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

Organization (Details)

Organization (Details) ft² in Thousands	Sep. 30, 2016 a ft² Property MW
Properties under or approved for redevelopment
Investments in real estate
Number of real estate properties	3
Area of real estate property (in square feet or acres) \| ft²	104
Operating office properties
Investments in real estate
Number of real estate properties	168
Area of real estate property (in square feet or acres) \| ft²	17,500
Operating office properties \| Single-tenant data centers
Investments in real estate
Number of real estate properties	12
Operating office properties \| Single-tenant data centers \| Unconsolidated Joint Venture
Investments in real estate
Number of real estate properties	6
Office properties under, or contractually committed for, construction or approved for redevelopment
Investments in real estate
Number of real estate properties	10
Area of real estate property (in square feet or acres) \| ft²	1,200
Office properties under, or contractually committed for, construction or approved for redevelopment \| Properties completed Held-for-future lease
Investments in real estate
Number of real estate properties	2
Partially operational properties \| Properties under or approved for redevelopment
Investments in real estate
Number of real estate properties	2
Land controlled for future development
Investments in real estate
Area of real estate property (in square feet or acres) \| a	1,358
Developable square feet \| ft²	16,200
Operating wholesale data centers
Investments in real estate
Critical load (in megawatts) \| MW	19.25