TAXABLE INCOME AND TAX BASIS (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
TAXABLE INCOME AND TAX BASIS
Excess amount of statement income over taxable income									$ 4,300,000
Book/Tax differences on tax free exchanges									4,670,000	(266,000)	7,707,000
Reconciliation of Income from Book Basis to Tax Basis Depreciation and Amortization									300,000	(51,000)	1,024,000
Excess amount of cumulative statement basis over cumulative taxable basis	4,800,000								4,800,000
Excess amount of statement income from joint venture investments over taxable income									1,300,000
Reconciliation of GAAP net income to taxable income
Financial statement ("book") net income (loss)	317,518	(32,874)	4,469,116	901,625	1,185,130	774,453	1,047,262	626,954	5,655,385	3,633,798	9,291,281
Book/Tax differences from depreciation and amortization									(300,000)	51,000	(1,024,000)
Book/Tax differences on tax free exchanges									(4,670,000)	266,000	(7,707,000)
Book/Tax differences from Investment Properties									400,000	198,000	(161,000)
Increase (Decrease) in prepaid rent and allowances									175,000	(40,000)	29,000
Other									50,000	57,000	7,000
Taxable income (loss)									1,310,000	4,166,000	435,000
Hamilton Green
TAXABLE INCOME AND TAX BASIS
Reconciliation of Income from Book Basis to Tax Basis Depreciation and Amortization									1,100,000
Reconciliation of GAAP net income to taxable income
Book/Tax differences from depreciation and amortization									(1,100,000)
Nashoba Apartments in Acton, Massachusetts
TAXABLE INCOME AND TAX BASIS
Book/Tax differences on tax free exchanges									3,700,000
Reconciliation of GAAP net income to taxable income
Book/Tax differences on tax free exchanges									$ (3,700,000)