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Information by Business Segment - Segment Financial Information for Our Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | $ 188,795 | $ 189,225 | $ 566,566 | $ 569,834 |
Other segment items: |  |  |  |  |
Property operating expenses | (70,356) | (68,881) | (209,311) | (199,037) |
UJV NOI allocable to COPT Defense | 1,864 | 1,844 | 5,623 | 5,319 |
Segment assets | 4,351,432 | 4,234,302 | 4,351,432 | 4,234,302 | $ 4,254,191
Reportable segments |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 180,310 | 172,563 | 535,364 | 506,311 |
Other segment items: |  |  |  |  |
Property operating expenses | (70,356) | (68,881) | (209,311) | (199,037) |
UJV NOI allocable to COPT Defense | 1,864 | 1,844 | 5,623 | 5,319 |
Total other segment items | (68,492) | (67,037) | (203,688) | (193,718) |
NOI | 111,818 | 105,526 | 331,676 | 312,593 |
Additions to long-lived assets | 30,917 | 45,573 | 76,977 | 108,047 |
Transfers from non-operating properties | 25,940 | 26,893 | 74,078 | 69,678 |
Segment assets | 3,720,879 | 3,647,455 | 3,720,879 | 3,647,455 |
Reportable segments | Defense/IT Portfolio |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 161,573 | 155,148 | 479,709 | 455,636 |
Other segment items: |  |  |  |  |
Property operating expenses | (60,580) | (58,855) | (180,706) | (169,714) |
UJV NOI allocable to COPT Defense | 1,864 | 1,844 | 5,623 | 5,319 |
Total other segment items | (58,716) | (57,011) | (175,083) | (164,395) |
NOI | 102,857 | 98,137 | 304,626 | 291,241 |
Additions to long-lived assets | 28,051 | 41,533 | 68,749 | 93,760 |
Transfers from non-operating properties | 25,798 | 26,752 | 68,937 | 67,794 |
Segment assets | 3,405,258 | 3,336,034 | 3,405,258 | 3,336,034 |
Reportable segments | Defense/IT Portfolio | Fort Meade/BW Corridor |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 81,756 | 80,757 | 247,701 | 238,012 |
Other segment items: |  |  |  |  |
Property operating expenses | (28,477) | (28,342) | (87,304) | (81,718) |
UJV NOI allocable to COPT Defense | 0 | 0 | 0 | 0 |
Total other segment items | (28,477) | (28,342) | (87,304) | (81,718) |
NOI | 53,279 | 52,415 | 160,397 | 156,294 |
Additions to long-lived assets | 12,812 | 14,101 | 30,876 | 48,370 |
Transfers from non-operating properties | 19,751 | 418 | 34,984 | 2,658 |
Segment assets | 1,460,768 | 1,450,602 | 1,460,768 | 1,450,602 |
Reportable segments | Defense/IT Portfolio | Redstone Arsenal |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 19,477 | 18,332 | 54,876 | 52,157 |
Other segment items: |  |  |  |  |
Property operating expenses | (7,250) | (6,463) | (19,704) | (17,976) |
UJV NOI allocable to COPT Defense | 0 | 0 | 0 | 0 |
Total other segment items | (7,250) | (6,463) | (19,704) | (17,976) |
NOI | 12,227 | 11,869 | 35,172 | 34,181 |
Additions to long-lived assets | 2,209 | 1,521 | 12,395 | 2,545 |
Transfers from non-operating properties | 4,806 | 25,846 | 23,428 | 60,119 |
Segment assets | 618,618 | 602,573 | 618,618 | 602,573 |
Reportable segments | Defense/IT Portfolio | NoVA Defense/IT |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 22,343 | 22,083 | 67,523 | 64,110 |
Other segment items: |  |  |  |  |
Property operating expenses | (8,891) | (9,252) | (27,838) | (27,444) |
UJV NOI allocable to COPT Defense | 0 | 0 | 0 | 0 |
Total other segment items | (8,891) | (9,252) | (27,838) | (27,444) |
NOI | 13,452 | 12,831 | 39,685 | 36,666 |
Additions to long-lived assets | 7,061 | 5,357 | 12,880 | 19,762 |
Transfers from non-operating properties | 26 | 16 | 42 | 1,011 |
Segment assets | 491,051 | 492,912 | 491,051 | 492,912 |
Reportable segments | Defense/IT Portfolio | Lackland Air Force Base |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 18,555 | 16,879 | 52,440 | 49,737 |
Other segment items: |  |  |  |  |
Property operating expenses | (10,245) | (9,160) | (28,485) | (26,645) |
UJV NOI allocable to COPT Defense | 0 | 0 | 0 | 0 |
Total other segment items | (10,245) | (9,160) | (28,485) | (26,645) |
NOI | 8,310 | 7,719 | 23,955 | 23,092 |
Additions to long-lived assets | 7 | 17,034 | 224 | 17,034 |
Transfers from non-operating properties | 0 | 0 | 0 | 9 |
Segment assets | 193,734 | 200,968 | 193,734 | 200,968 |
Reportable segments | Defense/IT Portfolio | Navy Support |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 8,727 | 8,068 | 24,945 | 24,534 |
Other segment items: |  |  |  |  |
Property operating expenses | (4,016) | (4,084) | (12,038) | (11,343) |
UJV NOI allocable to COPT Defense | 0 | 0 | 0 | 0 |
Total other segment items | (4,016) | (4,084) | (12,038) | (11,343) |
NOI | 4,711 | 3,984 | 12,907 | 13,191 |
Additions to long-lived assets | 5,962 | 3,520 | 12,374 | 6,049 |
Transfers from non-operating properties | 0 | 66 | 2 | 106 |
Segment assets | 167,810 | 161,007 | 167,810 | 161,007 |
Reportable segments | Defense/IT Portfolio | Data Center Shells |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 10,715 | 9,029 | 32,224 | 27,086 |
Other segment items: |  |  |  |  |
Property operating expenses | (1,701) | (1,554) | (5,337) | (4,588) |
UJV NOI allocable to COPT Defense | 1,864 | 1,844 | 5,623 | 5,319 |
Total other segment items | 163 | 290 | 286 | 731 |
NOI | 10,878 | 9,319 | 32,510 | 27,817 |
Additions to long-lived assets | 0 | 0 | 0 | 0 |
Transfers from non-operating properties | 1,215 | 406 | 10,481 | 3,891 |
Segment assets | 473,277 | 427,972 | 473,277 | 427,972 |
Reportable segments | Other |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |
Revenues from real estate operations | 18,737 | 17,415 | 55,655 | 50,675 |
Other segment items: |  |  |  |  |
Property operating expenses | (9,776) | (10,026) | (28,605) | (29,323) |
UJV NOI allocable to COPT Defense | 0 | 0 | 0 | 0 |
Total other segment items | (9,776) | (10,026) | (28,605) | (29,323) |
NOI | 8,961 | 7,389 | 27,050 | 21,352 |
Additions to long-lived assets | 2,866 | 4,040 | 8,228 | 14,287 |
Transfers from non-operating properties | 142 | 141 | 5,141 | 1,884 |
Segment assets | $ 315,621 | $ 311,421 | $ 315,621 | $ 311,421 |

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