PS BUSINESS PARKS INC/CA
10-Q, 1999-05-17
REAL ESTATE INVESTMENT TRUSTS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-Q


[X] Quarterly Report Pursuant to Section 13 or 15(d) of the Securities  Exchange
Act of 1934

For the quarterly period ended March 31, 1999

                                       or

[ ] Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange
Act of 1934

For the transition period from __________ to __________

Commission File Number 1-10709
                       -------

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


        California                                          95-4300881
(State or Other Jurisdiction                             I.R.S. Employer
- ----------------------------                          ---------------------- 
     of Incorporation)                                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
                                                           --------------      






Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports)  and  (2)  has  been  subject  to such  filing
requirements for the past 90 days.

                                    Yes X No

Number of shares outstanding of each of the issuer's classes of common stock, as
- --------------------------------------------------------------------------------
of May 11, 1999: Common Stock, $0.01 par value, 23,637,410 shares outstanding
- --------------------------------------------------------------------------------

<PAGE>

                             PS BUSINESS PARKS, INC.

                                      INDEX
<TABLE>
<CAPTION>

                                                                                                      Page
                                                                                                      ----   
<S>                                                                                                   <C>

PART I.  FINANCIAL INFORMATION

 Item 1.  Financial Statements

   Condensed consolidated balance sheets as of March 31, 1999 and December 31, 1998.......              2

   Condensed consolidated  statements of income for the three months ended March 31, 1999 and
   1998...................................................................................              3

   Condensed  consolidated statement of shareholders' equity for the three months ended March
   31, 1999...............................................................................              4

   Condensed consolidated statements of cash flows for the three months ended March 31, 1999          5 - 6

   Notes to condensed consolidated financial statements...................................            7 - 16                      

 Item 2.  Management's  discussion  and  analysis  of  financial  condition  and  results  of
 operations...............................................................................           17 - 23


PART II.  OTHER INFORMATION

 Item 1.  Legal Proceedings...............................................................              24

 Item 6.  Exhibits & Reports on Form 8-K..................................................              24
</TABLE>


<PAGE>

                             PS BUSINESS PARKS, INC.
                      CONDENSED CONSOLIDATED BALANCE SHEETS
  

<TABLE>
<CAPTION>

                                                                             March 31,                December 31,
                                                                               1999                      1998
                                                                          ----------------         ---------------  
                                                                           (unaudited)

                                     ASSETS
                                     ------
<S>                                                                       <C>                     <C>
Cash and cash equivalents...............................                  $     1,299,000         $     6,068,000

Real estate facilities, at cost:
     Land...............................................                      180,245,000             176,241,000
     Buildings and equipment............................                      559,686,000             536,697,000
                                                                          ---------------         ---------------   
                                                                              739,931,000             712,938,000
     Accumulated depreciation...........................                      (29,175,000)            (22,517,000)
                                                                          ---------------         ---------------  
                                                                              710,756,000             690,421,000
Construction in progress................................                       11,593,000               7,716,000
                                                                          ---------------         ---------------  
                                                                              722,349,000             698,137,000

Intangible assets, net..................................                        1,508,000               1,583,000
Other assets............................................                        4,458,000               3,626,000
                                                                          ---------------         ---------------  
              Total assets..............................                  $   729,614,000         $   709,414,000
                                                                          ===============         ===============


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

Accrued and other liabilities..............................               $    14,050,000         $    15,953,000
Line of credit.............................................                             -              12,500,000
Note payable to affiliate..................................                    27,700,000                       -
Mortgage notes payable.....................................                    39,923,000              38,041,000
                                                                          ---------------         ---------------  
         Total liabilities.................................                    81,673,000              66,494,000

Minority interest..........................................                   154,858,000             153,015,000

Shareholders' equity:
   Preferred   Stock,   $0.01  par  value,   50,000,000   shares
     authorized,   none   outstanding  at  March  31,  1999  and
     December 31, 1998........................................                          -                       -
   Common   stock,   $0.01   par   value,   100,000,000   shares
     authorized,  23,637,410  shares issued and  outstanding  at
     March 31, 1999  (23,635,650  shares issued and  outstanding
     at December 31, 1998)....................................                    236,000                 236,000
   Paid-in capital.........................................                   482,116,000             482,471,000
   Cumulative net income...................................                    41,996,000              32,554,000
   Cumulative distributions................................                   (31,265,000)            (25,356,000)
                                                                          ---------------         ---------------
         Total shareholders' equity........................                   493,083,000             489,905,000
                                                                          ---------------         ---------------  
              Total liabilities and shareholders' equity...               $   729,614,000         $   709,414,000
                                                                          ===============         =============== 
</TABLE>

  
                             See accompanying notes.
                                        2


<PAGE>

                             PS BUSINESS PARKS, INC.
                   CONDENSED CONSOLIDATED STATEMENTS OF INCOME
                                   (Unaudited)
<TABLE>
<CAPTION>

                                                               For the three months
                                                                  ended March 31,
                                                        --------------------------------
                                                              1999              1998
                                                        --------------    --------------
<S>                                                     <C>               <C>

Revenues:
   Rental income.................................       $   29,117,000    $   14,353,000
   Facility management fees from affiliates......              114,000           202,000
   Interest income...............................               20,000           233,000
                                                        --------------    --------------
                                                            29,251,000        14,788,000
                                                        --------------    --------------

Expenses:
  Cost of operations.............................            8,376,000         4,627,000
  Cost of facility management....................               23,000            25,000
  Depreciation and amortization..................            6,733,000         2,300,000
  General and administrative.....................              802,000           445,000
   Interest expense..............................              909,000           247,000
                                                        --------------    --------------  
                                                            16,843,000         7,644,000
                                                        --------------    --------------  

Income before minority interest..................           12,408,000         7,144,000

  Minority interest in income....................           (2,966,000)       (2,814,000)
                                                        --------------    --------------  

Net income.......................................       $    9,442,000    $    4,330,000
                                                        ==============    ==============

Net income per share:
  Basic..........................................       $         0.40    $         0.38
                                                        ==============    ==============
  Diluted........................................       $         0.40    $         0.38
                                                        ==============    ==============

Weighted average shares outstanding:
  Basic..........................................           23,637,000        11,314,000
                                                        ==============    ==============
  Diluted........................................           23,705,000        11,357,000
                                                        ==============    ==============
</TABLE>

                            See accompanying notes.
                                       3

<PAGE>


                             PS BUSINESS PARKS, INC.
            CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY
                    For the three months ended March 31, 1999
                                   (Unaudited)

<TABLE>
<CAPTION>

                                                                                                                                    
                                                    Preferred Stock             Common Stock                                        
                                                   Shares     Amount       Shares         Amount      Paid-in Capital    Net Income 
                                                   ------     ------     ----------     -----------   ---------------   ------------
<S>                                                <C>        <C>        <C>            <C>            <C>                <C>

Balances at December 31, 1998.............            -       $   -      23,635,650     $   236,000    $  482,471,000   $ 32,554,000

   Issuance of common stock...............            -           -           1,760               -            40,000              -

   Net income.............................            -           -               -               -                 -      9,442,000

   Distributions paid.....................            -           -               -               -                 -              -

   Adjustment to reflect minority  interest to
     underlying ownership interest..........          -           -               -               -          (395,000)             -
                                                  --------    -------    ----------     -----------    ---------------  ------------

Balances at March 31, 1999................            -       $   -      23,637,410     $   236,000    $  482,116,000   $ 41,996,000
                                                  ========    =======    ==========     ===========    ===============  ============

</TABLE>
<TABLE>
<CAPTION>
                                                                            Total
                                                   Cumulative            Shareholders'
                                                  Distributions              Equity
                                                  -------------          ------------
<S>                                               <C>                    <C>

Balances at December 31, 1998                     $(25,356,000)          $489,905,000

    Issuance of common stock...............                  -                 40,000

    Net income.............................                  -              9,442,000

    Distributions paid.....................         (5,909,000             (5,909,000)

    Adjustment to reflect minority interest
      to underlying ownership interest.....                  -               (395,000)
                                                  ------------           ------------
Balances at March 31, 1999.................       $(31,265,000)          $493,083,000
                                                  ============           ============
</TABLE>

                             See accompanying notes.
                                       4
<PAGE>

                             PS BUSINESS PARKS, INC.
                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                   (Unaudited)

<TABLE>
<CAPTION>

                                                                               For the three months ended March 31,
                                                                             --------------------------------------
                                                                                   1999                   1998
                                                                             --------------         --------------
<S>                                                                          <C>                    <C>   
Cash flows from operating activities:
   Net income........................................................        $    9,442,000         $    4,330,000
   Adjustments  to  reconcile  net  income  to  net  cash  provided  by
     operating activities:
       Depreciation and amortization expense.........................             6,733,000              2,300,000
       Minority interest in income...................................             2,966,000              2,814,000
       Increase in other assets......................................              (832,000)              (521,000)
       Increase (decrease) in accrued and other liabilities..........            (1,900,000)               371,000
                                                                             --------------         --------------   
            Total adjustments........................................             6,967,000              4,964,000
                                                                             --------------         --------------

         Net cash provided by operating activities...................            16,409,000              9,294,000
                                                                             --------------         -------------- 
Cash flows from investing activities:
       Acquisition of real estate facilities.........................           (22,269,000)           (38,754,000)
       Acquisition cost of business combination......................                     -               (424,000)
       Capital improvements to real estate facilities................            (2,204,000)              (857,000)
       Construction in progress......................................            (3,877,000)                     -
                                                                             --------------         --------------   
         Net cash used in investing activities.......................           (28,350,000)           (40,035,000)
                                                                             --------------         -------------- 
               
Cash flows from financing activities:
       Borrowings from an affiliate..................................            41,200,000                      -
       Repayment of borrowings from an affiliate.....................           (13,500,000)            (3,500,000)
       Borrowings from line of credit................................            14,000,000                      -
       Repayment of borrowings from line of credit...................           (26,500,000)                     -
       Principal payments on mortgage notes payable..................              (305,000)                     -
       Net proceeds from the issuance of common stock................                40,000             48,251,000
       Distributions paid to shareholders............................            (5,909,000)            (4,079,000)
       Distributions paid to minority interests......................            (1,854,000)            (2,556,000)
                                                                             --------------         --------------

         Net cash provided by financing activities...................             7,172,000             38,116,000
                                                                             --------------         --------------

Net increase (decrease) in cash and cash equivalents.................            (4,769,000)             7,375,000

Cash and cash equivalents at the beginning of the period.............             6,068,000              3,884,000
                                                                             --------------         --------------

Cash and cash equivalents at the end of the period...................        $    1,299,000         $   11,259,000
                                                                             ==============         ============== 
</TABLE>


                            See accompanying notes.
                                       5

<PAGE>



                             PS BUSINESS PARKS, INC.
                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                   (Unaudited)

<TABLE>
<CAPTION>

                                                                               For the three months ended March 31,
                                                                             --------------------------------------
                                                                                   1999                   1998
                                                                             --------------         --------------
<S>                                                                          <C>                    <C>   
Supplemental schedule of non cash investing and financial activities:

Acquisitions of real estate  facilities and associated assets and
  liabilities in exchange for minority interests and mortgage notes
  payable:
     Real estate facilities........................................          $    (2,520,000)       $   (16,680,000)
     Other assets (deposits on real estate acquisitions)...........                        -                800,000
     Accrued and other liabilities.................................                        -                149,000
     Minority interest.............................................                  333,000              1,205,000
     Mortgage notes payable........................................                2,187,000             14,526,000

Business combination:
     Real estate facilities........................................                        -            (48,000,000)
     Other assets .................................................                        -               (452,000)
     Accrued and other liabilities.................................                        -              1,218,000
     Common stock..................................................                        -                 23,000
     Paid-in capital...............................................                        -             46,787,000

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

Adjustment to reflect minority interest to underlying ownership
interest:
     Minority interest.............................................                  395,000              3,799,000
     Paid-in capital...............................................                 (395,000)            (3,799,000)

Adjustment to acquisition cost (see Note 2):
     Real estate facilities........................................                        -             (1,315,000)
     Intangible assets.............................................                        -              1,315,000

</TABLE>


                            See accompanying notes.
                                       6


<PAGE>

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


1. Organization and description of business

   Organization

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

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

   Description of business

   PSB is a  fully-integrated,  self-managed real estate investment trust (REIT)
   that acquires,  owns, operates and develops commercial  properties containing
   commercial and industrial rental space. PSB is the sole general partner of PS
   Business Parks, L.P. (the "Operating  Partnerships)through  which the Company
   conducts most of its activities.  From 1986 through 1996, PSB's sole business
   activity consisted of the management of commercial properties owned primarily
   by Public Storage, Inc. (PSI) and affiliated entities.

   Commencing in 1997,  PSB began to own and operate  commercial  properties for
   its own  behalf.  At  March  31,  1999,  PSB and  the  Operating  Partnership
   collectively owned and operated 114 commercial properties (approximately 11.3
   million net rentable  square  feet)  located in 11 states.  In addition,  the
   Operating  Partnership managed, on behalf of PSI and affiliated entities,  36
   commercial properties (approximately 1.0 million net rentable square feet).

2. Summary of significant accounting policies

   Basis of presentation

   The accompanying  unaudited condensed  consolidated financial statements have
   been prepared in accordance with generally accepted accounting principles for
   interim financial  information and with instructions to Form 10-Q and Article
   10 of Regulation S-X. Accordingly, they do not include all of the information
   and  footnotes  required by  generally  accepted  accounting  principles  for
   complete financial statements.  The preparation of the condensed consolidated
   financial   statements  in  conformity  with  generally  accepted  accounting
   principles  requires management to make estimates and assumptions that affect
   the amounts reported in the condensed  consolidated  financial statements and
   accompanying  notes.  Actual  results  could  differ from  estimates.  In the
   opinion  of  management,  all  adjustments  (consisting  of normal  recurring
   accruals)  necessary for a fair  presentation  have been included.  Operating
   results  for the  three  months  ended  March  31,  1999 are not  necessarily
   indicative  of the results that may be expected  for the year ended  December
   31,  1999.  For  further  information,  refer to the  consolidated  financial
   statements and footnotes thereto included in PSB's annual report on Form 10-K
   for the year ended December 31, 1998.

