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

Organization (Details)

Organization (Details) - 9 months ended Sep. 30, 2023 ft² in Thousands	property	ft²	a	shares
COPT Defense Properties, L.P. \| Preferred Units
Investments in real estate
Limited partners' capital account, units outstanding (in units) \| shares				0
CDP \| COPT Defense Properties, L.P. \| Common Units
Investments in real estate
Percentage ownership in operating partnership	97.90%
Unconsolidated Real Estate Joint Ventures
Investments in real estate
Number of real estate properties	24
Operating Properties \| Defense/IT Portfolio
Investments in real estate
Number of real estate properties	188
Area of real estate property (in sqft or acres) \| ft²		21,300
Operating Properties \| Greater Washington, DC/Baltimore \| Other
Investments in real estate
Number of real estate properties	8
Area of real estate property (in sqft or acres) \| ft²		2,100
Operating Properties \| Office Properties \| Defense/IT Portfolio
Investments in real estate
Number of real estate properties	159
Area of real estate property (in sqft or acres) \| ft²		15,800
Operating Properties \| Single-tenant data centers \| Defense/IT Portfolio
Investments in real estate
Number of real estate properties	29
Area of real estate property (in sqft or acres) \| ft²		5,500
Operating Properties \| Single-tenant data centers \| Unconsolidated Real Estate Joint Ventures \| Defense/IT Portfolio
Investments in real estate
Number of real estate properties	24
Properties under development \| Defense/IT Portfolio
Investments in real estate
Number of real estate properties	6
Area of real estate property (in sqft or acres) \| ft²		971
Properties under development \| Office Properties \| Defense/IT Portfolio
Investments in real estate
Number of real estate properties	3
Properties under development \| Single-tenant data centers \| Defense/IT Portfolio
Investments in real estate
Number of real estate properties	3
Land controlled for development \| Defense/IT Portfolio
Investments in real estate
Area of real estate property (in sqft or acres)		8,100	670
Land controlled for development \| Greater Washington, DC/Baltimore \| Other
Investments in real estate
Area of real estate property (in sqft or acres) \| a			50