Exhibit 21 PREIT's Subsidiaries We conduct substantially all of our real estate ownership activities through PREIT Associates, L.P., a Delaware limited partnership, of which we are the sole general partner and 90.7% owner. PREIT Associates and/or its affiliates own an interest in the following partnerships: Aggregate Names of Partnership State of Organization Percentage Owned* - -------------------- --------------------- ---------------- Bailey Associates PA 50% Cambridge Apartments PA 50 Countrywood Apartments Limited Partnership FL 50 Eagles Nest Associates FL 100 Forestville Plaza Shopping Center Limited Partnership MD 100 Fox Run Apartments PA 50 Fox Run Del Associates DE 100 GP Stones Limited Partnership FL 100 Mall Corners Ltd. GA 19 Mall Corner II, Ltd. GA 11 Jacksonville Associates FL 100 Laurel Mall Associates PA 40 Lehigh Valley Associates PA 50 MC Associates FL 100 New Regency Hilltop Associates VA 65 Oxford Valley Road Associates PA 50 Palmer Park Mall Venture PA 50 PR Shenandoah Limited Partnership FL 100 PR 8000 Airport Highway, L.P. PA 100 PR 8000 National Highway, L.P. PA 100 Regency Associates NE 50 Rio Grande Venture PA 60 ALRO Associates, L.P. DE 50 PR Fox Run, L.P. PA 100 PR Laurel Mall, L.P. PA 100 PR Palmer Park, L.P. PA 100 PR Rio Mall Limited Partnership PA 100 PR Springfield Associates, L.P. PA 100 PR Warrington, L.P. PA 100 PR Will-O-Hill, L.P. PA 100 Will-O-Hill Apartments PA 50 PRGL Paxton Limited Partnership PA 100 PRDB Springfield Limited Partnership PA 50 The Woods Associates PA 100 PR Festival Limited Partnership PA 100 Roosevelt II Associates, L.P. PA 89-Capital Interest 99-Profits Interest PR Northeast Limited Partnership PA 100 Roosevelt Associates, L.P. PA 89-Capital Interest 99-Profits Interest PR Titus Limited Partnership PA 100 PR Eagles Nest L.P. DE 100 Red Rose Commons Associates, L.P. PA 50 PR Palmer Park, L.P. PA 100 Tupelo Mall AL 50(1) VLRC Associates GA 87.5(1) * By PREIT Associates, we own approximately 90.7% of PREIT Associates. (1) By us, not PREIT Associates. We own 100% of the shares of the following corporations: Names of Subsidiaries State of Organization - --------------------- --------------------- Berdel, Inc. DE Berfla, Inc. FL Burren, Inc. FL PR West Palm Inc. FL PR VA Regency Inc. VA PR Forestville Inc. MD PREIT Associates is the sole beneficiary of the following business trusts: Name of Trust State of Organization - ------------- --------------------- PR Fox Run Trust PA PR Laurel Mall Trust PA PR Metroplex Trust PA PR Northeast Trust PA PR Oxford Valley Trust PA PR Palmer Park Trust PA PR Red Rose Trust PA PR Springfield Trust PA PR Warrington Trust PA PR Will-O-Hill Trust PA Trust #7000 IL PREIT Associates has a member interest in the following limited liability companies: State of Organization Percentage Owned --------------------- ----------------- Subsidiary LLC PR Christiana LLC DE 100 PR Cobblestone LLC DE 100 PR Concord LLC DE 100 PR Countrywood LLC DE 100 PR Forestville LLC DE 100 PR Interstate Container LLC DE 100 PR Magnolia LLC DE 100 PR Mandarin Conners LLC DE 100 PR North Dartmouth Mall LLC DE 100 PR Regency Associates LLC DE 100 PR Rio Mall LLC DE 100 PR South Blanding LLC DE 100 PR 8000 Airport Highway LLC DE 100 PR 8000 National Highway LLC DE 100 PR Paxton LLC PA 100 PRDB Springfield LLC PA 50 PR Woods LLC PA 100 PR Festival LLC PA 100 PR Northeast LLC PA 100 PR Warrington LLC PA 100 PR Titus LLC PA 100 PR Berfla LLC DE 100 PR PGPlaza LLC DE 100 PR Fox Run Del LLC DE 100 PR Berdel LLC DE 100 PR Foulk Plaza LLC DE 100 PR Will-O-Hill LLC PA 100 CD Development LLC DE 100 PR Prince George's Plaza LLC DE 100 PR Pembroke LLC DE 100 PR Pembroke Manager LLC DE 100 PR Red Rose LLC PA 100 PR Metroplex East LLC PA 100 PR Metroplex West LLC PA 100 PR Kenwood Gardens LLC DE 100 PR Kenwood Gardens Manager LLC DE 100 PR Marylander LLC DE 100 PR Marylander Manager LLC DE 100 PR Hidden Lakes LLC DE 100 PR Hidden Lakes Manager LLC DE 100 PR Boca Palms LLC DE 100 PR Boca Palms Manager LLC DE 100 PR Florence LLC SC 100 PREIT Associates owns all of the non-voting shares of PREIT-RUBIN, Inc., a Pennsylvania corporation, representing 95% of PREIT-RUBIN's equity. PREIT-RUBIN owns all of the shares of The Rubin Organization-Illinois, Inc., an Illinois corporation.