                            Pro Forma Merger
                                                             Adjustments
                                                     ----------------------------
                                                                                       PSBP
                       ASSETS                           Purchase     Valuation     Post-Merger
                                                        (Note 3)      (Note 3)     (Pro Forma)
                                                      ------------  ------------  ------------- 
<S>                                                   <C>           <C>           <C>          
Cash and cash equivalents                             $    (2,976)  $         -   $       4,513
Real estate facilities, net of accumulated                      -        23,156         419,113
   depreciation
Intangible assets, net of accumulated amortization              -        (1,540)          1,732
Other assets                                                    -             -           2,514
Purchase cost                                              48,987       (48,987)              -
                                                      ------------  ------------  ------------- 
     Total assets                                     $    46,011   $   (27,371)  $     427,872
                                                      ============  ============  ============= 

        LIABILITIES AND SHAREHOLDERS' EQUITY

Accrued and other liabilities                         $         -   $         -   $       6,906
Notes payable                                                   -             -          14,526
Minority interest                                               -             -         139,488
Shareholder's equity:
   Common stock , $.10 par value, 100,000,000 
    shares authorized 7,728,000 issued and 
    outstanding (13,981,938 pro forma shares
    issued and outstanding)                                 228             -           1,399
   Series A                                                     -           (18)              -
   Series B                                                     -            (2)              -
   Series C                                                     -            (5)              -
   Paid-in capital                                         45,783       (32,421)        265,949
   Cumulative net income                                        -       (29,451)          3,154
   Cumulative distribution paid                                 -        34,526          (3,550)
                                                      ------------  ------------  ------------- 
       Total shareholders' equity                          46,011       (27,371)        266,952
                                                      ------------  ------------  ------------- 
   Total liabilities and shareholders' equity         $    46,011   $   (27,371)  $     427,872
                                                      ============  ============  ============= 

Book value per share of common stock (Note 4)                                    $       19.09
                                                                                  ============= 

Shares outstanding                                                                  13,981,942
                                                                                  =============
</TABLE>
        See accompanying notes to pro forma consolidated balance sheet.
                                       24
<PAGE>


                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                                December 31, 1997
                                   (Unaudited)



1.   ACQUISITION OF REAL ESTATE FACILITIES

     On January 13, 1998, AOPP purchased the Ammendale property for an aggregate
     cost of  $22,643,000  consisting  of  $22,450,000  cash and the issuance of
     8,428 OP Units having a value of $193,000.

     In March 1998, AOPP purchased one commercial  property and had an agreement
     in  principle  to  purchase   another   commercial   property  (the  "March
     Acquisitions,"  referred to as the "Proposed Acquisition Properties" in the
     Proxy Statement dated February 5, 1998) from unaffiliated third parties for
     an  aggregate  cost of  $33,139,000,  composed  of  $17,600,000  cash,  the
     issuance  of  44,250  OP  Units  having  a  value  of  $1,013,000,  and the
     assumption of mortgage notes payable of $14,526,000.

     The  following  pro  forma  adjustments  have  been  made to the pro  forma
     consolidated  balance  sheet  as  of  December  31,  1997  to  reflect  the
     acquisition and proposed  acquisitions of the above  commercial  properties
     and the related issuance of OP Units:
<TABLE>
<CAPTION>
                                                                                            in (000's)

                                                                                           -------------
                                                                                             
       * Cash and cash equivalents has been decreased to reflect the cash
         portion of the acquisition cost of the properties purchased, as
         follows:
             <S>                                                                           <C>          
             March Acquisitions................................................            $    (17,600)
             Ammendale Property................................................                 (22,450)
                                                                                           -------------
                                                                                           $    (40,050)
                                                                                           =============

       * Real  estate  facilities  has been  adjusted  to reflect  the
         acquisition cost of the facilities acquired:
             March Acquisitions................................................            $     33,139
             Ammendale Property................................................                  22,643
                                                                                           -------------
                                                                                           $     55,782
                                                                                           =============
       * Notes payable has been increased to reflect the principal balance of
         related notes expected to be assumed by AOPP in connection with the
         March Acquisitions....................................................            $     14,526
                                                                                           =============

       * Minority  interest has been increased to reflect the issuance
         of 52,678 OP Units in connection  with the  acquisition of the
         March
         Acquisitions and Ammendale properties.................................            $      1,206
                                                                                           =============
</TABLE>

2.    OTHER ADJUSTMENTS


     On  December  24,  1997,  AOPP  completed a  transaction  where AOPP issued
     1,785,007  OP  Units  and   3,504,758   shares  of  AOPP  common  stock  to
     subsidiaries  of a state pension fund,  and the  subsidiaries  of the state
     pension fund,  through a merger and  contribution,  transferred to AOPP six
     commercial  properties  ($118,655,000)  and  $1,000,000  cash.  The Company
     incurred a total of $3,300,000 in transaction costs. Approximately $400,000
     of these costs were paid in December 1997 and approximately $2,900,000 were
     paid in January 1998.

