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MORTGAGE NOTES PAYABLE (Details) (Mortgages payable, USD $)	9 Months Ended	1 Months Ended			1 Months Ended		9 Months Ended
	Sep. 30, 2012	Jul. 31, 2011 Battle Green Apartments	Sep. 30, 2012 Battle Green Apartments	Jul. 27, 2011 Battle Green Apartments	Jun. 30, 2011 Battle Green Apartments Harold Brown	Jun. 02, 2011 Battle Green Apartments Harold Brown	Sep. 30, 2012 Boylston Street, Westgate Woburn, School Street and Cypress Street	Sep. 30, 2012 Minimum	Sep. 30, 2012 Weighted average	Sep. 30, 2012 Maximum
MORTGAGE NOTES PAYABLE
Interest rate (as a percent)			4.95%			6.00%		4.25%	5.53%	7.07%
Amount of monthly installments including principal	$ 742,000
Effective interest rate (as a percent)	5.62%		5.07%
Annual maturities of mortgage debt
2013-current maturities	41,357,000
2014	7,889,000
2015	9,116,000
2016	192,000
2017	202,000
Thereafter	79,580,000
Total	138,336,000
Additional disclosures related to mortgages
Borrowings		5,000,000			3,998,573
Amortization period of debt		30 years
Deferred financing cost associated with mortgage				100,000
Total amount expected to be refinanced							47,000,000
Expected prepayment penalties upon refinancing							$ 1,000,000

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