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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details) (USD $)	9 Months Ended			9 Months Ended			9 Months Ended				1 Months Ended					1 Months Ended				1 Months Ended			1 Months Ended	9 Months Ended			1 Months Ended				1 Months Ended							1 Months Ended				9 Months Ended				12 Months Ended					1 Months Ended	9 Months Ended																											1 Months Ended							3 Months Ended	9 Months Ended			1 Months Ended						3 Months Ended	9 Months Ended					9 Months Ended		9 Months Ended			9 Months Ended
	Sep. 30, 2012 item	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 Hamilton Park Towers, LLC item	Sep. 30, 2011 Hamilton Park Towers, LLC item	Oct. 28, 2009 Hamilton Park Towers, LLC	Sep. 30, 2012 Hamilton Park Towers, LLC Mortgage loan	Sep. 30, 2012 Hamilton Bay Apartments, LLC item	Sep. 30, 2011 Hamilton Bay Apartments, LLC item	Apr. 30, 2008 Hamilton Bay Apartments, LLC item	Feb. 28, 2007 Hamilton Bay Apartments, LLC Mortgage loan	Sep. 30, 2012 Hamilton Bay Apartments, LLC Mortgage loan	Sep. 30, 2012 Hamilton Bay, LLC item	Sep. 30, 2011 Hamilton Bay, LLC item	Oct. 03, 2005 Hamilton Bay, LLC item	Apr. 30, 2008 Hamilton Bay, LLC Mortgage loan	Nov. 30, 2012 Hamilton Bay, LLC Mortgage loan item	Sep. 30, 2012 Hamilton Bay, LLC Mortgage loan	Mar. 07, 2005 Hamilton Essex Development, LLC and Hamilton Essex 81, LLC	Mar. 31, 2005 Hamilton Essex Development, LLC and Hamilton Essex 81, LLC Mortgage loan	Sep. 30, 2012 Hamilton Essex 81, LLC item	Sep. 30, 2011 Hamilton Essex 81, LLC item	Aug. 31, 2008 Hamilton Essex 81, LLC Mortgage loan	Sep. 30, 2012 Hamilton Essex 81, LLC Mortgage loan	Sep. 30, 2012 Hamilton Essex Development, LLC item	Sep. 30, 2011 Hamilton Essex Development, LLC item	Aug. 31, 2008 Hamilton Essex Development, LLC Mortgage loan	Sep. 30, 2012 Hamilton 1025, LLC item	Sep. 30, 2011 Hamilton 1025, LLC item	Mar. 02, 2005 Hamilton 1025, LLC item	Mar. 31, 2005 Hamilton 1025, LLC Mortgage loan	Sep. 30, 2012 Hamilton 1025, LLC Mortgage loan	Mar. 02, 2005 Hamilton 1025, LLC Mortgage loan	Sep. 30, 2012 Hamilton Minuteman, LLC item	Sep. 30, 2011 Hamilton Minuteman, LLC item	Oct. 31, 2004 Hamilton Minuteman, LLC	Sep. 30, 2004 Hamilton Minuteman, LLC item	Jan. 31, 2007 Hamilton Minuteman, LLC Mortgage loan	Oct. 31, 2004 Hamilton Minuteman, LLC Mortgage loan	Sep. 30, 2012 Hamilton Minuteman, LLC Mortgage loan	Dec. 31, 2006 Hamilton Minuteman, LLC Mortgage loan	Sep. 30, 2012 Hamilton on Main, LLC item	Sep. 30, 2011 Hamilton on Main, LLC item	May 31, 2008 Hamilton on Main, LLC item	Aug. 31, 2004 Hamilton on Main, LLC item	Dec. 31, 2005 Hamilton on Main Apartments, LLC Mortgage loan	Sep. 30, 2012 Hamilton on Main Apartments, LLC Mortgage loan	Sep. 30, 2012 345 Franklin, LLC item	Sep. 30, 2011 345 Franklin, LLC item	Nov. 30, 2001 345 Franklin, LLC item	Nov. 30, 2001 345 Franklin, LLC Mortgage loan	Sep. 30, 2012 345 Franklin, LLC Mortgage loan	Sep. 30, 2012 Residential buildings Hamilton Park Towers, LLC item	Sep. 30, 2011 Residential buildings Hamilton Park Towers, LLC item	Sep. 30, 2012 Residential buildings Hamilton Bay Apartments, LLC item	Sep. 30, 2011 Residential buildings Hamilton Bay Apartments, LLC item	Sep. 30, 2012 Residential buildings Hamilton Bay, LLC item	Sep. 30, 2011 Residential buildings Hamilton Bay, LLC item	Sep. 30, 2012 Residential buildings Hamilton Essex 81, LLC item	Sep. 30, 2011 Residential buildings Hamilton Essex 81, LLC item	Sep. 30, 2012 Residential buildings Hamilton 1025, LLC item	Sep. 30, 2011 Residential buildings Hamilton 1025, LLC item	Sep. 30, 2012 Residential buildings Hamilton Minuteman, LLC item	Sep. 30, 