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SEGMENT INFORMATION - Schedule of Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Segment Reporting [Line Items] |  |
Operating properties | $ 3,527,129 | $ 3,753,780
Assets held for sale, net | 232,921 | 0
Total | 3,760,050 | 3,753,780
Prepaid ground leases, net | 34,156 | 51,399
Right of use asset - operating leases, net | 12,266 | 17,806
Construction-in-progress | 85,569 | 118,543
Land held for development | 75,134 | 70,405
Prepaid leasehold interests in land held for development, net | 27,762 | 27,762
Continuing Operations |  |
Segment Reporting [Line Items] |  |
Operating properties | 3,527,129 | 3,753,780
Total Core Segments | Continuing Operations |  |
Segment Reporting [Line Items] |  |
Operating properties | 3,387,196 | 3,473,468
Philadelphia CBD | Continuing Operations |  |
Segment Reporting [Line Items] |  |
Operating properties | 2,115,745 | 2,080,220
Pennsylvania Suburbs | Continuing Operations |  |
Segment Reporting [Line Items] |  |
Operating properties | 880,047 | 883,218
Austin, Texas | Continuing Operations |  |
Segment Reporting [Line Items] |  |
Operating properties | 391,404 | 510,030
Other | Continuing Operations |  |
Segment Reporting [Line Items] |  |
Operating properties | $ 139,933 | $ 280,312

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