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SEGMENT INFORMATION - Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Operating properties | $ 3,374,780 | $ 3,542,232 | $ 3,617,240
Right of use asset - operating leases, net | 18,412 | 19,031 |
Construction-in-progress | 94,628 | 135,529 |
Land held for development | 81,318 | 82,510 |
Prepaid leasehold interests in land held for development, net | 27,762 | 27,762 |
Total Core Segments | Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | 3,097,025 | 3,237,096 |
Philadelphia CBD | Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | 1,556,696 | 1,534,893 |
Pennsylvania Suburbs | Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | 869,179 | 900,230 |
Austin, Texas | Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | 671,150 | 801,973 |
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | $ 277,755 | $ 305,136 |

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