   The condensed  consolidated  financial statements include the accounts of PSB
   and the Operating Partnership. At March 31, 1999, PSB owned approximately 73%
   of the OP units  of the  Operating  Partnership.  PSB,  as the  sole  general
   partner  of the  Operating  Partnership,  has full,  exclusive  and  complete
   responsibility  and  discretion  in managing and  controlling  the  Operating
   Partnership. Historical financial data of PSP11 have not been included in the
   historical financial statements of PSB.

                                       7
 <PAGE>
                             PS BUSINESS PARKS, INC.
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                                 March 31, 1999


   Cash and cash equivalents

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

   Real estate facilities

   Costs related to the improvements of properties are capitalized. Expenditures
   for repair and  maintenance  are charged to expense when incurred.  Buildings
   and equipment are depreciated on the straight-line  method over the estimated
   useful lives, which are generally 30 and 5 years, respectively.

   Interest  cost  incurred  during the period of  construction  of real  estate
   facilities is  capitalized.  Construction in progress  includes  $453,000 and
   $268,000 of  capitalized  interest  costs at March 31, 1999 and  December 31,
   1998, respectively.  The Company capitalized $185,000 during the three months
   ended March 31,  1999.  No interest was  capitalized  during the three months
   ended March 31, 1998.

   Intangible assets

   Intangible  assets  consist of property  management  contracts for properties
   managed,  but not owned,  by PSB. The intangible  assets are being  amortized
   over seven years. As properties  managed have been  subsequently  acquired by
   PSB, the unamortized  basis of intangible  assets related to such property is
   included in the cost of acquisition of such property.  In connection with the
   Merger,  PSB  acquired  13  properties  and  included  in the  cost  of  such
   properties  is  $1,315,000  (which  was net of  accumulated  amortization  of
   $194,000) of costs  previously  classified as intangible  assets.  Intangible
   assets are net of accumulated  amortization of $648,000 and $573,000 at March
   31, 1999 and December 31, 1998, respectively.

   Evaluation of asset impairment

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

   Note payable to affiliate

   Note payable to affiliate at March 31, 1999  reflects  amounts  borrowed from
   PSI on that date.  The note bore  interest at 5.5% (per annum).  The note was
   repaid as of April 30, 1999.

   Revenue and expense recognition

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

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

   Property  management  fees are recognized in the period  earned.

   General  and  administrative   expense

   General and administrative  expense includes executive  compensation,  office
   expense, professional fees, state income taxes, cost of acquisition personnel
   
                                       8

<PAGE>
                             PS BUSINESS PARKS, INC.
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                                 March 31, 1999


   and other such administrative items. Such amounts include amounts incurred by
   PSI on behalf of PSB,  which were  subsequently  charged to PSB in accordance
   with  the  allocation   methodology  pursuant  to  the  cost  allocation  and
   administrative service agreement between PSB and PSI.

   Acquisition costs

   Internal  acquisition  costs are  expensed as  incurred.

   Income taxes

   During  1997,  PSB  qualified  and  intends to  continue to qualify as a real
   estate  investment  trust  (REIT),  as defined in Section 856 of the Internal
   Revenue  Code.  As a REIT,  PSB is not  subject to federal  income tax to the
   extent  that  it  distributes  at  least  95% of its  taxable  income  to its
   shareholders.  In addition,  REITs are subject to a number of  organizational
   and operating requirements.  If the Company fails to qualify as a REIT in any
   taxable year,  the Company will be subject to federal  income tax  (including
   any  applicable  alternative  minimum tax) based on its taxable  income using
   corporate income tax rates.  Even if the Company  qualifies for taxation as a
   REIT,  the  Company  may be subject to certain  state and local  taxes on its
   income  and  property  and  to  federal   income  and  excise  taxes  on  its
   undistributed  taxable income.  The Company  believes it met all organization
   and  operating  requirements  to  maintain  its REIT  status  during 1998 and
   intends to  continue  to meet such  requirements  for 1999.  Accordingly,  no
   provision  for  income  taxes  has been  made in the  accompanying  financial
   statements.

   Net income per common share

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

<TABLE>
<CAPTION>

                                                                                        Three Months Ended
                                                                                             March 31,
                                                                                    ----------------------------
                                                                                        1999             1998
                                                                                    ------------    ------------
<S>                                                                                 <C>             <C>   
     Net income and net income allocable to common  shareholders  (same for
        Basic and Diluted computations)...................................          $  9,442,000    $  4,330,000
                                                                                    ============    ============

     Weighted average common shares outstanding:

        Basic weighted average common shares outstanding..................            23,637,000      11,314,000
        Net effect of  dilutive  stock  options - based on  treasury  stock
          method using average market price...............................                68,000          43,000
                                                                                    ------------    ------------

        Diluted weighted average common shares outstanding................            23,705,000      11,357,000
                                                                                    ============    ============

     Basic earnings per common share......................................          $       0.40    $       0.38
                                                                                    ============    ============
     Diluted earnings per common share....................................          $       0.40    $       0.38
                                                                                    ============    ============
</TABLE>


                                       9
<PAGE>

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


   Comprehensive Income

   Effective January 1, 1998, PSB adopted SFAS No. 130, REPORTING  COMPREHENSIVE
   INCOME.  SFAS No. 130 requires a separate  statement to report the components
   of comprehensive  income for each period  reported.  The adoption of SFAS No.
   130 did not have an impact on PSB's reporting presentation.

   Segment Reporting

   Effective  January 1, 1998,  PSB  adopted  SFAS No.  131,  DISCLOSURES  ABOUT
   SEGMENTS OF AN ENTERPRISE AND RELATED  INFORMATION.  SFAS No. 131 established
   standards for the way public business  enterprises  report  information about
   operating  segments in annual  financial  statements  and requires that those
   enterprises  report selected  information about operating segments in interim
   financial   reports.   SFAS  131  also  establishes   standards  for  related
   disclosures  about  products  and  services,   geographic  areas,  and  major
   customers.  As management  views the Company as operating in a single segment
   as  described  in Note 1, the  adoption of SFAS No. 131 did not affect  PSB's
   disclosure of segment information.

   Reclassifications

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

3. Business combination

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

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

         *  Each share of PSP11  common  stock  Series B and each share of PSP11
            common  stock  Series C converted  into .8641 shares 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 each group
            of real estate facilities was approximately $48 million.

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

                                       10
<PAGE>

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


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

<TABLE>
<CAPTION>
               Acquisition cost:
               -----------------
               <S>                                          <C> 
               Issuance of common stock.........            $46,810,000
               Cash.............................                424,000
                                                            -----------
                   Total acquisition cost.......            $47,234,000
                                                            ===========
</TABLE>
<TABLE>
<CAPTION>

               Allocation of acquisition cost:
               -------------------------------
               <S>                                          <C> 
               Real estate facilities...........            $48,000,000
               Other assets.....................                452,000
               Accrued and other liabilities....             (1,218,000)
                                                            -----------
                   Total allocation.............            $47,234,000
                                                            ===========
</TABLE>

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

<TABLE>
<CAPTION>

                                                                                     Three months ended
                                                                                        March 31, 1998
                                                                                     -------------------
<S>                                                                                       <C>
     Revenues......................................................                       $16,666,000
     Net income....................................................                       $ 5,115,000
     Net income per share - basic..................................                       $      0.39
     Net income per share - diluted................................                       $      0.39

</TABLE>

   The pro forma data does not purport to be indicative either of the results of
   operations  that would have occurred had the Merger occurred at the beginning
   of fiscal 1998 or of the future results of PSB.

                                       11
<PAGE>

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

4. Real estate facilities

   The activity in real estate  facilities  for the three months ended March 31,
   1999 is as follows:
<TABLE>
<CAPTION>

                                                                                 Accumulated
                                                Land            Buildings        Depreciation          Total
                                           ---------------   ---------------    ---------------   --------------- 
<S>                                        <C>               <C>                <C>               <C>            

     Balances at December 31, 1998......   $   176,241,000   $   536,697,000    $   (22,517,000)  $   690,421,000
     Property acquisitions..............         4,004,000        20,785,000                  -        24,789,000
     Capital improvements...............                 -         2,204,000                  -         2,204,000
     Depreciation expense...............                 -                 -         (6,658,000)       (6,658,000)
                                           ---------------   ---------------    ---------------   ---------------
     Balances at March 31, 1999.........   $   180,245,000   $   559,686,000    $   (29,175,000)  $   710,756,000
                                           ===============   ===============    ===============   =============== 
</TABLE>
 
5. Leasing activity

   The Company  leases  space in its real  estate  facilities  to tenants  under
   non-cancelable  leases  generally  ranging  from one to seven  years.  Future
   minimum rental revenues  excluding  recovery of expenses as of March 31, 1999
   under these leases are as follows:
<TABLE>
<S>                                                                       <C>
                              1999 (April - December).............        $   69,398,000
                              2000................................            69,848,000
                              2001................................            47,851,000
                              2002................................            30,913,000
                              2003................................            19,121,000
                              Thereafter..........................            26,721,000
                                                                          --------------
                                                                          $  263,852,000
                                                                          ==============
</TABLE>
   In addition to minimum rental payments,  tenants pay reimbursements for their
   pro rata share of specified  operating  expenses,  which amount to $3,441,000
   and  $1,359,000  for  the  three  months  ended  March  31,  1999  and  1998,
   respectively.  These  amounts  are  included  as  rental  income  and cost of
   operations in the accompanying condensed  consolidated  statements of income.

6. Revolving line of credit

   The Company has an  unsecured  line of credit (the  "Credit  Facility")  with
   Wells Fargo Bank. The Credit  Facility has a borrowing  limit of $100 million
   and an expiration date of August 5, 2000. The expiration date may be extended
   by  one  year  on  each  anniversary  of the  Credit  Facility.  Interest  on
   outstanding  borrowings is payable monthly. At the option of the Company, the
   rate of  interest  charged  is  equal  to (i) the  prime  rate or (ii) a rate
   ranging from the London Interbank  Offered Rate ("LIBOR") plus 0.55% to LIBOR
   plus 0.95% depending on the Company's credit ratings and coverage ratios,  as
   defined (currently LIBOR plus 0.80%). In addition, the Company is required to
   pay an annual commitment fee of 0.25%.

   Under  covenants  of the Credit  Facility,  the  Company is  required  to (i)
   maintain a balance  sheet  leverage  ratio (as  defined) of less than 0.50 to
   1.00, (ii) maintain interest and fixed charge coverage ratios (as defined) of
   not less  than 2.25 to 1.0 and 2.0 to 1.0,  respectively,  (iii)  maintain  a
   minimum total shareholders'  equity (as defined) and (iv) limit distributions
   
                                       12
<PAGE>

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


   to 95% of funds from operations.  In addition,  the Company is limited in its
   ability to incur  additional  borrowings (the Company is required to maintain
   unencumbered assets with an aggregate book value equal to or greater than two
   times the Company's  unsecured recourse debt) or sell assets. The Company was
   in compliance with the covenants of the Credit Facility at March 31, 1999.

7. Mortgage notes payable

   Mortgage notes at March 31, 1999 consist of the following:

<TABLE>
<S>                                                                                    <C>                                          
             7.625%  mortgage  note,  secured by one  commercial  property with an
                  approximate  carrying  amount  of  $21,507,000,   principal  and
                  interest payable monthly, repaid May 14, 1999...................     $11,236,000
             7.125%  mortgage  note,  secured by one  commercial  property with an
                  approximate  carrying  amount  of  $19,794,000,   principal  and
                  interest payable monthly, due May 2006..........................       8,877,000
             8.4%  mortgage  note,  secured  by  six  commercial  properties  with
                  approximate  carrying  amounts totaling  $21,014,000,  principal
                  and interest payable monthly, due November 2001.................       8,634,000
             8.125%  mortgage  note,  secured by one  commercial  property with an
                  approximate  carrying  amount  of  $12,557,000,   principal  and
                  interest payable monthly, due July 2005.........................       5,400,000
             8%  mortgage  note,  secured  by  one  commercial  property  with  an
                  approximate   carrying  amount  of  $5,753,000,   principal  and
                  interest payable monthly, due April 2003........................       2,168,000
             8.5%  mortgage  note,  secured  by one  commercial  property  with an
                  approximate   carrying  amount  of  $3,701,000,   principal  and
                  interest payable monthly, due July 2007.........................       1,932,000
             8%  mortgage  note,  secured  by  one  commercial  property  with  an
                  approximate   carrying  amount  of  $3,576,000,   principal  and
                  interest payable monthly, due April 2003........................       1,676,000
                                                                                       -----------   
                                                                                       $39,923,000
                                                                                       ===========
</TABLE>
  
   At March 31, 1999, approximate principal maturities of mortgage notes payable
   are as follows:

<TABLE>
<S>                                                                        <C>
                              1999 (April - December).............         $   11,675,000
                              2000................................                643,000
                              2001................................              8,846,000
                              2002................................                549,000
                              2003................................              3,735,000
                              Thereafter..........................             14,475,000
                                                                           --------------
                                                                           $   39,923,000
                                                                           ==============
</TABLE>

   
                                       13
<PAGE>

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


8. Minority interests

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

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

   A limited partner that exercises its redemption  right will receive cash from
   the Operating  Partnership in an amount equal to the market value (as defined
   in  the  Operating  Partnership   Agreement)  of  the  partnership  interests
   redeemed.  In lieu of the  Operating  Partnership  redeeming  the partner for
   cash,  PSB,  as  general  partner,  has the  right to elect  to  acquire  the
   partnership   interest  directly  from  a  limited  partner   exercising  its

   redemption  right,  in exchange for cash in the amount  specified above or by
   issuance  of one  share  of  PSB  common  stock  for  each  unit  of  limited
   partnership interest redeemed.

