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Real Estate Joint Ventures - Investments in Unconsolidated Real Estate Joint Ventures (Details) $ in Thousands | Sep. 30, 2025 USD ($) property | Dec. 31, 2024 USD ($)
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Unconsolidated Real Estate Joint Ventures |  |
Schedule of Equity Method Investments [Line Items] |  |
Number of Properties | property | 24 |
Carrying Value of Investment | $ 13,751 | $ 35,951
Unconsolidated Real Estate Joint Ventures | Investment in unconsolidated real estate joint ventures |  |
Schedule of Equity Method Investments [Line Items] |  |
Carrying Value of Investment | 36,300 | 39,400
Unconsolidated Real Estate Joint Ventures | Other liabilities |  |
Schedule of Equity Method Investments [Line Items] |  |
Carrying Value of Investment | $ (22,600) | (3,400)
Redshift JV LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Nominal Ownership % | 10.00% |
Number of Properties | property | 3 |
Carrying Value of Investment | $ 20,804 | 20,921
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 | $ 8,830 | 9,584
Quark JV LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Nominal Ownership % | 10.00% |
Number of Properties | property | 2 |
Carrying Value of Investment | $ 6,667 | 6,706
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 | $ (493) | 2,149
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 | $ (22,057) | (3,409)
Difference between the joint venture's lower cost basis and the entity's share of underlying equity in the net assets | $ 6,500 | $ 6,700

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