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Schedule III (Real Estate and Accumulated Depreciation and Amortization) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 162,006,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		49,761,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		211,455,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		261,216,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		14,848,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		49,833,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		226,261,000
SEC Schedule III, Real Estate, Gross, Total		276,046,000
Real Estate Accumulated Depreciation		40,012,255	[1]	$ 36,311,485	$ 29,961,472
Mortgage Loans on Real Estate, Write-down or Reserve, Amount		1,500,000
SEC Schedule III, Real Estate Investment Property, Net, Total		234,534,000
Office/Industrial Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		102,988,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		34,215,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		145,751,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		179,966,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		13,121,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		34,257,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		158,830,000
SEC Schedule III, Real Estate, Gross, Total		193,087,000
Real Estate Accumulated Depreciation	[1]	32,166,000
Mortgage Loans on Real Estate, Write-down or Reserve, Amount		500,000
SEC Schedule III, Real Estate Investment Property, Net, Total		160,421,000
Office/Industrial Properties [Member] | Garden Gateway Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		6,445,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		3,035,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		12,091,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		15,126,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		1,347,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		3,035,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		13,438,000
SEC Schedule III, Real Estate, Gross, Total		16,473,000
Real Estate Accumulated Depreciation	[1]	5,039,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 11,434,000
Real Estate And Accumulated Depreciation Date Acquired		03/07
Office/Industrial Properties [Member] | Garden Gateway Plaza [Member] | Minimum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Year Built Or Renovated		1982
Office/Industrial Properties [Member] | Garden Gateway Plaza [Member] | Maximum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Year Built Or Renovated		2006
Office/Industrial Properties [Member] | Executive Office Park [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 6,000,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		1,266,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		8,815,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		10,081,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		399,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		1,266,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		9,214,000
SEC Schedule III, Real Estate, Gross, Total		10,480,000
Real Estate Accumulated Depreciation	[1]	2,404,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 8,076,000
Real Estate And Accumulated Depreciation Date Acquired		07/08
Real Estate And Accumulated Depreciation Year Built Or Renovated		2000
Office/Industrial Properties [Member] | Pacific Oaks Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 1,466,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		980,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		3,868,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		4,848,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		170,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		980,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		4,038,000
SEC Schedule III, Real Estate, Gross, Total		5,018,000
Real Estate Accumulated Depreciation	[1]	978,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 4,040,000
Real Estate And Accumulated Depreciation Date Acquired		09/08
Real Estate And Accumulated Depreciation Year Built Or Renovated		2005
Office/Industrial Properties [Member] | Morena Office Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 2,156,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		1,333,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		5,203,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		6,536,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		603,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		1,333,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		5,806,000
SEC Schedule III, Real Estate, Gross, Total		7,139,000
Real Estate Accumulated Depreciation	[1]	1,769,000
Mortgage Loans on Real Estate, Write-down or Reserve, Amount		500,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 4,870,000
Real Estate And Accumulated Depreciation Date Acquired		01/09
Real Estate And Accumulated Depreciation Year Built Or Renovated		1985
Office/Industrial Properties [Member] | Genesis Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 4,151,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		1,400,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		8,600,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		10,000,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		898,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		1,400,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		9,498,000
SEC Schedule III, Real Estate, Gross, Total		10,898,000
Real Estate Accumulated Depreciation	[1]	2,289,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 8,609,000
Real Estate And Accumulated Depreciation Date Acquired		08/10
Real Estate And Accumulated Depreciation Year Built Or Renovated		1989
Office/Industrial Properties [Member] | Dakota Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 6,696,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		832,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		8,743,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		9,575,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		2,330,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		832,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		11,073,000
SEC Schedule III, Real Estate, Gross, Total		11,905,000
Real Estate Accumulated Depreciation	[1]	2,270,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 9,635,000
Real Estate And Accumulated Depreciation Date Acquired		05/11
Real Estate And Accumulated Depreciation Year Built Or Renovated		1982
Office/Industrial Properties [Member] | Port of San Diego Complex [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 9,576,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		9,613,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		4,887,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		14,500,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		447,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		9,655,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		5,292,000
SEC Schedule III, Real Estate, Gross, Total		14,947,000
Real Estate Accumulated Depreciation	[1]	1,059,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 13,888,000
Real Estate And Accumulated Depreciation Date Acquired		12/11
Office/Industrial Properties [Member] | Port of San Diego Complex [Member] | Minimum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Year Built Or Renovated		1971
Office/Industrial Properties [Member] | Port of San Diego Complex [Member] | Maximum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Year Built Or Renovated		2008
Office/Industrial Properties [Member] | The Presidio [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 6,454,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		1,325,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		5,950,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		7,275,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		977,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		1,325,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		6,927,000
SEC Schedule III, Real Estate, Gross, Total		8,252,000
Real Estate Accumulated Depreciation	[1]	1,837,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 6,415,000
