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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 534,852 | $ 580,417 | $ 544,345
Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 393,178 | 411,524 |
Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 104,086 | 114,224 |
Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 497,264 | 525,748 |
Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 4,868 | 8,857 |
Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 11,372 | 20,060 |
Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 513,504 | 554,665 | 515,044
Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 18,580 | 19,626 | 22,557
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 2,768 | 6,126 | $ 6,744
Philadelphia CBD |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 232,028 | 263,769 |
Philadelphia CBD | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 166,286 | 178,481 |
Philadelphia CBD | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 51,410 | 58,580 |
Philadelphia CBD | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 217,696 | 237,061 |
Philadelphia CBD | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1,146 | 3,745 |
Philadelphia CBD | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 10,777 | 18,665 |
Philadelphia CBD | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 229,619 | 259,471 |
Philadelphia CBD | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 927 | 876 |
Philadelphia CBD | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1,482 | 3,422 |
Pennsylvania Suburbs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 141,613 | 141,084 |
Pennsylvania Suburbs | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 128,044 | 125,969 |
Pennsylvania Suburbs | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 12,951 | 14,282 |
Pennsylvania Suburbs | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 140,995 | 140,251 |
Pennsylvania Suburbs | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (12) | (12) |
Pennsylvania Suburbs | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 179 | 174 |
Pennsylvania Suburbs | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 141,162 | 140,413 |
Pennsylvania Suburbs | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 39 | 43 |
Pennsylvania Suburbs | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 412 | 628 |
Austin, Texas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 102,982 | 104,157 |
Austin, Texas | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 63,366 | 62,232 |
Austin, Texas | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 35,123 | 34,748 |
Austin, Texas | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 98,489 | 96,980 |
Austin, Texas | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 3,531 | 4,638 |
Austin, Texas | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 49 | 165 |
Austin, Texas | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 102,069 | 101,783 |
Austin, Texas | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 689 | 1,956 |
Austin, Texas | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 224 | 418 |
Metropolitan DC |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 40,223 | 51,498 |
Metropolitan DC | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 29,830 | 39,420 |
Metropolitan DC | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 3,544 | 4,029 |
Metropolitan DC | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 33,374 | 43,449 |
Metropolitan DC | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 0 |
Metropolitan DC | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 135 | 824 |
Metropolitan DC | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 33,509 | 44,273 |
Metropolitan DC | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 6,541 | 6,922 |
Metropolitan DC | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 173 | 303 |
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 13,469 | 14,558 |
Other | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 8,064 | 7,834 |
Other | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 2,401 | 3,080 |
Other | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 10,465 | 10,914 |
Other | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 203 | 486 |
Other | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 232 | 232 |
Other | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 10,900 | 11,632 |
Other | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 2,560 | 2,915 |
Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 9 | 11 |
Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 4,537 | 5,351 |
Corporate | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (2,412) | (2,412) |
Corporate | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (1,343) | (495) |
Corporate | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (3,755) | (2,907) |
Corporate | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 0 |
Corporate | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 0 |
Corporate | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (3,755) | (2,907) |
Corporate | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 7,824 | 6,914 |
Corporate | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 468 | $ 1,344 |

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