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Mortgage Notes Payable (Parenthetical) (Details) - USD ($) | 12 Months Ended
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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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- Definition 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 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Minimum contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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