INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details 4) (USD $)	Dec. 31, 2012
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
12/31/2013	$ 41,275,000
12/31/2014	14,669,000
12/31/2015	2,184,000
12/31/2016	194,000
12/31/2017	205,000
Thereafter	79,529,000
Total	138,056,000
Weighted average interest rate (as a percent)c	5.65%
Effective interest rate (as a percent)	5.65%
Hamilton Essex 81
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
12/31/2013	125,660
12/31/2014	133,132
12/31/2015	141,048
12/31/2016	7,952,477
Total	8,352,317
Hamilton Essex Development
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
12/31/2013	2,093,184
Total	2,093,184
345 Franklin
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
12/31/2013	165,412
12/31/2014	6,684,767
Total	6,850,179
Hamilton 1025
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
12/31/2013	65,157
12/31/2014	69,003
12/31/2015	73,077
12/31/2016	4,727,503
Total	4,934,741
Hamilton Bay Sales
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
12/31/2013	1,668,000
Total	1,668,000
Hamilton Bay
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
12/31/2013	66,163
12/31/2014	69,944
12/31/2015	73,941
12/31/2016	78,166
12/31/2017	4,413,873
Total	4,702,087
Hamilton Minuteman
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
12/31/2013	71,363
12/31/2014	75,575
12/31/2015	80,036
12/31/2016	77,128
12/31/2017	5,129,371
Total	5,433,472
Hamilton on Main
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
12/31/2013	293,222
12/31/2014	309,178
12/31/2015	15,008,646
Total	15,611,045
Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
12/31/2013	1,275,835
12/31/2014	1,348,741
12/31/2015	1,425,814
12/31/2016	1,507,291
12/31/2017	1,593,424
Thereafter	81,460,581
Total	88,611,686
Total
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
12/31/2013	7,082,229
12/31/2014	10,020,473
12/31/2015	18,208,704
12/31/2016	15,829,060
12/31/2017	12,708,108
Thereafter	163,299,264
Total	$ 138,256,711