                                       25
<PAGE>

     On January 9, 1998, the  subsidiary,  which was issued OP Units,  exercised
     its option to convert the OP Units into  shares of AOPP  common  stock on a
     one-for-one basis.

     In  January  1998,   AOPP  entered  into  an  agreement  with  a  group  of
     institutional investors under which AOPP would issue up to 6,744,074 shares
     of AOPP common  stock at $22.88 per share in separate  tranches.  The first
     traunche,  2,185,189  shares or $50.0 million,  was issued in January 1998.
     The  remainder  of the shares are to be issued as the funds are required by
     AOPP, in minimum  increments  of $20 million.  Funds from the first tranche
     were  utilized to repay a  $3,500,000  loan due to PSI,  to fund  remaining
     unpaid costs related to the subsidiary of a state pension fund transaction,
     and to complete the real estate transactions that occurred in 1998.

     The following pro forma  adjustments have been made to reflect the issuance
     of $50.0  million of AOPP  Common  Stock to  institutional  investors,  the
     conversion of the OP Units into shares of AOPP stock,  AOPP's payoff of its
     loan from PSI,  and the  payment  of  remaining  transaction  costs for the
     subsidiary of the state pension fund transaction.
<TABLE>
<CAPTION>

                                                                                                    (in 000's)
                                                                                                 ----------------

                  <S>                                                                            <C> 
                  *Cash and cash equivalents has been increased to reflect the net
                  proceeds from the issuance of common stock to institutional investors
                  (gross proceeds of $50,000,000 less estimated offering costs of                $        47,600
                  $2,400,000).............................................................

                  *Cash and cash  equivalents have been decreased to reflect the
                  utilization   of  a   portion   of  the   proceeds   from  the
                  institutional  investors to repay the  $3,500,000  loan due to
                  PSI, and to reflect the
                  payment of $2,900,000 in transaction costs which were unpaid and                       
                  accrued at December 31, 1997............................................                (6,400)
                                                                                                 ----------------
                                                                                                 $        41,200
                                                                                                 ================
                  *Accounts payable and accrued liabilities have been reduced to reflect
                  the payment of transaction costs which were unpaid and accrued at
                  December 31, 1997.......................................................                (2,900)
                                                                                                 ================

                  *Notes payable have been reduced to reflect the repayment of a
                  $3,500,000 loan due to PSI..............................................       $        (3,500)
                                                                                                 ================

                  *Common  Stock has been  adjusted  to  reflect  the  following items:

                      *Conversion of 1,785,007 OP Units into AOPP common stock............       $           179

                      *Issuance of 2,185,189 shares of AOPP common stock to institutional
                      investors...........................................................                   219
                                                                                                 ----------------
                                                                                                 $           398
                                                                                                 ================

                  *Paid in capital has been  adjusted  to reflect the  following items:

                      *Conversion of 1,785,007 OP Units into AOPP common stock............       $        30,204

                      *Issuance of 2,185,189 shares of AOPP common stock to institutional
                      investors...........................................................                47,381
                                                                                                 ----------------
                                                                                                 $        77,585
                                                                                                 ================

                  *Minority Interest has been adjusted to reflect the conversion of
                  1,785,007 OP Units into AOPP common stock...............................       $       (30,383)
                                                                                                 ================
</TABLE>

                                       26
<PAGE>

3.    MERGER PRO FORMA ADJUSTMENTS


     The Merger will be accounted  for using the purchase  method of  accounting
     with AOPP being the  accounting  acquirer.  The total purchase cost will be
     allocated to the  acquired  net assets of PSP11;  first to the tangible and
     identifiable  intangible  assets and liabilities  acquired based upon their
     respective  fair values,  and the remainder will be allocated to the excess
     of  purchase  cost  over  fair  value  of  assets  acquired,  if any.  Upon
     completion of the Merger,  the outstanding shares of AOPP common stock were
     converted into an aggregate of 11,698,505  shares of PSP11 Common Stock and
     the surviving entity was renamed "PS Business Parks, Inc."

     In determining the cost of the Merger,  AOPP evaluated as a measure of cost
     of the Merger (i) the aggregate fair value of PSP11's net assets  acquired,
     (ii) the fair value of PSP11's Common Stock traded in the market, and (iii)
     the cash  election  price of $20.50 per share of PSP11 Common  Stock.  AOPP
     determined that the use of the cash price of $20.50 was a reliable  measure
     of the Merger cost; further, that such cash price was materially equivalent
     to the Merger cost had either of the other alternatives been chosen,  based
     upon the following:

               *The  fair  value  of  the  net  assets  of  PSP11  were  readily
               determinable   as  of  August  15,  1997  (date  the  Merger  was
               announced).  Substantially all of the PSP11 assets were comprised
               of real estate  facilities  having  current  appraised  values as
               determined by  independent  appraisers.  The estimated fair value
               per share of PSP11 Common Stock at August 15, 1997 based upon the
               fair values of the net assets was approximately $20.50 per share.

