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Nature of Business and Financial Statement Presentation (Narrative) (Details)
Dec. 31, 2020
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Property
Dec. 31, 2019
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Nture of Oerations and Financial Statements Presentation [Line Items]    
GLA   349,410
Shopping Center    
Nture of Oerations and Financial Statements Presentation [Line Items]    
Number of real estate properties | Property 393  
GLA 69,000,000  
Parent Company | BPG Sub    
Nture of Oerations and Financial Statements Presentation [Line Items]    
Ownership percentage 100.00%