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

   At March 31, 1999, there were 7,414,620 OP units owned by minority  interests
   (7,305,355  were owned by PSI and affiliated  entities and 109,265 were owned
   by unaffiliated  third parties).  On a fully  converted  basis,  assuming all
   7,414,620  minority  interest OP units were  converted  into shares of common
   stock  of  PSB  at  March  31,  1999,  the  minority   interests   would  own
   approximately  23.9% of the  common  shares  outstanding.  At the end of each
   reporting  period,  PSB  determines  the amount of equity  (book value of net
   assets) which is allocable to the minority  interest based upon the ownership
   interest  and  an  adjustment  is  made  to  the  minority  interest,  with a
   corresponding   adjustment  to  paid-in  capital,  to  reflect  the  minority
   interests' equity in the Company.

   See Note 13 for  disclosure  of  subsequent  issuance of Preferred  Operating
   Partnership Units.

9. Property management contracts

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

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

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

                                       14
<PAGE>

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


10.Shareholders' equity

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

   On  March  31,  1999,  PSB  paid  a  quarterly  distribution  to  its  common
   shareholders totaling $5,909,000 or $0.25 per common share.

   See Note 13 for disclosure of subsequent issuance of preferred stock.

11.Recent accounting pronouncements


   In June 1998, the Financial  Accounting  Standards Board issued SFAS No. 133,
   "Accounting  for Derivative  Instruments  and Hedging  Activities,"  which is
   required to be adopted in years  beginning  after June 15,  1999.  Management
   anticipates that the adoption of SFAS No. 133 will have no effect on earnings
   or the financial  position of PSB since no  derivatives  are currently  being
   used.

12.Commitments and contingencies

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

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

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

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

   
                                       15


<PAGE>

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


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

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

13.Subsequent events

   In April 1999,  the Company  completed a private  placement  of  preferred OP
   units and a public  offering of  depositary  shares  representing  fractional
   interests in perpetual  preferred  stock  resulting in net proceeds  totaling
   $65.7  million.  The net proceeds  from the  placement of preferred OP units,
   completed April 23, 1999 were  approximately  $12.5 million and the preferred
   OP units have a preferred  distribution  rate of 8 7/8% on a stated  value of
   $12.75  million.  The  preferred OP units have  equivalent  terms to those of
   perpetual  preferred stock. Net proceeds from the public perpetual  preferred
   stock offering completed April 30, 1999 were $53.2 million, and the preferred
   stock  has a  dividend  rate  of 9 1/4% on a  stated  value  of $55  million.
   Proceeds from the issuances were used to repay  borrowings  from an affiliate
   and a mortgage  note  payable of  approximately  $11 million.  The  remaining
   proceeds will be used for investment in real estate.

                                       16
<PAGE>

Management's  Discussion  and Analysis of Financial  Condition and Results of
- -----------------------------------------------------------------------------
Operations
- ----------

         General:   Private   Securities   Litigation  Reform  Act  Safe  Harbor
Statement.  In addition to historical  information,  management's discussion and
analysis  includes  certain  forward-looking  statements  regarding  events  and
financial  trends which may affect the Company's  future  operating  results and
financial position. Such forward-looking  statements are often identified by the
words "estimate,"  "project,"  "intend," "plan," "expect," "believe," or similar
expressions.  Such statements are subject to risks and uncertainties  that could
cause the Company's actual results and financial  position to differ  materially
from that indicated by the forward-looking  statement. Such factors include, but
are not limited to a change in economic conditions in the various markets served
by the Company's operations which would adversely affect the level of demand for
rental of commercial  space and the cost  structure of the Company.  Readers are
cautioned not to place undue reliance on these forward-looking statements, which
speak only as of the date  hereof.  The  Company  undertakes  no  obligation  to
publicly release the result of any revisions to these forward-looking statements
to reflect  events or  circumstances  after the date  hereof or to  reflect  the
occurrence of unanticipated events.

         Overview: Comparisons between the three months ended March 31, 1999 and
1998 will reflect  significant  level of acquisitions  during 1998 and the first
three months of 1999.

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

         The Company  acquired  approximately  338,000 square feet of commercial
space at an aggregate cost of approximately $24 million during the first quarter
of 1999.  These  acquisitions  increased  the  Company's  presence  in  existing
markets, which the Company believes have characteristics necessary for long-term
growth. These acquisitions were comprised of 230,000 square feet adjacent to the
Company's  existing  park in Austin,  Texas and 108,000  square feet in Northern
Virginia  and a 9.2 acre parcel of land in Northern  Virginia  which the Company
may develop into a 136,000 square feet flex building.

         Net income for the three  months  ended March 31,  1999 was  $9,442,000
compared to $4,330,000  for the same period in 1998. Net income per common share
on a  diluted  basis  was  $0.40  (based  on  weighted  average  diluted  shares
outstanding of 23,705,000) for the three months ended March 31, 1999 compared to
net  income  per  common  share on a diluted  basis of $0.38  (based on  diluted
weighted average shares  outstanding of 11,357,000) for the same period in 1998,
representing an increase of 5.3%. The increases in net income and net income per
share  reflects  PSB's  significant   growth  in  its  asset  base  through  the
acquisition of commercial  properties and increase in net operating  income from
the consistent group of properties.

                                       17
<PAGE>

         Results of Operations:  The Company's  property  operations account for
almost all of the net  operating  income  earned by the Company.  The  following
table presents the pre-depreciation  operating results of the properties for the
three months ended March 31, 1999 and 1998:
<TABLE>
<CAPTION>

                                                                  Three Months Ended March 31,
                                                                  ----------------------------    
                                                                       1999              1998            Change
                                                                  -------------      ------------      ---------  
<S>                                                                 <C>               <C>               <C>
Rental income:
Facilities  owned  throughout each period (50 facilities,  6.4
     million net rentable square feet)......................        $15,233,000       $13,787,000          10.5%
Facilities   acquired   subsequent   to   January   1998   (64
     facilities, 4.9 million net rentable square feet)......         13,884,000           566,000       2,353.0%
                                                                    -----------       -----------       -------- 
Total rental income.........................................        $29,117,000       $14,353,000         102.9%
                                                                    ===========       ===========       ========

Cost of operations (excluding depreciation):
Facilities owned throughout each period.....................         $4,542,000        $4,444,000           2.2%
Facilities acquired subsequent to January 1998..............          3,834,000           183,000       1,995.1%
                                                                    -----------       -----------       --------
Total cost of operations....................................         $8,376,000         4,627,000          81.0%
                                                                    ===========       ===========       ========

Net operating income (rental income less cost of operations):
Facilities owned throughout each period.....................        $10,691,000        $9,343,000          14.4%
Facilities acquired subsequent to January 1998..............         10,050,000           383,000       2,524.0%
                                                                    -----------        ----------       --------
Total net operating income..................................        $20,741,000        $9,726,000         113.3%
                                                                    ===========        ==========       ========
   
</TABLE>

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

<TABLE>
<CAPTION>

                                    Square       Percent         Rental         Percent                        Percent
          Region                   Footage      of Total         Income         of Total          NOI         of Total
- ----------------------------     ----------     --------       -----------      --------     ----------       --------  
<S>                              <C>              <C>          <C>              <C>          <C>                <C>

Southern California               3,085,000        27.4%        $7,904,000        27.1%      $5,898,000          28.4%
Northern California               1,105,000         9.8%         3,270,000        11.2%       2,038,000           9.8%
Virginia                          1,316,000        11.7%         3,943,000        13.5%       2,850,000          13.7%
Maryland                          1,107,000         9.8%         3,270,000        11.2%       2,378,000          11.5%
Texas                             2,721,000        24.1%         5,758,000        19.8%       3,812,000          18.4%
Oregon                            1,102,000         9.8%         3,349,000        11.5%       2,717,000          13.1%
Other                               833,000         7.4%         1,623,000         5.6%       1,048,000           5.1%
                                 ----------       ------       -----------       ------     -----------         ------       
Total                            11,269,000       100.0%       $29,117,000       100.0%     $20,741,000         100.0%
                                 ==========       ======       ===========       ======     ===========         ======
</TABLE>

         Supplemental  Property  Data  and  Trends:  In order  to  evaluate  the
performance  of  the  Company's  overall  portfolio,   management  analyzes  the
operating  performance of a consistent  group of 62 properties  (7.2 million net
rentable square feet). These 62 properties in which the Company currently has an
ownership  interest (herein referred to as the "Same Park" facilities) have been
managed by the Company since January 1998.  The following  table  summarizes the
pre-depreciation  historical  operating  results of the "Same  Park"  facilities
excluding  the effects of  accounting  for rental  revenues  on a  straight-line
basis. Beginning with this quarter, the Company has added 11 properties operated
throughout  1998 totaling  approximately  three million square feet to its "Same
Park"  facilities.  These  additional  properties  have  been  operated  for the
comparable  periods  and  will  provide  a more  comprehensive  analysis  of the
portfolio's  operations.  The "Same Park" facilities now represent approximately
64% of the  square  footage  of the  Company's  portfolio  at  March  31,  1999.

                                       18
<PAGE>
<TABLE>
<CAPTION>
                                                                           Three months ended March 31,
                                                                ----------------------------------------------- 
                                                                    1999             1998 (1)           Change
                                                                -----------        -----------          ------ 
<S>                                                             <C>                <C>                   <C>
Rental income (2)......................................         $17,489,000        $16,174,000            8.1%
Cost of operations.....................................           5,378,000          5,236,000            2.7%
                                                                -----------        -----------           -----   
  Net operating income.................................         $12,111,000        $10,938,000           10.7%
                                                                ===========        ===========           =====   
    Gross margin (3)...................................               69.2%              67.6%            1.6%

Annualized realized rent per occupied square foot (4)..              $10.10              $9.56            5.6%

Weighted average occupancy for the period..............               96.4%              94.1%            2.3%

</TABLE>

(1)   Operations  for the three  months  ended  March  31,  1998  represent  the
      historical  operations of the 62 properties;  however, the Company did not
      own all of the properties  throughout all periods  presented and therefore
      such  operations are not reflected in the Company's  historical  operating
      results.  All such  properties  were owned  effective  March 17, 1998.
(2)   Rental  income does not include  the effect of straight  line  accounting.
(3)   Gross  margin is computed by dividing  property  net  operating  income by
      rental  income.
(4)   Realized rent per square foot  represents  the actual  revenue  earned per
      occupied square foot.

      The following tables summarize the "Same Park" operating  results by major
 geographic region for the three months ended March 31, 1999 and 1998:

<TABLE>
<CAPTION>
                                  Revenues           Revenues     Percent            NOI               NOI          Percent
                                    1999               1998      Increase            1999             1998         Increase
                                ------------       -----------   --------         -----------      -----------     --------    
<S>                              <C>               <C>              <C>           <C>              <C>               <C>
Southern California               $7,702,000        $6,988,000      10.2%          $5,630,000       $4,866,000       15.7%
Northern California                1,986,000         1,821,000       9.1%           1,457,000        1,380,000        5.6%
Texas                              1,732,000         1,593,000       8.7%             944,000          786,000       20.1%
Virginia                           2,228,000         2,108,000       5.7%           1,489,000        1,383,000        7.7%
Maryland                           2,259,000         2,116,000       6.8%           1,590,000        1,545,000        2.9%
Arizona                              694,000           665,000       4.4%             453,000          431,000        5.1%
Other                                888,000           883,000       0.6%             548,000          547,000        0.2%
                                 -----------       -----------      -----         -----------      -----------       -----          
Total                            $17,489,000       $16,174,000       8.1%         $12,111,000      $10,938,000       10.7%
                                 ===========       ===========      =====         ===========      ===========       =====         
</TABLE>

          There was tremendous  growth in the strong Southern  California market
 accentuated by rising  occupancies in the New York Common portfolio acquired in
 December  1997 which rose from 90.1% in the first  quarter of 1998 to 98.9% for
 the same period in 1999. Texas benefited from increased occupancy at the Austin
 facility  in addition  to  economies  of scale  created by  substantial  square
 footage added to the Texas market over the last twelve months.

          Facility  Management  Operations:  The Company's  facility  management
 accounts for a small portion of the Company's net operating income.  During the
 three  months  ended  March 31,  1999,  $91,000  in net  operating  income  was
 recognized  from facility  management  operations  compared to $177,000 for the
 same  period  in 1998.  Facility  management  fees  have  decreased  due to the
 Company's acquisition of properties previously managed.

          Interest Income:  Interest income reflects  earnings on cash balances.
 Interest  income was $20,000 for the three months ended March 31, 1999 compared
 to  $233,000  for the same period in 1998.  The  decrease  is  attributable  to
 decreased  average cash  balances.  Average cash  balances for the three months
 ended March 31, 1999 were  approximately $1.6 million compared to $18.6 million
 for the same period in 1998.

          Cost of  Operations:  Cost of  operations  for the three  months ended
 March 31, 1999 was  $8,376,000  compared to  $4,627,000  for the same period in
 1998.  The increase is due primarily to the growth in the total square  footage
 of the Company's portfolio of properties. Cost of operations as a percentage or

                                       19
<PAGE>


 rental income  decreased  from 32.2% to 28.8% as a result of economies of scale
 achieved  through the  acquisition of properties in existing  markets.  Cost of
 operations  for the three  months  ended March 31, 1999  consists  primarily of
 property  taxes  ($2,601,000),  property  maintenance  ($1,255,000),  utilities
 ($1,190,000) and direct payroll ($1,088,000).

          Depreciation and Amortization  Expense:  Depreciation and amortization
 expense for the three  months ended March 31, 1999 was  $6,733,000  compared to
 $2,300,000 for the same period in 1998. The increase is due to the  acquisition
 of real estate facilities in 1998 and 1999.

          General and Administrative Expense: General and administrative expense
 was $802,000 for the three months ended March 31, 1999 compared to $445,000 for
 the  same  period  in  1998.  The  increase  is due to the  increased  size and
 acquisition  activities of the Company.  Included in general and administrative
 costs  are  acquisition  costs and  abandoned  transaction  costs.  Acquisition
 expenses  for the three  months  ended March 31, 1999 and 1998 were $90,000 and
 $82,000,  respectively.  Abandoned  transaction costs were $2,000 for the three
 months ended March 31, 1999 and none for the three months ended March 31, 1998.

