Exhibit 21 LIBERTY PROPERTY TRUST LIBERTY PROPERTY LIMITED PARTNERSHIP LIST OF SUBSIDIARIES Rouse & Associates - 1655 Valley Center Parkway Limited Partnership Rouse & Associates - 300 Stonegate Drive Limited Partnership Rouse & Associates - 200 Hedgewood Drive Limited Partnership Rouse & Associates - 100 Hedgewood Drive Limited Partnership Rouse & Associates - 1495 Valley Center Parkway Limited Partnership Rouse & Associates - Great Valley Retail Limited Partnership Rouse & Associates - 300 Hedgewood Drive Limited Partnership Rouse & Associates - 420 Lapp Road Limited Partnership Rouse & Associates - 400 Hedgewood Drive Limited Partnership Rouse & Associates - 1550 Valley Center Parkway Limited Partnership Rouse & Associates - 1560 Valley Center Parkway Limited Partnership Rouse & Associates - 14 Lee Boulevard Limited Partnership 500 Chester Field Parkway Limited Partnership 300/400 Chester Field Parkway Limited Partnership Rouse & Associates - 580 Snowdrift Road Limited Partnership Rouse & Associates - 1510 Valley Center Parkway Limited Partnership Rouse & Associates - 1530 Valley Center Parkway Limited Partnership Rouse & Associates - 747 Dresher Road Limited Partnership Rouse & Associates - 200 Stonegate Drive Limited Partnership Great Valley Associates Limited Partnership Rouse & Associates - 974 Marcon Boulevard Limited Partnership Rouse & Associates - 1180 Church Road Limited Partnership Rouse & Associates - 40 Valley Stream Parkway Limited Partnership Rouse & Associates - 50 Valley Stream Parkway Limited Partnership Rouse & Associates - 20 Valley Stream Parkway Limited Partnership Rouse & Associates - 800-860 Town Center Drive Limited Partnership Rouse & Associates - 15 Great Valley Parkway Limited Partnership Morehall Associates Limited Partnership Rouse & Associates - 311 Technology Drive Limited Partnership Rouse & Associates - 55 Valley Stream Parkway Limited Partnership Rouse & Associates - 65 Valley Stream Parkway Limited Partnership Rouse & Associates - 508 Lapp Road Limited Partnership Rouse & Associates - 10 Valley Stream Parkway Limited Partnership Rouse & Associates - 333 Phoenixville Pike Limited Partnership Rouse & Associates - 964 Marcon Boulevard Limited Partnership 1566 Medical Drive Associates Limited Partnership Roble Road Associates Limited Partnership Rouse & Associates - 30 Great Valley Parkway Limited Partnership Rouse & Associates - 75 Great Valley Parkway Limited Partnership Rouse & Associates - 35 Great Valley Parkway Limited Partnership Rouse & Associates - 77 Great Valley Parkway Limited Partnership RHW Lehigh Valley Rouse & Associates - Plymouth Meeting Limited Partnership Rouse & Associates - 256 Great Valley Parkway Limited Partnership 2202 Hangar Place Associates Limited Partnership 2201 Hangar Place Associates Limited Partnership Rouse & Associates - 205 Great Valley Parkway Limited Partnership 954 Marcon Boulevard Associates Limited Partnership Rouse & Associates - 14 Great Valley Parkway Limited Partnership Rouse & Associates - XXVII Great Valley Parkway Limited Partnership Rouse & Associates - 333 Technology Drive Limited Partnership Rouse & Associates - 510 Lapp Road Limited Partnership Liberty Lehigh Partnership Liberty Special Purposes Corp. Exhibit 21 - Continued LIBERTY PROPERTY TRUST LIBERTY PROPERTY LIMITED PARTNERSHIP LIST OF SUBSIDIARIES Liberty Property Development Corp. Liberty Property Development Corp. II Liberty Property Philadelphia Corp. Liberty Property Philadelphia Trust Liberty Property Philadelphia Limited Partnership Liberty Property Philadelphia Limited Partnership II Rivers Business Commons Associates Limited Partnership