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Represents the amount of loan proceeds utilized for paying off the existing mortgage.

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The notional percentage points added to the reference rate to compute the variable rate on the debt instrument.

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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details)					1 Months Ended							6 Months Ended		12 Months Ended
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details)	Oct. 18, 2013 USD ($)	Oct. 28, 2009 USD ($) item	Mar. 07, 2005 USD ($) item	Mar. 02, 2005 USD ($) item	Aug. 31, 2014 USD ($)	Sep. 30, 2013 USD ($)	Jun. 30, 2013 USD ($)	Apr. 30, 2008 USD ($) item	Feb. 28, 2007 USD ($)	Jan. 31, 2007 USD ($)	Oct. 31, 2004 USD ($)	Jun. 30, 2015 USD ($) item	Jun. 30, 2014 USD ($) item	Dec. 31, 2005 USD ($) item	Aug. 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												$ 7,866,077				$ 8,807,868
Borrowings												8,042,000
Outstanding amount of mortgage loan												196,005,736				$ 196,071,540
Interest paid												4,753,000	$ 4,074,000
Distribution to the Partnership												1,899,885	$ 1,935,384
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										$ 4,158,667	$ 5,175,200
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												$ 85,575,000
Hamilton Bay Apartments
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest												50.00%	50.00%						50.00%
Investments in joint venture												$ 882,693	$ 956,847						$ 2,500,000
Total \| item												48	48		7				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												$ 4,539,000
Hamilton Bay Sales
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest												50.00%	50.00%
Investments in joint venture												$ 398,370	$ 858,487
Total \| item												120	120
Capital contributions	$ 660,000
Number of units sold \| item												113	110
Number of Units in Real Estate Property to be Sold \| item												120	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												$ 277,674	$ 227,301
Total \| item			48									49	49
Number of properties \| item			1
Number of units retained for long-term investment \| item												49	49
Hamilton Essex 81 \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Borrowings												$ 8,042,000
Interest rate (as a percent)												5.79%
Amortization period of debt												30 years
Hamilton Essex Development
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest												50.00%	50.00%
Investments in joint venture												$ 344,270	$ 359,163
Total \| item												1	1
Number of units retained for long-term investment \| item												1	1
Capacity of real estate property (in cars per lot) \| item			50
Hamilton Essex Development \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Borrowings												$ 1,961,000
Contractual principal payments to be made						$ 4,443
Margin over basis of interest rate (as a percent)												2.25%
Basis of interest rate												Libor
Notional margin over basis of interest rate (as a percent)												0.1865%
Cost associated with loan extension						$ 9,000
Extended term of debt						2 years
Maximum personal guaranty on mortgage						$ 1,000,000
Debt Instrument, Basis Spread on Variable Rate												2.25%
Hamilton 1025
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Percentage of ownership interest				50.00%								50.00%	50.00%
Investments in joint venture				$ 2,352,000								$ 145,287	$ 213,573
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												$ 4,770,000
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												$ 577,549	$ 688,907							$ 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												$ 5,253,000
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												$ 1,081,568	$ 2,520,365								$ 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%