Real Estate And Accumulated Depreciation Date Acquired		11/12
Real Estate And Accumulated Depreciation Year Built Or Renovated		1985
Office/Industrial Properties [Member] | Grand Pacific Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 17,728,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		413,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		4,926,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		5,339,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		1,529,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		413,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		6,455,000
SEC Schedule III, Real Estate, Gross, Total		6,868,000
Real Estate Accumulated Depreciation	[1]	1,014,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 5,854,000
Real Estate And Accumulated Depreciation Date Acquired		03/14
Real Estate And Accumulated Depreciation Year Built Or Renovated		1976
Office/Industrial Properties [Member] | Union Terrace [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 10,493,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		1,717,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		7,708,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		9,425,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		1,102,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		1,717,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		8,810,000
SEC Schedule III, Real Estate, Gross, Total		10,527,000
Real Estate Accumulated Depreciation	[1]	2,240,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 8,287,000
Real Estate And Accumulated Depreciation Date Acquired		08/14
Real Estate And Accumulated Depreciation Year Built Or Renovated		1982
Office/Industrial Properties [Member] | Centennial Tech Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 6,000,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		2,025,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		13,475,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		15,500,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		251,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		2,025,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		13,726,000
SEC Schedule III, Real Estate, Gross, Total		15,751,000
Real Estate Accumulated Depreciation	[1]	2,320,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 13,431,000
Real Estate And Accumulated Depreciation Date Acquired		12/14
Real Estate And Accumulated Depreciation Year Built Or Renovated		1999
Office/Industrial Properties [Member] | Arapahoe Service Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 1,909,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		1,420,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		10,430,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		11,850,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		489,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		1,420,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		10,919,000
SEC Schedule III, Real Estate, Gross, Total		12,339,000
Real Estate Accumulated Depreciation	[1]	1,701,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 10,638,000
Real Estate And Accumulated Depreciation Date Acquired		12/14
Real Estate And Accumulated Depreciation Year Built Or Renovated		2000
Office/Industrial Properties [Member] | West Fargo Industrial [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 4,365,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		1,693,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		6,207,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		7,900,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		168,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		1,693,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		6,375,000
SEC Schedule III, Real Estate, Gross, Total		8,068,000
Real Estate Accumulated Depreciation	[1]	613,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 7,455,000
Real Estate And Accumulated Depreciation Date Acquired		08/15
Office/Industrial Properties [Member] | West Fargo Industrial [Member] | Minimum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Year Built Or Renovated		1998
Office/Industrial Properties [Member] | West Fargo Industrial [Member] | Maximum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Year Built Or Renovated		2005
Office/Industrial Properties [Member] | 300 N.P. [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 4,058,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		135,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		3,715,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		3,850,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		149,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		135,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		3,864,000
SEC Schedule III, Real Estate, Gross, Total		3,999,000
Real Estate Accumulated Depreciation	[1]	363,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 3,636,000
Real Estate And Accumulated Depreciation Date Acquired		08/15
Real Estate And Accumulated Depreciation Year Built Or Renovated		1922
Office/Industrial Properties [Member] | Highland Court [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 2,381,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		3,608,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		9,442,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		13,050,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		1,127,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		3,608,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		10,569,000
SEC Schedule III, Real Estate, Gross, Total		14,177,000
Real Estate Accumulated Depreciation	[1]	1,890,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 12,287,000
Real Estate And Accumulated Depreciation Date Acquired		08/15
Real Estate And Accumulated Depreciation Year Built Or Renovated		1984
Office/Industrial Properties [Member] | One Park Centre [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 6,500,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		1,206,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		7,944,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		9,150,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		568,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		1,206,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		8,512,000
SEC Schedule III, Real Estate, Gross, Total		9,718,000
Real Estate Accumulated Depreciation	[1]	1,204,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 8,514,000
Real Estate And Accumulated Depreciation Date Acquired		08/15
Real Estate And Accumulated Depreciation Year Built Or Renovated		1983
Office/Industrial Properties [Member] | Shea Center II [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 6,610,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		2,214,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		23,747,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		25,961,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		567,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		2,214,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		24,314,000
SEC Schedule III, Real Estate, Gross, Total		26,528,000
Real Estate Accumulated Depreciation	[1]	3,176,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 23,352,000
Real Estate And Accumulated Depreciation Date Acquired		12/15
Real Estate And Accumulated Depreciation Year Built Or Renovated		2000
Retail Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 30,563,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		8,592,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		28,125,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		36,717,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		1,727,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		8,622,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		29,852,000
SEC Schedule III, Real Estate, Gross, Total		38,426,000
Real Estate Accumulated Depreciation	[1]	6,559,000
Mortgage Loans on Real Estate, Write-down or Reserve, Amount		1,000,000
SEC Schedule III, Real Estate Investment Property, Net, Total		30,867,000
