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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2024
Accounting Policies [Abstract]  
Schedule of 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 consisted of the following (in thousands): 
December 31,
20242023
Land$495,707 $482,964 
Buildings and improvements4,395,063 4,164,004 
Less: Accumulated depreciation(1,537,293)(1,400,162)
Operating properties, net$3,353,477 $3,246,806 
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 Intangible Assets
Intangible assets on property acquisitions consisted of the following (in thousands):
December 31, 2024December 31, 2023
Gross Carrying AmountAccumulated AmortizationNet
 Carrying Amount		Gross Carrying AmountAccumulated AmortizationNet
Carrying Amount
In-place lease value$124,806 $121,091 $3,715 $124,884 $121,424 $3,460 
Tenant relationship value53,788 48,008 5,780 53,953 50,987 2,966 
Above-market leases14,865 13,914 951 13,718 13,558 160 
Other1,333 1,081 252 1,333 1,067 266 
$194,792 $184,094 $10,698 $193,888 $187,036 $6,852 
Schedule of Characterization of Dividends Declared on Common and Preferred shares The characterization of dividends paid on COPT Defense’s common shares during each of the last three years was as follows:
For the Years Ended December 31,
202420232022
Ordinary income100.0 %51.0 %68.2 %
Long-term capital gain— %49.0 %31.8 %
Return of capital— %— %— %