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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2022
Accounting Policies [Abstract]  
Schedule of the estimated useful lives of fixed assets
We depreciate our fixed assets using the straight-line method over their estimated useful lives as follows:
Estimated Useful Lives
Buildings and building improvements
10-40 years
Land improvements
10-20 years
Tenant improvements on operating propertiesShorter of remaining useful lives of assets or related lease term
Equipment and personal property
3-10 years
Operating properties, net, excluding properties held for sale, consisted of the following (in thousands): 
December 31,
20222021
Land$539,809 $572,900 
Buildings and improvements3,986,524 3,670,133 
Less: Accumulated depreciation(1,267,434)(1,152,523)
Operating properties, net$3,258,899 $3,090,510 
Schedule of amortization of intangible assets and deferred revenue
We amortize intangible assets and deferred revenue on property acquisitions as follows:
Asset TypeAmortization PeriodStatement of Operations Location
Above- and below-market leasesRelated lease termsLease revenue
In-place lease valueRelated lease termsDepreciation and amortization associated with real estate operations
Tenant relationship valueEstimated period of time that tenant will lease space in propertyDepreciation and amortization associated with real estate operations
Schedule of characterization of dividends declared on common and preferred shares The characterization of dividends paid on COPT’s common shares during each of the last three years was as follows:
For the Years Ended December 31,
202220212020
Ordinary income68.2 %33.3 %45.1 %
Long-term capital gain31.8 %57.3 %54.9 %
Return of capital— %9.4 %— %