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MORTGAGE LOANS AND NOTES PAYABLE - Summary (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Mortgage loans and Notes payable |  |
Less: Loan procurement costs, net | $ (2,836) | $ (3,275)
Total mortgage loans and notes payable | 170,025 | 216,504
Net book value of self-storage facilities | 4,510,039 | 4,505,814
Mortgages |  |
Mortgage loans and Notes payable |  |
Carrying value | 157,551 | 202,768
Plus: Unamortized fair value adjustment | 14,375 | 15,879
Less: Loan procurement costs, net | (1,901) | (2,143)
Total mortgage loans and notes payable | 170,025 | 216,504
Net book value of self-storage facilities | $ 455,000 | 539,200
Bronx IX, NY | Mortgages |  |
Mortgage loans and Notes payable |  |
Carrying value |  | 21,030
Effective interest rate (as a percent) | 4.85% |
Bronx X, NY | Mortgages |  |
Mortgage loans and Notes payable |  |
Carrying value |  | 23,148
Effective interest rate (as a percent) | 4.64% |
Nashville V, TN | Mortgages |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 2,234 | 2,261
Effective interest rate (as a percent) | 3.85% |
New York, NY | Mortgages |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 29,663 | 29,981
Effective interest rate (as a percent) | 3.51% |
Annapolis I, MD | Mortgages |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 5,192 | 5,283
Effective interest rate (as a percent) | 3.78% |
Brooklyn XV, NY | Mortgages |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 15,581 | 15,713
Effective interest rate (as a percent) | 2.15% |
Long Island City IV, NY | Mortgages |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 12,728 | 12,852
Effective interest rate (as a percent) | 2.15% |
Long Island City II, NY | Mortgages |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 18,932 | 19,094
Effective interest rate (as a percent) | 2.25% |
Long Island City III, NY | Mortgages |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 18,921 | 19,106
Effective interest rate (as a percent) | 2.25% |
Flushing II, NY | Mortgages |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 54,300 | $ 54,300
Effective interest rate (as a percent) | 2.15% |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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