INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Balance Sheet) (Details)	Sep. 30, 2018 USD ($) property item	Dec. 31, 2017 USD ($) item	Sep. 30, 2017 USD ($) item	Oct. 28, 2009 USD ($) item	Oct. 03, 2005 USD ($) item	Mar. 07, 2005 item	Mar. 02, 2005 USD ($) item	Sep. 30, 2004 USD ($) item	Aug. 31, 2004 USD ($) item	Nov. 30, 2001 USD ($) item
ASSETS
Rental Properties			$ 136,236,448
Cash & Cash Equivalents			1,868,209
Rent Receivable			212,781
Real Estate Tax Escrow			692,490
Prepaid Expenses & Other Assets			2,926,955
Total Assets			141,936,883
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable			124,550,899
Accounts Payable and Accrued Expenses			1,249,412
Advance Rental Payments and Security Deposits			3,250,170
Total Liabilities			129,050,481
Partners' Capital			12,886,402
Total Liabilities and Capital			141,936,883
Investment in Unconsolidated Joint Ventures	$ 1,804,747	$ 7,212,044	8,452,484
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	(18,001,998)	$ (2,806,319)	(2,737,854)
Total Investment in Unconsolidated Joint Ventures (Net)			$ 5,714,630
Total units/ condominiums
Total | item			1,033
Units to be retained | item			690
Units to be sold | item			343
Units sold | item			297
Unsold units | item			46
Units unsold with deposits for future sale | item			10
Residential buildings
Total units/ condominiums
Total | item			1,030
Commercial
Total units/ condominiums
Total | item			3
Investment Properties
ASSETS
Rental Properties	127,205,942
Cash & Cash Equivalents	2,141,341
Rent Receivable	437,357
Real Estate Tax Escrow	257,730
Prepaid Expenses & Other Assets	1,718,546
Total Assets	131,760,916
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	166,513,618
Accounts Payable and Accrued Expenses	1,654,875
Advance Rental Payments and Security Deposits	3,406,035
Total Liabilities	171,574,528
Partners' Capital	(39,813,612)
Total Liabilities and Capital	131,760,916
Investment in Unconsolidated Joint Ventures	1,804,747
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	(18,001,998)
Total Investment in Unconsolidated Joint Ventures (Net)	$ (16,197,251)
Total units/ condominiums
Total | property	913
Units to be retained | property	690
Units to be sold | property	223
Units sold | property	217
Unsold units | property	6
Units unsold with deposits for future sale | property	3
Investment Properties | Residential buildings
Total units/ condominiums
Total | property	910
Investment Properties | Commercial
Total units/ condominiums
Total | property	3
Hamilton Essex 81
ASSETS
Rental Properties			$ 7,704,425
Cash & Cash Equivalents			147,083
Rent Receivable			17,530
Real Estate Tax Escrow			103,996
Prepaid Expenses & Other Assets			120,823
Total Assets			8,093,857
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 9,903,477		9,889,687
Accounts Payable and Accrued Expenses			90,779
Advance Rental Payments and Security Deposits			179,143
Total Liabilities			10,159,609
Partners' Capital			(2,065,752)
Total Liabilities and Capital			$ 8,093,857
Partners' Capital % - NERA			50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture			$ (1,032,876)
Total units/ condominiums
Total | item			49			48
Units to be retained | item			49
Hamilton Essex 81 | NERA 50%
ASSETS
Rental Properties	7,333,163
Cash & Cash Equivalents	116,301
Rent Receivable	129,551
Real Estate Tax Escrow	69,794
Prepaid Expenses & Other Assets	268,973
Total Assets	7,917,782
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,903,476
Accounts Payable and Accrued Expenses	219,371
Advance Rental Payments and Security Deposits	289,586
Total Liabilities	10,412,433
Partners' Capital	(2,494,651)
Total Liabilities and Capital	$ 7,917,782
Partners' Capital % - NERA	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,247,327)
Total units/ condominiums
Total | property	49
Units to be retained | property	49
Hamilton Essex 81 | Residential buildings