Retail Properties [Member] | World Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		1,698,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		6,232,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		7,930,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		702,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		1,698,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		6,934,000
SEC Schedule III, Real Estate, Gross, Total		8,535,000
Real Estate Accumulated Depreciation	[1]	2,092,000
Mortgage Loans on Real Estate, Write-down or Reserve, Amount		700,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 5,743,000
Real Estate And Accumulated Depreciation Date Acquired		09/07
Real Estate And Accumulated Depreciation Year Built Or Renovated		1974
Retail Properties [Member] | Waterman Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 3,850,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		2,350,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		4,814,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		7,164,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		66,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		2,380,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		4,880,000
SEC Schedule III, Real Estate, Gross, Total		7,263,000
Real Estate Accumulated Depreciation	[1]	1,339,000
Mortgage Loans on Real Estate, Write-down or Reserve, Amount		300,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 5,624,000
Real Estate And Accumulated Depreciation Date Acquired		08/08
Real Estate And Accumulated Depreciation Year Built Or Renovated		2008
Retail Properties [Member] | Yucca Valley Retail Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 8,440,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		2,386,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		5,175,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		7,561,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		749,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		2,386,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		5,924,000
SEC Schedule III, Real Estate, Gross, Total		8,316,000
Real Estate Accumulated Depreciation	[1]	1,711,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 6,605,000
Real Estate And Accumulated Depreciation Date Acquired		9/11, 5/12
Real Estate And Accumulated Depreciation Year Built Or Renovated		1978
Retail Properties [Member] | Union Town Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 8,364,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		1,750,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		9,462,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		11,212,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		152,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		1,750,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		9,614,000
SEC Schedule III, Real Estate, Gross, Total		11,396,000
Real Estate Accumulated Depreciation	[1]	1,187,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 10,209,000
Real Estate And Accumulated Depreciation Date Acquired		12/14
Real Estate And Accumulated Depreciation Year Built Or Renovated		2003
Retail Properties [Member] | Research [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 9,908,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		408,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		2,442,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		2,850,000
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements		58,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		408,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		2,500,000
SEC Schedule III, Real Estate, Gross, Total		2,916,000
Real Estate Accumulated Depreciation	[1]	230,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 2,686,000
Real Estate And Accumulated Depreciation Date Acquired		8/15/2016
Real Estate And Accumulated Depreciation Year Built Or Renovated		2003
Model Home [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 28,455,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		6,954,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		37,579,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		44,533,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		6,954,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		37,579,000
SEC Schedule III, Real Estate, Gross, Total		44,533,000
Real Estate Accumulated Depreciation	[1]	1,287,000
SEC Schedule III, Real Estate Investment Property, Net, Total		43,246,000
Model Home [Member] | NetREIT Dubose Model Home REIT, Inc. [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		7,369,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		2,002,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		10,508,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		12,510,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		2,002,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		10,508,000
SEC Schedule III, Real Estate, Gross, Total		12,510,000
Real Estate Accumulated Depreciation	[1]	487,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 12,023,000
Real Estate And Accumulated Depreciation Date Acquired		2010-2016
Model Home [Member] | NetREIT Dubose Model Home REIT, Inc. [Member] | Minimum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Year Built Or Renovated		2010
Model Home [Member] | NetREIT Dubose Model Home REIT, Inc. [Member] | Maximum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Year Built Or Renovated		2016
Model Home [Member] | Dubose Model Home Investors 201 L.P. [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 4,331,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		1,097,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		5,838,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		6,935,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		1,097,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		5,838,000
SEC Schedule III, Real Estate, Gross, Total		6,935,000
Real Estate Accumulated Depreciation	[1]	236,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 6,699,000
Real Estate And Accumulated Depreciation Date Acquired		2014-2016
Model Home [Member] | Dubose Model Home Investors 201 L.P. [Member] | Minimum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Year Built Or Renovated		2012
Model Home [Member] | Dubose Model Home Investors 201 L.P. [Member] | Maximum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Year Built Or Renovated		2014
Model Home [Member] | Dubose Model Home Investors 202, L.P. [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 9,162,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		2,103,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		11,455,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		13,558,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		2,103,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		11,455,000
SEC Schedule III, Real Estate, Gross, Total		13,558,000
Real Estate Accumulated Depreciation	[1]	267,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 13,291,000
Real Estate And Accumulated Depreciation Date Acquired		2016
Model Home [Member] | Dubose Model Home Investors 202, L.P. [Member] | Minimum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Year Built Or Renovated		2014
Model Home [Member] | Dubose Model Home Investors 202, L.P. [Member] | Maximum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Year Built Or Renovated		2016
Model Home [Member] | NetREIT Model Homes LLC [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances		$ 7,593,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land		1,752,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements		9,778,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total		11,530,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land		1,752,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		9,778,000
SEC Schedule III, Real Estate, Gross, Total		11,530,000
Real Estate Accumulated Depreciation	[1]	297,000
SEC Schedule III, Real Estate Investment Property, Net, Total		$ 11,233,000
Real Estate And Accumulated Depreciation Date Acquired		2016
Real Estate And Accumulated Depreciation Year Built Or Renovated		2016
[1] Depreciation is computed on a straight-line basis using useful lives up to 39 years.

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