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Real Estate Joint Ventures - Unconsolidated Real Estate Joint Ventures (Details) $ in Thousands | Dec. 31, 2024 USD ($) property | Dec. 31, 2023 USD ($) | Jan. 10, 2023 | Dec. 14, 2022
--- | --- | --- | --- | ---
Unconsolidated Real Estate Joint Ventures |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of Properties | property | 24 |  |  |
Carrying Value of Investment | $ 35,951 | $ 38,275 |  |
Unconsolidated Real Estate Joint Ventures | Investment in unconsolidated real estate joint ventures |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Carrying Value of Investment | 39,400 | 41,100 |  |
Unconsolidated Real Estate Joint Ventures | Other liabilities |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Carrying Value of Investment | $ (3,400) | (2,800) |  |
Redshift |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Nominal Ownership % | 10.00% |  | 10.00% |
Number of Properties | property | 3 |  |  |
Carrying Value of Investment | $ 20,921 | 21,053 |  |
BREIT COPT DC JV LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Nominal Ownership % | 10.00% |  |  |
Number of Properties | property | 9 |  |  |
Carrying Value of Investment | $ 9,584 | 10,629 |  |
Quark |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Nominal Ownership % | 10.00% |  |  | 10.00%
Number of Properties | property | 2 |  |  |
Carrying Value of Investment | $ 6,706 | 6,727 |  |
B RE COPT DC JV III LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Nominal Ownership % | 10.00% |  |  |
Number of Properties | property | 2 |  |  |
Carrying Value of Investment | $ 2,149 | 2,643 |  |
B RE COPT DC JV II LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Nominal Ownership % | 10.00% |  |  |
Number of Properties | property | 8 |  |  |
Carrying Value of Investment | $ (3,409) | (2,777) |  |
Difference between the joint venture's lower cost basis and the entity's share of underlying equity in the net assets | $ 6,700 | $ 6,800 |  |

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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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