Total units/ condominiums
Total | item			48
Hamilton Essex 81 | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	48
Hamilton Essex 81 | Commercial
Total units/ condominiums
Total | item			1
Hamilton Essex 81 | Commercial | NERA 50%
Total units/ condominiums
Total | property	1
Hamilton Essex Development
ASSETS
Rental Properties			$ 2,622,401
Cash & Cash Equivalents			92,180
Prepaid Expenses & Other Assets			1,115
Total Assets			2,715,696
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses			1,276
Total Liabilities			1,276
Partners' Capital			2,714,420
Total Liabilities and Capital			$ 2,715,696
Partners' Capital % - NERA			50.00%
Investment in Unconsolidated Joint Ventures			$ 1,357,209
Total units/ condominiums
Total | item			1
Units to be retained | item			1
Hamilton Essex Development | NERA 50%
ASSETS
Rental Properties	$ 2,596,303
Cash & Cash Equivalents	101,948
Rent Receivable	6,800
Prepaid Expenses & Other Assets	118,872
Total Assets	2,823,923
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	1,316
Total Liabilities	1,316
Partners' Capital	2,822,607
Total Liabilities and Capital	$ 2,823,923
Partners' Capital % - NERA	50.00%
Investment in Unconsolidated Joint Ventures	$ 1,411,304
Total units/ condominiums
Total | property	1
Units to be retained | property	1
Hamilton Essex Development | Commercial
Total units/ condominiums
Total | item			1
Hamilton Essex Development | Commercial | NERA 50%
Total units/ condominiums
Total | property	1
345 Franklin
ASSETS
Rental Properties			$ 6,408,017
Cash & Cash Equivalents			67,653
Rent Receivable			32,797
Real Estate Tax Escrow			47,566
Prepaid Expenses & Other Assets			59,633
Total Assets			6,615,666
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 9,535,845		9,717,606
Accounts Payable and Accrued Expenses			78,848
Advance Rental Payments and Security Deposits			229,169
Total Liabilities			10,025,623
Partners' Capital			(3,409,957)
Total Liabilities and Capital			$ 6,615,666
Partners' Capital % - NERA			50.00%							50.00%
Investment in Unconsolidated Joint Ventures										$ 1,533,000
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture			$ (1,704,979)
Total units/ condominiums
Total | item			40							40
Units to be retained | item			40
345 Franklin | NERA 50%
ASSETS
Rental Properties	6,092,507
Cash & Cash Equivalents	56,599
Rent Receivable	13,680
Real Estate Tax Escrow	50,280
Prepaid Expenses & Other Assets	73,892
Total Assets	6,286,958
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,535,846
Accounts Payable and Accrued Expenses	100,067
Advance Rental Payments and Security Deposits	239,839
Total Liabilities	9,875,752
Partners' Capital	(3,588,794)
Total Liabilities and Capital	$ 6,286,958
Partners' Capital % - NERA	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,794,398)
Total units/ condominiums
Total | property	40
Units to be retained | property	40
345 Franklin | Residential buildings
Total units/ condominiums
Total | item			40
345 Franklin | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	40
Hamilton 1025
ASSETS
Rental Properties			$ 2,155,441
Cash & Cash Equivalents			200,845
Rent Receivable			10,388
Prepaid Expenses & Other Assets			704,019
Total Assets			3,070,693
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses			35,139
Advance Rental Payments and Security Deposits			25,656
Total Liabilities			60,795
Partners' Capital			3,009,898
Total Liabilities and Capital			$ 3,070,693
Partners' Capital % - NERA			50.00%				50.00%
Investment in Unconsolidated Joint Ventures			$ 1,504,948				$ 2,352,000
Total units/ condominiums
Total | item	3		176				176
Units to be retained | item			1				(49)
Units to be sold | item			176
Units sold | item	15	20	155				127
Unsold units | item			20
Units unsold with deposits for future sale | item			4
Hamilton 1025 | NERA 50%
ASSETS
Rental Properties	$ 231,176
