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SEGMENT INFORMATION - Schedule of Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Operating properties | $ 3,265,410 | $ 3,374,780
Right of use asset - operating leases, net | 17,957 | 18,412
Construction-in-progress | 94,635 | 94,628
Land held for development | 73,395 | 81,318
Prepaid leasehold interests in land held for development, net | 27,762 | 27,762
Continuing Operations |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 3,265,410 | 3,374,780
Total Core Segments | Continuing Operations |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 2,984,443 | 3,097,025
Philadelphia CBD | Continuing Operations |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 1,585,703 | 1,556,696
Pennsylvania Suburbs | Continuing Operations |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 885,079 | 869,179
Austin, Texas | Continuing Operations |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 513,661 | 671,150
Other | Continuing Operations |  |
Segment Reporting Information [Line Items] |  |
Operating properties | $ 280,967 | $ 277,755

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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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