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Represents the cost associated with the extension of mortgage loan.

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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details)						1 Months Ended						9 Months Ended		12 Months Ended
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details)	Sep. 28, 2015 USD ($)	Oct. 18, 2013 USD ($)	Oct. 28, 2009 USD ($) item	Mar. 07, 2005 USD ($) item	Mar. 02, 2005 USD ($) item	Aug. 31, 2014 USD ($)	Jun. 30, 2013 USD ($)	Apr. 30, 2008 USD ($) item	Feb. 28, 2007 USD ($)	Jan. 31, 2007 USD ($)	Oct. 31, 2004 USD ($)	Sep. 30, 2015 USD ($) item	Sep. 30, 2014 USD ($) item	Dec. 31, 2005 USD ($) item	Nov. 01, 2015 item	Dec. 31, 2014 USD ($)	May. 31, 2008 item	Dec. 31, 2006 USD ($)	Oct. 03, 2005 USD ($) item	Sep. 30, 2004 USD ($) item	Aug. 31, 2004 USD ($) item	Nov. 30, 2001 USD ($) item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of limited partnerships and limited liability companies in which the entity has invested \| item												9
Number of partnerships investing in commercial property \| item												3
Investments in joint venture												$ 8,299,289				$ 8,807,868
Outstanding amount of mortgage loan												195,972,822				$ 196,071,540
Interest paid												7,214,000	$ 6,444,000
Distribution to the Partnership												2,845,573	$ 2,898,801
Carrying value of investment to discontinue applying the equity method												$ 0
Limited Partnerships
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Capital contributions		$ 660,000
Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest			40.00%									40.00%	40.00%
Investments in joint venture			$ 15,925,000									$ 4,003,209	$ 4,931,804
Total \| item			409									409	409
Purchase price of investments			$ 129,500,000
Number of units retained for long-term investment \| item												409	409
Dexter Park \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Borrowings			$ 89,914,000
Interest rate (as a percent)			5.57%
Period for which the entity is required to make interest only payments			2 years
Amortization period of debt			30 years
Outstanding amount of mortgage loan												$ 85,248,000
Hamilton Bay Apartments
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest												50.00%	50.00%						50.00%
Investments in joint venture												$ 864,149	$ 943,633						$ 2,500,000
Total \| item												48	48		6				168
Purchase price of investments																			$ 30,875,000
Borrowings									$ 4,750,000
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
Number of units retained for long-term investment \| item												48	48						48
Number of units sold \| item																			120
Hamilton Bay Apartments \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Outstanding amount of mortgage loan												$ 4,522,000
Hamilton Bay Sales
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest												50.00%	50.00%
Investments in joint venture												$ 431,978	$ 522,876
Total \| item												120	120
Capital contributions		$ 660,000
Number of units retained for long-term investment \| item													0
Number of units sold \| item												120	111
Number of Units in Real Estate Property to be Sold \| item												114	120
Hamilton Bay Sales \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Total \| item								20
Borrowings								$ 2,368,000
Interest rate (as a percent)								5.75%
Hamilton Essex Development, LLC and Hamilton Essex 81, LLC
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest				50.00%
Investments in joint venture				$ 2,000,000
Purchase price of investments				14,300,000
Hamilton Essex Development, LLC and Hamilton Essex 81, LLC \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Borrowings				$ 10,750,000
Hamilton Essex 81
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest												50.00%	50.00%
Investments in joint venture													$ 214,344
Total \| item				48								49	49
Number of properties \| item				1
Number of units retained for long-term investment \| item												49	49
Cash inflow for its share of excess proceeds												$ 978,193
Hamilton Essex 81 \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Borrowings												$ 10,000,000
Term of debt												10 years
Debt Instrument, Loan Proceeds Utilized to Pay Off Existing Mortgage												$ 8,040,719
Hamilton Essex 81 \| London Interbank Offered Rate \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Margin over basis of interest rate (as a percent)												2.18%
Hamilton Essex Development
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest												50.00%	50.00%
Investments in joint venture												$ 1,350,190	$ 361,891
Total \| item												1	1
Capital contributions	$ 978,193
Number of units retained for long-term investment \| item												1	1
Capacity of real estate property (in cars per lot) \| item				50
Additional Capital Contribution	100,000
Hamilton Essex Development \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Repayment of loan	$ 1,952,286
Hamilton 1025
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest					50.00%							50.00%	50.00%
Investments in joint venture					$ 2,352,000							$ 135,475	$ 205,061
Total \| item					176							176	176