          Interest  Expense:  Interest expense was $909,000 for the three months
 ended March 31, 1999  compared  to  $247,000  for the same period in 1998.  The
 increase is  attributable  to mortgage  notes  assumed in  connection  with the
 acquisition  of real  estate  facilities  ($693,000  in interest  expense)  and
 temporary financing in connection with acquisitions  ($401,000) net of $185,000
 of interest expense capitalized to ongoing construction projects.

          Minority Interest in Income:  Minority interest in income reflects the
 income allocable to equity interests in the Operating Partnership which are not
 owned by the  Company.  Minority  interest in income for the three months ended
 March 31, 1999 was  $2,966,000  compared to  $2,814,000  for the same period in
 1998. The increase in minority interest in income is due to improved  operating
 results  and  the  issuance  of  additional  Operating   Partnership  units  in
 connection with the acquisition of real estate facilities.

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

          Net cash provided by operating  activities  for the three months ended
 March  31,  1999  and  1998  was  $16,409,000  and  $9,294,000,   respectively.
 Management believes that the Company's  internally  generated net cash provided
 by operating activities will continue to be sufficient to enable it to meet its
 operating  expenses,  capital  improvements,   debt  service  requirements  and
 maintain the current level of distribution to shareholders.

          The following table  summarizes the Company's  ability to make capital
 improvements  to maintain its  facilities  through the use of cash  provided by
 operating  activities.  The remaining  cash flow is available to the Company to
 pay distributions to shareholders and acquire property interests.

<TABLE>
<CAPTION>

                                                                            Three months ended March 31,
                                                                           -----------------------------
                                                                                1999             1998
                                                                           ------------      ----------- 
<S>                                                                        <C>               <C> 
Net income..........................................................       $  9,442,000      $ 4,330,000
Depreciation and amortization.......................................          6,733,000        2,300,000
Change in working capital...........................................         (2,732,000)        (150,000)
Minority interest in income.........................................          2,966,000        2,814,000
                                                                           ------------      -----------
Net cash provided by operating activities...........................         16,409,000        9,294,000
Maintenance capital expenditures....................................           (209,000)        (247,000)
Tenant improvements.................................................         (1,234,000)        (333,000)
Capitalized lease commissions.......................................           (517,000)        (277,000)
                                                                           ------------      ----------- 
Funds available for distributions to shareholders, minority interests,
  acquisitions and other corporate purposes.........................         14,449,000        8,437,000
Cash distributions to shareholders and minority interests...........         (7,763,000)      (6,635,000)
                                                                           ------------      -----------  
Excess funds available for acquisitions and other corporate purposes       $  6,686,000      $ 1,802,000
                                                                           ============      ===========   
</TABLE>
          The Company's  capital  structure is  characterized  by a low level of
 leverage. As of March 31, 1999, the Company had seven fixed rate mortgage notes

                                       20
<PAGE>

 payable  totaling  $39,923,000  and  $27,700,000 in borrowings  from PSI, which
 represented 9.5% of its total  capitalization  (based on book value,  including
 minority  interests  and debt).  The  weighted  average  interest  rate for the
 mortgage notes is 7.83%. Borrowings from PSI bear interest at 5.5%.

          On August 6, 1998,  The  Company  entered  into an  unsecured  line of
 credit (the "Credit Agreement") with Wells Fargo Bank. The Credit Agreement has
 a borrowing limit of $100 million and an expiration date of August 5, 2000. The
 expiration  date may be extended by one year on each  anniversary of the Credit
 Agreement. Interest on outstanding borrowings is payable monthly. At the option
 of the Company,  the rate of interest charged is equal to (i) the prime rate or
 (ii) a rate ranging from the London Interbank Offered Rate ("LIBOR") plus 0.55%
 to LIBOR plus 0.95%  depending  on the  Company's  credit  ratings and interest
 coverage  ratios,  as defined  (currently LIBOR plus 0.80%).  In addition,  the
 Company is required to pay an annual commitment fee of 0.25%.

          The  Company  expects to fund its  growth  strategies  with  permanent
 capital,  including  issuances  of common and  preferred  stock and  internally
 generated  retained  cash flows.  The Company  may  finance  acquisitions  on a
 temporary basis with borrowings from its line of credit. The Company intends to
 repay amounts borrowed under the credit facility from  undistributed  cash flow
 or, as market conditions permit and as determined to be advantageous,  from the
 public or private placement of preferred and common stock or formation of joint
 ventures.  The  Company  targets  a  leverage  ratio  of 40% and a FFO to fixed
 charges ratio of 3.0 to 1.0. As of March 31, 1999 and for the three months then
 ended,  the leverage  ratio was 8.9% and the Funds from  Operations  ("FFO") to
 fixed charges coverage ratio was 17.6 to 1.0.

          In April 1999, the Company  completed a private placement of preferred
 OP units and a public  offering of depositary  shares  representing  fractional
 interests in perpetual preferred stock resulting in net proceeds totaling $65.7
 million.  The net proceeds from the placement of preferred OP units,  completed
 April 23, 1999 were approximately $12.5 million and the preferred OP units have
 a preferred  distribution  rate of 8 7/8% on a stated value of $12.75  million.
 The preferred OP units have  equivalent  terms to those of perpetual  preferred
 stock.  Net  proceeds  from  the  public  perpetual  preferred  stock  offering
 completed  April 30, 1999 were $53.2  million,  and the  preferred  stock has a
 dividend  rate of 9 1/4% on a stated  value of $55 million.  Proceeds  from the
 issuances were used to repay  borrowings  from an affiliate and a mortgage note
 payable of approximately $11 million.  The remaining  proceeds will be used for
 investment in real estate.

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

         FFO for the Company is computed as follows:
<TABLE>
<CAPTION>

                                                                            Three months ended March 31,
                                                                           ------------------------------
                                                                               1999              1998
                                                                           -------------     ------------  
<S>                                                                        <C>               <C>   
Net income.........................................................        $  9,442,000      $  4,330,000
  Minority interest in income......................................           2,966,000         2,814,000
  Depreciation and amortization....................................           6,733,000         2,300,000
  Less effects of straight-line rents..............................            (751,000)                -
                                                                           ------------      ------------  
  Subtotal.........................................................          18,390,000         9,444,000
FFO allocated to minority interests................................          (4,404,000)       (3,765,000)
                                                                           ------------      ------------  
FFO allocated to shareholders......................................        $ 13,986,000      $  5,679,000
                                                                           ============      ============ 
</TABLE>
 

                                       21
<PAGE>

          Capital  Expenditures:  During the first quarter of 1999,  the Company
 incurred $2.0 million in maintenance capital expenditures,  tenant improvements
 and capitalized lease commissions.  In addition,  the Company made $0.2 million
 of renovation  expenditures.  On a recurring  annual basis, the Company expects
 $0.90 to $1.20 per square foot in recurring capital expenditures and during the
 remainder of 1999 expects to make $2.8 million in  additional  expenditures  to
 continue renovation on two properties in Texas.

          Distributions:  The  Company  has  elected and intends to qualify as a
 REIT for federal income tax purposes.  As a REIT, the Company must meet,  among
 other tests,  sources of income,  share  ownership and certain asset tests.  In
 addition,  the Company 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.

          The Board of  Directors  declared a  quarterly  dividend  of $0.25 per
 common  share  on May 10,  1999.  The  Board of  Directors  has  established  a
 distribution  policy to maximize the retention of cash flow and only distribute
 the minimum  amount  required  for the Company to maintain  its tax status as a
 REIT.  In  addition,  the Board of  Directors  declared a prorated  dividend of
 $0.39184 per share on the 2,200,000  depositary shares each representing 1/1000
 of a share of 9 1/4% Cumulative  Preferred Stock,  Series A.  Distributions are
 payable on June 30, 1999 to  shareholders of record as of the close of business
 on June 15, 1999.


                                       22

<PAGE>

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

          The Company  utilizes PSI's  information  systems in connection with a
 cost sharing and administrative  services  agreement.  The Company and PSI have
 completed  an  assessment  of all of its  hardware  and  software  applications
 including  those  affecting the Company to identify  susceptibility  to what is
 commonly  referred to as the "Y2K Issue" whereby certain computer programs have
 been using two digits rather than four to define the applicable  year.  Certain
 computer   programs  or  hardware  with  the  Y2K  Issue  have   date-sensitive
 applications or embedded chips that may recognize a date using "00" as the year
 1900 rather than the year 2000,  resulting in miscalculations or system failure
 causing disruptions to operations.

          The Company in conjunction with PSI has an  implementation  in process
 for critical  applications,  including its general ledger and related  systems,
 that  are  believed  to  have  Y2K  issues.  PSI  and the  Company  expect  the
 implementation  to be  complete  by June  1999.  Contingency  plans  have  been
 developed  for use in case the  implementations  are not  completed on a timely
 basis. The Company  presently  believes that the impact of the Y2K Issue on its
 system can be mitigated.  However,  if the plan for ensuring Y2K compliance and
 the  related  contingency  plans  were  to  fail,  be  insufficient,  or not be
 implemented  on a timely  basis,  operations of the Company could be materially
 impacted.

          Certain of the Company's other  non-computer  related systems that may
 be impacted by the Y2K Issue,  such as security  systems,  are currently  being
 evaluated,  and the Company expects the evaluation to be complete by June 1999.
 The Company expects the implementation of any required solutions to be complete
 in advance of December 31, 1999. The Company has not fully evaluated the impact
 of lack of Y2K compliance on these  systems,  but has no reason to believe that
 lack of compliance would materially impact its operations.

          The Company exchanges  electronic data with certain outside vendors in
 the banking and payroll processing areas. The Company has been advised by these
 vendors that their systems are or will be Y2K compliant and has requested a Y2K
 compliance  certification from these entities.  The Company is not aware of any
 other vendors,  suppliers, or other external agents with a Y2K Issue that would
 materially  impact the Company's results of operations,  liquidity,  or capital
 resources.  However,  the Company has no means of ensuring that external agents
 will be Y2K  compliant,  and there can be no  assurance  that the  Company  has
 identified  all such  external  agents.  The  inability  of external  agents to
 complete  their  Year  2000  compliance  process  in  a  timely  fashion  could
 materially impact the Company.  The effect of non-compliance by external agents
 is not determinable.

          The total cost of PSI's Y2K  compliance  activities  (which  primarily
 consists of the costs of  implementing  new  systems)  will be allocated to all
 entities that use the PSI computer  systems.  The amount to be allocated to the
 Company is estimated at approximately $250,000.

          The costs of the  projects  and the date on which PSI and the  Company
 believe  that  it  will be Y2K  compliant  are  based  upon  management's  best
 estimates,  and were derived utilizing  numerous  assumptions of future events.
 There can be no assurance  that these  estimates  will be achieved,  and actual
 results  could  differ  materially  from  those  anticipated.  There  can be no
 assurance  that PSI and the Company have  identified  all  potential Y2K Issues
 either within the Company or at external agents. In addition, the impact of the
 Y2K issue on  governmental  entities and utility  providers  and the  resultant
 impact on the Company,  as well as disruptions in the general  economy,  may be
 material but cannot be reasonably determined or quantified.


                                       23
<PAGE>

PART II. OTHER INFORMATION

Item 1.  Legal Proceedings

         PS Business Parks, L.P. v. Principal Mutual Life Insurance Company,  et
         -----------------------------------------------------------------------
al, Circuit Court of Washington County, Oregon (filed April 29, 1999)
- --

         In May 1998, the Company acquired a property in Beaverton,  Oregon.  An
adjacent property is the subject of an environmental remedial investigation. For
additional information on the investigation,  please refer to the Company's 1998
annual report on Form 10-K under "Item 7.  Management's  Discussion and Analysis
of Financial  Condition  and Results of Operations - Risk Factors - Our Business
Could Be Subject to Environmental Liabilities."

         In April 1999,  the Company  commenced an action against the sellers of
the property  seeking  indemnification  for any damages and expenses that may be
incurred by the Company in this matter and for other relief.  The Company is not
currently able to quantify the extent of such damages and expenses.

Item 6.  Exhibits and Reports on Form 8-K

      (a)    The following exhibits are included herein:

      (10.1) Amendment to Agreement of Limited Partnership of PS Business Parks,
             L.P.  Relating to 8 7/8% Series B Cumulative  Redeemable  Preferred
             Units, dated as of April 23, 1999.

      (10.2) Amendment to Agreement of Limited Partnership of PS Business Parks,
             L.P.  Relating to 9 1/4% Series A Cumulative  Redeemable  Preferred
             Units, dated as of April 30, 1999.

      (11)   Statement re: Computation of Earnings per Share

      (12)   Statement re: Computation of Ratio of Earnings to Fixed Charges

      (27)   Financial Data Schedule

      (b)    Reports on Form 8-K

             The  Registrant  filed a Current  Report on Form 8-K dated December
             31, 1998 (filed January 13, 1999) pursuant to Item 5 which reported
             the  acquisition  of  properties  from various third  parties.  The
             Registrant  filed a Current Report on Form 8-K/A dated December 31,
             1998 amending Form 8-K dated December 31, 1998 (filed  February 17,
             1999)  pursuant to Items 5 and 7 which filed  financial  statements
             for those properties.

                                   SIGNATURES

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

                                  Dated:  May 14, 1999

                                  PS BUSINESS PARKS, INC.
                                  BY: /s/ Jack Corrigan
                                      ------------------------------------------
                                      Jack Corrigan
                                      Vice President and Chief Financial Officer


                                       24


                                                                    Exhibit 10.1

                             PS BUSINESS PARKS, L.P.

                        AMENDMENT TO AGREEMENT OF LIMITED
                             PARTNERSHIP RELATING TO
                      8-7/8% SERIES B CUMULATIVE REDEEMABLE
                                 PREFERRED UNITS

                  This  Amendment to the Agreement of Limited  Partnership of PS
Business Parks,  L.P., a California  limited  partnership  (the  "Partnership"),
dated as of April 23, 1999 (this  "Amendment")  amends the  Agreement of Limited
Partnership  of the  Partnership,  dated as of March 17,  1998,  by and among PS
Business Parks,  Inc. (the "General  Partner") and each of the limited  partners
executing a signature page thereto (the  "Partnership  Agreement").  Capitalized
terms used herein and not otherwise  defined shall have the meanings ascribed to
such  terms  in  the  Partnership  Agreement.  Section  references  are  (unless
otherwise specified) references to sections in this Amendment.

