MORTGAGE NOTES PAYABLE (Details) (USD $)		0 Months Ended	12 Months Ended	0 Months Ended
	Dec. 31, 2013	Jul. 15, 2013 Hamilton Green	Dec. 31, 2013 Mortgages payable	Dec. 20, 2013 Mortgages payable Hamilton Green	Oct. 02, 2013 Mortgages payable Westgate Apartments LLC	Feb. 25, 2013 Mortgages payable Hamilton Cypress LLC Commercial-1031Exchange Brookline, Massachusetts	Mar. 11, 2013 Mortgages payable Property located at School Street	Jul. 07, 2013 Mortgages payable Boylston Downtown L.P. Residential Apartments Boston, Massachusetts	Dec. 31, 2013 Mortgages payable Minimum	Dec. 31, 2013 Mortgages payable Maximum
MORTGAGE NOTES PAYABLE
Interest rate (as a percent)				4.67%	4.65%		3.70%	3.97%	3.25%	5.97%
Amount of monthly installments including principal			$ 835,000	$ 198,982
Weighted average interest rate (as a percent)			4.83%
Effective interest rate (as a percent)	5.52%		4.93%
Annual maturities of mortgage debt
2014-current maturities	8,646,000
2015	2,135,000
2016	1,184,000
2017	1,782,000
2018	7,860,000
Thereafter	176,913,000
Total	198,520,000
Additional disclosures related to mortgages
Amount of mortgage paid off				40,000,000		3,967,000
Mortgage prepayment penalties						0
Amount of new loan					15,700,000		15,000,000	40,000,000
Period of interest only payments on loans				2 years			3 years
Term of debt				15 years	10 years			15 years
Period for which the entity is required to make interest only payments				2 years				3 years
Amortization period of debt				30 years			30 years	30 years
Amount of loan proceeds utilized for pay off the existing mortgage				1,846,000	7,616,000		15,284,000	19,500,000
Deferred financing cost associated with mortgage							159,000
Net proceed from the loan - cash back								20,000,000
Refinancing cost								279,000
Closing costs associated with financing		38,000		346,000	190,000
Amount of new loan				$ 38,500,000