Cash & Cash Equivalents	57,985
Rent Receivable	6,105
Prepaid Expenses & Other Assets	38,080
Total Assets	333,346
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	54,270
Advance Rental Payments and Security Deposits	8,440
Total Liabilities	62,710
Partners' Capital	270,636
Total Liabilities and Capital	$ 333,346
Partners' Capital % - NERA	50.00%
Investment in Unconsolidated Joint Ventures	$ 135,318
Total units/ condominiums
Total | property	176
Units to be retained | property	1
Units to be sold | property	175
Units sold | property	173
Unsold units | property	2
Hamilton 1025 | Residential buildings
Total units/ condominiums
Total | item			175
Hamilton 1025 | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	175
Hamilton 1025 | Commercial
Total units/ condominiums
Total | item			1
Hamilton 1025 | Commercial | NERA 50%
Total units/ condominiums
Total | property	1
Hamilton Bay Sales
ASSETS
Rental Properties			$ 0
Cash & Cash Equivalents			20,890
Rent Receivable			1,480
Prepaid Expenses & Other Assets			263
Total Assets			22,633
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses			1,671
Advance Rental Payments and Security Deposits			101
Total Liabilities			1,772
Partners' Capital			20,861
Total Liabilities and Capital			$ 22,633
Partners' Capital % - NERA			50.00%
Investment in Unconsolidated Joint Ventures			$ 10,431
Total units/ condominiums
Total | item	4		120
Units to be sold | item			120
Units sold | item			120
Unsold units | item			0
Hamilton Bay Sales | Residential buildings
Total units/ condominiums
Total | item			120
Hamilton Bay Apts
ASSETS
Rental Properties			$ 3,438,875
Cash & Cash Equivalents			583,983
Rent Receivable			7,110
Prepaid Expenses & Other Assets			501,895
Total Assets			4,531,863
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses			28,806
Advance Rental Payments and Security Deposits			25,355
Total Liabilities			54,161
Partners' Capital			4,477,702
Total Liabilities and Capital			$ 4,531,863
Partners' Capital % - NERA			50.00%		50.00%
Investment in Unconsolidated Joint Ventures			$ 2,238,850		$ 2,500,000
Total units/ condominiums
Total | item			48		168
Units to be retained | item					(48)
Units to be sold | item			48
Units sold | item			22		120
Unsold units | item			26
Units unsold with deposits for future sale | item			6
Hamilton Bay Apts | NERA 50%
ASSETS
Rental Properties	$ 459,036
Cash & Cash Equivalents	52,371
Rent Receivable	3,295
Real Estate Tax Escrow	0
Prepaid Expenses & Other Assets	42,375
Total Assets	557,077
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	38,861
Advance Rental Payments and Security Deposits	1,965
Total Liabilities	40,826
Partners' Capital	516,251
Total Liabilities and Capital	$ 557,077
Partners' Capital % - NERA	50.00%
Investment in Unconsolidated Joint Ventures	$ 258,126
Total units/ condominiums
Total | property	48
Units to be sold | property	48
Units sold | property	44
Unsold units | property	4
Units unsold with deposits for future sale | property	3
Hamilton Bay Apts | Residential buildings
Total units/ condominiums
Total | item			48
Hamilton Bay Apts | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	48
Hamilton Minuteman
ASSETS
Rental Properties			$ 5,953,334
Cash & Cash Equivalents			55,114
Rent Receivable			4,291
Real Estate Tax Escrow			22,865
Prepaid Expenses & Other Assets			34,110
Total Assets			6,069,714
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 5,893,955		5,885,772
Accounts Payable and Accrued Expenses			68,147
Advance Rental Payments and Security Deposits			96,224
Total Liabilities			6,050,143
Partners' Capital			19,571
Total Liabilities and Capital			$ 6,069,714
Partners' Capital % - NERA			50.00%					50.00%
Investment in Unconsolidated Joint Ventures			$ 9,786					$ 5,075,000
Total units/ condominiums
Total | item			42					42
Units to be retained | item			42
Hamilton Minuteman | NERA 50%
ASSETS
