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Mortgage Notes Payable (Parenthetical) (Details)

12 Months Ended

Dec. 31, 2017

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%

^[1],[2]

Grand Pacific Center [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate Terms

Interest rate is subject to reset on September 1, 2023

Fixed interest rate on mortgage (in hundredth)

4.02%

^[2],[3]

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)

5.50%

[1]	Interest rate is subject to reset on July 1, 2018.
[2]	Interest rates as of December 31, 2017.
[3]	Interest rate is subject to reset on September 1, 2023

X

- 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

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+ 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

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+ References

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