Exhibit 21



|                                                  |  |                             
|------------------------------------------------- |  | ----------------------------
|Limited Partnerships                              |  | Jurisdiction of Organization
|801 Developers, LP                                |  | Pennsylvania                
|801-Gallery Associates, L.P.                      |  | Pennsylvania                
|801-Gallery C-3 Associates, L.P.                  |  | Pennsylvania                
|801-Gallery C-3 MT, L.P.                          |  | Pennsylvania                
|801-Gallery Office Associates, L.P.               |  | Pennsylvania                
|801-Gallery Office MT, L.P.                       |  | Pennsylvania                
|Bala Cynwyd Associates, LP                        |  | Pennsylvania                
|Cumberland Mall Associates                        |  | New Jersey                  
|Keystone Philadelphia Properties, LP              |  | Pennsylvania                
|Plymouth Ground Associates, LP                    |  | Pennsylvania                
|PR AEKI Plymouth, LP                              |  | Delaware                    
|PR Beaver Valley Limited Partnership              |  | Pennsylvania                
|PR Capital City Limited Partnership               |  | Pennsylvania                
|PR CC Limited Partnership                         |  | Pennsylvania                
|PR Echelon Limited Partnership                    |  | Pennsylvania                
|PR Exton Limited Partnership                      |  | Pennsylvania                
|PR Exton Square Property L.P.                     |  | Delaware                    
|PR Financing Limited Partnership                  |  | Delaware                    
|PR Gainesville Limited Partnership                |  | Delaware                    
|PR Gallery I Limited Partnership                  |  | Pennsylvania                
|PR Gallery II Limited Partnership                 |  | Pennsylvania                
|PR GV LP                                          |  | Delaware                    
|PR Holding Sub Limited Partnership                |  | Pennsylvania                
|PR Jacksonville Limited Partnership               |  | Pennsylvania                
|PR Logan Valley Limited Partnership               |  | Pennsylvania                
|PR Lycoming Limited Partnership                   |  | Pennsylvania                
|PR Monroe Old Trail Holdings LP                   |  | Pennsylvania                
|PR Monroe Old Trail LP                            |  | Pennsylvania                
|PR Monroe Unit 10C Holdings, L.P.                 |  | Pennsylvania                
|PR Monroe Unit 10C Limited Partnership            |  | Pennsylvania                
|PR Monroe 4B Holdings, L.P.                       |  | Pennsylvania                
|PR Monroe 4B Limited Partnership                  |  | Pennsylvania                
|PR Monroe Unit One Holdings, L.P.                 |  | Pennsylvania                
|PR Monroe Unit One Limited Partnership            |  | Pennsylvania                
|PR Moorestown Limited Partnership                 |  | Pennsylvania                
|PR New Castle Associates                          |  | Pennsylvania                
|PR New Garden LP                                  |  | Pennsylvania                
|PR New Garden Residential Limited Partnership     |  | Pennsylvania                
|PR New Garden/Chesco Holdings Limited Partnership |  | Pennsylvania                
|PR New Garden/Chesco Limited Partnership          |  | Pennsylvania                
|PR Northeast Whitaker Avenue, LP                  |  | Pennsylvania                
|PR Outdoor, LP                                    |  | Pennsylvania                
|PR Palmer Park Mall Limited Partnership           |  | Pennsylvania                
|PR Palmer Park, LP                                |  | Pennsylvania                
|PR Pitney Lot 3 Holdings, L.P.                    |  | Pennsylvania                
|PR Pitney Lot 3 Limited Partnership               |  | Pennsylvania                
|PR Pitney Lot 4 Holdings, L.P.                    |  | Pennsylvania                
|PR Pitney Lot 4 Limited Partnership               |  | Pennsylvania                
|PR Plymouth Meeting Associates PC LP              |  | Delaware                    
|PR Plymouth Meeting Limited Partnership           |  | Pennsylvania                
|PR PM PC Associates LP                            |  | Delaware                    
|PR Springfield Associates, LP                     |  | Pennsylvania                
|PR Springfield/Delco Holdings, LP                 |  | Pennsylvania                
|PR Springfield/Delco Limited Partnership          |  | Pennsylvania                
|PR TP LP                                          |  | Delaware                    
|PR Valley Limited Partnership                     |  | Pennsylvania                
|PR Valley View Downs Limited Partnership          |  | Pennsylvania                
|PR Valley View Limited Partnership                |  | Pennsylvania                
|PR Viewmont Limited Partnership                   |  | Pennsylvania                
|PR Washington Crown Limited Partnership           |  | Pennsylvania                



