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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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 properties |  | Shorter 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,
| 2024 |  | 2023
Land | $ | 495,707 |  |  | $ | 482,964 |
Buildings and improvements | 4,395,063 |  |  | 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 Type |  | Amortization Period |  | Statement of Operations Location
Above- and below-market leases |  | Related lease terms |  | Lease revenue
In-place lease value |  | Related lease terms |  | Depreciation and amortization associated with real estate operations
Tenant relationship value |  | Estimated period of time that tenant will lease space in property |  | Depreciation and amortization associated with real estate operations
Schedule of Intangible Assets | Intangible assets on property acquisitions consisted of the following (in thousands):
|  | December 31, 2024 |  | December 31, 2023
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
In-place lease value |  | $ | 124,806 |  |  | $ | 121,091 |  |  | $ | 3,715 |  |  | $ | 124,884 |  |  | $ | 121,424 |  |  | $ | 3,460 |
Tenant relationship value |  | 53,788 |  |  | 48,008 |  |  | 5,780 |  |  | 53,953 |  |  | 50,987 |  |  | 2,966 |
Above-market leases |  | 14,865 |  |  | 13,914 |  |  | 951 |  |  | 13,718 |  |  | 13,558 |  |  | 160 |
Other |  | 1,333 |  |  | 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,
|  | 2024 |  | 2023 |  | 2022
Ordinary income |  | 100.0 | % |  | 51.0 | % |  | 68.2 | %
Long-term capital gain |  | — | % |  | 49.0 | % |  | 31.8 | %
Return of capital |  | — | % |  | — | % |  | — | %

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