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FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
FINANCIAL LIABILITIES |  |
Unsecured senior notes | $ 299,454 | $ 269,246
Mortgages payable | 593,547 |
Carrying Amount |  |
FINANCIAL ASSETS |  |
Cash and cash equivalents | 20,816 | 392
FINANCIAL LIABILITIES |  |
Revolving lines of credit | 57,000 | 152,871
Term loans | 0 | 145,000
Unsecured senior notes | 300,000 | 125,000
Carrying Amount | Mortgages | Mortgages payable - Fannie Mae |  |
FINANCIAL LIABILITIES |  |
Mortgages payable | 198,850 | 0
Carrying Amount | Mortgages | Mortgages payable - other |  |
FINANCIAL LIABILITIES |  |
Mortgages payable | 293,547 | 298,445
Carrying Amount | Restricted cash |  |
FINANCIAL ASSETS |  |
Cash and cash equivalents | 2,376 | 6,918
Fair Value |  |
FINANCIAL ASSETS |  |
Cash and cash equivalents | 20,816 | 392
FINANCIAL LIABILITIES |  |
Revolving lines of credit | 57,000 | 152,871
Term loans | 0 | 145,000
Unsecured senior notes | 308,560 | 133,181
Fair Value | Mortgages | Mortgages payable - Fannie Mae |  |
FINANCIAL LIABILITIES |  |
Mortgages payable | 198,850 | 0
Fair Value | Mortgages | Mortgages payable - other |  |
FINANCIAL LIABILITIES |  |
Mortgages payable | 297,988 | 308,855
Fair Value | Restricted cash |  |
FINANCIAL ASSETS |  |
Cash and cash equivalents | $ 2,376 | $ 6,918

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