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
- --------------------------------------------------------------------------------



                             PS BUSINESS PARKS, INC.

                                      INDEX



                                                                                                      Page
                                                                                                      ----   
                                                                                                   

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





                             PS BUSINESS PARKS, INC.
                      CONDENSED CONSOLIDATED BALANCE SHEETS
  




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

                                     ASSETS
                                     ------
                                                                                            
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
                                                                          ===============         =============== 


  
                             See accompanying notes.
                                        2




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



                                                               For the three months
                                                                  ended March 31,
                                                        --------------------------------
                                                              1999              1998
                                                        --------------    --------------
                                                                    

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
                                                        ==============    ==============


                            See accompanying notes.
                                       3




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




                                                                                                                                    
                                                    Preferred Stock             Common Stock                                        
                                                   Shares     Amount       Shares         Amount      Paid-in Capital    Net Income 
                                                   ------     ------     ----------     -----------   ---------------   ------------
                                                                                                        

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
                                                  ========    =======    ==========     ===========    ===============  ============




                                                                            Total
                                                   Cumulative            Shareholders'
                                                  Distributions              Equity
                                                  -------------          ------------
                                                                   

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
                                                  ============           ============


                             See accompanying notes.
                                       4


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




                                                                               For the three months ended March 31,
                                                                             --------------------------------------
                                                                                   1999                   1998
                                                                             --------------         --------------
                                                                                                 
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
                                                                             ==============         ============== 



                            See accompanying notes.
                                       5





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




                                                                               For the three months ended March 31,
                                                                             --------------------------------------
                                                                                   1999                   1998
                                                                             --------------         --------------
                                                                                                 
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




                            See accompanying notes.
                                       6




                             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
 
                             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


                             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:




                                                                                        Three Months Ended
                                                                                             March 31,
                                                                                    ----------------------------
                                                                                        1999             1998
                                                                                    ------------    ------------
                                                                                                 
     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
                                                                                    ============    ============



                                       9


                             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


                             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:



               Acquisition cost:
               -----------------
                                                          
               Issuance of common stock.........            $46,810,000
               Cash.............................                424,000
                                                            -----------
                   Total acquisition cost.......            $47,234,000
                                                            ===========




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


   The historical  operating  results of PSP11 prior to the Merger have not been
   included in PSB's historical  operating results. Pro forma data for the 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:




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



   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


                             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:



                                                                                 Accumulated
                                                Land            Buildings        Depreciation          Total
                                           ---------------   ---------------    ---------------   --------------- 
                                                                                                  

     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
                                           ===============   ===============    ===============   =============== 

 
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:

                                                                       
                              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
                                                                          ==============

   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


                             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:


                                                                                                                              
             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
                                                                                       ===========

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


                                                                        
                              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
                                                                           ==============


   
                                       13


                             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


                             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




                             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


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


         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:



                                                                  Three Months Ended March 31,
                                                                  ----------------------------    
                                                                       1999              1998            Change
                                                                  -------------      ------------      ---------  
                                                                                               
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%
                                                                    ===========        ==========       ========
   


         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:




                                    Square       Percent         Rental         Percent                        Percent
          Region                   Footage      of Total         Income         of Total          NOI         of Total
- ----------------------------     ----------     --------       -----------      --------     ----------       --------  
                                                                                              

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%
                                 ==========       ======       ===========       ======     ===========         ======


         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



                                                                           Three months ended March 31,
                                                                ----------------------------------------------- 
                                                                    1999             1998 (1)           Change
                                                                -----------        -----------          ------ 
                                                                                                
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%



(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:



                                  Revenues           Revenues     Percent            NOI               NOI          Percent
                                    1999               1998      Increase            1999             1998         Increase
                                ------------       -----------   --------         -----------      -----------     --------    
                                                                                                   
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%
                                 ===========       ===========      =====         ===========      ===========       =====         


          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



 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.




                                                                            Three months ended March 31,
                                                                           -----------------------------
                                                                                1999             1998
                                                                           ------------      ----------- 
                                                                                        
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
                                                                           ============      ===========   

          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


 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:



                                                                            Three months ended March 31,
                                                                           ------------------------------
                                                                               1999              1998
                                                                           -------------     ------------  
                                                                                          
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
                                                                           ============      ============ 

 

                                       21


          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



 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


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