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Loans Receivable - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2024 USD ($) loan | Dec. 31, 2023 USD ($) | Oct. 31, 2024 USD ($) | Jul. 31, 2024 USD ($) extension_option property | May 31, 2024 USD ($) | Feb. 29, 2024 USD ($) | Jan. 31, 2024 USD ($) | Oct. 31, 2023 USD ($) | Jun. 30, 2023 | May 31, 2023 USD ($) loan | Apr. 30, 2023 USD ($) loan | Feb. 28, 2023 USD ($) loan | Jan. 31, 2021 USD ($) facility | Sep. 30, 2024 USD ($) property | Jun. 30, 2024 USD ($) property | Mar. 31, 2024 USD ($) property | Mar. 31, 2023 USD ($) property | Sep. 30, 2024 USD ($) loan | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans | loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |
Loans receivables, acquired | $ 124,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and leases receivable, remaining commitments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 56,000,000 |  |  |  | $ 56,000,000 |  |
Financing receivable, after allowance for credit loss |  | $ 218,450,000 |  |  |  |  |  |  |  |  |  |  |  | 677,590,000 |  |  |  | 677,590,000 |  |
Credit loss reserve on unfunded loan commitments |  | 700,000 |  |  |  |  |  |  |  |  |  |  |  | 4,900,000 |  |  |  | 4,900,000 |  |
Sunrise Senior Housing Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and leases receivable, remaining commitments |  | 29,000,000 |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | facility |  |  |  |  |  |  |  |  |  |  |  |  | 32 |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  | $ 664,000,000 |  |  |  |  |  |  |
Investments in loans receivable |  |  |  |  |  |  |  |  |  |  |  |  | 410,000,000 |  |  |  |  |  |  |
Capital expenditure funding, amount committed |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  | $ 92,000,000 |  |  |  |  |  | $ 40,000,000 |
Capital expenditure funding, cost of capital, percent committed |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |
Proceeds from the collection of loans receivable |  |  |  |  | $ 5,000,000 | $ 69,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,000,000 | $ 246,000,000
Capital expenditure funding, amount funded |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, after allowance for credit loss |  | 131,000,000 |  |  |  |  |  |  |  |  |  |  |  | 58,000,000 |  |  |  | $ 58,000,000 |  |
Sunrise Senior Housing Portfolio | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, conversion of basis spread on variable rate |  |  |  |  |  | 0.10% |  |  | 0.10% |  |  |  |  |  |  |  |  |  |  |
Loans receivable, floor rate |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sunrise Senior Housing Portfolio | Secured Overnight Financing Rate (SOFR), First Two Years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, basis spread on variable rate |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan receivable, extended maturity term |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sunrise Senior Housing Portfolio | Secured Overnight Financing Rate (SOFR), Last Eighteen Months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, basis spread on variable rate |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan receivable, extended maturity term |  |  |  |  |  | 18 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | facility |  |  |  |  |  |  |  |  |  |  |  |  | 16 |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  | $ 230,000,000 |  |  |  |  |  |  |
Investments in loans receivable |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |
Loans receivable, extension fee |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |
Outpatient Medical Buildings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  | $ 674,000,000 |  |  |  |  |  |  |  |  |  | 674,000,000 | $ 179,000,000 | $ 29,000,000 | $ 32,000,000 |  |  |
Investments in loans receivable |  |  |  | $ 405,000,000 |  |  |  |  |  |  |  |  |  | $ 405,000,000 |  |  |  |  |  |
Number of properties sold | property |  |  |  | 59 |  |  |  |  |  |  |  |  |  | 59 | 11 | 2 | 2 |  |  |
Loans receivable, number of extensions | extension_option |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan receivable, period of extensions |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from loan originations |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mark-to-market discount of real estate |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (20,000,000) |  |  |  |  |  |
Loans receivable, stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.25% |  |  |  | 6.25% |  |
Noncash or part noncash, interest income |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  | $ 1,000,000 |  |
Other non-reportable | Brookedale MTCA | Lessor Asset Under Operating Lease | CCRC JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, after allowance for credit loss |  | 43,000,000 |  |  |  |  |  |  |  |  |  |  |  | 56,000,000 |  |  |  | 56,000,000 |  |
Minimum | Outpatient Medical Buildings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, interest rate |  |  |  | 0.060 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Outpatient Medical Buildings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, interest rate |  |  |  | 0.065 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Mortgage Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans | loan | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, outstanding balance | $ 89,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable with imputed interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  | 1,000,000 |  |
Secured Mortgage Loans | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the collection of loans receivable |  |  |  |  |  |  |  | $ 21,000,000 |  | $ 12,000,000 | $ 14,000,000 | $ 35,000,000 |  |  |  |  |  |  |  |
Number of secured loans | loan |  |  |  |  |  |  |  |  |  | 2 | 1 | 1 |  |  |  |  |  |  |  |
Secured Mortgage Loans | Other | During June 2024 to December 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, outstanding balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000,000 |  |
Number of secured loans | loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Secured Mortgage Loans | Secured Overnight Financing Rate (SOFR) | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, conversion of basis spread on variable rate |  |  |  |  |  |  |  |  |  | 0.10% |  |  |  |  |  |  |  |  |  |
Secured Mortgage Loans | LIBOR | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, outstanding balance |  |  |  |  |  |  |  |  |  | $ 21,000,000 |  |  |  |  |  |  |  |  |  |
Number of secured loans | loan |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Secured Mortgage Loans | SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the collection of loans receivable |  |  |  |  |  |  |  |  |  |  |  | $ 102,000,000 |  |  |  |  |  |  |  |
Loans receivable, floor rate |  |  |  |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, after allowance for credit loss |  | $ 48,000,000 |  |  |  |  |  |  |  |  |  |  |  | 48,000,000 |  |  |  | $ 48,000,000 |  |
Loans receivable, extension fee |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Mortgage Loans | SHOP | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, conversion of basis spread on variable rate |  |  |  |  |  |  | 0.11% |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  | 0.11% |  |  |  |  |  |  |  |
Loans receivable, floor rate |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Mortgage Loans | SHOP | Secured Overnight Financing Rate (SOFR), First Six Months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |
Secured Mortgage Loans | SHOP | Secured Overnight Financing Rate (SOFR), Last Six Months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |
Secured Mortgage Loans | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, interest rate | 0.0700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Mortgage Loans | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, interest rate | 0.1000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mezzanine loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans | loan | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, outstanding balance | $ 36,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable with imputed interest |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  | $ 3,000,000 |  |
Mezzanine loans | Other | During May 2026 to May 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans | loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Loans receivable, outstanding balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |
Mezzanine loans | Other | During October 2024 to April 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans | loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Loans receivable, outstanding balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |
Mezzanine loans | Other | During June 2024 to June 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans | loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Loans receivable, outstanding balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |
Mezzanine loans | Other | Mezzanine Loan Maturity Due October 2025 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, outstanding balance |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, stated interest rate |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mezzanine loans | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, interest rate | 0.0800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mezzanine loans | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, interest rate | 0.1000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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