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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 514,651 | $ 506,100 | $ 486,819
Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 19,607 | 23,346 | 18,835
Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 479,849 | 470,851 | 451,519
Rents | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (1,441) | (1,930) | (2,497)
Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 469,047 | 453,198 | 433,766
Total lease revenue | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (1,441) | (1,930) | (2,497)
Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 372,069 | 353,387 | 343,924
Fixed rent | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (1,895) | (1,895) | (2,240)
Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 96,978 | 99,811 | 89,842
Variable rent | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 454 | (35) | (257)
Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1,291 | 2,582 | 5,377
Amortization of deferred market rents | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 0 | 0
Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 9,511 | 15,071 | 12,376
Daily parking & hotel flexible stay | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 0 | 0
Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 24,417 | 24,132 | 26,444
Third party management fees, labor reimbursement and leasing | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 18,486 | 17,613 | 15,440
Other income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 10,385 | 11,117 | 8,856
Other income | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 2,562 | 7,663 | 5,892
Philadelphia CBD |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 220,875 |
Philadelphia CBD | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 230,933 | 220,876 | 207,858
Philadelphia CBD | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 218,078 |
Philadelphia CBD | Rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 223,537 |  | 204,848
Philadelphia CBD | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 202,380 |
Philadelphia CBD | Total lease revenue | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 214,410 |  | 191,026
Philadelphia CBD | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 151,034 |
Philadelphia CBD | Fixed rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 159,732 |  | 149,441
Philadelphia CBD | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 51,346 |
Philadelphia CBD | Variable rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 54,678 |  | 41,585
Philadelphia CBD | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 1,308 |
Philadelphia CBD | Amortization of deferred market rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 649 |  | 2,064
Philadelphia CBD | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 14,390 |
Philadelphia CBD | Daily parking & hotel flexible stay | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 8,478 |  | 11,758
Philadelphia CBD | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 287 |
Philadelphia CBD | Third party management fees, labor reimbursement and leasing | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 405 |  | 893
Philadelphia CBD | Other income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 2,510 |
Philadelphia CBD | Other income | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 6,991 |  | 2,117
Pennsylvania Suburbs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 128,940 |
Pennsylvania Suburbs | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 129,300 | 128,940 | 124,566
Pennsylvania Suburbs | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 128,551 |
Pennsylvania Suburbs | Rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 128,923 |  | 124,256
Pennsylvania Suburbs | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 128,541 |
Pennsylvania Suburbs | Total lease revenue | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 128,923 |  | 124,106
Pennsylvania Suburbs | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 116,926 |
Pennsylvania Suburbs | Fixed rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 118,856 |  | 113,748
Pennsylvania Suburbs | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 11,615 |
Pennsylvania Suburbs | Variable rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 10,067 |  | 10,358
Pennsylvania Suburbs | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 10 |
Pennsylvania Suburbs | Amortization of deferred market rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 |  | (9)
Pennsylvania Suburbs | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 0 |
Pennsylvania Suburbs | Daily parking & hotel flexible stay | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 |  | 159
Pennsylvania Suburbs | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 35 |
Pennsylvania Suburbs | Third party management fees, labor reimbursement and leasing | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 38 |  | 34
Pennsylvania Suburbs | Other income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 354 |
Pennsylvania Suburbs | Other income | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 339 |  | 276
Austin, Texas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 96,329 |
Austin, Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 95,505 | 96,328 | 101,680
Austin, Texas | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 95,414 |
Austin, Texas | Rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 94,657 |  | 100,826
Austin, Texas | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 93,789 |
Austin, Texas | Total lease revenue | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 93,307 |  | 97,395
Austin, Texas | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 60,831 |
Austin, Texas | Fixed rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 63,209 |  | 62,545
Austin, Texas | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 32,958 |
Austin, Texas | Variable rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 30,098 |  | 34,850
Austin, Texas | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 1,264 |
Austin, Texas | Amortization of deferred market rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 642 |  | 3,322
Austin, Texas | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 361 |
Austin, Texas | Daily parking & hotel flexible stay | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 708 |  | 109
Austin, Texas | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 486 |
Austin, Texas | Third party management fees, labor reimbursement and leasing | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 516 |  | 452
Austin, Texas | Other income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 429 |
Austin, Texas | Other income | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 332 |  | 402
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 36,610 |
Other | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 39,306 |  | 33,880
Other | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 30,738 |
Other | Rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 34,173 |  | 24,086
Other | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 30,418 |
Other | Total lease revenue | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 33,848 |  | 23,736
Other | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 26,491 |
Other | Fixed rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 32,167 |  | 20,430
Other | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 3,927 |
Other | Variable rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1,681 |  | 3,306
Other | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 0 |
Other | Amortization of deferred market rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 |  | 0
Other | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 320 |
Other | Daily parking & hotel flexible stay | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 325 |  | 350
Other | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | 5,711 |
Other | Third party management fees, labor reimbursement and leasing | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 4,972 |  | 9,625
Other | Other income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | $ 161 |
Other | Other income | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 161 |  | $ 169

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