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Real Estate Assets, Net - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) property | Jun. 30, 2020 USD ($) property | Jun. 30, 2021 USD ($) property | Jun. 30, 2020 USD ($) property | Dec. 31, 2020 USD ($) property | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net investments in real estate | $ 4,768 | [1] | $ 8,233 | $ 4,768 | [1] | $ 8,233 | $ 8,526 | [1] | $ 7,098 | $ 12,250 | $ 15,071
Property held-for-sale | 4,400 |  |  | 4,400 |  |  | 7,800 |  |  |  |
Rental properties | $ 400 |  |  | 400 |  |  | 700 |  |  |  |
Real estate held for sale improvements |  |  |  | $ 300 |  |  | $ 300 |  |  |  |
Number of properties owned | property |  |  |  | 25 |  |  | 38 |  |  |  |
Number of held-for-sale properties | property |  |  |  | 20 |  |  | 32 |  |  |  |
Number of rental properties | property |  |  |  | 5 |  |  | 6 |  |  |  |
Number of held-for-sale residential properties disposed | property | 11 |  | 14 | 20 |  | 33 |  |  |  |  |
Gain (loss) on sale of property |  |  |  | $ 197 |  | $ 591 |  |  |  |  |
Real estate impairment | $ 100 |  | $ 100 | 200 |  | 1,000 |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net investments in real estate | 4,800 |  |  | 4,800 |  |  | $ 8,500 |  |  |  |
Property held-for-sale | 4,409 |  |  | 4,409 |  |  | $ 7,807 |  |  |  |
Other income |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property | $ 100 |  | $ 400 | $ 200 |  | $ 800 |  |  |  |  |
[1] | Real estate owned properties, net, includes valuation allowances of $0.5 million and $1.4 million at June 30, 2021 and December 31, 2020, respectively.

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