Quarterly report pursuant to Section 13 or 15(d)

Properties, Net - Narrative (Details)

v3.21.2
Properties, Net - Narrative (Details)
ft² in Thousands, $ in Millions
Jun. 02, 2021
USD ($)
property
Jun. 30, 2021
ft²
property
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