Real Estate Acquisitions (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended					0 Months Ended	1 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Property	Jun. 30, 2011	Jun. 30, 2012 Year-to-date 2012 aquisitions	Jun. 30, 2012 Year-to-date 2012 aquisitions	Jun. 30, 2012 Centennial, Colorado Acquisition, July 31, 2012	Jun. 30, 2012 Acquired-in-place leases	Jun. 30, 2011 Acquired-in-place leases	Jun. 30, 2011 Acquired below-market leases	Jul. 31, 2012 Subsequent event Centennial, Colorado Acquisition, July 31, 2012 Property	Jul. 31, 2012 Subsequent event Centennial, Colorado Acquisition, July 31, 2012
Business Acquisition [Line Items]
Number of businesses acquired			2								1
Business Acquisition, Purchase Price Allocation [Abstract]
Land	$ 1,552,389	$ 3,956,317	$ 1,552,389	$ 3,956,317
Buildings and improvements	6,001,392	27,072,394	6,001,392	27,072,394
Acquired finite-lived intangible asset - leases, amount								1,042,302	3,433,205
Acquired Finite Lived Intangible Liability, Amount										(1,611,916)
Total purchase price	8,596,083	32,850,000	8,596,083	32,850,000							32,600,000	32,600,000
Acquisition costs	304,501	718,839	304,501	718,839	262,000	262,000	43,000					651,000
Business acquisition, unpaid tenant improvement allowance		1,000,000		1,000,000
Revenue since acquisition date	200,000	0	189,000	9,000
Net loss since acquisition date	(200,000)	(700,000)	196,000	718,839
Pro forma basis
Revenue	1,163,890	241,394	2,327,778	482,786
Net income (loss)	$ (953)	$ (528,857)	$ 53,163	$ (790,569)