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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details)										1 Months Ended			12 Months Ended
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details)	Mar. 01, 2017 USD ($)	Sep. 12, 2016 USD ($)	Jul. 08, 2016 USD ($)	Sep. 30, 2015 USD ($)	Oct. 28, 2009 USD ($) item	Mar. 07, 2005 USD ($) item	Mar. 02, 2005 USD ($) item	Sep. 30, 2004 USD ($) item	Aug. 31, 2004 USD ($) item	Aug. 31, 2014 USD ($)	Feb. 28, 2007 USD ($)	Oct. 31, 2004 USD ($)	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($) item	Jan. 31, 2018 item	Feb. 01, 2016 item	Feb. 01, 2015 item	May 31, 2008 item	Dec. 31, 2006 USD ($)	Oct. 03, 2005 USD ($) item	Nov. 30, 2001 USD ($) item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Investments in joint venture \| $													$ 7,212,044	$ 8,336,505	$ 7,819,162
Outstanding amount of mortgage \| $													233,221,258	212,709,080
Number of units															1,033
Number of units retained for long-term investment															(786)
Number of units sold															242
Interest paid \| $													10,589,000	9,942,000	$ 9,838,000
Units to be sold															247
Distribution to the Partnership \| $													7,985,835	$ 6,729,679	$ 3,785,883
Carrying value of investment to discontinue applying the equity method \| $													0
Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Outstanding amount of mortgage \| $													$ 233,221,000
Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)					40.00%									40.00%	40.00%
Investments in joint venture \| $					$ 15,925,000										$ 3,862,912
Number of units													409	409	409
Number of units retained for long-term investment													(409)	(409)	(409)
Hamilton Bay Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)														50.00%	50.00%						50.00%
Investments in joint venture \| $															$ 841,266						$ 2,500,000,000,000
Number of units													48	48	48						168
Number of units retained for long-term investment														0	(48)						48
Number of units sold													29				31				120
Interest rate (as a percent)											5.57%
Period for which the entity is required to make interest only payments											5 years
Amortization period of debt											30 years
Purchase price of investments \| $																					$ 30,875,000
Capital contributions \| $	$ 2,222,000
Borrowings \| $											$ 4,750,000
Gain on Sale of Real Estate \| $													$ 3,628,000
Units to be sold													48	48
Hamilton Bay Apts \| Subsequent event
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units sold																2
Hamilton Bay Sales
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)														50.00%	50.00%
Investments in joint venture \| $															$ 287,671
Number of units													120	120	120
Number of units sold															115		120	119
Units to be sold													120	120	120
Hamilton Essex Development, LLC and Hamilton Essex 81, LLC
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)						50.00%
Investments in joint venture \| $						$ 2,000,000
Purchase price of real estate properties \| $						$ 14,300,000
Hamilton 1025
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)							50.00%							50.00%	50.00%
Investments in joint venture \| $							$ 2,352,000								$ 129,305
Number of units							176						176	176	176
Number of units retained for long-term investment							49						18	0	(48)
Number of units sold							127								127		159	139
Purchase price of investments \| $							$ 23,750,000
Capital contributions \| $			$ 2,359,500
Units to be sold													176	176	127
Hamilton 1025 \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)							5.67%
Period for which the entity is required to make interest only payments							5 years
Amortization period of debt							30 years
Borrowings \| $							$ 5,000,000
Term of debt							10 years
Hamilton 1025 \| Subsequent event
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units sold																1
Hamilton Minuteman
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)								50.00%						50.00%	50.00%
Investments in joint venture \| $								$ 5,075,000							$ 548,448
Outstanding amount of mortgage \| $													$ 6,000,000
Number of units								42					42	42	42
Number of units retained for long-term investment													(42)	(42)	(42)
Cash contribution by the entity towards loan \| $																				$ 1,250,000
Hamilton Minuteman \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Mortgage amount \| $		$ 6,000,000
Interest rate (as a percent)		3.71%
Period for which the entity is required to make interest only payments		15 years
Repayment of loan \| $		$ 5,158,000
Distribution to the Partnership \| $		$ 385,000
Hamilton on Main Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)									50.00%					50.00%	50.00%
Investments in joint venture \| $									$ 8,000,000						$ 832,780
Outstanding amount of mortgage \| $													$ 16,900,000
Number of units									280				148	148	148
Number of units retained for long-term investment													(148)	(148)	(148)
345 Franklin
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)														50.00%	50.00%							50.00%
Investments in joint venture \| $																						$ 1,533,000
Number of units													40	40	40							40
Number of units retained for long-term investment													(40)	(40)	(40)
Investment Properties
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of limited partnerships and limited liability companies in which the entity has invested													9
Number of partnerships investing in commercial property													3
Number of units													1,033	1,033
Number of units retained for long-term investment													(689)	(689)
Number of units sold																	310	258
Units to be sold													344	344
Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Purchase price of real estate properties \| $					$ 129,500,000
Hamilton Essex 81
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Outstanding amount of mortgage \| $													$ 10,000,000
Hamilton Essex 81 \| Mortgage, 2.18% Plus LIBOR, September 2015
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Mortgage amount \| $				$ 10,000,000
Hamilton Essex 81 \| Mortgage, 2.18% Plus LIBOR, September 2015 \| LIBOR
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Margin over basis of interest rate (as a percent)				2.18%
Basis of interest rate				one month LIBOR
Hamilton on Main Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units sold																			137
Purchase price of real estate properties \| $									$ 56,000,000
Distribution to the Partnership \| $										$ 850,000
Hamilton Minuteman
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Purchase price of real estate properties \| $								$ 10,100,000
Distribution to the Partnership \| $												$ 3,775,000
Residential buildings
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units															1,030
Residential buildings \| Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units													409	409	409
Residential buildings \| Hamilton Bay Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units													48	48	48
Residential buildings \| Hamilton Bay Sales
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units													120	120	120
Residential buildings \| Hamilton 1025
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units													175	175	175
Residential buildings \| Hamilton Minuteman
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units													42	42	42
Residential buildings \| Hamilton on Main Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units													148	148	148
Residential buildings \| 345 Franklin
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units													40	40	40
Residential buildings \| Investment Properties
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units													1,030	1,030
Residential buildings \| Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units					409
Apartment \| Hamilton Essex Development, LLC and Hamilton Essex 81, LLC
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units						48
Commercial
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units															3
Commercial \| Hamilton Essex Development, LLC and Hamilton Essex 81, LLC
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units						1
Commercial \| Hamilton 1025
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units													1	1	1
Commercial \| Investment Properties
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units													3	3
Car parking lot \| Hamilton Essex Development, LLC and Hamilton Essex 81, LLC
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Capacity of real estate property (in cars per lot)						50
Minimum \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)													3.24%
Minimum \| Investment Properties
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)													40.00%
Minimum \| Harold Brown \| Investment Properties
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest of related party (as a percent)													43.20%
Maximum \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)													5.97%
Maximum \| Investment Properties
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)													50.00%
Maximum \| Harold Brown \| Investment Properties
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest of related party (as a percent)													56.00%