Annual report pursuant to Section 13 and 15(d)

Real Estate Joint Ventures (Narrative) (Details)

v3.22.0.1
Real Estate Joint Ventures (Narrative) (Details)
$ in Thousands, ft² in Millions
12 Months Ended
Dec. 22, 2020
USD ($)
property
Dec. 31, 2021
USD ($)
ft²
property
Dec. 31, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
property
Jun. 02, 2021
Dec. 21, 2020
Oct. 30, 2020
Investments in real estate joint ventures              
Ownership percentage sold   90.00% 90.00% 90.00%      
Number of properties sold | property   2 2 9      
Gain on sale of investment in unconsolidated real estate joint venture   $ 0 $ 29,416 $ 0      
BRE-COPT 2              
Investments in real estate joint ventures              
Nominal Ownership % 10.00% 10.00% 10.00%       10.00%
BREIT-COPT              
Investments in real estate joint ventures              
Nominal Ownership %   10.00%   10.00%      
BRE-COPT 3              
Investments in real estate joint ventures              
Nominal Ownership %   10.00%     10.00%    
GI-COPT DC Partnership LLC              
Investments in real estate joint ventures              
Ownership interest sold of the original 50% owned 80.00%            
Nominal Ownership %           50.00%  
Proceeds from sale of investment in unconsolidated real estate joint venture $ 60,000            
Gain on sale of investment in unconsolidated real estate joint venture $ 29,400            
LW Redstone Company, LLC              
Investments in real estate joint ventures              
Partner's capital account upon formation   $ 9,000          
Percentage of cumulative preferred returns of cash flows on partners' invested capital   13.50%          
Percentage of cumulative preferred returns of cash flows on our invested capital   13.50%          
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company   85.00%          
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the entity's partners   15.00%          
Number of years following construction commencement threshold achievement before partner's interest can be purchased at fair value   5 years          
Construction commencement threshold (in square feet) | ft²   4.4          
Construction commencement completed (in sqft) | ft²   2.3          
LW Redstone Company, LLC | Maximum              
Investments in real estate joint ventures              
Infrastructure costs anticipated to be funded by entity for reimbursement by the City of Huntsville (in dollars)   $ 76,000          
LW Redstone Company, LLC | Notes receivable from the City of Huntsville              
Investments in real estate joint ventures              
Infrastructure costs funded to date for reimbursement by the City of Huntsville   68,100          
Stevens Investors, LLC | Construction Loan              
Investments in real estate joint ventures              
Related party transaction, amounts of transaction   112,000          
Loans and leases receivable, related parties   $ 92,200          
Stevens Investors, LLC | Construction Loan | London Interbank Offered Rate (LIBOR)              
Investments in real estate joint ventures              
Related party transaction, rate   2.35%          
Stevens Investors, LLC | Maximum              
Investments in real estate joint ventures              
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company   85.00%          
Stevens Investors, LLC | Minimum              
Investments in real estate joint ventures              
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company   60.00%          
M Square Associates, LLC              
Investments in real estate joint ventures              
Percentage of residual amounts distributed to each member   50.00%          
GI-COPT DC Partnership LLC | BRE-COPT 2              
Investments in real estate joint ventures              
Number of properties sold | property 6