Loans Receivable - Schedule of Loans Receivable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Mar. 01, 2024	Feb. 29, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Unamortized discounts and fees	$ (22,380,000)	$ (131,000)
Reserve for loan losses	(10,499,000)	(2,830,000)	$ (8,280,000)
Loans receivable, net	717,190,000	218,450,000
Remaining loans receivable commitments	85,000,000			$ 49,000,000
Unamortized discount	3,000,000
Interest income and other	44,778,000	21,781,000	23,300,000
Sunrise Senior Housing Portfolio
Financing Receivable, Allowance for Credit Loss [Line Items]
Remaining loans receivable commitments		29,000,000			$ 0
Outpatient Medical Buildings
Financing Receivable, Allowance for Credit Loss [Line Items]
Unamortized discount	18,000,000
Mortgage Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, gross	612,784,000
Interest income and other	40,000,000	22,000,000	22,000,000
Secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, gross	638,482,000	178,678,000
Reserve for loan losses	(5,574,000)	(2,830,000)	$ (8,280,000)
CCRC resident loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, gross	61,273,000	42,733,000
Mezzanine loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, gross	$ 50,314,000	$ 0