Annual report pursuant to Section 13 and 15(d)

Organization (Details)

v3.6.0.2
Organization (Details)
ft² in Thousands
Dec. 31, 2016
a
ft²
Property
MW
Properties under redevelopment [Member]  
Investments in real estate  
Number of real estate properties 3
Square footage of real estate properties (in square feet) | ft² 104
Operating office properties [Member]  
Investments in real estate  
Number of real estate properties 164
Square footage of real estate properties (in square feet) | ft² 17,200
Operating office properties [Member] | Single-tenant data centers [Member]  
Investments in real estate  
Number of real estate properties 13
Office properties under, or contractually committed for, construction or approved for redevelopment [Member]  
Investments in real estate  
Number of real estate properties 11
Square footage of real estate properties (in square feet) | ft² 1,400
Office properties under, or contractually committed for, construction or approved for redevelopment [Member] | Properties completed Held-for-future lease [Member]  
Investments in real estate  
Number of real estate properties 2
Partially operational properties [Member] | Properties under redevelopment [Member]  
Investments in real estate  
Number of real estate properties 3
Land controlled for future development [Member]  
Investments in real estate  
Square footage of real estate properties (in square feet) | a 1,028
Developable square footage of real estate properties (in square feet) | ft² 12,200
Other land [Member]  
Investments in real estate  
Square footage of real estate properties (in square feet) | a 199
Operating wholesale data centers [Member]  
Investments in real estate  
Critical load (in MW's) | MW 19.25
GI-COPT [Member] | Operating office properties [Member] | Single-tenant data centers [Member]  
Investments in real estate  
Number of real estate properties 6