                  WHEREAS,   pursuant  to  Section  4.2(a)  of  the  Partnership
Agreement,  the  General  Partner  desires  to cause  the  Partnership  to issue
additional Units of a new class and series,  with the designations,  preferences
and relative, participating, optional or other special rights, powers and duties
set forth herein;

                  WHEREAS,   pursuant  to  Section  4.2(a)  of  the  Partnership
Agreement, the General Partner, without the consent of the Limited Partners, may
amend the Partnership  Agreement by executing a written instrument setting forth
the terms of such amendment; and

                  WHEREAS,  the General  Partner desires by this Amendment to so
amend the Partnership  Agreement as of the date first set forth above to provide
for the designation and issuance of such new class and series of Units.

                  NOW, THEREFORE, the Partnership Agreement is hereby amended by
establishing  and fixing the rights,  limitations and preferences of a new class
and series of Units as follows:

                  Section  1.  Definitions.   Capitalized  terms  not  otherwise
defined herein shall have their respective meanings set forth in the Partnership
Agreement.  Capitalized  terms  that are used in this  Amendment  shall have the
meanings set forth below:

                  (a) "Liquidation Preference" means, with respect to the Series
B Preferred  Units,  $25.00 per Series B Preferred  Unit, plus the amount of any
accumulated and unpaid Priority Return with respect to such unit, whether or not
declared,  minus any  distributions  in excess of the  Priority  Return that has
accrued with respect to such Series B Preferred Units, to the date of payment.

                  (b)  "Parity  Preferred  Units"  means  any class or series of
Partnership Interests of the Partnership now or hereafter authorized,  issued or
outstanding and expressly designated by the Partnership to rank on a parity with
the  Series  B  Preferred  Units  (as  hereinafter   defined)  with  respect  to
distributions and rights upon voluntary or involuntary  liquidation,  winding-up
or dissolution of the Partnership.

                  (c)  "Priority  Return"  means an amount  equal to 8-7/8%  per
annum of the Liquidation  Preference per Series B Preferred Unit,  commencing on
the date of issuance of such Series B Preferred Unit, determined on the basis of
a 365-day  year (and actual days for any period),  cumulative  to the extent not
distributed on any Series B Preferred Unit Distribution Payment Date.

                  (d) "PTP" means a  "publicly  traded  partnership"  within the
meaning of Section 7704 of the Code.

                  Section 2. Designation and Number.  Pursuant to Section 4.2(a)
of the Partnership  Agreement,  a series of Partnership Units in the Partnership
designated as the "8-7/8% Series B Cumulative  Redeemable  Preferred Units" (the
"Series B  Preferred  Units")  is  hereby  established.  The  number of Series B

<PAGE>

Preferred Units shall be 510,000.  The Holders of Series B Preferred Units shall
not have any  Percentage  Interest  (as such term is defined in the  Partnership
Agreement) in the Partnership.

                  Section  3.  Distributions.   (a)  Payment  of  Distributions.
Subject to the rights of holders of Parity  Preferred Units as to the payment of
distributions,  pursuant to Section 5.1 of the Partnership Agreement, holders of
Series B Preferred Units shall be entitled to receive,  when, as and if declared
by the Partnership acting through the General Partner, the Priority Return. Such
distributions  shall be  cumulative,  shall  accrue  from the  original  date of
issuance of the Series B Preferred Units and, notwithstanding Section 5.1 of the
Partnership  Agreement,  will be payable (i)  quarterly  in arrears on March 31,
June 30,  September 30 and December 31 of each year commencing on June 30, 1999,
and (ii) in the  event of a  redemption  of  Series B  Preferred  Units  (each a
"Series B  Preferred  Unit  Distribution  Payment  Date").  If any date on which
distributions  are to be made on the Series B Preferred  Units is not a Business
Day (as defined  herein),  then payment of the  distribution  to be made on such
date will be made on the Business Day  immediately  preceding such date with the
same  force and effect as if made on such  date.  Distributions  on the Series B
Preferred  Units will be made to the holders of record of the Series B Preferred
Units on the relevant record dates to be fixed by the Partnership acting through
the General  Partner,  which record dates shall in no event exceed  fifteen (15)
Business Days prior to the relevant Series B Preferred Unit Distribution Payment
Date (the "Series B Preferred Unit Partnership Record Date").

                  (b) Prohibition on Distribution.  No distributions on Series B
Preferred  Units shall be authorized by the General Partner or paid or set apart
for payment by the  Partnership  at any such time as the terms and provisions of
any agreement of the Partnership or the General Partner, including any agreement
relating to their indebtedness, prohibits such authorization, payment or setting
apart for payment or provides that such authorization,  payment or setting apart
for payment would constitute a breach thereof or a default thereunder, or to the
extent that such  authorization  or payment shall be restricted or prohibited by
law.

                  (c)  Distributions  Cumulative.  Distributions on the Series B
Preferred  Units  will  accrue  whether or not the terms and  provisions  of any
agreement  of  the  Partnership,   including  any  agreement   relating  to  its
indebtedness at any time prohibit the current payment of distributions,  whether
or not the  Partnership  has  earnings,  whether or not there are funds  legally
available  for the  payment  of  such  distributions  and  whether  or not  such
distributions are authorized.  Accrued but unpaid  distributions on the Series B
Preferred Units will  accumulate as of the Series B Preferred Unit  Distribution
Payment Date on which they first  become  payable.  Distributions  on account of
arrears for any past distribution  periods may be declared and paid at any time,
without reference to a regular Series B Preferred Unit Distribution Payment Date
to holders of record of the Series B Preferred Units on the record date fixed by
the  Partnership  acting through the General Partner which date shall not exceed
fifteen (15)  Business Days prior to the payment  date.  Accumulated  and unpaid
distributions will not bear interest.

                  (d) Priority as to Distributions. Subject to the provisions of
Article 13 of the Partnership Agreement:

                  (i) so long as any Series B Preferred  Units are  outstanding,
no distribution of cash or other property shall be authorized, declared, paid or
set apart for payment on or with  respect to any class or series of  Partnership
Interest  ranking  junior as to the  payment of  distributions  or rights upon a
voluntary  or  involuntary   liquidation,   dissolution  or  winding-up  of  the
Partnership to the Series B Preferred Units (collectively,  "Junior Units"), nor
shall any cash or other  property  be set aside for or applied to the  purchase,
redemption  or other  acquisition  for  consideration  of any Series B Preferred
Units, any Parity Preferred Units or any Junior Units, unless, in each case, all
distributions  accumulated  on all Series B Preferred  Units and all classes and
series of  outstanding  Parity  Preferred  Units  have  been  paid in full.  The
foregoing sentence shall not prohibit (x) distributions payable solely in Junior
Units,  or (y) the  conversion  of Junior Units or Parity  Preferred  Units into
Partnership Interests ranking junior to the Series B Preferred Units.

                  (ii) So long as distributions have not been paid in full (or a
sum sufficient for such full payment is not  irrevocably  deposited in trust for
payment) upon the Series B Preferred  Units,  all  distributions  authorized and
declared  on the  Series  B  Preferred  Units  and  all  classes  or  series  of
outstanding  Parity Preferred Units shall be authorized and declared so that the
amount of distributions  authorized and declared per Series B Preferred Unit and
such other classes or series of Parity  Preferred  Units shall in all cases bear
to each other the same ratio that accrued  distributions  per Series B Preferred
Unit and such other classes or series of Parity Preferred Units (which shall not

<PAGE>

include  any  accumulation  in  respect  of  unpaid   distributions   for  prior
distribution  periods if such class or series of Parity  Preferred  Units do not
have cumulative distribution rights) bear to each other.


                  (e) No Further  Rights.  Holders of Series B  Preferred  Units
shall not be  entitled  to any  distributions,  whether  payable in cash,  other
property or otherwise, in excess of the full cumulative  distributions described
herein.

                  Section  4.  Allocations.  Section  6.1(a) of the  Partnership
Agreement is amended to read, in its entirety, as follows:

                  "(a) General

                  (i) Except as otherwise  set forth in this  Agreement,  Profit
and Loss and items of income, gain, expense, or loss of the Partnership for each
fiscal  year of the  Partnership  shall  be  allocated  among  the  Partners  in
accordance with their respective  Percentage  Interests.  The provisions of this
Section 6.1 shall be amended appropriately in the event that the General Partner
causes the  Partnership to issue Units with different  preferences or redemption
rights.

                  (ii)  Notwithstanding  anything to the  contrary  contained in
this  Agreement,  in any taxable year,  the holders of Series B Preferred  Units
shall be  allocated  an  amount of gross  income  equal to the  Priority  Return
distributed  to such  holders for such taxable  year.  Upon  liquidation  of the
Partnership  or the  interest of the holders of Series B Preferred  Units in the
Partnership,  an amount of Profit,  Loss or items  thereof shall be allocated to
the holders of Series B Preferred Units in a manner such that, immediately prior
to such  liquidation,  the Capital Account  balances of such holders shall equal
the amount of their Liquidation Preference."

                  Section  5.  Optional   Redemption.   (a)  Right  of  Optional
Redemption.  The Series B Preferred Units may not be redeemed prior to the fifth
(5th)  anniversary of the issuance date. On or after such date, the  Partnership
shall have the right to redeem the Series B Preferred  Units,  in whole (and not
in  part),  at any time,  upon not less  than 10 nor more than 60 days'  written
notice,  at a  redemption  price,  payable  in cash,  equal  to the  Liquidation
Preference  (the "Series B Redemption  Price").  The  Redemption  Right given to
Limited  Partners  in  Section  8.6 of the  Partnership  Agreement  shall not be
available to the holders of the Series B Preferred  Units and all  references to
Limited Partners in said Section 8.6 (and related  provisions of the Partnership
Agreement) shall not include holders of the Series B Preferred Units.

                  (a) Procedures for  Redemption.  (i) Notice of redemption will
be (A) faxed,  and (B) mailed by the  Partnership,  by certified  mail,  postage
prepaid,  not less than 10 nor more than 60 days prior to the  redemption  date,
addressed to the respective holders of record of the Series B Preferred Units at
their respective addresses as they appear on the records of the Partnership.  No
failure  to give or defect in such  notice  shall  affect  the  validity  of the
proceedings  for the redemption of any Series B Preferred Units except as to the
holder to whom such  notice was  defective  or not  given.  In  addition  to any
information  required by law, each such notice shall state:  (m) the  redemption
date, (n) the Redemption  Price,  (o) the aggregate number of Series B Preferred
Units to be  redeemed,(p) as provided in Section  5(b)(ii)  below,  the place or
places where evidence of the surrender of such Series B Preferred Units shall be
delivered for payment of the Redemption  Price,  (q) that  distributions  on the
Series B  Preferred  Units to be  redeemed  will  cease  to  accumulate  on such
redemption  date and (r) that payment of the Redemption  Price will be made upon
presentation  of evidence of the  surrender of such Series B Preferred  Units as
set forth in Section 5(b)(ii) below.

                  (ii)  If the  Partnership  gives a  notice  of  redemption  in
respect of Series B Preferred Units (which notice will be irrevocable)  then, by
12:00 noon, New York City time, on the redemption  date,  the  Partnership  will
deliver into escrow with an escrow agent  acceptable to the  Partnership and the
holders of the Series B Preferred  Units (the  "Escrow  Agent")  the  Redemption
Price and an  executed  Redemption  Agreement,  in the form  attached  hereto as
Exhibit A (the  "Redemption  Agreement"),  and an Amendment to the  Agreement of
Limited  Partnership  evidencing the Redemption,  in the form attached hereto as
Exhibit B. The  holders of the Series B Preferred  Units  shall  also,  by 10:00
noon, New York City time, on the redemption  date,  deliver into escrow with the
Escrow Agent an executed  Redemption  Agreement and an executed Amendment to the
Agreement of Limited Partnership evidencing the Redemption. Upon delivery of all
of the  above-described  items by both  parties,  Escrow Agent shall release the
Redemption  Price  to the  holders  of the  Series  B  Preferred  Units  and the
fully-executed  Redemption  Agreement  and  Amendment  to  Agreement  of Limited
Partnership to both parties. On and after the date of redemption,  distributions
<PAGE>

will cease to accumulate on the Series B Preferred  Units called for redemption,
unless the Partnership  defaults in the payment  thereof.  If any date fixed for
redemption  of Series B Preferred  Units is not a Business  Day, then payment of
the  Redemption  Price payable on such date will be made on the next  succeeding
day that is a Business Day (and without any interest or other payment in respect
of any such delay)  except that, if such Business Day falls in the next calendar
year,  such payment will be made on the immediately  preceding  Business Day, in
each case  with the same  force  and  effect  as if made on such date  fixed for
redemption. If payment of the Redemption Price is improperly withheld or refused
and not paid by the Partnership,  distributions on such Series B Preferred Units
will continue to  accumulate  from the original  redemption  date to the date of
payment, in which case the actual payment date will be considered the date fixed
for redemption for purposes of calculating the applicable Redemption Price.

                  Section 6. Voting Rights. (a) General. Holders of the Series B
Preferred  Units  will not have any  voting  rights or right to  consent  to any
matter requiring the consent or approval of the Limited Partners,  except as set
forth in  Section  14.1 of the  Partnership  Agreement  and in this  Section  6.
(Solely for purposes of Section 14.1 of the Partnership Agreement, each Series B
Preferred Unit shall be treated as one Partnership Unit.)

