TAXABLE INCOME AND TAX BASIS (Details) (USD $)	12 Months Ended	1 Months Ended	3 Months Ended
	Dec. 31, 2012	May 31, 2013 Nashoba Apartments in Acton, Massachusetts	Jun. 30, 2013 Nashoba Apartments in Acton, Massachusetts
TAXABLE INCOME AND TAX BASIS
Excess amount of taxable income over statement income	$ 530,000
Excess amount of cumulative statement basis over cumulative taxable basis	12,000,000
Excess amount of statement income from joint venture investments over taxable income	1,700,000
TAXABLE INCOME AND TAX BASIS
Sales price of real estate properties		4,300,000	4,300,000
Gain on sale of property		$ 3,679,000