2011 Residential buildings Hamilton Minuteman, LLC item	Sep. 30, 2012 Residential buildings Hamilton on Main, LLC item	Sep. 30, 2011 Residential buildings Hamilton on Main, LLC item	Sep. 30, 2012 Residential buildings 345 Franklin, LLC item	Sep. 30, 2011 Residential buildings 345 Franklin, LLC item	Mar. 07, 2005 Apartment Hamilton Essex Development, LLC and Hamilton Essex 81, LLC item	Mar. 07, 2005 Commercial Hamilton Essex Development, LLC and Hamilton Essex 81, LLC item	Sep. 30, 2012 Commercial Hamilton Essex 81, LLC item	Sep. 30, 2011 Commercial Hamilton Essex 81, LLC item	Sep. 30, 2012 Commercial Hamilton Essex Development, LLC item	Sep. 30, 2011 Commercial Hamilton Essex Development, LLC item	Sep. 30, 2012 Commercial Hamilton 1025, LLC item	Sep. 30, 2011 Commercial Hamilton 1025, LLC item	Mar. 07, 2005 Car parking lot Hamilton Essex Development, LLC and Hamilton Essex 81, LLC item	Aug. 31, 2008 Harold Brown Hamilton Essex Development, LLC Mortgage loan	Apr. 30, 2012 HBC	Feb. 29, 2012 HBC	Dec. 31, 2011 HBC	Oct. 31, 2011 HBC	Aug. 31, 2011 HBC	Aug. 31, 2010 HBC	Oct. 31, 2009 HBC	Dec. 31, 2010 HBC	Sep. 30, 2012 HBC	Sep. 30, 2011 HBC	Oct. 28, 2009 HBC	Apr. 30, 2012 HBC Hamilton Park Towers, LLC Mortgage loan	Feb. 29, 2012 HBC Hamilton Park Towers, LLC Mortgage loan	Dec. 31, 2011 HBC Hamilton Park Towers, LLC Mortgage loan	Oct. 31, 2011 HBC Hamilton Park Towers, LLC Mortgage loan	Aug. 31, 2011 HBC Hamilton Park Towers, LLC Mortgage loan	Aug. 31, 2010 HBC Hamilton Park Towers, LLC Mortgage loan	Dec. 31, 2010 HBC Hamilton Park Towers, LLC Mortgage loan	Sep. 30, 2012 HBC Hamilton Park Towers, LLC Mortgage loan	Sep. 30, 2011 HBC Hamilton Park Towers, LLC Mortgage loan	Sep. 30, 2012 Management Company item	Sep. 30, 2012 Minimum Mortgage loan	Sep. 30, 2012 Minimum Limited Partnerships	Sep. 30, 2012 Minimum Hamilton on Main, LLC	Sep. 30, 2012 Minimum Harold Brown	Sep. 30, 2012 Minimum Harold Brown Hamilton Bay, LLC	Sep. 30, 2012 Maximum Mortgage loan	Sep. 30, 2012 Maximum Limited Partnerships	Sep. 30, 2012 Maximum Hamilton on Main, LLC	Sep. 30, 2012 Maximum Harold Brown
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
Percentage of ownership interest															50.00%				50.00%											50.00%							50.00%								50.00%					50.00%																																																			40.00%		43.20%			50.00%		57.00%
Number of employees having ownership interest																																																																																																			6
Investments in joint venture	$ 14,786,580		$ 16,780,657			$ 15,925,000									$ 2,500,000				$ 2,000,000											$ 2,352,000							$ 5,075,000								$ 8,000,000					$ 1,533,000
Number of units	120			409	409			120	120	20			48	48	168						49	49			1	1		176	176	176				42	42		42					148	148		280			40	40	40			409	409	120	120	48	48	48	48	175	175	42	42	148	148	40	40	49		1	1	1	1	1	1
Number of properties																																																																						1
Purchase price of investments						129,500,000									30,875,000				14,300,000											23,750,000							10,100,000								56,000,000
Borrowings							89,914,000				4,750,000					2,368,000				10,750,000			8,380,000				2,106,000				5,000,000							5,500,000	8,025,000							16,825,000																																							7,168,000												7,168,000
Interest rate (as a percent)							5.57%				5.57%					5.75%							5.79%										5.67%					5.67%								5.18%					6.90%																																						6.00%								6.00%			4.25%					7.07%
Interest rate (as a percent)																																																																																																				2.50%