               *Since  AOPP is the  accounting  acquirer,  AOPP's  common  stock
               market  price would have been an  indicator  of the Merger  cost.
               However,   AOPP's   common   stock  was  not   publicly   traded,
               accordingly,   AOPP   evaluated   PSP11's   common   stock  as  a
               determination  of AOPP's implied  common stock value.  The market
               price of PSP11's Common Stock from January 1, 1997 through August
               15,  1997 ranged from  $20-3/8 to $19-3/8.  The closing  price of
               PSP11's  Common  Stock on August 15,  1997,  was $20.00.  PSP11's
               trading price for the one month period after the  announcement of
               the  proposed  Merger  traded  in the  range  from  $19-15/16  to
               $20-9/16.

               *Each  outstanding share of PSP11 Common Stock with the exception
               of 106,155  shares,  which elected to receive  $20.50 in cash per
               share, continued to be owned by current holders.

     In determining the fair value of the net assets to be acquired,  historical
     carrying  values as of December  31, 1997 were used with respect to PSP11's
     other assets and accrued  liabilities since they approximate fair value and
     appraised  values  were  used  for  PSP11's  real  estate  facilities.  The
     aggregate  purchase cost and its  preliminary  allocation to the historical
     assets and liabilities is as follows:

                                       27
<PAGE>

<TABLE>
<CAPTION>

                                                                                                        (in 000's)
                                                                                                     -----------------
         PURCHASE COST:

                  <S>                                                                                   <C>
                  *Issuance  of  1,713,782  shares  of Common  Stock to  PSP11's
                  Series A common  shareholders  (1,819,937  shares  outstanding
                  less shares electing cash of 106,155) at $20.50 per share............                 $   35,133

                  *Issuance of 569,655  shares of Common Stock to the holders of
                  PSP11's  Common Stock Series B and Series C (707,071  combined
                  shares  outstanding  less  cancellation  of  47,824  shares of
                  Series  C  the   remaining  of  which  is  multiplied  by  the
                  conversion ratio of 0.8641) at $20.50 per share......................                     11,678

                  *Cash elections (106,155 shares of the Series A Common Stock of
                  PSP11 elected to receive $20.50 per share in cash in the Merger).....                      2,176
                                                                                                     -----------------
                   Total Purchase Cost.................................................                 $   48,987
                                                                                                     =================


         PRELIMINARY ALLOCATION OF PURCHASE COST:



              Cash..................................................................                    $    2,455
              Other assets..........................................................                           454
              Accrued and other liabilities.........................................                        (1,475)
              Real estate facilities (fair value of $48,000,000 less $447,000 of
                excess aggregate fair values of net assets acquired over purchase                           
                cost)...............................................................                        47,553
                                                                                                     -----------------
                                                                                                        $   48,987
                                                                                                     =================
     The following pro forma adjustments have been made to reflect the Merger as
     of December 31, 1997:

         PURCHASE ADJUSTMENTS:

                  *Cash and cash  equivalents  have been  reduced to reflect the
                  cash necessary to satisfy cash elections ($2,176,000) combined
                  with estimated direct costs and expenses of the merger of $800,000....                $   (2,976)
                                                                                                     =================
                  *Unallocated purchase cost has been increased to reflect the
                  aggregate purchase cost...............................................                $   48,987
                                                                                                     =================
                  *Common stock has been increased to reflect the issuance of 2,283,437
                  shares with a par value of $0.10 per share............................                $      228
                                                                                                     =================
                  *Paid-in Capital has been increased to reflect the issuance of
                  common  stock  ($46,811,000  less par  value of  $228,000  and
                  estimated direct costs and expenses of the Merger of $800,000).........                $   45,783
                                                                                                     =================
</TABLE>
                                       28


<PAGE>

<TABLE>
<CAPTION>
                                                                                                        (in 000's)
                                                                                                     -----------------
         VALUATION ADJUSTMENTS:

                  <S>                                                                                   <C>
                  *Unallocated purchase cost has been decreased to reflect the allocation
                  of the aggregate purchase cost..........................................              $  (48,987)
                                                                                                     =================

                  *Real estate facilities has been increased to reflect the fair value of
                  the real estate facilities to be acquired in the Merger (purchase price
                  allocation of $47,553,000 plus related net historical cost of
                  management contracts on AOPP's books with respect to such properties
                  ($1,540,000) less PSP11 historical net book value of $25,937,000).......              $   23,156
                                                                                                     =================

                  *AOPP's intangible assets have been reduced to reflect the
                  reclassification to real estate with respect to the above pro forma                   
                  adjustment..............................................................              $   (1,540)
                                                                                                     =================

