Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($) $ in Thousands		Jun. 30, 2025	Feb. 28, 2025	Jan. 23, 2025	Jan. 22, 2025	Dec. 31, 2024	Sep. 25, 2024
Schedule of Equity Method Investments [Line Items]
Due from Related Parties		$ 6,155				$ 2,523
Other	[1]	3,716				4,540
Investments in and advances to unconsolidated affiliates		172,418				209,232
Distributions in excess of income from, and investments in, unconsolidated affiliates		17,223				16,514
Related Party
Schedule of Equity Method Investments [Line Items]
Due from Related Parties		$ 1,419				446
840 N. Michigan Avenue
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			2.50%
Renaissance Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage				48.00%	20.00%
Equity method investments				$ 245,700
Fund IV
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		23.12%
Fund V
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		20.10%					90.00%
Core Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 82,881				110,184
Core Portfolio | Renaissance Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	[2]	68.00%
Equity method investments	[2]	$ 0				28,250
Core Portfolio | Gotham Plaza
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		49.00%
Equity method investments		$ 30,384				30,561
Core Portfolio | Georgetown Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	[3]	50.00%
Equity method investments	[3]	$ 3,831				4,214
Core Portfolio | 1238 Wisconsin Avenue
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	[3],[4]	80.00%
Equity method investments	[3],[4]	$ 18,365				19,048
Core Portfolio | Crossroads
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	[5]	49.00%
Distributions in excess of income from, and investments in, unconsolidated affiliates	[5]	$ 17,223				16,514
Core Portfolio | 840 N. Michigan
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	[6],[7]	94.35%
Equity method investments	[6],[7]	$ 30,301				28,111
Investment Management | Fund IV Other Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	[8],[9]	90.00%
Equity method investments	[8],[9]	$ 3,531				5,291
Investment Management | 650 Bald Hill Road
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	[9]	90.00%
Equity method investments	[9]	$ 9,063				9,220
Investment Management | Fund IV
Schedule of Equity Method Investments [Line Items]
Equity method investments	[9]	$ 12,594				14,511
Investment Management | Fund V Family Center at Riverdale
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	[7],[9]	89.42%
Equity method investments	[7],[9]	$ 755				1,832
Investment Management | Tri City Plaza
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	[9]	90.00%
Equity method investments	[9]	$ 6,252				6,914
Investment Management | Frederick County Acquisitions
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	[9],[10]	90.00%
Equity method investments	[9],[10]	$ 4,919				4,375
Investment Management | Wood Ridge Plaza
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	[9]	90.00%
Equity method investments	[9]	$ 8,475				9,313
Investment Management | La Frontera Village
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	[9]	90.00%
Equity method investments	[9]	$ 11,693				13,389
Investment Management | Shoppes at South Hills
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	[9]	90.00%
Equity method investments	[9]	$ 9,193				10,139
Investment Management | Mohawk Commons
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	[9]	90.00%
Equity method investments	[9]	$ 9,938				12,350
Investment Management | Fund V
Schedule of Equity Method Investments [Line Items]
Equity method investments	[9]	$ 51,225				58,312
Investment Management | Shops at Grand
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		5.00%
Equity method investments		$ 2,378				2,452
Investment Management | Walk at Highwoods Preserve
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		20.00%
Equity method investments		$ 1,997				2,279
Investment Management | LINQ Promenade
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		15.00%
Equity method investments		$ 16,208				16,508
Investment Management | Other
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 20,583				$ 21,239

[1] Includes cost-method investment in Fifth Wall. The Company recorded an impairment charge of $0.4 million for the six months ended June 30, 2025, which is included in Realized and unrealized holding gains (losses) on investments and other in the Company’s Condensed Consolidated Statements of Operations.

[2] On January 23, 2025, the Company acquired an additional 48% economic ownership interest, and increased its existing 20% interest to 68%, in the Renaissance Portfolio primarily located in Washington D.C. Prior to the acquisition, the Company accounted for its 20% interest under the equity method of accounting. Due to the Company gaining a controlling financial interest as a result of this acquisition, the Company concluded that the entity is a variable interest entity (“VIE”) and that it is the primary beneficiary, and it should consolidate its investment within its Core Portfolio effective January 23, 2025. Accordingly, the Company recognized a loss on change in control of $9.6 million (Note 2).

[3] Represents a VIE for which the Company is not the primary beneficiary (Note 15).

[4] Includes the amounts advanced against a $12.8 million construction commitment from the Company to the venture that holds its investment in 1238 Wisconsin. As of June 30, 2025 and December 31, 2024 the related party note receivable had a principal balance of $12.8 million, net of a $0.1 million allowance for each period. The loan is secured by the venture members’ equity interest in the entity that owns the 1238 Wisconsin development property, bears interest at Prime + 1.0% (subject to a 4.5% floor), and matures on December 28, 2027. The Company recognized interest income of $0.1 million for each of the three and six months ended June 30, 2025 and 2024, respectively, related to this note receivable.

[5] Distributions have exceeded the Company’s investment; however, the Company recognizes a liability balance as it may elect to contribute capital to the entity.

[6] In February 2025, the Company acquired an additional 2.5% interest in the 840 North Michigan Avenue venture increasing its ownership interest from 91.85% to 94.35%. The note receivable from the 840 North Michigan Avenue venture partners had a balance of $1.5 million and $2.3 million as of June 30, 2025 and December 31, 2024 respectively and matures in July 2025 (Note 3).

[7] Represents a tenancy-in-common interest.

[8] As of June 30, 2025, the investment balance relates to undistributed proceeds from the disposition of the Eden Square property. These proceeds were distributed to Fund IV in July 2025.

[9] The Company owns 23.12% and 20.10% in Funds IV and V, respectively (Note 1). For the ventures within these funds, the ownership interest percentage represents the Fund’s ownership interest and not the Company’s proportionate share.

[10] On September 25, 2024 the venture which Fund V holds a 90% interest in sold a 300,000 square foot property in Frederick County, Maryland commonly referred to as Frederick Crossing. Fund V maintains its 90% interest in the venture which retains its interest in the remaining property of the Frederick County Acquisitions portfolio, commonly referred to as Frederick County Square.