Real Estate - Assets and Liabilities Held-for-sale (Details) - Held-for-sale - USD ($) $ in Thousands	1 Months Ended
Mar. 31, 2026	Dec. 31, 2025
Harborview Plaza and 303 Tremont
Assets Held-for-sale, Not Part of Disposal Group [Abstract]
Disposal Group, Including Discontinued Operation, Real Estate		$ 35,682
Disposal Group, Including Discontinued Operation, Real Estate Accumulated Depreciation		15,341
Disposal Group, Including Discontinued Operation, Land		18,854
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net		272
Disposal Group, Including Discontinued Operation, Deferred Rent Receivables		2,082
Disposal Group, Including Discontinued Operation, Intangible Assets		138
Intangible assets, accumulated amortization		682
Disposal Group, Including Discontinued Operation, Other Assets		4,461
Disposal Group, Including Discontinued Operation, Assets, Total		61,489
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities		1,769
Disposal Group, Including Discontinued Operation, Deferred Revenue		266
Intangible liabilities, accumulated amortization		140
Disposal Group, Including Discontinued Operations, Intangible Liabilities		49
Disposal Group, Including Discontinued Operation, Other Liabilities		765
Disposal Group, Including Discontinued Operation, Liabilities, Total		$ 2,849
303 Tremont
Assets Held-for-sale, Not Part of Disposal Group [Abstract]
Disposal Group, Including Discontinued Operation, Real Estate	$ 0
Disposal Group, Including Discontinued Operation, Land	18,854
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	0
Disposal Group, Including Discontinued Operation, Deferred Rent Receivables	0
Disposal Group, Including Discontinued Operation, Intangible Assets	0
Disposal Group, Including Discontinued Operation, Other Assets	4,383
Disposal Group, Including Discontinued Operation, Assets, Total	23,237
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities	39
Disposal Group, Including Discontinued Operation, Deferred Revenue	0
Disposal Group, Including Discontinued Operations, Intangible Liabilities	0
Disposal Group, Including Discontinued Operation, Other Liabilities	0
Disposal Group, Including Discontinued Operation, Liabilities, Total	39
One Eleven Congress
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]
Asset Impairment Charges	$ 36,600

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