                  (b) Certain Voting  Rights.  So long as any Series B Preferred
Units remain  outstanding,  the Partnership  shall not,  without the affirmative
vote of the  holders of at least a  majority  of the  Series B  Preferred  Units
outstanding at the time: (i) authorize or create,  or increase the authorized or
issued amount of, any class or series of Partnership  Interests ranking prior to
the Series B Preferred Units with respect to payment of  distributions or rights
upon  liquidation,  dissolution  or  winding-up or  reclassify  any  Partnership
Interests into any such Partnership Interest, or create,  authorize or issue any
obligations or security convertible into or evidencing the right to purchase any
such Partnership Interests; (ii) designate or create, or increase the authorized
or issued amount of, any Parity  Preferred  Units or reclassify  any  authorized
Partnership Interests into any such Parity Preferred Units, or create, authorize
or issue any obligations or security convertible into or evidencing the right to
purchase any such shares, but only to the extent such Parity Preferred Units are
issued to an Affiliate of the Partnership on terms that differ from the terms of
any  Parity  Preferred  Units  issued  to the  public or  non-Affiliates  of the
Partnership (for purposes of this Section  6(b)(ii),  an issuance to the General
Partner  shall not be treated as an issuance to an Affiliate of the  Partnership
to the  extent  the  issuance  of such  Partnership  Interests  was to allow the
General  Partner to issue  corresponding  preferred stock to persons who are not
Affiliates);  or (iii) either (A) exchange  shares,  consolidate,  merge into or
with, or convey,  transfer or lease its assets  substantially as an entirety to,
any corporation or other entity or (B) amend,  alter or repeal the provisions of
the Partnership Agreement,  whether by merger,  consolidation or otherwise, that
would adversely affect the powers,  special rights,  preferences,  privileges or
voting power of the Series B Preferred Units or the holders  thereof;  provided,
however,  that with  respect  to the  occurrence  of a share  exchange,  merger,
consolidation  or a sale  or  lease  of all of the  Partnership's  assets  as an
entirety,  so long as (1) the Partnership is the surviving entity and the Series
B Preferred Units remain  outstanding with the terms thereof  unchanged,  or (2)
the  resulting,  surviving  or  transferee  entity  is  a  partnership,  limited
liability company or other  pass-through  entity organized under the laws of any
state and  substitutes  the Series B Preferred Units for other interests in such
entity having  substantially the same terms and rights as the Series B Preferred
Units,  including with respect to  distributions,  voting rights and rights upon
liquidation,  dissolution or  winding-up,  then the occurrence of any such event
shall not be deemed to adversely affect such rights, privileges or voting powers
of the holders of the Series B Preferred  Units;  and provided  further that any
increase in the amount of  Partnership  Interests or the creation or issuance of
any other class or series of  Partnership  Interests,  in each case  ranking (y)
junior to the Series B Preferred Units with respect to payment of  distributions
or the distribution of assets upon  liquidation,  dissolution or winding-up,  or
(z) on a parity to the  Series B  Preferred  Units  with  respect  to payment of
distributions  or the  distribution of assets upon  liquidation,  dissolution or
winding-up,  to the  extent  such  Partnership  Interests  are not  issued to an
Affiliate of the  Partnership  (an issuance to the General  partner shall not be
treated as an  issuance to an  Affiliate  of the  Partnership  to the extent the
issuance of such Partnership Interests was to allow the General Partner to issue
corresponding  preferred  stock  to  persons  who  are  not  Affiliates  of  the
Partnership)  such  issuance  shall not be deemed to  materially  and  adversely
affect such rights,  preferences,  privileges or voting powers.  Notwithstanding
anything to the  contrary  contained in this Section 6, if holders of a majority
of the Series B  Preferred  Units do not  approve  of a  proposed  action by the
Partnership  described in clause  (iii) of the  immediately  preceding  sentence
which, in the reasonable judgment of the Partnership,  results in the holders of
Series B Preferred Units having  substantially  the same terms and rights as the
Series B Preferred Units, including with respect to distributions, voting rights
and rights upon  liquidation,  dissolution or  winding-up,  and the holders of a

<PAGE>

majority of the Series B Preferred Units do not  affirmatively  vote in favor of
such proposed action, then the Partnership may proceed with such proposed action
and the sole remedy of the holders of the Series B Preferred  Units shall be the
acceleration  of the exchange date relating to the Series B Preferred  Units, as
set forth in Section 8 of this Amendment.  In the event of any conflict  between
the provisions of Section 4.2 of the Partnership Agreement and the provisions of
this Section 6, the provisions of this Section 6 shall control.

                  Section  7.  Transfer  Restrictions.  The  holders of Series B
Preferred  Units shall be subject to all of the  provisions of Section 11 of the
Partnership  Agreement  as modified by this Section 7. Subject to the consent of
the General Partner,  which shall not be unreasonably  withheld or delayed,  the
Series B Preferred Units may be transferred to a maximum of five (5) persons. At
no time shall the number of holders of the Series B Preferred Units exceed five.

                  Section 8. Exchange Rights. (a) Right to Exchange.  (i) Series
B Preferred Units will be exchangeable in whole (and not in part) at any time on
or after the tenth (10th) anniversary of the date of issuance,  at the option of
the Partnership or a majority of the holders  thereof  (acting as a whole),  for
authorized  but  previously  unissued  shares  of  8-7/8%  Series  B  Cumulative
Redeemable  Preferred  Stock of the  General  Partner  (the  "Series B Preferred
Stock") at an  exchange  rate of one share of Series B  Preferred  Stock for one
Series B Preferred Unit, subject to adjustment as described below (the "Series B
Exchange  Price");  provided  that the  Series B  Preferred  Units  will  become
exchangeable  at any  time,  in whole  (and not in  part),  at the  option  of a
majority  of the  holders of Series B  Preferred  Units  (acting as a whole) for
Series B Preferred  Stock if (x) at any time full  distributions  shall not have
been timely made on any Series B  Preferred  Unit with  respect to six (6) prior
quarterly distribution periods, whether or not consecutive;  provided,  however,
that a distribution  in respect of Series B Preferred  Units shall be considered
timely made if made within two (2) Business Days after the  applicable  Series B
Preferred  Units  Distribution  Payment Date if at the time of such late payment
there shall not be any prior quarterly  distribution periods in respect of which
full distributions were not timely made, (y) upon receipt by a holder or holders
of Series B  Preferred  Units of (1) notice from the  General  Partner  that the
General  Partner or a Subsidiary  of the General  Partner has taken the position
that the  Partnership  is,  or upon the  occurrence  of a  defined  event in the
immediate  future  will  be, a PTP and (2) an  opinion  rendered  by an  outside
nationally  recognized  independent counsel familiar with such matters addressed
to a holder or holders of Series B Preferred  Units,  that the Partnership is or
likely is, or upon the  occurrence of a defined  event in the  immediate  future
will be or likely  will be, a PTP,  or (z) the holders of the Series B Preferred
Units hold or will hold 20% or more of the profits and capital  interests of the
Partnership,  provided  further  that,  in the case of clause (z),  the Series B
Preferred Units will be exchangeable  only to the extent necessary to reduce the
holdings of the holders of the Series B Preferred  Units to less than 20% of the
capital  and profits  interests  of the  Partnership.  In addition to and not in
limitation of the foregoing,  the Series B Preferred  Units may be exchanged for
Series B  Preferred  Stock,  in whole  (and not in part),  at the  option of the
holders of a majority of the Series B Preferred  Units (acting as a whole) prior
to the  tenth  (10th)  anniversary  of the  issuance  date and  after  the third
anniversary  thereof if such holder of Series B Preferred Units shall deliver to
the General Partner either (i) a private letter ruling  addressed to such holder
of Series B Preferred Units or (ii) an opinion of independent counsel reasonably
acceptable  to the General  Partner based on the enactment of temporary or final
Treasury  Regulations or the publication of a Revenue Ruling,  in either case to
the effect that an exchange of the Series B Preferred Units at such earlier time
would  not  cause the  Series B  Preferred  Units to be  considered  "stock  and
securities" within the meaning of section 351(e) of the Internal Revenue Code of
1986, as amended (the "Code") for purposes of determining  whether the holder of
such Series B Preferred Units is an "investment company" under section 721(b) of
the Code if an exchange is permitted at such  earlier  date.  In addition to and
not in  limitation  of the  foregoing,  the  Series  B  Preferred  Units  may be
exchanged in whole (and not in part) (regardless of whether held by Contributor)
at the  option of the  holders of a majority  of the  Series B  Preferred  Units
(acting as a whole) for Series B  Preferred  Stock (but only if the  exchange in
whole may be accomplished  consistently with the ownership limitations set forth
under the Article IV of the Charter of the General Partner,  taking into account
exceptions  thereto) if at any time, (i) the  Partnership or the General Partner
breach any of the  covenants  set forth in  Paragraphs  4(d)  through (h) of the
Contribution  Agreement,  dated as of April 23, 1999,  among SSB Tax  Advantaged
Exchange Fund I, LLC  ("Contributor"),  the Partnership and the General Partner,
(ii) the  Partnership  reasonably  determines  that the assets and income of the
Partnership  for a taxable  year  after 1999  would not  satisfy  the income and
assets tests of Section 856 of the Code for such taxable year if the Partnership
were a real estate  investment trust within the meaning of the Code, (iii) under
the circumstances described in the penultimate sentence of Section 6(b), or (iv)
any holder of Series B Preferred  Units shall deliver to the Partnership and the
Company an opinion of independent  counsel reasonably  acceptable to the Company
to the effect  that,  based on the assets  and income of the  Partnership  for a
<PAGE>

taxable year after 1999, the Partnership would not satisfy the income and assets
tests of Section 856 of the Code for such taxable year if the Partnership were a
real estate  investment  trust  within the meaning of the Code,  and that in the
case of each of (ii) and (iv),  such failure would create a meaningful risk that
a holder of the Series B Preferred Units would fail to maintain qualification as
a real estate investment trust.

                  (ii)  Notwithstanding  anything to the  contrary  set forth in
Section  8(a)(i),  if an  Exchange  Notice  (as  hereinafter  defined)  has been
delivered to the General  Partner,  then the General Partner may, at its option,
elect to redeem or cause the  Partnership  to redeem all (but not a portion)  of
the  outstanding  Series B  Preferred  Units for cash in an amount  equal to the
Liquidation  Preference  per Series B Preferred  Unit.  The General  Partner may
exercise its option to redeem the Series B Preferred  Units for cash pursuant to
this  Section  8(a)(ii)  by giving  each  holder of record of Series B Preferred
Units notice of its election to redeem for cash,  within five (5) Business  Days
after  receipt of the  Exchange  Notice,  by (m) fax, and (n)  registered  mail,
postage  paid,  at the address of each holder as it may appear on the records of
the Partnership  stating (A) the redemption  date,  which shall be no later than
sixty (60) days following the receipt of the Exchange Notice, (B) the redemption
price,  (C) the place or places  where the  Series B  Preferred  Units are to be
surrendered for payment of the redemption  price, (D) that  distributions on the
Series B Preferred Units will cease to accrue on such redemption  date; (E) that
payment of the redemption price will be made upon  presentation and surrender of
the Series B Preferred Units and (F) the aggregate  number of Series B Preferred
Units to be redeemed.

                  (iii) If an exchange of Series B Preferred  Units  pursuant to
Section  8(a)(i)  would violate the  provisions  on ownership  limitation of the
General  Partner set forth in Article IV of the  Charter of the General  Partner
with respect to the Series B Preferred  Stock,  the General  Partner  shall give
written  notice  thereof to each holder of record of Series B  Preferred  Units,
within five (5) Business Days following  receipt of the Exchange Notice,  by (m)
fax,  and (n)  registered  mail,  postage  prepaid,  at the address of each such
holder set forth in the records of the Partnership.  In such event,  each holder
of Series B  Preferred  Units shall be  entitled  to  exchange,  pursuant to the
provisions  of Section  8(b) a number of Series B  Preferred  Units  which would
comply with the  provisions on the ownership  limitation of the General  Partner
set forth in such  Article IV of the  Charter  of the  General  Partner  and any
Series B Preferred Units not so exchanged (the "Excess Units") shall be redeemed
by the Partnership  for cash in an amount equal to the  Liquidation  Preference.
The written  notice of the General  Partner shall state (A) the number of Excess
Units held by such holder, (B) the redemption price of the Excess Units, (C) the
date on which such Excess Units shall be redeemed,  which date shall be no later
than sixty (60) days following the receipt of the Exchange Notice, (D) the place
or places  where such  Excess  Units are to be  surrendered  for  payment of the
Redemption  Price,  (E) that  distributions  on the  Excess  Units will cease to
accrue on such  redemption  date, and (F) that payment of the  redemption  price
will be made  upon  presentation  and  surrender  of such  Excess  Units.  If an
exchange  would result in Excess Units,  as a condition to such  exchange,  each
holder of such units agrees to provide  representations and covenants reasonably
requested by the General  Partner  relating to (1) the widely held nature of the
interests  in such  holder,  sufficient  to assure the General  Partner that the
holder's ownership of stock of the General Partner (without regard to the limits
described  above)  will not cause any  Person  (as such term is  defined  in the
Charter of the General Partner) to own stock of the General Partner in an amount
that would cause such Person not to comply with the  provisions on the ownership
limitation of the General Partner set forth in such Article IV of the Charter of
the General  Partner;  and (2) to the extent such  holder can so  represent  and
covenant without obtaining  information from its owners,  the holder's ownership
of tenants of the Partnership and its affiliates.
<PAGE>

                  (iv) The redemption of Series B Preferred  Units  described in
Section 8(a)(ii) and (iii) shall be subject to the provisions of Section 5(b)(i)
and Section 5(c)(ii);  provided,  however,  that the term "redemption  price" in
such  Section  shall be read to mean the  Liquidation  Preference  per  Series B
Preferred Unit being redeemed.

                  (b)  Procedure  for  Exchange.   (i)  Any  exchange  shall  be
exercised  pursuant to a notice of exchange (the "Exchange Notice") delivered to
the General  Partner by the holder who is exercising such exchange right, by (a)
fax and (b) by  certified  mail  postage  prepaid.  The  exchange  of  Series  B
Preferred  Units may be effected  after the fifth (5th)  Business Day  following
receipt  by  the  General   Partner  of  the  Exchange   Notice  by   delivering
certificates, if any, representing such Series B Preferred Units to be exchanged
together with, if applicable, written notice of exchange and a proper assignment
of such Series B Preferred Units to the office of the General Partner maintained
for such purpose.  Currently,  such office is c/o PS Business  Parks,  Inc., 701
Western Avenue,  Glendale,  California 91201, Attention:  Jack E. Corrigan. Each
exchange will be deemed to have been effected  immediately prior to the close of
business  on the date on which such  Series B  Preferred  Units to be  exchanged
(together  with all  required  documentation)  shall have been  surrendered  and
notice  shall have been  received by the General  Partner as  aforesaid  and the
Exchange  Price  shall  have been  paid.  Any Series B  Preferred  Stock  issued
pursuant  to this  Section  8 shall  be  delivered  as  shares  which  are  duly
authorized, validly issued, fully paid and nonassessable,  free of pledge, lien,
encumbrance or restriction other than those provided in the Charter,  the ByLaws
of the General  Partner,  the  Securities  Act of 1933,  as amended and relevant
state securities or blue sky laws.

