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MORTGAGE LOANS AND NOTES PAYABLE - Summary (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Mortgage loans and Notes payable |  |
Less: Loan procurement costs, net | $ (2,038) | $ (2,150)
Total mortgage loans and notes payable | 107,647 | 114,618
Net book value of self-storage facilities | 3,327,220 | 3,326,816
Mortgages |  |
Mortgage loans and Notes payable |  |
Carrying value | 104,776 | 111,586
Plus: Unamortized fair value adjustment | 3,521 | 3,742
Less: Loan procurement costs, net | (650) | (710)
Total mortgage loans and notes payable | 107,647 | 114,618
Net book value of self-storage facilities | $ 221,400 | 233,100
YSI 67 |  |
Mortgage loans and Notes payable |  |
Carrying value |  | 6,216
Effective interest rate (as a percent) | 2.55% |
YSI 33 |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 9,784 | 9,860
Effective interest rate (as a percent) | 6.42% |
YSI 26 |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 8,374 | 8,423
Effective interest rate (as a percent) | 4.56% |
YSI 57 |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 2,940 | 2,957
Effective interest rate (as a percent) | 4.61% |
YSI 55 |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 22,839 | 22,952
Effective interest rate (as a percent) | 4.85% |
YSI 24 |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 26,273 | 26,464
Effective interest rate (as a percent) | 4.64% |
YSI 65 |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 2,445 | 2,457
Effective interest rate (as a percent) | 3.85% |
YSI 66 |  |
Mortgage loans and Notes payable |  |
Carrying value | $ 32,121 | $ 32,257
Effective interest rate (as a percent) | 3.51% |

X
- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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