                  *PSP11's historical equity has been eliminated as follows:
                  Series A common stock................................................                 $      (18)
                  Series B common stock................................................                         (2)
                  Series C common stock................................................                         (5)
                  Paid-in-capital......................................................                    (32,421)
                  Cumulative net income................................................                    (29,451)
                  Cumulative distributions.............................................                     34,526
                                                                                                     -----------------
                                                                                                        $  (27,371)
                                                                                                     =================
</TABLE>

         EXCHANGE OF PROPERTIES


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 the  mini-warehouse  facilities  is
approximately  $42,400,000  compared  to the  fair  value  of the 11  commercial
properties received of $42,900,000. Through the pro forma adjustments above, the
commercial  facilities are reflected on the pro forma consolidated balance sheet
at their fair  approximate  values as a result of the accounting  acquisition of
PSP11 by AOPP. No additional  adjustments have been made to reflect the Exchange
as the relative valuations are nearly the same.

                                       29

<PAGE>



4.       BOOK VALUE PER SHARE OF COMMON STOCK

     Book value per share has been  determined by dividing  total  shareholders'
     equity by the outstanding shares of Common Stock. The following  summarizes
     the shares outstanding:

<TABLE>
<CAPTION>
                                                                                                  Common shares
                                                                                                   outstanding
                                                                                                -----------------

              <S>                                                                                   <C>      
              *AOPP historical shares outstanding at December 31, 1997................               7,728,309
              *AOPP shares issued to subsidiary of state pension fund in connection
                with conversion of its OP Units into common stock of AOPP.............               1,785,007
              *Pro forma shares issued to institutional investors.....................               2,185,189
                                                                                                -----------------
                          Pre-Merger pro forma AOPP shares outstanding................              11,698,505

              *PSP11's Series A shares (see "Purchase cost" above)....................               1,713,782

              *PSP11's Series B and C (see "Purchase cost" above).....................                 569,655
                                                                                                -----------------

                          Post-Merger pro forma AOPP shares outstanding...............              13,981,942
                                                                                                =================
</TABLE>
                                       30

<PAGE>


                             PS BUSINESS PARKS, INC.
                   PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                      For the Year Ended December 31, 1997
                                   (Unaudited)
                  (Amounts in thousands, except per share data)


<TABLE>
<CAPTION>
                                                                                AOPP
                                            ---------------------------------------------------------------                
                                                                                                                           
                                                                       Pro Forma Adjustments                               
                                                          -----------------------------------------------                  
                                                          Acquisition of   Acquisition of                                  
                                                            real estate     real estate         Other            AOPP      
                                               AOPP       from affiliates    from third      adjustments      Pre-Merger   
                                           (Historical)      (Note 1)      parties (Note 2)   (Note 3)      (Pro forma)    
                                           ------------   ---------------  ---------------- -------------   -------------        
REVENUES:
   Rental income:
     <S>                                    <C>            <C>             <C>               <C>             <C>           
     Commercial properties                  $   30,169     $    1,038      $   27,024        $        -      $   58,231    
     Mini-warehouse properties                       -              -               -                 -               -    
   Facility management fees                        956            (52)              -                 -             904    
   Interest and other income                       453              -               -                 -             453    
                                           ------------   ---------------  ---------------- -------------   -------------        
                                                31,578            986          27,024                 -          59,588    
                                           ------------   ---------------  ---------------- -------------   -------------        
EXPENSES:
   Cost of operations:
     Commercial properties                      12,330            363           7,759                 -          20,452    
     Mini-warehouse properties                       -              -               -                 -               -    
   Cost of managing facilities                     189            (12)              -                 -             177    
   Depreciation and amortization                 5,195             92           5,526                 -          10,813    
   General and administrative                    1,461              -               -               300           1,761    
   Interest expense                                  1              -           1,105                 -           1,106    
                                           ------------   ---------------  ---------------- -------------   -------------        
                                                19,176            443          14,390               300          34,309    
                                           ------------   ---------------  ---------------- -------------   -------------        

   Income before minority interest in
     income                                     12,402            543          12,634              (300)         25,279    
   Minority interest in income (Note 7)         (8,566)             -               -            (1,217)         (9,783)   
                                           ------------   ---------------  ---------------- -------------   -------------        

   Net income (loss)                            $3,836           $543         $12,634           $(1,517)        $15,496    
                                           ============   ===============  ================ =============   =============        
   PER SHARE OF COMMON STOCK:
   Net income (Note 4 and 6)                $     1.23                                                       $     1.32    
                                           ============                                                     =============        

   Weighted average shares (Note 4 and 6)        3,117                                                           11,698    
                                           ============                                                     =============        
</TABLE>

