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SEGMENT INFORMATION - Schedule of Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 131,782 | $ 129,372 | $ 383,612 | $ 384,481
Operating expenses | (46,279) | (46,399) | (140,007) | (143,253)
Net operating income | 85,503 | 82,973 | 243,605 | 241,228
Operating Segments | Philadelphia CBD |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 56,448 | 56,367 | 169,159 | 169,265
Operating expenses | (19,959) | (18,609) | (58,912) | (59,452)
Net operating income | 36,489 | 37,758 | 110,247 | 109,813
Operating Segments | Pennsylvania Suburbs |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 31,681 | 32,611 | 95,366 | 97,484
Operating expenses | (10,081) | (9,770) | (29,337) | (29,633)
Net operating income | 21,600 | 22,841 | 66,029 | 67,851
Operating Segments | Austin, Texas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 21,951 | 24,457 | 67,360 | 73,475
Operating expenses | (8,429) | (10,044) | (26,276) | (30,021)
Net operating income | 13,522 | 14,413 | 41,084 | 43,454
Operating Segments | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 10,430 | 10,295 | 31,706 | 28,572
Operating expenses | (5,076) | (5,526) | (15,670) | (15,788)
Net operating income | 5,354 | 4,769 | 16,036 | 12,784
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 11,272 | 5,642 | 20,021 | 15,685
Operating expenses | (2,734) | (2,450) | (9,812) | (8,359)
Net operating income | $ 8,538 | $ 3,192 | $ 10,209 | $ 7,326

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