Rental Properties	5,718,041
Cash & Cash Equivalents	89,079
Rent Receivable	6,254
Real Estate Tax Escrow	33,038
Prepaid Expenses & Other Assets	23,617
Total Assets	5,870,029
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	5,893,955
Accounts Payable and Accrued Expenses	74,553
Advance Rental Payments and Security Deposits	118,562
Total Liabilities	6,087,070
Partners' Capital	(217,041)
Total Liabilities and Capital	$ 5,870,029
Partners' Capital % - NERA	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (108,522)
Total units/ condominiums
Total | property	42
Units to be retained | property	42
Hamilton Minuteman | Residential buildings
Total units/ condominiums
Total | item			42
Hamilton Minuteman | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	42
Hamilton on Main Apts
ASSETS
Rental Properties			$ 17,776,990
Cash & Cash Equivalents			33,918
Rent Receivable			16,545
Real Estate Tax Escrow			220,804
Prepaid Expenses & Other Assets			99,569
Total Assets			18,147,826
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 16,805,030		16,788,979
Accounts Payable and Accrued Expenses			159,754
Advance Rental Payments and Security Deposits			365,091
Total Liabilities			17,313,824
Partners' Capital			834,002
Total Liabilities and Capital			$ 18,147,826
Partners' Capital % - NERA			50.00%						50.00%
Investment in Unconsolidated Joint Ventures			$ 417,000						$ 8,000,000
Total units/ condominiums
Total | item			148						280
Units to be retained | item			148
Units sold | item									137
Hamilton on Main Apts | NERA 50%
ASSETS
Rental Properties	16,896,745
Cash & Cash Equivalents	275,344
Rent Receivable	28,594
Real Estate Tax Escrow	104,618
Prepaid Expenses & Other Assets	77,662
Total Assets	17,382,963
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	16,805,030
Accounts Payable and Accrued Expenses	202,350
Advance Rental Payments and Security Deposits	402,612
Total Liabilities	17,409,992
Partners' Capital	(27,029)
Total Liabilities and Capital	$ 17,382,963
Partners' Capital % - NERA	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (13,515)
Total units/ condominiums
Total | property	148
Units to be retained | property	148
Hamilton on Main Apts | Residential buildings
Total units/ condominiums
Total | item			148
Hamilton on Main Apts | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	148
Dexter Park
ASSETS
Rental Properties			$ 90,176,965
Cash & Cash Equivalents			666,543
Rent Receivable			122,640
Real Estate Tax Escrow			297,259
Prepaid Expenses & Other Assets			1,405,528
Total Assets			92,668,935
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 124,375,311		82,268,855
Accounts Payable and Accrued Expenses			784,992
Advance Rental Payments and Security Deposits			2,329,431
Total Liabilities			85,383,278
Partners' Capital			7,285,657
Total Liabilities and Capital			$ 92,668,935
Partners' Capital % - NERA			40.00%	40.00%
Investment in Unconsolidated Joint Ventures			$ 2,914,262	$ 15,925,000
Total units/ condominiums
Total | item			409	409
Units to be retained | item			409
Dexter Park | NERA 40%
ASSETS
Rental Properties	87,878,971
Cash & Cash Equivalents	1,391,714
Rent Receivable	243,078
Real Estate Tax Escrow	0
Prepaid Expenses & Other Assets	1,075,075
Total Assets	90,588,838
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	124,375,311
Accounts Payable and Accrued Expenses	964,087
Advance Rental Payments and Security Deposits	2,345,031
Total Liabilities	127,684,429
Partners' Capital	(37,095,591)
Total Liabilities and Capital	$ 90,588,838
Partners' Capital % - NERA	40.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (14,838,237)
Total units/ condominiums
Total | property	409
Units to be retained | property	409
Dexter Park | Residential buildings
Total units/ condominiums
Total | item			409
Dexter Park | Residential buildings | NERA 40%
Total units/ condominiums
Total | property	409