Quarterly report pursuant to Section 13 or 15(d)

Organization (Details)

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Organization (Details) - 3 months ended Mar. 31, 2024
ft² in Thousands
property
ft²
a
shares
COPT Defense Properties | Preferred Units        
Investments in real estate        
Limited partners' capital account, units outstanding (in units) | shares       0
COPT Defense Properties, L.P. | COPT Defense Properties | Common Units | COPT Defense Properties        
Investments in real estate        
Percentage ownership in operating partnership 97.50%      
Unconsolidated Real Estate Joint Ventures        
Investments in real estate        
Number of real estate properties 24      
Operating Properties | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 193      
Area of real estate property (in sqft or acres) | ft²   22,000    
Operating Properties | Greater Washington, DC/Baltimore | Other        
Investments in real estate        
Number of real estate properties 8      
Area of real estate property (in sqft or acres) | ft²   2,100    
Operating Properties | Office Properties | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 163      
Area of real estate property (in sqft or acres) | ft²   16,300    
Operating Properties | Single-tenant data centers | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 30      
Area of real estate property (in sqft or acres) | ft²   5,700    
Operating Properties | Single-tenant data centers | Unconsolidated Real Estate Joint Ventures | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 24      
Properties under development | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 6      
Area of real estate property (in sqft or acres) | ft²   959    
Properties under development | Office Properties | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 3      
Properties under development | Single-tenant data centers | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 3      
Properties under development, partially operational | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 1      
Land controlled for development | Defense/IT Portfolio        
Investments in real estate        
Area of real estate property (in sqft or acres)   7,700 650  
Land controlled for development | Greater Washington, DC/Baltimore | Other        
Investments in real estate        
Area of real estate property (in sqft or acres) | a     50