Quarterly report pursuant to Section 13 or 15(d)

Real Estate - Properties Sold and Held for Sale (Details)

v3.21.2
Real Estate - Properties Sold and Held for Sale (Details)
ft² in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 22, 2021
USD ($)
ft²
property
Jul. 26, 2021
USD ($)
ft²
property
Dec. 17, 2020
USD ($)
ft²
Dec. 02, 2020
USD ($)
ft²
Apr. 21, 2020
USD ($)
ft²
Sep. 30, 2021
USD ($)
ft²
property
Dec. 31, 2020
USD ($)
ft²
Properties Sold and Held for Sale [Line Items]              
Gain (loss) on sale of real estate   $ (11,200)          
Office              
Properties Sold and Held for Sale [Line Items]              
Number of properties held for sale | property   12       12  
Retail              
Properties Sold and Held for Sale [Line Items]              
Number of properties held for sale | property 8         8  
2021 Properties | Disposal group              
Properties Sold and Held for Sale [Line Items]              
Rentable Square Feet (sq ft) | ft²           3,063  
Contract Sales Price           $ 934,314  
Gain (loss) on sale of real estate           $ 46,441  
2021 Properties | Disposal group | Office Portfolio | Office              
Properties Sold and Held for Sale [Line Items]              
Rentable Square Feet (sq ft) | ft²   2,370          
Contract Sales Price   $ 766,000          
Gain (loss) on sale of real estate   $ (11,220)          
2021 Properties | Disposal group | Retail Profile | Retail              
Properties Sold and Held for Sale [Line Items]              
Rentable Square Feet (sq ft) | ft² 693            
Contract Sales Price $ 168,314            
Gain (loss) on sale of real estate $ 57,661            
2020 Properties | Disposal group              
Properties Sold and Held for Sale [Line Items]              
Rentable Square Feet (sq ft) | ft²             565
Contract Sales Price             $ 163,500
Gain (loss) on sale of real estate             $ (14,325)
2020 Properties | Disposal group | John Marshall II | Office              
Properties Sold and Held for Sale [Line Items]              
Rentable Square Feet (sq ft) | ft²         223    
Contract Sales Price         $ 57,000    
Gain (loss) on sale of real estate         $ (6,855)    
2020 Properties | Disposal group | Monument II | Office              
Properties Sold and Held for Sale [Line Items]              
Rentable Square Feet (sq ft) | ft²       207      
Contract Sales Price       $ 53,000      
Gain (loss) on sale of real estate       $ (8,595)      
2020 Properties | Disposal group | 1227 25th Street | Office              
Properties Sold and Held for Sale [Line Items]              
Rentable Square Feet (sq ft) | ft²     135        
Contract Sales Price     $ 53,500        
Gain (loss) on sale of real estate     $ 1,125