COPT Defense Properties Quarterly report pursuant to Section 13 or 15(d)

Organization (Details)

Organization (Details) - Mar. 31, 2018 ft² in Thousands	a	ft²	MW	Property
Operating Properties
Investments in real estate
Number of real estate properties				159
Area of real estate property (in square feet or acres) \| ft²		17,600
Operating Properties \| Office Properties
Investments in real estate
Number of real estate properties				144
Operating Properties \| Single-tenant data centers
Investments in real estate
Number of real estate properties				15
Properties under, or contractually committed for, construction or approved for redevelopment
Investments in real estate
Number of real estate properties				7
Area of real estate property (in square feet or acres) \| ft²		619
Properties under, or contractually committed for, construction or approved for redevelopment \| Office Properties
Investments in real estate
Number of real estate properties				4
Properties under, or contractually committed for, construction or approved for redevelopment \| Single-tenant data centers
Investments in real estate
Number of real estate properties				3
Properties under, or contractually committed for, construction or approved for redevelopment \| Partially operational properties
Investments in real estate
Number of real estate properties				1
Land controlled for future development
Investments in real estate
Area of real estate property (in square feet or acres)	1,000	13,000
Other Land
Investments in real estate
Area of real estate property (in square feet or acres) \| a	150
Operating wholesale data centers
Investments in real estate
Critical load (in megawatts) \| MW			19.25
GI-COPT \| Operating Properties \| Single-tenant data centers
Investments in real estate
Number of real estate properties				6