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Concentration of Credit Risk (Details)	6 Months Ended
	Jun. 30, 2012 Person
Concentration of Credit Risk (Additional Textual) [Abstract]
Number of tenants	10
Percentage accounted by tenants of rental revenues	56.10%
Northern New Jersey/New York City [Member]
Concentration of Credit Risk (Textual) [Abstract]
Number of properties located in Northern New Jersey/New York City	6
Percentage accounted by properties of its annualized base rent	38.70%

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