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Loans Receivable - SHOP Seller Financing (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) property | Jan. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) property
Loans receivable |  |  |  |  |  |  |
Interest income |  |  |  |  | $ 37,773,000 | $ 16,553,000 | $ 9,844,000
Net cash provided by financing activities |  |  |  |  | (1,288,517,000) | 246,450,000 | 647,271,000
Gain (loss) on sales of real estate, net |  |  |  |  | 190,590,000 | 90,350,000 | (40,000)
Loans receivable |  |  | $ 195,375,000 |  | 415,811,000 | 195,375,000 |
Senior Housing Operating Portfolio |  |  |  |  |  |  |
Loans receivable |  |  |  |  |  |  |
Proceeds from sale of buildings |  | $ 230,000,000 |  |  |  |  | 181,000,000
Net cash provided by financing activities |  | 150,000,000 |  |  |  |  |
Gain (loss) on sales of real estate, net |  | 59,000,000 |  | $ 16,000,000 |  |  |
Loans receivable, market rate |  |  |  | 5.25% |  |  |
Non-cash interest income |  |  |  |  | 13,000,000 |  | $ 0
Noncash interest income, acceleration recognition |  |  |  |  | 7,000,000 |  |
Senior Housing Operating Portfolio | Minimum |  |  |  |  |  |  |
Loans receivable |  |  |  |  |  |  |
Loans receivable, stated interest rate |  |  |  | 3.50% |  |  |
Interest income, amortization period (in years) |  |  |  | 1 year |  |  |
Senior Housing Operating Portfolio | Maximum |  |  |  |  |  |  |
Loans receivable |  |  |  |  |  |  |
Loans receivable, stated interest rate |  |  |  | 4.50% |  |  |
Interest income, amortization period (in years) |  |  |  | 3 years |  |  |
Senior Housing Operating Portfolio | Atria SHOP Portfolio |  |  |  |  |  |  |
Loans receivable |  |  |  |  |  |  |
Number of assets sold | property |  |  | 12 |  |  |  |
Proceeds from sale of buildings |  |  | $ 312,000,000 |  |  |  |
Gain (loss) on sales of real estate, net |  |  | $ 39,000,000 |  |  |  |
Senior Housing Operating Portfolio |  |  |  |  |  |  |
Loans receivable |  |  |  |  |  |  |
Net cash provided by financing activities |  | 410,000,000 |  |  |  |  |
Senior Housing Operating Portfolio | Sunrise Senior Housing Portfolio |  |  |  |  |  |  |
Loans receivable |  |  |  |  |  |  |
Capital expenditure funding, amount committed | $ 56,000,000 | $ 92,000,000 |  |  |  |  |
Capital expenditure funding, cost of capital, percent committed |  | 65.00% |  |  |  |  |
Capital expenditure funding, amount funded |  |  |  |  | 400,000 |  |
Senior Housing Operating Portfolio |  |  |  |  |  |  |
Loans receivable |  |  |  |  |  |  |
Number of assets sold | property |  | 16 |  |  |  |  | 18
Senior Housing Operating Portfolio | Sunrise Senior Housing Portfolio |  |  |  |  |  |  |
Loans receivable |  |  |  |  |  |  |
Number of assets sold | property | 2 | 32 |  |  |  |  |
Proceeds from sale of buildings |  | $ 664,000,000 |  |  |  |  |
Proceeds from the collection of loans receivable | $ 246,000,000 |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  | 7,000,000 |  |
Loans receivable |  |  |  |  | 165,000,000 |  |
Senior Housing Operating Portfolio | Atria SHOP Portfolio |  |  |  |  |  |  |
Loans receivable |  |  |  |  |  |  |
Number of assets sold | property |  |  | 4 |  |  |  |
Proceeds from sale of buildings |  |  | $ 94,000,000 |  |  |  |
Net cash provided by financing activities |  |  | $ 61,000,000 |  |  |  |
Mortgage Receivable |  |  |  |  |  |  |
Loans receivable |  |  |  |  |  |  |
Interest income |  |  |  |  | $ 36,000,000 | $ 13,000,000 | $ 6,000,000

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