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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. 18, 2013 USD ($)	Oct. 28, 2009 USD ($) item	Oct. 03, 2005 USD ($) item	Mar. 07, 2005 USD ($) item	Mar. 02, 2005 USD ($) item	Sep. 30, 2004 USD ($) item	Aug. 31, 2004 USD ($) item	Aug. 31, 2014 USD ($)	Oct. 31, 2004 USD ($)	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($) item	Feb. 01, 2016 item	Feb. 01, 2015 item	May 31, 2008 item	Dec. 31, 2006 USD ($)	Nov. 30, 2001 USD ($) item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Investments in joint venture \| $														$ 8,336,505	$ 7,819,162	$ 8,807,868
Outstanding amount of mortgage \| $														212,709,080	194,500,820
Number of units																1,033
Number of units retained for long-term investment																(786)
Number of units sold																240
Interest paid \| $														9,942,000	9,838,000	$ 8,791,000
Units to be sold																247
Distribution to the Partnership \| $														6,729,679	$ 3,785,883	$ 3,858,386
Carrying value of investment to discontinue applying the equity method \| $														0
Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Outstanding amount of mortgage \| $														$ 212,709,000
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										$ 4,639,953
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%
Investments in joint venture \| $																$ 936,692
Number of units														48	48	48
Number of units retained for long-term investment															(48)	(48)
Units to be sold														48
Hamilton Bay Apts \| Subsequent event
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Capital contributions \| $	$ 2,222,000
Repayment of loan \| $	$ 4,444,918
Hamilton Bay Sales
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)															50.00%	50.00%
Investments in joint venture \| $																$ 503,800
Number of units														120	120	120
Number of units sold																113	119	115
Capital contributions \| $					$ 660,000
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							$ 190,632
Number of units									176					176	176	176
Number of units retained for long-term investment															(48)	(49)
Number of units sold														10		127	139	127
Capital contributions \| $			$ 2,359,500
Units to be sold														176	127	127
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						$ 635,388
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					$ 1,250,676
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)	(786)
Number of units sold																	258	242
Units to be sold														344	247
Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Purchase price of real estate properties \| $						$ 129,500,000
Hamilton Bay Sales and Hamilton Bay Apartments
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units retained for long-term investment							48
Number of units sold							120
Purchase price of real estate properties \| $							$ 30,875,000
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 1025
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units retained for long-term investment									49
Number of units sold									127
Purchase price of real estate properties \| $									$ 23,750,000
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)														2.51%
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%