<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>                                               6-MOS
       <FISCAL-YEAR-END>                                     DEC-31-1999
       <PERIOD-START>                                        JAN-01-1999
       <PERIOD-END>                                          JUN-30-1999
       <EXCHANGE-RATE>                                                 1
       <CASH>                                                 13,697,000
       <SECURITIES>                                                    0
       <RECEIVABLES>                                                   0
       <ALLOWANCES>                                                    0
       <INVENTORY>                                                     0
       <CURRENT-ASSETS>                                       13,697,000
       <PP&E>                                                783,427,000
       <DEPRECIATION>                                       (36,413,000)
       <TOTAL-ASSETS>                                        784,622,000
       <CURRENT-LIABILITIES>                                  19,392,000
       <BONDS>                                                         0
       <PREFERRED-MANDATORY>                                           0
       <PREFERRED>                                            55,000,000
       <COMMON>                                                  236,000
       <OTHER-SE>                                            495,486,000
       <TOTAL-LIABILITY-AND-EQUITY>                          784,622,000
       <SALES>                                                         0
       <TOTAL-REVENUES>                                       60,499,000
       <CGS>                                                           0
       <TOTAL-COSTS>                                          17,077,000
       <OTHER-EXPENSES>                                       15,644,000
       <LOSS-PROVISION>                                                0
       <INTEREST-EXPENSE>                                      1,681,000
       <INCOME-PRETAX>                                        19,697,000
       <INCOME-TAX>                                                    0
       <INCOME-CONTINUING>                                    19,697,000
       <DISCONTINUED>                                                  0
       <EXTRAORDINARY>                                                 0
       <CHANGES>                                                       0
       <NET-INCOME>                                           19,697,000
       <EPS-BASIC>                                                0.80
       <EPS-DILUTED>                                                0.79