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Organization of the Parent Company and The Operating Partnership (Tables)
 9 Months Ended
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of Core Portfolio of Operating Properties and Excludes Development, Redevelopment and Held for Sale The Company’s core portfolio of operating properties (the “Core Properties”) excludes development properties, redevelopment properties, and properties held for sale. The Properties were comprised of the following as of September 30, 2020:
 
Number of Properties
 
Rentable Square Feet
Office properties
84

 
13,641,289

Mixed-use properties
5

 
780,184

Core Properties
89

 
14,421,473

Development property
1

 
205,803

Redevelopment properties
2

 
64,070

The Properties
92

 
14,691,346