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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) $ in Thousands, £ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 30, 2020 USD ($) | Nov. 30, 2020 GBP (£) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jan. 01, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 6,535,079 | $ 6,375,093 |  |  |  |  |  |
% of Portfolio |  | 100.00% | 100.00% |  |  |  |  |  |
General CECL allowance |  | $ (38,102) |  |  |  |  |  |  |
Carrying value, net |  | 6,496,977 | $ 6,375,093 |  |  |  |  |  |
General CECL allowance related to unfunded commitments |  | 3,365 | 0 |  |  | $ 3,595 | $ 4,119 | $ 6,059 | $ 3,088
Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | 5,468,098 |  |  |  |  |  |  |
General CECL allowance |  | (17,012) |  |  |  |  |  |  | (12,149)
Carrying value, net | [1],[2] | 5,451,084 | 5,326,967 |  |  |  |  |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | 1,066,981 |  |  |  |  |  |  |
General CECL allowance |  | (21,090) |  |  |  |  |  |  | $ (15,630)
Carrying value, net | [2] | 1,045,893 | 1,048,126 |  |  |  |  |  |
New York City |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 2,370,337 | $ 2,167,487 |  |  |  |  |  |
% of Portfolio |  | 36.30% | 34.00% |  |  |  |  |  |
Northeast |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 103,567 | $ 110,771 |  |  |  |  |  |
% of Portfolio |  | 1.60% | 1.70% |  |  |  |  |  |
United Kingdom |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 1,263,264 | $ 1,274,390 |  |  |  |  |  |
% of Portfolio |  | 19.30% | 20.00% |  |  |  |  |  |
West |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 749,985 | $ 728,182 |  |  |  |  |  |
% of Portfolio |  | 11.50% | 11.40% |  |  |  |  |  |
Midwest |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 552,537 | $ 614,337 |  |  |  |  |  |
% of Portfolio |  | 8.50% | 9.60% |  |  |  |  |  |
Southeast |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 581,301 | $ 564,166 |  |  |  |  |  |
% of Portfolio |  | 8.90% | 8.90% |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 914,088 | $ 915,760 |  |  |  |  |  |
% of Portfolio |  | 13.90% | 14.40% |  |  |  |  |  |
Office |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 1,911,145 | $ 1,401,400 |  |  |  |  |  |
% of Portfolio |  | 29.20% | 22.00% |  |  |  |  |  |
Hotel |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 1,576,369 | $ 1,660,162 |  |  |  |  |  |
% of Portfolio |  | 24.10% | 26.00% |  |  |  |  |  |
Residential-For-Sale, Construction |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 738,035 | $ 692,816 |  |  |  |  |  |
% of Portfolio |  | 11.30% | 10.90% |  |  |  |  |  |
Residential-for-sale: inventory |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 244,803 | $ 321,673 |  |  |  |  |  |
% of Portfolio |  | 3.70% | 5.10% |  |  |  |  |  |
Urban Retail |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 655,456 | $ 643,706 |  |  |  |  |  |
% of Portfolio |  | 10.00% | 10.10% |  |  |  |  |  |
Carrying value, net |  |  |  | $ 422,700 | £ 309.2 |  |  |  |
Healthcare |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 369,676 | $ 371,423 |  |  |  |  |  |
% of Portfolio |  | 5.70% | 5.80% |  |  |  |  |  |
Urban Predevelopment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 298,909 | $ 409,864 |  |  |  |  |  |
% of Portfolio |  | 4.60% | 6.40% |  |  |  |  |  |
Industrial |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 228,918 | $ 227,940 |  |  |  |  |  |
% of Portfolio |  | 3.50% | 3.60% |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value |  | $ 511,768 | $ 646,109 |  |  |  |  |  |
% of Portfolio |  | 7.90% | 10.10% |  |  |  |  |  |
[1] | Includes $5,418,999 and $4,852,087 pledged as collateral under secured debt arrangements in 2020 and 2019, respectively
[2] | Net of $213,102 CECL Allowances in 2020, comprised of $175,000 Specific CECL Allowance and $38,102 General CECL Allowance. Net of $56,981 provision for loan loss in 2019.

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