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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%

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