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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 | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 6,432,381 | $ 6,375,093
% of Portfolio | 100.00% | 100.00%
General CECL Allowance | $ (44,544) |
Total carrying value, net | 6,387,837 | $ 6,375,093
New York City |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 2,359,066 | $ 2,167,487
% of Portfolio | 36.70% | 34.00%
Northeast |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 132,308 | $ 110,771
% of Portfolio | 2.10% | 1.70%
United Kingdom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,236,696 | $ 1,274,390
% of Portfolio | 19.20% | 20.00%
West |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 725,507 | $ 728,182
% of Portfolio | 11.30% | 11.40%
Midwest |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 556,873 | $ 614,337
% of Portfolio | 8.60% | 9.60%
Southeast |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 521,586 | $ 564,166
% of Portfolio | 8.10% | 8.90%
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 900,345 | $ 915,760
% of Portfolio | 14.00% | 14.40%
Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,764,267 | $ 1,401,400
% of Portfolio | 27.40% | 22.00%
Hotel |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,551,144 | $ 1,660,162
% of Portfolio | 24.10% | 26.00%
Residential-for-sale: construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 783,359 | $ 692,816
% of Portfolio | 12.20% | 10.90%
Residential-for-sale: inventory |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 282,034 | $ 321,673
% of Portfolio | 4.40% | 5.10%
Urban Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 622,894 | $ 643,706
% of Portfolio | 9.70% | 10.10%
Healthcare |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 355,121 | $ 371,423
% of Portfolio | 5.50% | 5.80%
Urban Predevelopment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 294,401 | $ 409,864
% of Portfolio | 4.60% | 6.40%
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 779,161 | $ 874,049
% of Portfolio | 12.10% | 13.70%

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