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Organization (Details)
Sep. 30, 2021
ft²
property
Jul. 29, 2021
Dec. 24, 2020
Jun. 05, 2019
Real Estate Properties        
Number of real estate properties (in properties) | property 65      
Area of real estate property (in square feet) | ft² 19,991,661      
Consolidated portfolio        
Real Estate Properties        
Number of real estate properties (in properties) | property 61      
Area of real estate property (in square feet) | ft² 17,804,923      
Consolidated portfolio | Office        
Real Estate Properties        
Number of real estate properties (in properties) | property 52      
Area of real estate property (in square feet) | ft² 14,076,114      
Consolidated portfolio | Studios        
Real Estate Properties        
Number of real estate properties (in properties) | property 3      
Area of real estate property (in square feet) | ft² 1,224,403      
Consolidated portfolio | Land        
Real Estate Properties        
Number of real estate properties (in properties) | property 6      
Area of real estate property (in square feet) | ft² 2,504,406      
Unconsolidated portfolio        
Real Estate Properties        
Number of real estate properties (in properties) | property 4      
Area of real estate property (in square feet) | ft² 2,186,738      
Unconsolidated portfolio | Joint Venture, Bentall Centre        
Real Estate Properties        
Ownership interest (percent) 20.00%     20.00%
Unconsolidated portfolio | Joint Venture Sunset Glenoaks Studios Property        
Real Estate Properties        
Ownership interest (percent) 50.00%   50.00%  
Unconsolidated portfolio | Joint Venture Waltham Cross Studios        
Real Estate Properties        
Ownership interest (percent) 35.00% 35.00%    
Unconsolidated portfolio | Office        
Real Estate Properties        
Number of real estate properties (in properties) | property 1      
Area of real estate property (in square feet) | ft² 1,495,738      
Unconsolidated portfolio | Land        
Real Estate Properties        
Number of real estate properties (in properties) | property 3      
Area of real estate property (in square feet) | ft² 691,000