Real Estate - Schedule of Acquisitions and Conversions (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Total consideration			$ 305,903
Core Portfolio
Business Acquisition [Line Items]
Total consideration			$ 246,696
Core Portfolio | One Twenty One Spring Street | New York, NY
Business Acquisition [Line Items]
Percent Acquired			100.00%
Total consideration			$ 39,637
Core Portfolio | Williamsburg Portfolio | Brooklyn, NY
Business Acquisition [Line Items]
Total consideration	[1]		$ 97,750
Core Portfolio | Beverly Boulevard | West Hollywood
Business Acquisition [Line Items]
Percent Acquired			100.00%
Total consideration			$ 24,117
Core Portfolio | Dallas TX | Henderson Avenue Portfolio
Business Acquisition [Line Items]
Percent Acquired	[2]		100.00%
Total consideration	[2]		$ 85,192
Fund III
Business Acquisition [Line Items]
Total consideration			$ 59,207
Fund III | 640 Broadway | New York, NY
Business Acquisition [Line Items]
Percent Acquired	[3]		100.00%
Total consideration	[3]		$ 59,207
Fund V
Business Acquisition [Line Items]
Total consideration		$ 127,190
Fund V | Cypress Creek | Tampa, FL
Business Acquisition [Line Items]
Percent Acquired		100.00%
Total consideration		$ 49,374
Fund V | Maple Tree Place | Williston, VT
Business Acquisition [Line Items]
Percent Acquired		100.00%
Total consideration		$ 77,816

[1] The Company invested $2.8 million in its 49.99% equity interest and, through a separate lending subsidiary, provided a $64.1 million first mortgage loan and a $30.9 million mezzanine loan to subsidiaries of the venture (such equity and loans have been eliminated in consolidation). Pursuant to the entity’s operating agreement, the venture partner has a one-time right to put its 50.01% interest in the entity (the "Williamsburg NCI", which is further described in Note 10) to the Company for fair value at a future date. Given the preferred rate of return embedded in its equity interests and the accruing debt senior to the equity, the Company did not attribute any initial redemption value to the Williamsburg NCI and recognized a bargain purchase gain of $1.2 million, which is included in Realized and unrealized holding (losses) gains on investments and other on the Consolidated Statements of Operations.

[2] The Henderson Avenue Portfolio comprises 14 operating retail assets, one residential building and two development and redevelopment sites. One of the development sites was sold in October 2022.

[3] The entity was previously accounted for as an equity method investment until an affiliate of Fund III acquired the venture partner's interest in a foreclosure action. Fund III now indirectly owns 100% of the entity and consolidates it.