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

Organization (Details) ft² in Thousands	Mar. 31, 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	179
Area of real estate property (in square feet or acres) \| ft²	18,300
Operating office properties \| Single-tenant data centers
Investments in real estate
Number of real estate properties	10
Office properties under, or contractually committed for, construction or approved for redevelopment
Investments in real estate
Number of real estate properties	11
Area of real estate property (in square feet or acres) \| ft²	1,300
Partially operational properties \| Properties under or approved for redevelopment
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) \| a	1,358
Developable square feet \| ft²	16,500
Wholesale data centers
Investments in real estate
Critical load (in megawatts) \| MW	19.25