Segments - Net Income of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information
Rental revenues	$ 27,232	$ 23,283
Rental expenses	6,068	5,329
Real estate taxes	2,509	2,349
Segment revenues	63,519	36,803
Segment expenses	61,196	35,037
Net operating income	8,466	5,999
Operating Segments
Segment Reporting Information
Net operating income	20,978	17,371
Office real estate \| Operating Segments
Segment Reporting Information
Rental revenues	4,906	5,521
Rental expenses	1,325	1,456
Real estate taxes	450	539
Net operating income	3,131	3,526
Retail real estate \| Operating Segments
Segment Reporting Information
Rental revenues	15,631	13,032
Rental expenses	2,520	2,336
Real estate taxes	1,450	1,284
Net operating income	11,661	9,412
Multifamily residential real estate \| Operating Segments
Segment Reporting Information
Rental revenues	6,695	4,730
Rental expenses	2,223	1,537
Real estate taxes	609	526
Net operating income	3,863	2,667
General contracting and real estate services \| Operating Segments
Segment Reporting Information
Segment revenues	63,519	36,803
Segment expenses	61,196	35,037
Net operating income	$ 2,323	$ 1,766

Amount of expense incurred related to general contracting and real estate services.

No definition available.

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- Definition

Amount of expense incurred and directly related to generating revenue from leased and rented property or equipment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(c))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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- Definition

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707

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- Definition

The aggregate revenue from real estate operations during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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- Definition

A tax based on the assessed value of real estate by the local government. The tax is usually based on the value of property (including the land).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6419918&loc=d3e35301-107843

+ Details

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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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