<TABLE>
<CAPTION>
                                                                                
                                                               Pro Forma
                                                                Merger
                                                              Adjustments
                                                             -------------
                                                              Exchange of
                                                              real estate         PSBP
                                                PSP11         facilities      Post-Merger
                                            (Historical)      (Note 5)       (Pro forma)
                                            ------------    --------------   -------------       
REVENUES:
   Rental income:
     <S>                                     <C>             <C>              <C>       
     Commercial properties                   $    1,418      $    8,008       $   67,657
     Mini-warehouse properties                    6,143          (6,143)               -
   Facility management fees                           -            (471)             433
   Interest and other income                         82               -              535
                                            ------------    --------------   -------------       
                                                  7,643           1,394           68,625
                                            ------------    --------------   -------------       
EXPENSES:
   Cost of operations:
     Commercial properties                          682           3,271           24,405
     Mini-warehouse properties                    2,082          (2,082)               -
   Cost of managing facilities                        -             (93)              84
   Depreciation and amortization                  1,198             146           12,157
   General and administrative                       201               -            1,962
   Interest expense                                   -               -            1,106
                                            ------------    --------------   -------------       
                                                  4,163           1,242           39,714
                                            ------------    --------------   -------------       

   Income before minority interest in
     income                                       3,480             152           28,911
   Minority interest in income (Note 7)               -            (210)          (9,993)
                                            ------------    --------------   -------------       

   Net income (loss)                             $3,480            $(58)         $18,918
                                            ============    ==============   =============       
   PER SHARE OF COMMON STOCK:
   Net income (Note 4 and 6)                 $     1.38                       $     1.35
                                            ============                     =============       

   Weighted average shares (Note 4 and 6)         2,527                           13,982
                                            ============                     =============       
</TABLE>


     See accompanying notes to pro forma consolidated statements of income.
                                       31
<PAGE>


                             PS BUSINESS PARKS, INC.
              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                      For the Year Ended December 31, 1997
                                   (Unaudited)



1.        ACQUISITION OF REAL ESTATE FACILITIES FROM AFFILIATES 
          (THE "ACQUIRED PROPERTIES")

         On April 1, 1997, the Operating  Partnership  acquired four  commercial
         properties from PSI in exchange for 1,480,968 OP Units.

         The  following  pro forma  adjustments  have been made to the pro forma
         consolidated  statements  of  income  to  reflect  the  above as if the
         transaction was completed as of January 1, 1997:

<TABLE>
<CAPTION>

                                                                                                           (in 000's)
                                                                                                         ---------------
              <S>                                                                                         <C>    
              *Rental income has been increased to reflect:
                  *the pro forma rental income as if the real estate facilities acquired on
                  April 1, 1997 were owned by AOPP throughout the entire period..................         $     4,127
                  *less the rental income with respect to these properties included in AOPP's
                  historical amounts.............................................................              (3,089)
                                                                                                         ---------------
                      Total incremental rental income............................................         $     1,038
                                                                                                         ===============

              *Facility  management  fee income has been  decreased to eliminate
              AOPP's historical management fee income (5% of rental income) with
              respect to the commercial properties acquired on April 1, 1997, as
              such fee is not collected
              on owned facilities...........................................................              $       (52)
                                                                                                         ===============
              *Cost of operations has been increased as follows:
                  *To reflect  the pro forma cost of  operations  as if the real
                  estate facilities acquired on April 1, 1997 were owned by AOPP
                  throughout the entire full period.........................................              $     1,227
                  *The above adjustment excludes facility management fees,  accordingly,  a
                  pro forma adjustment has been made to reflect the actual cost of
                  management................................................................                       41
                  *To eliminate cost of operations included in AOPP's historical amounts....                     (905)
                                                                                                         ---------------
                      Total incremental cost of operations..................................              $       363
                                                                                                         ===============

              *Cost of managing  facilities  has been decreased to eliminate the
              costs  associated  with the  management fee income with respect to
              the  properties  acquired  on  April 1,  1997.  The  reduction  in
              management fee income will result
              in a reduction in cost of operations with respect to facility management......              $       (12)
                                                                                                         ===============

              *Depreciation has been increased to reflect the incremental depreciation of
              the commercial properties acquired on April 1, 1997...........................              $        92
                                                                                                         ===============
</TABLE>
                                       32
<PAGE>


2.       ACQUISITION OF REAL ESTATE FACILITIES FROM THIRD PARTIES


         During 1997 and 1998,  AOPP has  completed the  acquisition  of several
         properties  and has an agreement in principle to acquire one additional
         property:

               *Baldon  Properties:  In July 1997, AOPP issued 2,025,769 shares
                of common stock primarily to PSI for cash totaling  $33,800,000.
                AOPP used  substantially  all of the  proceeds  to  acquire  two
                commercial  properties in July 1997 from an  unaffiliated  third
                party for $33,750,000 in cash.

