Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Details)

v3.20.2
Subsequent Events (Details) - Subsequent Event - Data Center Shells - Disposed of by sale
$ in Millions
Oct. 30, 2020
USD ($)
property_sold
Subsequent Event [Line Items]  
Ownership percentage sold 90.00%
Number of real estate properties | property_sold 2
Consideration received from sale of ownership interest $ 90
Proceeds from sale $ 81
B RE COPT DC JV II LLC  
Subsequent Event [Line Items]  
Nominal Ownership % 10.00%