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Acquisitions and Dispositions - Narrative (Details) $ in Thousands	1 Months Ended		2 Months Ended	3 Months Ended	12 Months Ended
	Jun. 30, 2025 USD ($)	Mar. 31, 2024 USD ($) multifamily_asset	Oct. 31, 2024 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2025 USD ($)
Business Combination [Line Items]
Contract asset					$ 170,419	$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | First Stamford Place, Stamford, Connecticut
Business Combination [Line Items]
Recognized gain reflected in statement of operation				$ 13,200	$ 13,300
Contract asset						$ 170,400
Williamsburg Retail
Business Combination [Line Items]
Consideration paid	$ 31,000		$ 195,000
Victory (561 10th Avenue) and 345 East 94th Street
Business Combination [Line Items]
Consideration paid		$ 14,200
Proportion of interest acquired (as a percent)		10.00%
Number of businesses acquired | multifamily_asset		2
Business combination, in-place debt		$ 18,000

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