                *Largo  Property:  On  September  24,  1997,  AOPP  acquired one
                commercial  property  for  an  aggregate  cost  of  $10,374,000,
                consisting  of  $10,050,000  cash and the  issuance of 14,384 OP
                units having a value of $324,000.

                *On December 10, 1997, AOPP purchased a commercial property (the
                "Northpointe  Property") for  $3,875,000,  consisting of cash of
                $3,575,000 and the issuance of 13,111 OP units having a value of
                $300,000.

                *Acquiport  Properties:  On December 24, 1997,  AOPP completed a
                transaction  where AOPP issued  1,785,007 OP Units and 3,504,758
                shares of AOPP common stock to a subsidiary  of a state  pension
                fund,  and the  subsidiary of the state pension fund,  through a
                merger  and  contribution,  transferred  to AOPP six  commercial
                properties  ($118,655,000)  and  $1,000,000  cash.  The  Company
                incurred  $3,300,000 in transaction  costs. In January 1998, the
                subsidiary  of the state  pension fund  exercised  its option to
                convert the OP units into shares of AOPP common stock.

                *On January 13, 1998, AOPP purchased a commercial  property (the
                "Ammendale  Property")  for  $22,643,000,  consisting of cash of
                $22,450,000 and the issuance of 8,428 OP units having a value of
                $193,000.

                *March Acquisition Properties: In March 1998, AOPP purchased two
                commercial  properties  from  unaffiliated  third parties for an
                aggregate  cost  of  $33,139,000  consisting  of  cash  totaling
                $17,600,000,  the  issuance of 44,250 OP Units having a value of
                $1,013,000 and the assumption of $14,526,000 of mortgage debt.

         The  following  pro forma  adjustments  have been made to  reflect  the
         operations of these  properties as if such properties had been acquired
         at the beginning of the year:
<TABLE>
<CAPTION>
                                                                                                               (000's)
                                                                                                          ---------------

              <S>                                                                                           <C>  
              *Rental income has been  increased to reflect the pro forma rental
              income of the  properties,  as if these  facilities  were owned by
              AOPP throughout 1997:
                   *Rental income for 1997 for the following properties:
                      Baldon properties .......................................................             $    6,570
                      Largo property...........................................................                  1,343
                      Acquiport  properties....................................................                 14,813
                      Northpointe Property.....................................................                    631
                      Ammendale Property.......................................................                  2,883
                      March Acquisitions.......................................................                  3,916
                   *Less:  the portion of rental income with respect to these properties which
                   has been included in AOPP's historical amounts..............................                 (3,132)
                                                                                                          ---------------
                                                                                                            $   27,024
                                                                                                          ===============
</TABLE>
                                       33
<PAGE>

<TABLE>
<CAPTION>

                                                                                                             (000's)
                                                                                                          ---------------
                  *Cost of operations has been increased to reflect the pro forma cost of
                  operations of these properties,  as if they were owned by AOPP
                  throughout the entire period presented:

                  *Cost  of  operations   for  the  entire  year's   properties'
                    historical operations:

                      <S>                                                                                   <C>       
                      Baldon.................................................................               $    2,280
                      Largo..................................................................                      367
                      Acquiport Properties...................................................                    3,059
                      Northpointe Property...................................................                      125
                      Ammendale Property.....................................................                      640
                      March Acquisitions.....................................................                    1,089
                       Less: the portion of cost of operations with respect to these
                      properties which has been included in AOPP's historical amounts........                   (1,157)
                       Plus:  Pro forma adjustment to reflect additional estimated personnel
                      cost to manage the facilities and property taxes.......................                    1,356
                                                                                                          ---------------
                                                                                                            $    7,759
                                                                                                          ===============

                  *Depreciation has been increased to reflect a full year's 
                  depreciation expense.......................................................               $    5,526
                                                                                                          ===============
                  *Interest expense has been increased to reflect the historical
                  interest  expense  for  each  of the  periods  presented  with
                  respect to the assumption
                  of mortgage notes payable ................................................                $    1,105


3.        OTHER PRO FORMA ADJUSTMENTS


              *A pro forma  adjustment  has been made to  increase  general  and
              administrative expense to reflect additional costs with respect to
              payroll as AOPP hires acquisition and executive personnel......................              $       300
                                                                                                          ===============

              *Many of the properties acquired were acquired by the consolidated
              Operating  Partnership  in  exchange  for OP Units  of AOPP.  Such
              ownership  interests are  represented as minority  interest in the
              consolidated  financial  statements.   Accordingly,  a  pro  forma
              adjustment has been made to increase "Minority interest in income"
              to  reflect  the  incremental  income  associated  with pro  forma
              adjustments  allocable to the minority interest  (representing the
              difference  between  the pro  forma  amounts  less the  historical
              amounts included in AOPP's historical financial statements)....................               $   (1,217)
                                                                                                          ===============

