<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
Consolidated Balance Sheet at September 30, 2000 and the Consolidated Statement
of Operations for the nine months ended September 30, 2000 and is qualified in
its entirety by reference to such financial statements.
</LEGEND>
<CIK> 0000921112
<NAME> LIBERTY PROPERTY TRUST
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                           5,388
<SECURITIES>                                         0
<RECEIVABLES>                                    6,859
<ALLOWANCES>                                     2,070
<INVENTORY>                                          0
<CURRENT-ASSETS>                                     0
<PP&E>                                       3,146,257
<DEPRECIATION>                                 321,020
<TOTAL-ASSETS>                               3,301,159
<CURRENT-LIABILITIES>                                0
<BONDS>                                      1,625,221
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                    120,814
<COMMON>                                            68
<OTHER-SE>                                   1,197,635
<TOTAL-LIABILITY-AND-EQUITY>                 3,301,159
<SALES>                                              0
<TOTAL-REVENUES>                               394,899
<CGS>                                                0
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<OTHER-EXPENSES>                                68,388
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              79,535
<INCOME-PRETAX>                                134,388
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            134,388
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                (2,103)
<CHANGES>                                            0
<NET-INCOME>                                   109,041
<EPS-BASIC>                                       1.62
<EPS-DILUTED>                                     1.60