<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM JUNE 30,
2000 FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000906113
<NAME> KEYSTONE PROPERTY TRUST
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               JUN-30-2000
<CASH>                                           9,847
<SECURITIES>                                         0
<RECEIVABLES>                                    7,271
<ALLOWANCES>                                         0
<INVENTORY>                                     22,465<F1>
<CURRENT-ASSETS>                                     0
<PP&E>                                         985,990
<DEPRECIATION>                                (32,304)
<TOTAL-ASSETS>                                 993,269
<CURRENT-LIABILITIES>                           18,446
<BONDS>                                        612,617
                          196,704<F2>
                                          3
<COMMON>                                             9
<OTHER-SE>                                     165,490
<TOTAL-LIABILITY-AND-EQUITY>                   993,269
<SALES>                                         58,785
<TOTAL-REVENUES>                                58,785
<CGS>                                           24,957
<TOTAL-COSTS>                                   24,957
<OTHER-EXPENSES>                                 2,214<F3>
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              28,632<F4>
<INCOME-PRETAX>                                      0
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                     624<F5>
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     3,606
<EPS-BASIC>                                        .39
<EPS-DILUTED>                                      .39
<FN>
<F1> Deferred items and other assets.
<F2> Minority Interest and preferred items.
<F3> Income from equity method investments and minority interest.
<F4> Interest expense and preferred items.
<F5> Gains on sale of assets.
</FN>


</TABLE>



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