</TABLE>
                                       34

<PAGE>


4.        NET INCOME PER COMMON SHARE (AOPP PRE-MERGER PRO FORMA)
          HAS BEEN COMPUTED AS FOLLOWS:

<TABLE>
<CAPTION>
                                                                                                            (000's)

           <S>                                                                                         <C>          
           Historical net income.........................................................               $   3,836,000

           Historical weighted average common shares.....................................                   3,116,688

           Historical net income per common share........................................               $       1.23

           Pro forma net income..........................................................               $  15,496,000

           Pro forma weighted average common shares (1)..................................                  11,698,505

           Pro forma net income per common share.........................................               $       1.32

           ---------------------------------------------------------------------------------------- ---------------------
           (1)
           Historical weighted average shares (common and equivalents)...................                   3,116,688
           Adjusted for:

               Issuance  of  common  shares  in  July  1997 in  connection  with
                  property acquisitions  (2,025,769 shares less 851,507 included
                  in the historical
                  amounts)...............................................................                   1,174,262

               Issuance of common stock to subsidiary of a state pension fund on
                  December  24,  1997  (3,504,758   shares  less  67,399  shares
                  included in the
                  historical amounts)....................................................                   3,437,359

               Issuance of common stock to subsidiary of a state pension fund in
                  connection with conversion of OP Units into common stock...............                   1,785,007

               Pro forma issuance of common stock to institutional investors.............                   2,185,189
                                                                                                          ---------------
                    Total Pre-Merger pro forma weighted average shares...................                  11,698,505
                                                                                                          ===============
</TABLE>
                                       35

<PAGE>


5.        PRO FORMA MERGER ADJUSTMENTS - EXCHANGE OF PROPERTIES:


         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.
<TABLE>
<CAPTION>

                                                                                                             (000's)
                                                                                                         ----------------

               <S>                                                                                         <C>
               *Rental  income-  commercial  properties  has been  increased  to
               reflect  the rental  income  with  respect  to the 11  commercial
               properties received through
               the Exchange..................................................................              $       8,008
                                                                                                         ================

               *Rental income-  mini-warehouses  has been decreased to eliminate
               the  rental   income  with  respect  to  the  11   mini-warehouse
               facilities and two properties that combine mini-warehouse and 
               commercial space given up through the Exchange................................              $      (6,143)
                                                                                                         ================

               *A pro forma adjustment has been made to facility management fees to:
                   *eliminate the historical facility management fees related to 11
                   commercial properties acquired in the Exchange as such fee will no longer
                   be charged to these properties as AOPP will own them......................              $        (400)
                   *eliminate the historical facility management fees related to the two
                   commercial properties of PSP11 acquired in the Merger.....................                        (71)
                                                                                                         ----------------
                                                                                                           $        (471)
                                                                                                         ================

               *A pro forma adjustment has been made to cost of operations to:
                   *eliminate historical  management fees paid to AOPP to manage
                   PSP11's  two  commercial  properties  which are  included  in
                   historical amounts and as a
                   result of the Merger will no longer be incurred...........................              $         (71)
                   *reflect the cost of operations of the 11 commercial properties acquired
                   in the Exchange (before cost of management)...............................                      3,249
                   *reflect the cost of management for PSP11's two commercial properties and
                   the 11 commercial properties acquired in the Exchange.....................                         93
                                                                                                         ----------------
                                                                                                           $       3,271
                                                                                                         ================


               *Cost  of  operations-  mini-warehouses  has  been  decreased  to
               eliminate  the  cost  of  operations   with  respect  to  the  11
               mini-warehouse   facilities  and  two  properties   that  combine
               mini-warehouse and commercial space given up through
               the Exchange..................................................................              $      (2,082)
                                                                                                         ================


               *Cost of managing  facilities has been decreased to eliminate the
               historical cost of managing the two PSP11  commercial  properties
               and the 11 commercial  properties acquired in the Exchange,  such
               costs are reclassified to Cost of
               operations- commercial properties.............................................              $         (93)
                                                                                                         ================

</TABLE>


                                       36
<PAGE>
<TABLE>
<CAPTION>

               *A pro forma adjustment has been made to depreciation  expense to
               reflect the:
  
                   <S>                                                                                     <C>                    
                   *Eliminate the historical depreciation expense of PSP11's facilities......              $      (1,198)

                   *Record  depreciation  expense  based on the acquired cost of
                   the  remaining  PSP11  facilities   ($47,553,000   cost,  30%
                   allocated to land, the remaining cost allocated to buildings, 
                   depreciated straight-line over 25 years)..................................                      1,344
                                                                                                         ----------------
                                                                                                           $         146
                                                                                                         ================
                A pro forma  adjustment  has been made to increase  the minority
               interests'  share of  income  based  upon its pro rata  ownership
               interest in the above pro
               forma adjustments.............................................................              $        (210)
                                                                                                         ================
</TABLE>

