Investments in Unconsolidated Ventures - West End Alexandria (Details) $ in Millions	3 Months Ended
	Dec. 31, 2021 USD ($) a	Dec. 31, 2022 a
Central Plaza | Development Plans
Investments in and Advances to Affiliates, Activity [Line Items]
Area of land	41
Area of real estate property (in sqft)	4,000,000
West End Alexandria | Landmark Land Holdings
Investments in and Advances to Affiliates, Activity [Line Items]
Area of land		52
West End Alexandria | Alexandria
Investments in and Advances to Affiliates, Activity [Line Items]
Area of land		11
Fougler Pratt Development, LLC | Landmark Mall Property
Investments in and Advances to Affiliates, Activity [Line Items]
Area of land		33
Fair value of property contributed | $	$ 56.0
Fair value of property contributed, additional | $	10.0
Seritage | Landmark Mall Property
Investments in and Advances to Affiliates, Activity [Line Items]
Area of land		19
Fair value of property contributed | $	$ 30.0