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|                                                    |  |                             
|--------------------------------------------------- |  | ----------------------------
|Limited Partnerships                                |  | Jurisdiction of Organization
|PR Westgate Limited Partnership                     |  | Pennsylvania                
|PR Woodland LP                                      |  | Delaware                    
|PR Wyoming Valley Limited Partnership               |  | Pennsylvania                
|PREIT Associates, LP                                |  | Delaware                    
|PREIT Capital Advisors, LP                          |  | Pennsylvania                
|PRGL Paxton Limited Partnership                     |  | Pennsylvania                
|WG Holdings, LP                                     |  | Pennsylvania                
|WG Park  Anchor B, LP                              |  | Delaware                    
|WG Park General, LP                                 |  | Pennsylvania                
|WG Park Limited, LP                                 |  | Pennsylvania                
|WG Park, LP                                         |  | Pennsylvania                
|                                                    | 
|Limited Liability Companies                         |  | Jurisdiction of Organization
|801 Developers GP, LLC                              |  | Pennsylvania                
|801-Gallery C-3 GP, LLC                             |  | Pennsylvania                
|801-Gallery GP, LLC                                 |  | Pennsylvania                
|801-Gallery Office GP, LLC                          |  | Pennsylvania                
|801-Tenant C-3 Manager, LLC                         |  | Pennsylvania                
|801-Tenant Office Manager, LLC                      |  | Pennsylvania                
|Beverage Two, LLC                                   |  | New Jersey                  
|Cherry Hill Center, LLC                             |  | Maryland                    
|Cumberland Mall Retail Condominium Association, LLC |  | New Jersey                  
|Echelon Beverage LLC                                |  | New Jersey                  
|Echelon Residential Unit Owner LLC                  |  | Delaware                    
|Echelon Title LLC                                   |  | Delaware                    
|Keystone Philadelphia Properties, LLC               |  | Delaware                    
|Moorestown Mall LLC                                 |  | Delaware                    
|Plymouth Ground Associates LLC                      |  | Pennsylvania                
|Plymouth License III, LLC                           |  | Pennsylvania                
|Plymouth License IV, LLC                            |  | Pennsylvania                
|PR Acquisition Sub LLC                              |  | Delaware                    
|PR Advisors GP, LLC                                 |  | Delaware                    
|PR AEKI Plymouth LLC                                |  | Delaware                    
|PR Beaver Valley LLC                                |  | Delaware                    
|PR BVM LLC                                          |  | Pennsylvania                
|PR Capital City LLC                                 |  | Delaware                    
|PR CC I LLC                                         |  | Delaware                    
|PR CC II LLC                                        |  | Delaware                    
|PR Cherry Hill Office GP, LLC                       |  | Delaware                    
|PR Cherry Hill STW LLC                              |  | Delaware                    
|PR Christiana LLC                                   |  | Delaware                    
|PR Crossroads I, LLC                                |  | Pennsylvania                
|PR Crossroads II, LLC                               |  | Pennsylvania                
|PR Cumberland GP, LLC                               |  | Delaware                    
|PR Cumberland LP, LLC                               |  | Delaware                    
|PR Cumberland Outparcel LLC                         |  | New Jersey                  
|PR Echelon LLC                                      |  | Pennsylvania                
|PR Exton LLC                                        |  | Pennsylvania                
|PR Fin Delaware, LLC                                |  | Delaware                    
|PR Financing I LLC                                  |  | Delaware                    
|PR Financing II LLC                                 |  | Delaware                    
|PR Florence LLC                                     |  | South Carolina              
|PR Francis Scott Key LLC                            |  | Delaware                    
|PR Gainesville LLC                                  |  | Delaware                    
|PR Gallery I LLC                                    |  | Pennsylvania                
|PR Gallery II, LLC                                  |  | Delaware                    
|PR GV LLC                                           |  | Delaware                    
|PR Hagerstown LLC                                   |  | Delaware                    
|PR Holding Sub LLC                                  |  | Pennsylvania                



