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Mortgage Notes Payable (Parenthetical) (Details) | 6 Months Ended
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Jun. 30, 2016
Morena Office Center [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate Terms | Interest rate subject to resetting on the 6th loan anniversary. |
Fixed interest rate on mortgage (in hundredth) | 4.50% | [1],[2]
Shoreline Medical Building [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate Terms | Interest rate subject to resetting on the 6th loan anniversary. |
Fixed interest rate on mortgage (in hundredth) | 5.10% | [1],[2]
Executive Office Park [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate Terms | Interest rate is subject to reset on July 1, 2018 |
Fixed interest rate on mortgage (in hundredth) | 5.80% | [2],[3]
Pacific Oaks Plaza [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate Terms | Interest rate is subject to reset on April 28, 2017 |
Fixed interest rate on mortgage (in hundredth) | 4.50% | [2],[4]
Model Home Properties [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Fixed interest rate on mortgage (in hundredth) | 3.80% |
Model Home Properties [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Fixed interest rate on mortgage (in hundredth) | 5.80% |
[1] | Interest rate subject to resetting on the 6th loan anniversary.
[2] | Interest rates as of June 30, 2016.
[3] | Interest rate is subject to reset on July 1, 2018
[4] | Interest rate is subject to reset on April 28, 2017.

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- Definition 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 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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