Purchase price of investments					$ 23,750,000
Number of units retained for long-term investment \| item					49							49	49
Number of units sold \| item					127							127	127
Number of Units in Real Estate Property to be Sold \| item												127	127
Hamilton 1025 \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Borrowings					$ 5,000,000
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
Outstanding amount of mortgage loan												$ 4,752,000
Term of debt					10 years
Hamilton Minuteman
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest												50.00%	50.00%							50.00%
Investments in joint venture												$ 558,209	$ 652,833							$ 5,075,000
Total \| item												42	42							42
Purchase price of investments																				$ 10,100,000
Number of units retained for long-term investment \| item												42	42
Amount returned to partnership											$ 3,775,000
Cash contribution by the entity towards loan																		$ 1,250,000
Hamilton Minuteman \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Borrowings										$ 5,500,000	$ 8,025,000
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
Outstanding amount of mortgage loan												$ 5,233,000
Term of debt										10 years
Hamilton on Main Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest												50.00%	50.00%								50.00%
Investments in joint venture												$ 956,081	$ 1,510,654								$ 8,000,000
Total \| item												148	148								280
Purchase price of investments																					$ 56,000,000
Number of units retained for long-term investment \| item												148	148
Number of units sold \| item																	137
Hamilton on Main Apartments, LLC \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of properties \| item														3
Borrowings						$ 16,900,000								$ 16,825,000
Interest rate (as a percent)						4.34%								5.18%
Period for which the entity is required to make interest only payments														3 years
Amortization period of debt														30 years
Term of debt						10 years								10 years
Cost associated with loan extension						$ 161,000
Term excluding period for which interest only payments to be made														7 years
Net proceeds after funding escrow accounts and closing costs														$ 16,700,000
Debt Instrument, Loan Proceeds Utilized to Pay Off Existing Mortgage						15,205,000
Debt Instrument, Loan Proceeds distributed to the Partnership						$ 850,000
345 Franklin
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest												50.00%	50.00%									50.00%
Investments in joint venture																						$ 1,533,000
Total \| item												40	40									40
Number of units retained for long-term investment \| item												40	40
Distribution to the Partnership							$ 1,610,000
Carrying value of investment to discontinue applying the equity method							0
345 Franklin \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Borrowings							$ 10,000,000
Interest rate (as a percent)							3.87%
Period for which the entity is required to make interest only payments							3 years
Amortization period of debt							30 years
Term of debt							15 years
Repayment of loan							$ 6,776,000
Residential buildings \| Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Total \| item												409	409
Residential buildings \| Hamilton Bay Apartments
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Total \| item												48	48
Residential buildings \| Hamilton Bay Sales
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Total \| item												120	120
Residential buildings \| Hamilton Essex 81
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Total \| item												48	48
Residential buildings \| Hamilton 1025
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Total \| item												175	175
Residential buildings \| Hamilton Minuteman
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Total \| item												42	42
Residential buildings \| Hamilton on Main Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Total \| item												148	148
Residential buildings \| 345 Franklin
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Total \| item												40	40
Commercial \| Hamilton Essex 81
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Total \| item												1	1
Commercial \| Hamilton Essex Development
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Total \| item												1	1
Commercial \| Hamilton 1025
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Total \| item												1	1
Management Company
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of employees having ownership interest in the investment properties \| item												6
Minimum \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)												3.76%
Minimum \| Limited Partnerships
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest												40.00%
Minimum \| Harold Brown
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest												43.20%
Maximum \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)												5.97%
Maximum \| Limited Partnerships
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest												50.00%
Maximum \| Harold Brown
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest												57.00%