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Variable Interest Entities - Narrative (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 01, 2024 USD ($) | Mar. 31, 2025 USD ($) joint_venture entity hospital | Dec. 31, 2021 USD ($) | Mar. 31, 2025 USD ($) joint_venture entity hospital | Dec. 31, 2024 USD ($) joint_venture entity | Feb. 28, 2025 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of DownREIT LLCs | entity |  | 8 |  | 8 | 8 |
Loans receivable, net of reserves of $7,554 and $10,499 |  | $ 698,525 |  | $ 698,525 | $ 717,190 |
Secured Mortgage Loans |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans receivable, outstanding balance | $ 89,000 |  |  |  |  |
Outpatient medical | Other | Secured Mortgage Loans |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans receivable, outstanding balance |  | 41,000 |  |  |  |
Payments for loans receivable |  |  |  | 4,000 |  |
PropTech |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Payments to acquire equity investments |  |  |  | 1,000 | 1,000 |
Equity investment, aggregate cost |  | $ 10,000 |  | $ 10,000 |  |
Equity investment, percentage of total fund commitments |  | 5.00% |  | 5.00% |  |
Equity method investment, amount |  | $ 2,000 |  | $ 2,000 |  |
Needham Land Parcel JV | Lab Buildings |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Investment ownership percentage |  | 38.00% | 38.00% | 38.00% |  |
Cash paid |  |  | $ 13,000 |  |  |
Equity method investment, amount |  | $ 21,157 |  | $ 21,157 | $ 21,348 |
HQ Point Investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Equity investment, aggregate cost |  |  |  |  |  | $ 50,000
HQ Point Investment | Lab Buildings |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Payments to acquire equity investments |  |  |  | $ 21,000 |  |
Unconsolidated Variable Interest Entities | Commercial Mortgage-Backed Securities |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of hospitals | hospital |  | 3 |  | 3 |  |
Ventures V |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
VIE ownership percentage |  |  |  | 51.00% |  |
MSREI JV |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
VIE ownership percentage |  |  |  | 51.00% |  |
DownREIT Partnerships |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of DownREIT LLCs | joint_venture |  | 8 |  | 8 | 8 |

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