                                       37
<PAGE>


6.       POST-MERGER PRO FORMA NET INCOME PER SHARE OF 
         COMMON STOCK HAS BEEN COMPUTED AS FOLLOWS:

<TABLE>
<CAPTION>
                                                                                                              Year Ended
                                                                                                           December 31, 1997
                                                                                                         ----------------------

           <S>                                                                                              <C>           
           Post-Merger pro forma net income                                                                 $   18,918,000
          
           Post-Merger pro forma weighted average common shares (1)                                             13,981,942

           Pro forma net income per share of Common Stock                                                   $         1.35


           ---------------------------------------------------------------------------------------------------------------------
           (1)
           Pre-Merger pro forma weighted average shares from Note 4 above                                       11,698,505

           PSP11's Series A shares (see Note 4 to the Pro Forma Consolidated Balance Sheet)                      1,713,782

           PSP11's Series B and C (see Note 4 to the Pro Forma Consolidated Balance Sheet)                         569,655
                                                                                                         ----------------------

           Post-Merger pro forma weighted average Common Stock common shares                                    13,981,942
                                                                                                         ======================

7.       MINORITY INTEREST:


         Minority  interest  represents  ownership  interests of OP Units in the
         consolidated  Operating Partnership which are not owned by AOPP. The OP
         Units,  subject  to certain  conditions  of the  Operating  Partnership
         Agreement,  are convertible into Common Shares of AOPP on a one-for-one
         basis.  Pro forma  weighted  average OP Units  outstanding  during each
         period owned by minority  interests  totaled  7,385,527.  The following
         table summarizes the ownership interests:

                                                                                                              Year Ended
                                                                                                           December 31, 1997
                                                                                                         ----------------------
           Pro forma AOPP Common Shares outstanding.............................................                13,981,942
           Pro  forma  OP  Units  owned  by  minority   interests   which  are
            convertible into AOPP Common Shares.................................................                 7,385,527
                                                                                                         ----------------------     
           Total AOPP Common Shares outstanding assuming conversion of OP Units.................                21,367,469
                                                                                                         ======================

           Percentage ownership of AOPP Common Shares outstanding...............................                  65.4%
           Percentage ownership of minority interests...........................................                  34.6%
                                                                                                         ----------------------
                Total ownership interest........................................................                 100.0%
                                                                                                         ======================
</TABLE>
                                       38




                                                                  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 of our report dated
February 23, 1998 except for Note 9 as to which the date is March 18, 1998, with
respect to the  consolidated  financial  statements of PS Business  Parks,  Inc.
(successor to American  Office Park  Properties,  Inc.)  included in the Current
Report on Form 8-K/A dated April 17, 1998 of PS Business Parks, Inc.



                                                          /s/ ERNST & YOUNG LLP



Los Angeles, California
April 17, 1998




<TABLE> <S> <C>


<ARTICLE>                     5
<CIK>                                            0000866368
<NAME>                                           PS BUSINESS PARKS. INC.
<MULTIPLIER>                                                          1
<CURRENCY>                                                       U.S. $
       
<S>                                                                 <C>
<PERIOD-TYPE>                                                    12-MOS
<FISCAL-YEAR-END>                                           DEC-31-1997
<PERIOD-START>                                              JAN-01-1997
<PERIOD-END>                                                DEC-31-1997
<EXCHANGE-RATE>                                                       1
<CASH>                                                        3,884,000
<SECURITIES>                                                          0
<RECEIVABLES>                                                         0
<ALLOWANCES>                                                          0
<INVENTORY>                                                           0
<CURRENT-ASSETS>                                              3,884,000
<PP&E>                                                      314,238,000
<DEPRECIATION>                                              (3,982,000)
<TOTAL-ASSETS>                                              323,454,000
<CURRENT-LIABILITIES>                                        11,831,000
<BONDS>                                                               0
                                                 0
                                                           0
<COMMON>                                                        773,000   
<OTHER-SE>                                                  142,185,000
<TOTAL-LIABILITY-AND-EQUITY>                                323,454,000
<SALES>                                                               0         
<TOTAL-REVENUES>                                             31,578,000
<CGS>                                                                 0
<TOTAL-COSTS>                                                12,519,000
<OTHER-EXPENSES>                                              6,656,000
<LOSS-PROVISION>                                                      0
<INTEREST-EXPENSE>                                                1,000
<INCOME-PRETAX>                                               3,836,000
<INCOME-TAX>                                                          0
<INCOME-CONTINUING>                                           3,836,000
<DISCONTINUED>                                                        0
<EXTRAORDINARY>                                                       0
<CHANGES>                                                             0
<NET-INCOME>                                                  3,836,000
<EPS-PRIMARY>                                                      1.23
<EPS-DILUTED>                                                      1.23
        

</TABLE>


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