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Mortgage Notes Payable (Parenthetical) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Sparky's Thousand Palms Self-Storage [Member]
Debt Instrument [Line Items]
Interest rate, minimum (in hundredths)			5.50%
Interest rate, maximum (in hundredths)			10.50%
Sparky's Rialto Self-Storage [Member]
Debt Instrument [Line Items]
Periodic payment			$ 11,982
Executive Office Park [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms		Interest rate is subject to reset on July 1, 2018.	Interest rate is subject to reset on July 1, 2018.
Morena Office Center [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms		Interest rate subject to resetting on the 3r d and 6 th loan anniversary.	Interest rate subject to resetting on the 3r d and 6 th loan anniversary.
Pacific Oaks Plaza [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms		Interest rate subject to resetting on the 3r d and 6 th loan anniversary.	Interest rate subject to resetting on the 3r d and 6 th loan anniversary.
Shoreline Medical Building [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms		Interest rate subject to resetting on the 3r d and 6 th loan anniversary.	Interest rate subject to resetting on the 3r d and 6 th loan anniversary.
Model Home Properties [Member]
Debt Instrument [Line Items]
Fixed interest rate on mortgage range, minimum (in hundredths)	[1]	4.90%	4.90%
Fixed interest rate on mortgage range, maximum (in hundredths)	[1]	5.80%	5.80%
[1] Each Model Home has a standalone mortgage note at interest rates ranging from 4.9% to 5.8% (at December 31, 2015).

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When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

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