<ARTICLE>                     5
<LEGEND>


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

       </LEGEND>
       <CIK>                                                        0000866368
       <NAME>                                           PS Business Parks, Inc.
       <MULTIPLIER>                                                           1
       <CURRENCY>                                                        U.S. $

                                                                         
       <PERIOD-TYPE>                                                      9-MOS
       <FISCAL-YEAR-END>                                            DEC-31-2000
       <PERIOD-START>                                               JAN-01-2000
       <PERIOD-END>                                                 SEP-30-2000
       <EXCHANGE-RATE>                                                        1
       <CASH>                                                        56,613,000
       <SECURITIES>                                                  26,475,000
       <RECEIVABLES>                                                    528,000
       <ALLOWANCES>                                                           0
       <INVENTORY>                                                            0
       <CURRENT-ASSETS>                                                       0
       <PP&E>                                                       885,891,000
       <DEPRECIATION>                                               (75,003,000)
       <TOTAL-ASSETS>                                               923,518,000
       <CURRENT-LIABILITIES>                                         27,016,000
       <BONDS>                                                                0
       <PREFERRED-MANDATORY>                                                  0
       <PREFERRED>                                                   55,000,000
       <COMMON>                                                         231,000
       <OTHER-SE>                                                   505,613,000
       <TOTAL-LIABILITY-AND-EQUITY>                                 923,518,000
       <SALES>                                                                0
       <TOTAL-REVENUES>                                             112,340,000
       <CGS>                                                                  0
       <TOTAL-COSTS>                                                 29,651,000
       <OTHER-EXPENSES>                                              29,582,000
       <LOSS-PROVISION>                                                       0
       <INTEREST-EXPENSE>                                             1,246,000
       <INCOME-PRETAX>                                               33,726,000
       <INCOME-TAX>                                                           0
       <INCOME-CONTINUING>                                           33,726,000
       <DISCONTINUED>                                                         0
       <EXTRAORDINARY>                                                        0
       <CHANGES>                                                              0
       <NET-INCOME>                                                  33,726,000
       <EPS-BASIC>                                                         1.28
       <EPS-DILUTED>                                                       1.28