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|                                   |  |                             
|---------------------------------- |  | ----------------------------
|Limited Liability Companies        |  | Jurisdiction of Organization
|PR Hyattsville LLC                 |  | Delaware                    
|PR Jacksonville LLC                |  | Delaware                    
|PR JK LLC                          |  | Delaware                    
|PR Lehigh Valley LLC               |  | Pennsylvania                
|PR Logan Valley LLC                |  | Delaware                    
|PR LV LLC                          |  | Delaware                    
|PR Lycoming LLC                    |  | Delaware                    
|PR Magnolia LLC                    |  | Delaware                    
|PR Metroplex West, LLC             |  | Delaware                    
|PR Monroe Old Trail Holdings LLC   |  | Delaware                    
|PR Monroe Old Trail LLC            |  | Delaware                    
|PR Monroe Unit 10C GP, LLC         |  | Delaware                    
|PR Monroe Unit 4B GP, LLC          |  | Delaware                    
|PR Monroe Unit One GP, LLC         |  | Delaware                    
|PR Moorestown LLC                  |  | Pennsylvania                
|PR New Castle LLC                  |  | Pennsylvania                
|PR New Garden LLC                  |  | Pennsylvania                
|PR New Garden Residential LLC      |  | Delaware                    
|PR New Garden/Chesco Holdings LLC  |  | Delaware                    
|PR New Garden/Chesco LLC           |  | Delaware                    
|PR North Dartmouth LLC             |  | Delaware                    
|PR Northeast LLC                   |  | Pennsylvania                
|PR Northeast Whitaker Avenue LLC   |  | Pennsylvania                
|PR Orlando Fashion Square LLC      |  | Delaware                    
|PR Outdoor, LLC                    |  | Delaware                    
|PR Patrick Henry LLC               |  | Delaware                    
|PR Paxton LLC                      |  | Pennsylvania                
|PR PG Plaza LLC                    |  | Delaware                    
|PR Pitney Lot 3 GP, LLC            |  | Delaware                    
|PR Pitney Lot 4 GP, LLC            |  | Delaware                    
|PR Plymouth Meeting LLC            |  | Pennsylvania                
|PR PM PC Associates LLC            |  | Delaware                    
|PR Prince Georges Plaza LLC       |  | Delaware                    
|PR Radio Drive, LLC                |  | South Carolina              
|PR Red Rose LLC                    |  | Delaware                    
|PR Springfield/Delco Holdings, LLC |  | Delaware                    
|PR Springfield/Delco LLC           |  | Delaware                    
|PR Sunrise Outparcel 1, LLC        |  | New Jersey                  
|PR Sunrise Outparcel 2, LLC        |  | New Jersey                  
|PR Swedes Square, LLC              |  | Delaware                    
|PR TP LLC                          |  | Delaware                    
|PR Valley LLC                      |  | Delaware                    
|PR Valley View Downs LLC           |  | Pennsylvania                
|PR Valley View LLC                 |  | Delaware                    
|PR Viewmont LLC                    |  | Delaware                    
|PR VV LLC                          |  | Delaware                    
|PR Walnut Street Abstract LLC      |  | Delaware                    
|PR Washington Crown LLC            |  | Delaware                    
|PR WC LLC                          |  | Delaware                    
|PR Westgate LLC                    |  | Pennsylvania                
|PR Wiregrass Anchor LLC            |  | Delaware                    
|PR Wiregrass Commons LLC           |  | Delaware                    
|PR Woodland General LLC            |  | Delaware                    
|PR Woodland Outparcel LLC          |  | Delaware                    
|PR WV LLC                          |  | Delaware                    
|PR Wyoming Valley LLC              |  | Delaware                    
|PREIT CDE LLC                      |  | Pennsylvania                
|PREIT Gadsden Mall LLC             |  | Delaware                    
|PREIT Gadsden Office LLC           |  | Delaware                    



---

|                                                                |  |                             
|--------------------------------------------------------------- |  | ----------------------------
|Limited Liability Companies                                     |  | Jurisdiction of Organization
|PREIT Se+rvices, LLC                                            |  | Delaware                    
|PRWGP General, LLC                                              |  | Delaware                    
|WG Holdings of Pennsylvania, LLC                                |  | Pennsylvania                
|WG Park-Anchor B, LLC                                           |  | Delaware                    
|XGP LLC                                                         |  | Delaware                    
|                                                                | 
|General Partnership                                             |  | Jurisdiction of Organization
|                                                                | 