Interest rate (as a percent)																																																																																																									6.90%
Period for which the entity is required to make interest only payments							2 years				5 years																				5 years							5 years								3 years
Amortization period of debt							30 years				30 years												30 years	30 years							30 years							30 years								30 years					30 years
Outstanding amount of mortgage loan	138,335,670		139,161,612	88,891,126	89,914,000			1,668,000	1,668,000			4,717,000	4,716,555	4,750,000				1,668,000			8,379,679	8,487,795			2,106,087	2,157,699		4,949,865	500,000			4,950,000		5,450,034	5,500,000					5,450,000		15,680,318	15,952,852				15,680,000	6,893,510	7,059,569			6,894,000																													1,668,600											1,668,600
Investments funded using cash reserves							8,757,000
Term of debt																															10 years							10 years								10 years					12 years																																		4 years												4 years
Notice period for principal paydown of debt																																																																																				6 months													6 months
Principal amount requested to be repaid																																																																																				2,500,000											2,500,000
Repayment of loan																																																																															918,600							2,500,000				918,600						2,500,000
Principal payments elected to be made																																																																																750,000	1,000,000	1,000,000	1,000,000								750,000	1,000,000	1,000,000	1,000,000
Interest paid	5,854,000	6,008,000																																																																																					18,960	202,000									18,960	202,000
Amortization period of intangible assets				12 months
Number of units retained for long-term investment				409	409								48	48	48						49	49			1	1		49	49	49				42	42							148	148					40	40
Number of units sold	105							105	105								105											127	127	127														137
Capacity of real estate property (in cars per lot)																																																																													50
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)																											0.22%
Principal amount of debt to be paid per month																											4,301
Cost associated with loan extension																											6,000
Limited guaranty issued by related party																																																																														1,000,000
Amount retained by partnership																																				3,775,000
Cash contribution by the entity towards loan																																									1,250,000
Ownership percentage in third party entity by majority shareholder of the General Partner																																										31.00%
Ownership percentage in third party entity by President of management company																																										5.00%
Percentage of variable commission on each sale																																																																																																						3.00%					5.00%
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
Fee for early extinguishment of debt																																														400,000
Final payment due on the maturity date																																																				$ 6,000,000
Repayment guaranty by related party (as a percent)																																																																																																								50.00%

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