<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-31-1998
 <PERIOD-START>                                                 JAN-01-1998
 <PERIOD-END>                                                   SEP-30-1998
 <EXCHANGE-RATE>                                                          1
 <CASH>                                                          32,747,000
 <SECURITIES>                                                             0
 <RECEIVABLES>                                                            0
 <ALLOWANCES>                                                             0
 <INVENTORY>                                                              0
 <CURRENT-ASSETS>                                                32,747,000
 <PP&E>                                                         659,798,000
 <DEPRECIATION>                                                (15,104,000)
 <TOTAL-ASSETS>                                                 683,431,000
 <CURRENT-LIABILITIES>                                           13,794,000
 <BONDS>                                                                  0
 <PREFERRED-MANDATORY>                                                    0
 <PREFERRED>                                                              0
 <COMMON>                                                           236,000
 <OTHER-SE>                                                     487,158,000
 <TOTAL-LIABILITY-AND-EQUITY>                                   683,431,000
 <SALES>                                                                  0
 <TOTAL-REVENUES>                                                62,976,000
 <CGS>                                                                    0
 <TOTAL-COSTS>                                                   18,410,000
 <OTHER-EXPENSES>                                                14,746,000
 <LOSS-PROVISION>                                                         0
 <INTEREST-EXPENSE>                                               1,736,000
 <INCOME-PRETAX>                                                 21,124,000
 <INCOME-TAX>                                                             0
 <INCOME-CONTINUING>                                             21,124,000
 <DISCONTINUED>                                                           0
 <EXTRAORDINARY>                                                          0
 <CHANGES>                                                                0
 <NET-INCOME>                                                    21,124,000
 <EPS-PRIMARY>                                                         1.18
 <EPS-DILUTED>                                                         1.17