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Organization (Details) - 3 months ended Mar. 31, 2026 ft² in Millions | property | ft² | a | shares
--- | --- | --- | --- | ---
Preferred Units |  |  |  |
Investments in real estate |  |  |  |
Limited partners' capital account, units outstanding (in units) | shares |  |  |  | 0
COPT Defense Properties, L.P. | Common Units | COPT Defense Properties |  |  |  |
Investments in real estate |  |  |  |
Percentage ownership in operating partnership | 97.20% |  |  |
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 | 201 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 23.2 |  |
Operating Properties | Defense/IT Portfolio | Unconsolidated Real Estate Joint Ventures |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 24 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 4.3 |  |
Operating Properties | Other | Greater Washington, DC/Baltimore |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 6 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 2.0 |  |
Properties under development | Defense/IT Portfolio |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 7 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 1.0 |  |
Land controlled for development | Greater Washington, DC/Baltimore |  |  |  |
Investments in real estate |  |  |  |
Area of real estate property (in sqft or acres) | a |  |  | 50 |
Land controlled for development | Defense/IT Portfolio |  |  |  |
Investments in real estate |  |  |  |
Area of real estate property (in sqft or acres) |  | 10.8 | 980 |

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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482987/272-10-50-3 + Details
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- Definition The number of limited partner units outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-5 + Details
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