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Loans Receivable - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) property | Apr. 30, 2021 USD ($) property | Jan. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Nov. 30, 2020 USD ($) property | Mar. 31, 2021 USD ($) property | Mar. 31, 2020 USD ($) property | Dec. 31, 2021 property | Dec. 31, 2020 USD ($) property | Oct. 31, 2019 property
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Property count | property | 15 |  |  |  |  |  |  |  |  |
Financing receivable, after allowance for credit loss |  |  |  | $ 195,375,000 |  | $ 740,142,000 |  |  | $ 195,375,000 |
Loss on sale of financing receivable |  |  |  |  |  |  | $ (42,000,000) |  |  |
Net cash provided by financing activities |  |  |  |  |  | (924,119,000) | 761,421,000 |  |  |
Reduction of gain on sale of real estate |  |  |  |  |  | 0 | (2,069,000) |  |  |
Credit loss reserve on unfunded loan commitments |  |  |  | 1,000,000 |  | 400,000 |  |  | 1,000,000 |
Credit loss expenses |  |  |  |  |  | 3,000,000 | $ 8,000,000 |  |  |
Sunrise Senior Housing Portfolio | SHOP |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Net cash provided by financing activities |  |  | $ 410,000,000 |  |  |  |  |  |  |
Capital expenditure funding, amount committed |  |  | $ 92,000,000 |  |  |  |  |  |  |
Capital expenditure funding, amount funded |  |  |  |  |  | 0 |  |  |  |
Capital expenditure funding, cost of capital, percent committed |  |  | 65.00% |  |  |  |  |  |  |
Secured mortgage loans |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Financing receivable, gross |  |  |  | $ 161,530,000 |  | $ 724,389,000 |  |  | $ 161,530,000 |
SHOP |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  | 16 |  |  | 1 | 7 |  | 23 |
SHOP | Subsequent Event |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  | 2 |  |  |  |  |  |  |  |
SHOP | Discovery SHOP Portfolio | Subsequent Event |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  | 10 |  |  |  |  |  |  |  |
SHOP | Sunrise Senior Housing Portfolio |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  | 32 |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  | $ 664,000,000 |  |  |  |  |  |  |
Net cash provided by financing activities |  |  | 410,000,000 |  |  |  |  |  |  |
SHOP | Sunrise Senior Housing Portfolio | Subsequent Event |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  | 2 |  |
SHOP | Atria SHOP Portfolio |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  | 4 |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  | $ 94,000,000 |  |  |  |  |  |
Net cash provided by financing activities |  |  |  | $ 61,000,000 |  |  |  |  |  |
SHOP | Secured Loans | Discovery SHOP Portfolio | Subsequent Event |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Number of loan receivables | property |  | 2 |  |  |  |  |  |  |  |
Other non-reportable |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  |  |  |  |  |  | 1 |
Proceeds from sale of buildings |  |  |  |  |  |  |  |  | $ 1,000,000 |
Secured Loans |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Number of loan receivables | property |  |  |  |  | 1 |  |  |  |  |
Financing receivable, gross |  |  |  |  | $ 10,000,000 |  |  |  |  |
Proceeds from sale of receivables |  |  |  |  | 8,000,000 |  |  |  |  |
Loss on sale of financing receivable |  |  |  |  | $ 2,000,000 |  |  |  |  |
Secured mortgage loans |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Number of loan receivables | property |  |  |  | 1 |  |  |  |  | 1 |
Financing receivable, gross |  |  |  | $ 115,000,000 |  |  |  |  | $ 115,000,000 |
Proceeds from sale of receivables |  |  |  | 109,000,000 |  |  |  |  |  |
Loss on sale of financing receivable |  |  |  | $ 6,000,000 |  |  |  |  |  |
Brookedale MTCA |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Reduction of gain on sale of real estate | $ (164,000,000) |  |  |  |  |  |  |  |  |
Assets Leased to Others | Other non-reportable |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Property count | property |  |  |  | 1 |  |  |  |  | 1 |
Assets Leased to Others | Brookedale MTCA | Other non-reportable |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Property count | property | 13 |  |  |  |  |  |  |  |  |
CCRC JV | Brookedale MTCA |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Property count | property | 15 |  |  |  |  |  |  |  |  |
CCRC JV | Assets Leased to Others | Other non-reportable |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Property count | property |  |  |  |  |  |  |  |  |  | 15
CCRC JV | Assets Leased to Others | Brookedale MTCA | Other non-reportable |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Property count | property | 13 |  |  |  |  |  |  |  |  |
Financing receivable, after allowance for credit loss | $ 30,000,000 |  |  | $ 23,000,000 |  | $ 24,000,000 |  |  | $ 23,000,000 |
SHOP |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  | 230,000,000 |  |  | 5,000,000 | $ 36,000,000 |  | $ 190,000,000 |
Net cash provided by financing activities |  |  | 150,000,000 |  |  |  |  |  |  |
Reduction of gain on sale of real estate |  |  | $ (59,000,000) |  |  | $ 16,000,000 |  |  |  |
Loans receivable, market rate |  |  |  |  |  | 5.25% |  |  |  |
Non-cash interest income |  |  |  |  |  | $ 2,000,000 | $ 0 |  |  |
SHOP | Subsequent Event |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  | $ 13,000,000 |  |  |  |  |  |  |  |
SHOP | Minimum |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Loans receivable, stated interest rate |  |  |  |  |  | 3.50% |  |  |  |
Interest income, amortization period |  |  |  |  |  | 1 year |  |  |  |
SHOP | Maximum |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Loans receivable, stated interest rate |  |  |  |  |  | 4.50% |  |  |  |
Interest income, amortization period |  |  |  |  |  | 3 years |  |  |  |
SHOP | Discovery SHOP Portfolio | Subsequent Event |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  | $ 334,000,000 |  |  |  |  |  |  |  |
SHOP | Atria SHOP Portfolio |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |
Number of assets to be sold | property |  |  |  | 12 |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  | $ 312,000,000 |  |  |  |  |  |
Reduction of gain on sale of real estate |  |  |  | $ (39,000,000) |  |  |  |  |  |

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