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Properties, Net - Narrative (Details) ft² in Thousands, $ in Millions | Jun. 02, 2021 USD ($) property | Jun. 30, 2021 ft² property
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B RE COPT DC JV III LLC |  |
Real Estate [Line Items] |  |
Nominal Ownership % | 10.00% | 10.00%
Number of real estate properties |  | 2
Disposed of by sale | Data Center Shells in Northern Virginia |  |
Real Estate [Line Items] |  |
Ownership percentage sold | 90.00% |
Number of real estate properties sold | 2 |
Transaction value | $ | $ 118.8 |
Proceeds from sale | $ | 106.9 |
Gain on sale of ownership interest | $ | $ 40.3 |
Newly developed properties placed in service |  |
Real Estate [Line Items] |  |
Area of real estate property (in sqft or acres) | ft² |  | 243
Number of real estate properties |  | 4
Properties under development |  |
Real Estate [Line Items] |  |
Area of real estate property (in sqft or acres) | ft² |  | 1,900
Number of real estate properties |  | 13
Properties under development, partially-operational |  |
Real Estate [Line Items] |  |
Number of real estate properties |  | 3
Properties Under Redevelopment |  |
Real Estate [Line Items] |  |
Area of real estate property (in sqft or acres) | ft² |  | 57
Number of real estate properties |  | 1

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