Annual report pursuant to Section 13 and 15(d)

Organization (Details)

v3.10.0.1
Organization (Details) - Dec. 31, 2018
ft² in Millions
a
MW
ft²
Property
Operating properties [Member]        
Investments in real estate        
Number of real estate properties       163
Area of real estate property (in sqft or acres) | ft²     18.1  
Operating properties [Member] | Office Properties [Member]        
Investments in real estate        
Number of real estate properties       145
Area of real estate property (in sqft or acres) | ft²     15.1  
Operating properties [Member] | Single-tenant data centers [Member]        
Investments in real estate        
Number of real estate properties       18
Area of real estate property (in sqft or acres) | ft²     3.0  
Operating wholesale data centers [Member]        
Investments in real estate        
Critical load (in megawatts) | MW   19.25    
Properties under, or contractually committed for, construction or approved for redevelopment [Member]        
Investments in real estate        
Number of real estate properties       10
Area of real estate property (in sqft or acres) | ft²     1.3  
Properties under, or contractually committed for, construction or approved for redevelopment [Member] | Office Properties [Member]        
Investments in real estate        
Number of real estate properties       6
Properties under, or contractually committed for, construction or approved for redevelopment [Member] | Single-tenant data centers [Member]        
Investments in real estate        
Number of real estate properties       4
Properties under, or contractually committed for, construction or approved for redevelopment [Member] | Partially operational properties [Member]        
Investments in real estate        
Number of real estate properties       2
Land controlled for future development [Member]        
Investments in real estate        
Area of real estate property (in sqft or acres) 900   11.7  
Other land [Member]        
Investments in real estate        
Area of real estate property (in sqft or acres) | a 150      
GI-COPT [Member] | Operating properties [Member] | Single-tenant data centers [Member]        
Investments in real estate        
Number of real estate properties       6