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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2020 | Mar. 31, 2020 | Jan. 01, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 6,476,313 | $ 6,375,093 |  |  |
% of Portfolio | 100.00% | 100.00% |  |  |
General CECL allowance | $ (39,276) |  |  |  |
Carrying value, net | 6,437,037 | $ 6,375,093 |  |  |
General CECL allowance related to unfunded commitments | 3,595 | 0 | $ 4,119 | $ 6,059 | $ 3,088
New York City |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 2,393,012 | $ 2,167,487 |  |  |
% of Portfolio | 37.00% | 34.00% |  |  |
Northeast |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 138,448 | $ 110,771 |  |  |
% of Portfolio | 2.10% | 1.70% |  |  |
United Kingdom |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 1,179,761 | $ 1,274,390 |  |  |
% of Portfolio | 18.20% | 20.00% |  |  |
West |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 741,971 | $ 728,182 |  |  |
% of Portfolio | 11.50% | 11.40% |  |  |
Midwest |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 556,011 | $ 614,337 |  |  |
% of Portfolio | 8.60% | 9.60% |  |  |
Southeast |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 576,420 | $ 564,166 |  |  |
% of Portfolio | 8.90% | 8.90% |  |  |
Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 890,690 | $ 915,760 |  |  |
% of Portfolio | 13.70% | 14.40% |  |  |
Office |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 1,832,607 | $ 1,401,400 |  |  |
% of Portfolio | 28.30% | 22.00% |  |  |
Hotel |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 1,578,614 | $ 1,660,162 |  |  |
% of Portfolio | 24.40% | 26.00% |  |  |
Residential-for-sale: construction |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 894,610 | $ 692,816 |  |  |
% of Portfolio | 13.80% | 10.90% |  |  |
Residential-for-sale: inventory |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 150,015 | $ 321,673 |  |  |
% of Portfolio | 2.30% | 5.10% |  |  |
Urban Retail |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 636,308 | $ 643,706 |  |  |
% of Portfolio | 9.80% | 10.10% |  |  |
Urban Predevelopment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 295,728 | $ 409,864 |  |  |
% of Portfolio | 4.60% | 6.40% |  |  |
Healthcare |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 363,170 | $ 371,423 |  |  |
% of Portfolio | 5.60% | 5.80% |  |  |
Industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 228,674 | $ 227,940 |  |  |
% of Portfolio | 3.50% | 3.60% |  |  |
Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Carrying Value | $ 496,587 | $ 646,109 |  |  |
% of Portfolio | 7.70% | 10.10% |  |  |

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