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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) | Sep. 30, 2024 | Feb. 29, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Unamortized discounts and fees | $ (24,274,000) |  | $ (131,000) |
Reserve for loan losses | (9,983,000) |  | (2,830,000) | $ (8,280,000)
Loans receivable, net | 677,590,000 |  | 218,450,000 |
Loans and leases receivable, remaining commitments | 56,000,000 |  |  |
Unamortized discount | 4,000,000 |  |  |
Sunrise Senior Housing Portfolio |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans receivable, net | 58,000,000 |  | 131,000,000 |
Loans and leases receivable, remaining commitments |  | $ 0 | 29,000,000 |
Outpatient Medical Buildings |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Unamortized discount | 19,000,000 |  |  |
Secured loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing receivable, gross | 618,216,000 |  | 178,678,000 |
Reserve for loan losses | (8,879,000) |  | (2,830,000) | $ (8,280,000)
CCRC resident loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing receivable, gross | 56,411,000 |  | 42,733,000 |
Mezzanine loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing receivable, gross | $ 37,220,000 |  | $ 0 |

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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- Definition Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481598/310-20-45-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-4 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 3 -SubTopic 20 -Topic 310 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481569/310-20-50-3 + Details
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- Definition Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482949/835-30-55-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482900/835-30-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-1A + Details
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