                  (ii) In the event of an exchange  of Series B Preferred  Units
for shares of Series B  Preferred  Stock,  an amount  equal to the  accrued  and
unpaid Priority Return,  whether or not declared, to the date of exchange on any
Series B Preferred Units tendered for exchange shall (a) accrue on the shares of
the  Series B  Preferred  Stock into which  such  Series B  Preferred  Units are
exchanged,  and (b) continue to accrue on such Series B Preferred  Units,  which
shall remain  outstanding  following such exchange,  with the General Partner as
the holder of such Series B  Preferred  Units.  Notwithstanding  anything to the
contrary  set forth  herein,  in no event shall a holder of a Series B Preferred
Unit that was validly  exchanged into Series B Preferred  Stock pursuant to this
section  (other  than the General  Partner  now holding  such Series B Preferred
Unit),  receive a  distribution  from the  Partnership,  if such  holder,  after
exchange,  is entitled to receive a distribution  from the General  Partner with
respect  to the  share of Series B  Preferred  Stock  for  which  such  Series B
Preferred Unit was exchanged or redeemed.

                  (iii) Fractional shares of Series B Preferred Stock are not to
be issued upon  exchange but, in lieu  thereof,  the General  Partner will pay a
cash adjustment based upon the fair market value of the Series B Preferred Stock
on the day prior to the exchange  date as  determined in good faith by the Board
of Directors of the General Partner.

                  (c)  Adjustment of Exchange  Price.  (i) The Exchange Price is
subject  to  adjustment  upon  certain  events,   including,  (a)  subdivisions,
combinations  and  reclassification  of the Series B  Preferred  Stock,  and (b)
distributions  to all  holders  of  Series B  Preferred  Stock of  evidences  of
indebtedness  of the  General  Partner  or  assets  (including  securities,  but
excluding  dividends and distributions  paid in cash out of equity applicable to
Series B Preferred Stock).

                  (ii) In case  the  General  Partner  shall  be a party  to any
transaction (including,  without limitation, a merger, consolidation,  statutory
share  exchange,  tender  offer  for  all or  substantially  all of the  General
Partner's  capital  stock  or sale of all or  substantially  all of the  General
Partner's  assets),  in each case as a result of which  the  Series B  Preferred
Stock will be converted into the right to receive shares of capital stock, other
securities or other property (including cash or any combination  thereof),  each
Series B Preferred Unit will thereafter be exchangeable into the kind and amount
of  shares  of  capital  stock  and other  securities  and  property  receivable
(including  cash or any  combination  thereof)  upon  the  consummation  of such
transaction by a holder of that number of shares of Series B Preferred  Stock or
fraction  thereof  into  which  one  Series B  Preferred  Unit was  exchangeable
immediately  prior to such  transaction.  The  General  Partner may not become a
party to any such  transaction  unless the terms thereof are consistent with the
foregoing.  In the event of a conflict  between the  provisions  of this Section
8(c)(ii) and any provision of the Partnership Agreement,  the provisions of this
Section 8(c)(ii) shall control.


<PAGE>

                  Section  9. No  Conversion  Rights.  Except  as set  forth  in
Section 8, the holders of the Series B Preferred Units shall not have any rights
to convert  such units into shares of any other class or series of stock or into
any other securities of, or interest in, the Partnership.

                  Section  10.  No  Sinking  Fund.  No  sinking  fund  shall  be
established for the retirement or redemption of Series B Preferred Units.

                  Section 11.  Exhibit A to Partnership  Agreement.  In order to
duly reflect the issuance of the Series B Preferred  Units  provided for herein,
the  Partnership  Agreement is hereby further  amended  pursuant to Section 12.3
thereof by deleting  Exhibit A thereto and replacing  Exhibit A attached  hereto
therefor.

                  Section 12. Inconsistent  Provisions.  Nothing to the contrary
contained  in the  Partnership  Agreement  shall  limit  any of  the  rights  or
obligations set forth in this Amendment.

                  IN WITNESS WHEREOF, this Amendment has been executed as of the
date first above written.


                                  PS BUSINESS PARKS, INC.


 
                                  By: /s/ Jack Corrigan
                                      --------------------------------------    
                                      Jack Corrigan
                                      Vice President and Chief Financial Officer


<PAGE>


                                                                    Exhibit 10.2
                             PS BUSINESS PARKS, L.P.

                        AMENDMENT TO AGREEMENT OF LIMITED
                            PARTNERSHIP RELATING TO
                       9 1/4% SERIES A CUMULATIVE REDEEMABLE
                                 PREFERRED UNITS

                  This  Amendment to the Agreement of Limited  Partnership of PS
Business Parks,  L.P., a California  limited  partnership  (the  "Partnership"),
dated as of April 30, 1999 (this "Amendment"),  amends the Agreement of Limited
Partnership of the Partnership,  dated as of March 17, 1998, as amended,  by and
among PS Business  Parks,  Inc. (the "General  Partner") and each of the limited
partners described on Exhibit A to that partnership  agreement (the "Partnership
Agreement").  Section references are (unless otherwise specified)  references to
sections in this Amendment.

                  WHEREAS,   the  General  Partner  agreed  to  issue  2,200,000
 Depositary  Shares  each  representing  1/1000th  of a  share  of  the  General
 Partner's preferred stock designated as the "9 1/4% Cumulative Preferred Stock,
 Series A" (the "Depositary Shares") for a price of $25.00 per Depositary Share;

                  WHEREAS,   Section  4.1(b)(2)  of  the  Partnership  Agreement
 requires the General  Partner to contribute to the Partnership the funds raised
 through the issuance of additional  shares of the General Partner in return for
 additional  Partnership  Units, and provides that the General Partner's capital
 contribution  shall be deemed to equal the amount of the gross proceeds of that
 share  issuance  (i.e.,  the  net  proceeds  actually  contributed,   plus  any
 underwriter's  discount or other expenses  incurred,  with any such discount or
 expense deemed to have been incurred on behalf of the Partnership);

                  WHEREAS,  Section 4.2(a) of the Partnership Agreement provides
 generally  for the  creation  and  issuance  of  Partnership  Units  with  such
 designations,  preferences  and  relative,  participating,  optional  or  other
 special rights,  powers and duties,  including rights, powers and duties senior
 to other  Partnership  Interests,  all as shall be  determined  by the  General
 Partner, without the consent of the Limited Partners, and Section 4.2(b) of the
 Partnership  Agreement  specifically  contemplates the issuance of Units to the
 General Partner having  designations,  preferences  and other rights,  all such
 that the economic  interests  are  substantially  similar to the  designations,
 preferences and other rights of shares issued by the General  Partner,  such as
 the Depositary Shares;

                  WHEREAS,  the General Partner desires to cause the Partnership
to issue  additional  Units of a new class and  series,  with the  designations,
preferences  and  relative,  participating,  optional or other  special  rights,
powers and duties set forth herein; and

                  WHEREAS,  the General  Partner desires by this Amendment to so
amend the Partnership  Agreement as of the date first set forth above to provide
for the designation and issuance of such new class and series of Units.

                  NOW, THEREFORE, the Partnership Agreement is hereby amended by
establishing  and fixing the rights,  limitations and preferences of a new class
and series of Units as follows:

                  Section  1.  Definitions.   Capitalized  terms  not  otherwise
defined herein shall have their respective meanings set forth in the Partnership
Agreement.  Capitalized  terms  that are used in this  Amendment  shall have the
meanings set forth below:

                  (a) "Liquidation Preference" means, with respect to the Series
A Preferred Units,  $25.00 per Series A Preferred Unit (as defined below),  plus
the amount of any  accumulated  and unpaid  Priority Return with respect to such
Unit, whether or not declared, minus any distributions in excess of the Priority
Return that has accrued  with respect to such Series A Preferred  Units,  to the
date of payment.

                  (b)  "Parity  Preferred  Units"  means  any class or series of
Partnership Interests of the Partnership now or hereafter authorized,  issued or
outstanding and expressly designated by the Partnership to rank on a parity with
the Series A  Preferred  Units with  respect to  distributions  and rights  upon
voluntary  or  involuntary   liquidation,   winding-up  or  dissolution  of  the
Partnership.  The 8 7/8% Series B Cumulative  Redeemable  Preferred Units of the
Partnership created pursuant to an amendment to the Partnership  Agreement dated
as of April 23, 1999 (the "Series B Preferred Units") and the Series A Preferred
Units are expressly  designated as Parity  Preferred  Units with respect to each
other.
<PAGE>

                  (c)  "Priority  Return"  means an  amount  equal to 9 1/4% per
 annum of the Liquidation  Preference per Series A Preferred Unit, commencing on
 the date of issuance of such Series A Preferred  Unit,  determined on the basis
 of a 360-day  year (and twelve  30-day  months),  cumulative  to the extent not
 distributed  on any  Series A  Preferred  Unit  Distribution  Payment  Date (as
 defined below).

                  Section  2.  Creation  of  Series  A  Preferred   Units.   (a)
 Designation  and  Number.   Pursuant  to  Section  4.2(a)  of  the  Partnership
 Agreement,  a series of Partnership Units in the Partnership  designated as the
 "9 1/4%  Series  A  Cumulative  Redeemable  Preferred  Units"  (the  "Series  A
 Preferred  Units") is hereby  established  effective as of April 30, 1999.  The
 number of Series A Preferred Units shall be 2,200,000.  The Holders of Series A
 Preferred Units shall not have any Percentage Interest (as such term is defined
 in the Partnership Agreement) in the Partnership.

                  (b) Capital  Contribution.  In return for the  issuance to the
 General  Partner of the Series A Preferred Units set forth on Exhibit C to this
 Amendment,  the General  Partner has  contributed to the  Partnership the funds
 raised through the General  Partner's  issuance of the  Depositary  Shares (the
 General Partner's capital  contribution  shall be deemed to equal the amount of
 the gross  proceeds of that share  issuance,  i.e.,  the net proceeds  actually
 contributed,  plus any underwriter's discount or other expenses incurred,  with
 any such  discount  or  expense  deemed to have been  incurred  by the  General
 Partner on behalf of the Partnership).

                  (c)  Construction.  The  Series A  Preferred  Units  have been
 created and are being issued in conjunction with the General Partner's issuance
 of the Depositary  Shares  relating to the General  Partner's 9 1/4% Cumulative
 Preferred  Stock,  Series  A, and as such,  the  Series A  Preferred  Units are
 intended to have designations,  preferences and other rights, all such that the
 economic interests are substantially  similar to the designations,  preferences
 and other  rights of the  Depositary  Shares,  and the terms of this  Amendment
 shall be interpreted in a fashion consistent with this intent.

                  Section  3.  Distributions.   (a)  Payment  of  Distributions.
 Subject to the rights of holders of Parity Preferred Units as to the payment of
 distributions, pursuant to Section 5.1 of the Partnership Agreement, holders of
 Series A Preferred Units shall be entitled to receive, when, as and if declared
 by the Partnership  acting through the General  Partner,  the Priority  Return.
 Such distributions shall be cumulative,  shall accrue from the original date of
 issuance of the Series A Preferred  Units and,  notwithstanding  Section 5.1 of
 the  Partnership  Agreement,  will be payable (i) quarterly in arrears on March
 31, June 30,  September 30 and December 31 of each year  commencing on June 30,
 1999, and (ii) in the event of a redemption of Series A Preferred Units (each a
 "Series A Preferred  Unit  Distribution  Payment  Date").  If any date on which
 distributions  are to be made on the Series A Preferred Units is not a Business
 Day (as defined  herein),  then payment of the  distribution to be made on such
 date will be made on the Business Day immediately  preceding such date with the
 same force and effect as if made on such  date.  Distributions  on the Series A
 Preferred Units will be made to the holders of record of the Series A Preferred
 Units on the  relevant  record  dates to be  fixed  by the  Partnership  acting
 through the  General  Partner,  which  record  dates  shall in no event  exceed
 fifteen  (15)  Business  Days prior to the  relevant  Series A  Preferred  Unit
 Distribution Payment Date. Business Day shall be any day other than a Saturday,
 Sunday  or day on which  banking  institutions  in the State of New York or the
 State of California are authorized or obligated by law to close, or a day which
 is or is declared a national or a New York or California state holiday.

                  (b) Prohibition on Distribution.  No distributions on Series A
 Preferred Units shall be authorized by the General Partner or paid or set apart
 for payment by the  Partnership at any such time as the terms and provisions of
 any  agreement  of  the  Partnership  or the  General  Partner,  including  any
 agreement relating to their indebtedness, prohibits such authorization, payment
 or setting  apart for payment or provides that such  authorization,  payment or
 setting  apart for  payment  would  constitute  a breach  thereof  or a default
 thereunder,  or to the  extent  that such  authorization  or  payment  shall be
 restricted or prohibited by law.
<PAGE>

                  (c)  Distributions  Cumulative.  Distributions on the Series A
 Preferred  Units will  accrue  whether or not the terms and  provisions  of any
 agreement  of  the  Partnership,   including  any  agreement  relating  to  its
 indebtedness at any time prohibit the current payment of distributions, whether
 or not the  Partnership  has  earnings,  whether or not there are funds legally
 available  for the  payment  of such  distributions  and  whether  or not  such
 distributions are authorized.  Accrued but unpaid distributions on the Series A
 Preferred Units will accumulate as of the Series A Preferred Unit  Distribution
 Payment Date on which they first become  payable.  Distributions  on account of
 arrears for any past distribution periods may be declared and paid at any time,
 without  reference to a regular  Series A Preferred Unit  Distribution  Payment
 Date to holders of record of the Series A  Preferred  Units on the record  date
 fixed by the  Partnership  acting through the General  Partner which date shall
 not exceed  fifteen (15) Business  Days prior to the payment date.  Accumulated
 and unpaid distributions will not bear interest.

