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Organization (Details)
Sep. 30, 2020
ft²
property
Real Estate Properties [Line Items]  
Number of real estate properties (in properties) | property 62
Area of real estate property (in square feet) | ft² 18,776,386
Joint venture, blackstone property partners  
Real Estate Properties [Line Items]  
Ownership interest 20.00%
Consolidated portfolio  
Real Estate Properties [Line Items]  
Number of real estate properties (in properties) | property 60
Area of real estate property (in square feet) | ft² 16,839,429
Consolidated portfolio | Office  
Real Estate Properties [Line Items]  
Number of real estate properties (in properties) | property 51
Area of real estate property (in square feet) | ft² 13,383,650
Consolidated portfolio | Studios  
Real Estate Properties [Line Items]  
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 [Line Items]  
Number of real estate properties (in properties) | property 6
Area of real estate property (in square feet) | ft² 2,231,376
Unconsolidated portfolio  
Real Estate Properties [Line Items]  
Number of real estate properties (in properties) | property 2
Area of real estate property (in square feet) | ft² 1,936,957
Unconsolidated portfolio | Office  
Real Estate Properties [Line Items]  
Number of real estate properties (in properties) | property 1
Area of real estate property (in square feet) | ft² 1,486,957
Unconsolidated portfolio | Land  
Real Estate Properties [Line Items]  
Number of real estate properties (in properties) | property 1
Area of real estate property (in square feet) | ft² 450,000