Real Estate - Assets and Liabilities Held-for-sale (Details) - Held-for-sale - USD ($) $ in Thousands	Jun. 30, 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, 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
One Eleven Congress and 303 Tremont
Assets Held-for-sale, Not Part of Disposal Group [Abstract]
Disposal Group, Including Discontinued Operation, Real Estate	$ 192,230
Disposal Group, Including Discontinued Operation, Land	18,854
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	612
Disposal Group, Including Discontinued Operation, Deferred Rent Receivables	6,355
Disposal Group, Including Discontinued Operation, Intangible Assets	280
Intangible assets, accumulated amortization	3,576
Disposal Group, Including Discontinued Operation, Other Assets	5,255
Disposal Group, Including Discontinued Operation, Assets, Total	223,586
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities	4,149
Disposal Group, Including Discontinued Operation, Deferred Revenue	1,295
Intangible liabilities, accumulated amortization	1,291
Disposal Group, Including Discontinued Operations, Intangible Liabilities	163
Disposal Group, Including Discontinued Operation, Other Liabilities	2,129
Disposal Group, Including Discontinued Operation, Liabilities, Total	$ 7,736

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