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Real Estate Joint Ventures - Investments in Unconsolidated Real Estate Joint Ventures (Details) $ in Thousands | Mar. 31, 2026 USD ($) property | Dec. 31, 2025 USD ($)
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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 | $ 11,805 | $ 13,525
Unconsolidated Real Estate Joint Ventures | Investment in unconsolidated real estate joint ventures |  |
Schedule of Equity Method Investments [Line Items] |  |
Carrying Value of Investment | 35,800 | 36,400
Unconsolidated Real Estate Joint Ventures | Other liabilities |  |
Schedule of Equity Method Investments [Line Items] |  |
Carrying Value of Investment | $ (24,000) | (22,800)
Redshift JV LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Nominal Ownership % | 10.00% |
Number of Properties | property | 3 |
Carrying Value of Investment | $ 20,196 | 20,767
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 | $ 8,970 | 8,941
Quark JV LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Nominal Ownership % | 10.00% |
Number of Properties | property | 2 |
Carrying Value of Investment | $ 6,652 | 6,660
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 | $ (707) | (600)
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 | $ (23,306) | (22,243)
Difference between the joint venture's lower cost basis and the entity's share of underlying equity in the net assets | $ 6,400 | $ 6,500

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