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Organization - Narrative (Details) - 9 months ended Sep. 30, 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 units) | shares |  |  |  | 0
COPT | Corporate Office Properties, L.P. | Common Units |  |  |  |
Investments in real estate |  |  |  |
Percentage ownership in operating partnership | 98.00% |  |  |
Unconsolidated Real Estate Joint Ventures |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 19 |  |  |
Operating Properties |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 188 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 22.1 |  |
Operating Properties | Office Properties |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 161 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 17.1 |  |
Operating Properties | Single-tenant data centers |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 27 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 5.0 |  |
Operating Properties | Single-tenant data centers | Unconsolidated Real Estate Joint Ventures |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 19 |  |  |
Properties under development |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 12 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 1.9 |  |
Properties under development | Office Properties |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 9 |  |  |
Properties under development | Single-tenant data centers |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 3 |  |  |
Properties under development, partially-operational |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 1 |  |  |
Properties under development, expansions of fully operational properties |  |  |  |
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 sqft or acres) |  | 8.4 | 710 |
Other Land |  |  |  |
Investments in real estate |  |  |  |
Area of real estate property (in sqft or acres) | a |  |  | 43 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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