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MORTGAGE LOANS AND NOTES PAYABLE - Summary (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Mortgage loans and Notes payable |  |
Less: Loan procurement costs, net | $ (3,834) | $ (4,059)
Total mortgage loans and notes payable | 95,263 | 96,040
Net book value of self-storage facilities | 3,771,591 | 3,774,485
Mortgages |  |
Mortgage loans and Notes payable |  |
Carrying value | 93,861 | 94,494
Plus: Unamortized fair value adjustment | 1,657 | 1,833
Less: Loan procurement costs, net | (255) | (287)
Total mortgage loans and notes payable | 95,263 | 96,040
Net book value of self-storage facilities | 204,900 | 206,300
YSI 26 |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 7,748 | 7,805
Effective interest rate (as a percent) | 4.56% |
YSI 57 |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 2,720 | 2,740
Effective interest rate (as a percent) | 4.61% |
YSI 55 |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 21,419 | 21,547
Effective interest rate (as a percent) | 4.85% |
YSI 24 |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 23,822 | 24,042
Effective interest rate (as a percent) | 4.64% |
YSI 65 |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 2,300 | 2,313
Effective interest rate (as a percent) | 3.85% |
YSI 66 |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 30,437 | 30,588
Effective interest rate (as a percent) | 3.51% |
YSI 68 |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 5,415 | $ 5,459
Effective interest rate (as a percent) | 3.78% |

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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=109500613&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=119400593&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=6877327&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=6876686&loc=d3e534808-122878 + Details
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