|None.                                                           |  |                             
|                                                                | 
|Corporations                                                    |  | Jurisdiction of Organization
|1150 Plymouth Associates Inc                                    |  | Maryland                    
|Capital City Beverage Enterprises, Inc                          |  | Maryland                    
|Cherry Hill Beverage, Inc                                       |  | Maryland                    
|Court at Oxford Valley Condominium Association                  |  | Pennsylvania                
|Exton License, Inc                                              |  | Maryland                    
|Monroe Marketplace Unit Owners Association, Inc.                |  | Pennsylvania                
|Paxton Towne Centre Unit Owners Association                     |  | Pennsylvania                
|PR GC Inc                                                       |  | Maryland                    
|PR Services Corporation                                         |  | Pennsylvania                
|PR Ventures, Inc                                                |  | Pennsylvania                
|PREIT TRS, Inc                                                  |  | Delaware                    
|PREIT-RUBIN OP, Inc                                             |  | Pennsylvania                
|PREIT-RUBIN, INC.                                               |  | Pennsylvania                
|Red Rose Commons Condominium Association                        |  | Pennsylvania                
|RUBIN II, Inc                                                   |  | Pennsylvania                
|Springhill Owners Association, Inc                              |  | Florida                     
|Springhills Northeast Quadrant Drainage Association No One, Inc |  | Florida                     
|Voorhees Town Center Condominium Association, Inc.              |  | New Jersey                  
|                                                                | 
|Trusts                                                          |  | Jurisdiction of Organization
|                                                                | 
|Pennsylvania Real Estate Investment Trust                       |  | Pennsylvania                
|PR Lycoming Service Associates                                  |  | Pennsylvania                
|PR Oxford Valley Trust                                          |  | Pennsylvania                
|PR Palmer Park Trust                                            |  | Pennsylvania                
|PR Springfield Trust                                            |  | Pennsylvania                
|PREIT Charitable Fund                                           |  | Pennsylvania                
|PREIT Protective Trust                                          |  | Pennsylvania                
|                                                                | 
|Unincorporated Associations                                     |  | Jurisdiction of Organization
|                                                                | 
|Eighth & Market Condominium Association                         |  | Pennsylvania                
|Springfield Square East Condominium Association                 |  | Pennsylvania                
|                                                                | 
|Unconsolidated Affiliates                                       |  | Jurisdiction of Organization
|                                                                | 
|Lehigh Valley Associates (limited partnership)                  |  | Pennsylvania                
|Lehigh Valley Mall GP, LLC                                      |  | Delaware                    
|Mall at Lehigh Valley, L.P.                                     |  | Delaware                    
|Mall Maintenance Corporation I                                  |  | Pennsylvania                
|Mall Maintenance Corporation II                                 |  | Pennsylvania                
|Mall Corners Ltd. (limited partnership)                         |  | Georgia                     
|Mall Corners II, Ltd. (limited partnership)                     |  | Georgia                     
|Metroplex General, Inc.                                         |  | Pennsylvania                
|Metroplex West Associates, L.P.                                 |  | Pennsylvania                
|Oxford Valley Road Associates (limited partnership)             |  | Pennsylvania                
|Pavilion East Associates, L.P.                                  |  | Pennsylvania                
|PR Northeast Limited Partnership                                |  | Pennsylvania                
|PRDB Springfield Limited Partnership                            |  | Pennsylvania                
|PRDB Springfield LLC                                            |  | Pennsylvania                
|Red Rose Commons Associates, L.P.                               |  | Pennsylvania                
|Roosevelt II Associates, L.P.                                   |  | Pennsylvania                
|Walnut Street Abstract, L.P.                                    |  | New Jersey                  
|White Hall Mall Venture (partnership)                           |  | Pennsylvania