COPT Defense Properties Annual report pursuant to Section 13 and 15(d)

Organization (Narrative) (Details)

Organization (Narrative) (Details) - 12 months ended Dec. 31, 2022 ft² in Millions	property	ft²	a	shares
Corporate Office Properties, L.P \| Preferred units
Investments in real estate
Limited partners' capital account, units outstanding (in shares) \| shares				0
Corporate Office Properties, L.P \| COPT \| Common Units
Investments in real estate
Percentage ownership in operating partnership	98.00%
Operating properties
Investments in real estate
Number of real estate properties	194
Area of real estate property (in sqft or acres) \| ft²		23.0
Operating properties \| Office Properties
Investments in real estate
Number of real estate properties	166
Area of real estate property (in sqft or acres) \| ft²		17.7
Operating properties \| Single-tenant data centers
Investments in real estate
Number of real estate properties	28
Area of real estate property (in sqft or acres) \| ft²		5.3
Properties under development
Investments in real estate
Number of real estate properties	7
Area of real estate property (in sqft or acres) \| ft²		1.0
Properties under development \| Office Properties
Investments in real estate
Number of real estate properties	5
Properties under development \| Single-tenant data centers
Investments in real estate
Number of real estate properties	2
Properties Under Development, Partially-Operational
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 sqft or acres)		9.5	710
Other land
Investments in real estate
Area of real estate property (in sqft or acres) \| a			43
Unconsolidated Real Estate Joint Ventures
Investments in real estate
Number of real estate properties	21
Unconsolidated Real Estate Joint Ventures \| Operating properties \| Single-tenant data centers
Investments in real estate
Number of real estate properties	21