                  (d) Priority as to Distributions. Subject to the provisions of
 Article 13 of the Partnership Agreement:

                  (i) So long as any Series A Preferred  Units are  outstanding,
 no distribution of cash or other property shall be authorized,  declared,  paid
 or set  apart  for  payment  on or with  respect  to any  class  or  series  of
 Partnership  Interest  ranking  junior as to the  payment of  distributions  or
 rights upon a voluntary or involuntary  liquidation,  dissolution or winding-up
 of the  Partnership  to the Series A  Preferred  Units  (collectively,  "Junior
 Units"),  nor shall any cash or other  property  be set aside for or applied to
 the purchase, redemption or other acquisition for consideration of any Series A
 Preferred  Units, any Parity  Preferred Units or any Junior Units,  unless,  in
 each case, all  distributions  accumulated on all Series A Preferred  Units and
 all classes and series of outstanding  Parity Preferred Units have been paid in
 full.  The  foregoing  sentence  shall not prohibit (x)  distributions  payable
 solely  in  Junior  Units,  or (y) the  conversion  of  Junior  Units or Parity
 Preferred  Units  into  Partnership  Interests  ranking  junior to the Series A
 Preferred Units.

                  (ii) So long as distributions have not been paid in full (or a
 sum sufficient for such full payment is not irrevocably  deposited in trust for
 payment) upon the Series A Preferred  Units, all  distributions  authorized and
 declared  on the  Series  A  Preferred  Units  and all  classes  or  series  of
 outstanding Parity Preferred Units shall be authorized and declared so that the
 amount of distributions authorized and declared per Series A Preferred Unit and
 such other classes or series of Parity  Preferred Units shall in all cases bear
 to each other the same ratio that accrued  distributions per Series A Preferred
 Unit and such other  classes or series of Parity  Preferred  Units (which shall
 not  include  any  accumulation  in respect of unpaid  distributions  for prior
 distribution  periods if such class or series of Parity  Preferred Units do not
 have cumulative distribution rights) bear to each other.

                  (e) No Further  Rights.  Holders of Series A  Preferred  Units
 shall not be  entitled to any  distributions,  whether  payable in cash,  other
 property or otherwise, in excess of the full cumulative distributions described
 herein.

                  Section 4. Allocations.  Section 6.1(a)(ii) of the Partnership
 Agreement is amended to read, in its entirety, as follows:

                  " (ii)  Notwithstanding  anything to the contrary contained in
 this  Agreement,  in any taxable year, the holders of Series A Preferred  Units
 and Series B Preferred Units shall be allocated an amount of gross income equal
 to the Priority Return distributed to such holders for such taxable year. After
 the Capital Account balances of all Partners other than holders of the Series A
 Preferred  Units have been  reduced  to zero,  losses of the  Partnership  that
 otherwise would be allocated so as to cause deficit  Capital  Account  balances
 for those  other  Partners  shall be  allocated  to the holders of the Series A
 Preferred Units until the Capital Account balances of the holders of the Series
 A  Preferred  Units  have  been  reduced  to  zero.  Upon  liquidation  of  the
 Partnership  or the  interest of the  holders of Series A  Preferred  Units and
 Series B Preferred Units in the Partnership, an amount of Profit, Loss or items
 thereof  shall be  allocated  to the  holders of Series A  Preferred  Units and
 Series B  Preferred  Units in a manner  such  that,  immediately  prior to such
 liquidation,  the  Capital  Account  balances of such  holders  shall equal the
 amount of their Liquidation Preference."

                  Section 5. Optional  Redemption.  The Series A Preferred Units
 shall be redeemed at the same time, to the same extent, and applying, except as
 set forth below,  similar procedures,  as any redemption by the General Partner
 of the Depositary  Shares.  The redemption price,  payable in cash, shall equal
 the  Liquidation  Preference (the  "Redemption  Price").  The Partnership  will
 deliver into escrow with an escrow agent  acceptable to the Partnership and the
 holders of the Series A Preferred Units being redeemed (the "Escrow Agent") the
 Redemption Price and an executed Redemption Agreement, in the substantially the
 form attached as Exhibit A (the  "Redemption  Agreement"),  and an Amendment to
 the  Agreement  of  Limited  Partnership  evidencing  the  Redemption,  in  the
 substantially  the form  attached  as  ExhibitB.  The  holders of the Series A
 Preferred  Units to be redeemed  will also  deliver into escrow with the Escrow
 Agent  an  executed  Redemption  Agreement  and an  executed  Amendment  to the
 Agreement of Limited  Partnership  evidencing the redemption.  Upon delivery of
 all of the  above-described  items by both parties,  on the redemption date the
 Escrow Agent shall release the Redemption  Price to the holders of the Series A
 Preferred Units and the  fully-executed  Redemption  Agreement and Amendment to
 Agreement  of Limited  Partnership  to both  parties.  On and after the date of
 redemption,  distributions  will cease to  accumulate on the Series A Preferred
 Units called for redemption,  unless the Partnership defaults in the payment of
 the Redemption Price. The Redemption Right given to Limited Partners in Section
 8.6 of the  Partnership  Agreement shall not be available to the holders of the
 Series A Preferred Units and all references to Limited Partners in said Section
 8.6 (and related  provisions of the  Partnership  Agreement)  shall not include
 holders of the Series A Preferred Units.

                  Section 6.  Voting  Rights.  Holders of the Series A Preferred
 Units  will not have any  voting  rights  or  right to  consent  to any  matter
 requiring the consent or approval of the Limited Partners,  except as set forth
 in Section 14.1 of the Partnership  Agreement and in this Section 6. Solely for
 purposes of Section 14.1 of the Partnership Agreement,  each Series A Preferred
 Unit shall be treated as one Partnership Unit.

                  Section  7.  Transfer  Restrictions.  The  holders of Series A
 Preferred  Units shall be subject to all of the provisions of Section 11 of the
 Partnership Agreement.

                  Section 8. No Conversion  Rights.  The holders of the Series A
 Preferred  Units shall not have any rights to convert such units into shares of
 any other class or series of stock or into any other securities of, or interest
 in,  the  Partnership.  Section 9. No Sinking  Fund.  No sinking  fund shall be
 established for the retirement or redemption of Series A Preferred Units.

                  Section 10.  Exhibit A to Partnership  Agreement.  In order to
 duly reflect the issuance of the Series A Preferred  Units provided for herein,
 the Partnership Agreement is hereby further amended pursuant to Section 12.3 of
 the  Partnership  Agreement by  replacing  the current form of Exhibit A to the
 Partnership  Agreement  with the form of  Exhibit  A that is  attached  to this
 amendment as Exhibit C.

                  Section 11. Inconsistent  Provisions.  Nothing to the contrary
 contained  in the  Partnership  Agreement  shall  limit  any of the  rights  or
 obligations set forth in this Amendment.

                  IN WITNESS WHEREOF, this Amendment has been executed as of the
 date first above written.

                                              PS BUSINESS PARKS, INC.


                                              By:    /s/ Jack E. Corrigan  
                                                         -----------------------
                                                         Name: Jack E. Corrigan
                                              Title:     Chief Financial Officer






                             PS BUSINESS PARKS, INC.
           Exhibit 11: Statement re: Computation of Earnings per Share

<TABLE>
<CAPTION>

                                                                 For the Three Months Ended
                                                                          March 31,
                                                                 --------------------------
Basic and Diluted Earnings Per Share:                                1999            1998
                                                                 ----------      ----------    
<S>                                                              <C>             <C>

Net income and net income  allocable  to common  shareholders
   (same for Basic and Diluted computations)                     $9,442,000      $4,330,000
                                                                 ==========      ==========
Weighted average common shares outstanding:

   Basic weighted average common shares outstanding.....         23,637,000      11,314,000
   Net effect of dilutive  stock  options - based on treasury
     stock method using average market price............             68,000          43,000
                                                                 ----------      ---------- 

   Diluted weighted average common shares outstanding...         23,705,000      11,357,000
                                                                 ==========      ==========    
Basic earnings per common share.........................         $     0.40      $     0.38
                                                                 ==========      ==========         
Diluted earnings per common share.......................         $     0.40      $     0.38
                                                                 ==========      ==========
</TABLE>

                                   Exhibit 11




                             PS BUSINESS PARKS, INC.
                      Exhibit 12: Statement re: Computation
                     of Ratio of Earnings to Fixed Charges


<TABLE>
<CAPTION>
                                                                             Three Months Ended
                                                                                  March 31,
                                                                   ---------------------------------------   
                                                                        1999                     1998
                                                                   --------------           --------------   
                                                                    (Amounts in thousands, except ratios)

<S>                                                                <C>                      <C>  
      Net income............................................       $    9,442,000           $   4,330,000
      Minority interest.....................................            2,966,000               2,814,000
      Interest expense......................................              909,000                 247,000
                                                                   --------------           -------------      
      Earnings available to cover fixed charges.............       $   13,317,000           $   7,391,000
                                                                   ==============           =============      
      Fixed charges (1).....................................       $    1,094,000           $     247,000
                                                                   ==============           ============= 
      Ratio of earnings to fixed charges....................                12.17                   29.92
                                                                   ==============           =============      
</TABLE>
<TABLE>
<CAPTION>
                                                                   Years Ended December 31,
                                        ------------------------------------------------------------------------------
                                             1998             1997            1996             1995            1994
                                        ------------     ------------    ------------     ------------    ------------ 
<S>                                     <C>              <C>             <C>              <C>             <C>    
Net income.........................     $ 29,400,000     $  3,836,000    $    519,000     $  1,192,000    $  1,245,000
Minority interest..................       11,208,000        8,566,000               -                -               -
Interest expense...................        2,361,000            1,000               -                -               -
                                        ------------     ------------    ------------     ------------    ------------
Earnings available to cover fixed
   charges.........................     $ 42,969,000     $ 12,403,000    $    519,000    $   1,192,000    $  1,245,000
                                        ============     ============    ============    =============    ============
Fixed charges (1)..................     $  2,629,000     $      1,000    $          -     $          -    $          -
                                        ============     ============    ============    =============    ============
Ratio of earnings to fixed charges.            16.34           12,403         N/A             N/A              N/A
                                        ============     ============    ============    =============    ============

</TABLE>

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

                                   Exhibit 12

<PAGE>

                             PS BUSINESS PARKS, INC.
           Exhibit 12: Statement re: Computation of Ratio of Earnings
                                to Fixed Charges


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

<TABLE>
<CAPTION>

                                                                             Three Months Ended
                                                                                  March 31,
                                                                        1999                     1998
                                                                    (Amounts in thousands, except ratios)

<S>                                                                <C>                     <C>
      FFO...................................................       $   18,390,000               $9,444,000
      Interest expense......................................              909,000                  247,000
                                                                   --------------          ---------------
      Adjusted FFO available to cover fixed charges.........       $   19,299,000          $     9,691,000
                                                                   ==============          ===============

      Fixed charges (1).....................................       $    1,094,000          $       247,000
                                                                   ==============          ===============
      Ratio of FFO to fixed charges.........................                17.64                    39.23
                                                                   ==============          ===============
</TABLE>
<TABLE>
<CAPTION>
                                                                   Years Ended December 31,
                                        ------------------------------------------------------------------------------
                                            1998             1997            1996             1995            1994
                                        ------------     ------------    ------------     ------------    ------------
<S>                                     <C>              <C>             <C>              <C>             <C> 
FFO................................     $ 57,430,000     $ 17,597,000    $    303,000     $    720,000    $    757,000
Interest expense...................        2,361,000            1,000               -                -               -
                                        ------------     ------------    ------------     ------------    ------------
Adjusted   FFO   available  to  cover
   fixed charges...................     $ 59,791,000     $ 17,598,000    $    303,000     $    720,000    $    757,000
                                        ============     ============    ============     ============    ============
Fixed charges (1)..................     $  2,629,000     $      1,000    $          -     $          -    $          -
                                        ============     ============    ============     ============    ============
Ratio of FFO to fixed charges......            22.74           17,598         N/A             N/A              N/A
                                        ============     ============    ============     ============    ============

</TABLE>


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

                                   Exhibit 12

<TABLE> <S> <C>


<ARTICLE>                     5
<CIK>                         0000866368
<NAME>                                 PS Business Parks, Inc.
<MULTIPLIER>                                                 1
<CURRENCY>                                              U.S. $
       
<S>                                                        <C>
<PERIOD-TYPE>                                            3-MOS
<FISCAL-YEAR-END>                                  DEC-31-1999
<PERIOD-START>                                     JAN-01-1999
<PERIOD-END>                                       MAR-31-1999
<EXCHANGE-RATE>                                              1
<CASH>                                               1,299,000
<SECURITIES>                                                 0
<RECEIVABLES>                                                0
<ALLOWANCES>                                                 0
<INVENTORY>                                                  0
<CURRENT-ASSETS>                                     1,299,000
<PP&E>                                             739,931,000
<DEPRECIATION>                                     (29,175,000)
<TOTAL-ASSETS>                                     729,614,000
<CURRENT-LIABILITIES>                               14,050,000
<BONDS>                                                      0
                                        0
                                                  0
<COMMON>                                               236,000
<OTHER-SE>                                         492,847,000
<TOTAL-LIABILITY-AND-EQUITY>                       729,614,000
<SALES>                                                      0
<TOTAL-REVENUES>                                    29,251,000
<CGS>                                                        0
<TOTAL-COSTS>                                        8,399,000
<OTHER-EXPENSES>                                     7,535,000
<LOSS-PROVISION>                                             0
<INTEREST-EXPENSE>                                     909,000
<INCOME-PRETAX>                                      9,442,000
<INCOME-TAX>                                                 0
<INCOME-CONTINUING>                                  9,442,000
<DISCONTINUED>                                               0
<EXTRAORDINARY>                                              0
<CHANGES>                                                    0
<NET-INCOME>                                         9,442,000
<EPS-PRIMARY>                                             0.40
<EPS-DILUTED>                                             0.40
        

</TABLE>


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