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Mortgage Notes Payable (Parenthetical) (Details)

3 Months Ended

Mar. 31, 2018

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]

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%

Bismarck Office Building [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate Terms

Interest rate is subject to reset on September 1, 2023 and on September 1, 2030.

Fixed interest rate on mortgage (in hundredth)

4.02%

^[2],[3]

[1]	Interest rate is subject to reset on July 1, 2018
[2]	Interest rates as of March 31, 2018.
[3]	Interest rate is subject to reset on September 1, 2023 and on September 1, 2030.

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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- 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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Details

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- Details

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