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Real Estate Joint Ventures - Unconsolidated Real Estate Joint Ventures (Details) $ in Thousands | Dec. 31, 2023 USD ($) property | Jan. 10, 2023 | Dec. 31, 2022 USD ($) | Dec. 14, 2022 | Jun. 02, 2021
--- | --- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment in unconsolidated real estate joint ventures | $ 41,052 |  | $ 21,460 |  |
Other liabilities | $ 18,996 |  | 18,556 |  |
Unconsolidated real estate joint ventures |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of Properties | property | 24 |  |  |  |
Carrying value of Investments | $ 38,275 |  | 20,001 |  |
Investment in unconsolidated real estate joint ventures | 41,100 |  | 21,500 |  |
Other liabilities | $ 2,800 |  | 1,500 |  |
Redshift |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Nominal Ownership % | 10.00% | 10.00% |  |  |
Number of Properties | property | 3 |  |  |  |
Carrying value of Investments | $ 21,053 |  | 0 |  |
BREIT COPT DC JV LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Nominal Ownership % | 10.00% |  |  |  |
Number of Properties | property | 9 |  |  |  |
Carrying value of Investments | $ 10,629 |  | 11,568 |  |
Quark |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Nominal Ownership % | 10.00% |  |  | 10.00% |
Number of Properties | property | 2 |  |  |  |
Carrying value of Investments | $ 6,727 |  | 6,758 |  |
BRE- COPT 3 |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Nominal Ownership % | 10.00% |  |  |  | 10.00%
Number of Properties | property | 2 |  |  |  |
Carrying value of Investments | $ 2,643 |  | 3,134 |  |
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 Investments | $ (2,777) |  | (1,459) |  |
Difference between the joint venture's cost basis and the entity's share of underlying equity in the net assets | $ 6,800 |  | $ 7,000 |  |

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