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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details 3) (USD $) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Hamilton Essex 81 | Dec. 31, 2011 Hamilton Essex 81 | Dec. 31, 2010 Hamilton Essex 81 | Dec. 31, 2012 Hamilton Essex 81 NERA 50% | Dec. 31, 2011 Hamilton Essex 81 NERA 50% | Dec. 31, 2010 Hamilton Essex 81 NERA 50% | Dec. 31, 2012 Hamilton Essex Development | Dec. 31, 2011 Hamilton Essex Development | Dec. 31, 2010 Hamilton Essex Development | Dec. 31, 2012 Hamilton Essex Development NERA 50% | Dec. 31, 2011 Hamilton Essex Development NERA 50% | Dec. 31, 2010 Hamilton Essex Development NERA 50% | Dec. 31, 2012 345 Franklin | Dec. 31, 2011 345 Franklin | Dec. 31, 2010 345 Franklin | Nov. 30, 2001 345 Franklin | Dec. 31, 2012 345 Franklin NERA 50% | Dec. 31, 2011 345 Franklin NERA 50% | Dec. 31, 2010 345 Franklin NERA 50% | Dec. 31, 2012 Hamilton 1025 | Dec. 31, 2011 Hamilton 1025 | Dec. 31, 2010 Hamilton 1025 | Mar. 02, 2005 Hamilton 1025 | Dec. 31, 2012 Hamilton 1025 NERA 50% | Dec. 31, 2011 Hamilton 1025 NERA 50% | Dec. 31, 2010 Hamilton 1025 NERA 50% | Dec. 31, 2012 Hamilton Bay Sales | Dec. 31, 2011 Hamilton Bay Sales | Dec. 31, 2010 Hamilton Bay Sales | Oct. 03, 2005 Hamilton Bay Sales | Dec. 31, 2012 Hamilton Bay Sales NERA 50% | Dec. 31, 2011 Hamilton Bay Sales NERA 50% | Dec. 31, 2010 Hamilton Bay Sales NERA 50% | Dec. 31, 2012 Hamilton Bay | Dec. 31, 2011 Hamilton Bay | Dec. 31, 2010 Hamilton Bay | Dec. 31, 2012 Hamilton Bay NERA 50% | Dec. 31, 2011 Hamilton Bay NERA 50% | Dec. 31, 2010 Hamilton Bay NERA 50% | Dec. 31, 2012 Hamilton Minuteman | Dec. 31, 2011 Hamilton Minuteman | Dec. 31, 2010 Hamilton Minuteman | Sep. 30, 2004 Hamilton Minuteman | Dec. 31, 2012 Hamilton Minuteman NERA 50% | Dec. 31, 2011 Hamilton Minuteman NERA 50% | Dec. 31, 2010 Hamilton Minuteman NERA 50% | Dec. 31, 2012 Hamilton on Main | Dec. 31, 2011 Hamilton on Main | Dec. 31, 2010 Hamilton on Main | Aug. 31, 2004 Hamilton on Main | Dec. 31, 2012 Hamilton on Main NERA 50% | Dec. 31, 2011 Hamilton on Main NERA 50% | Dec. 31, 2010 Hamilton on Main NERA 50% | Dec. 31, 2012 Dexter Park | Dec. 31, 2011 Dexter Park | Dec. 31, 2010 Dexter Park | Oct. 28, 2009 Dexter Park | Dec. 31, 2012 Dexter Park NERA 40% | Dec. 31, 2011 Dexter Park NERA 40% | Dec. 31, 2010 Dexter Park NERA 40% | Dec. 31, 2012 Total | Dec. 31, 2011 Total | Dec. 31, 2010 Total | Dec. 31, 2012 Total NERA 50% | Dec. 31, 2011 Total NERA 50% | Dec. 31, 2010 Total NERA 50% | Dec. 31, 2012 Total NERA 40% | Dec. 31, 2011 Total NERA 40% | Dec. 31, 2010 Total NERA 40%
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  | $ 35,244,008 | $ 33,608,799 | $ 31,816,175 | $ 1,270,141 | $ 1,244,322 | $ 1,122,915 |  |  |  | $ 287,537 | $ 255,050 | $ 275,950 |  |  |  | $ 1,178,712 | $ 1,136,831 | $ 1,097,957 |  |  |  |  | $ 861,998 | $ 816,015 | $ 794,993 |  |  |  |  | $ 235,061 | $ 232,938 | $ 221,191 |  |  |  |  | $ 886,122 | $ 863,657 | $ 839,361 |  |  |  | $ 809,707 | $ 789,897 | $ 765,509 |  |  |  |  | $ 2,623,994 | $ 2,491,957 | $ 2,455,222 |  |  |  |  | $ 12,202,615 | $ 11,559,414 | $ 11,019,862 |  |  |  |  | $ 20,355,887 | $ 19,390,080 | $ 18,592,960 |  |  |  |  |  |
Laundry and sundry income |  |  |  |  |  |  |  |  | 388,401 | 426,803 | 439,782 | 15,363 | 16,589 | 16,184 |  |  |  |  |  |  |  |  |  | 1,206 | 2,367 | 2,436 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,435 | 1,362 | 762 |  |  |  |  | 20,952 | 20,599 | 19,780 |  |  |  |  | 98,042 | 97,275 | 97,902 |  |  |  |  | 137,999 | 138,193 | 137,063 |  |  |  |  |  |
Total Revenues | 9,104,015 | 8,875,596 | 8,800,416 | 8,852,382 | 8,760,538 | 8,648,526 | 8,345,643 | 8,280,894 | 35,632,409 | 34,035,602 | 32,255,957 | 1,285,504 | 1,260,911 | 1,139,099 |  |  |  | 287,537 | 255,050 | 275,950 |  |  |  | 1,179,918 | 1,139,198 | 1,100,393 |  |  |  |  | 861,998 | 816,015 | 794,993 |  |  |  |  | 235,061 | 232,938 | 221,191 |  |  |  |  | 886,122 | 863,657 | 839,361 |  |  |  | 812,142 | 791,258 | 766,271 |  |  |  |  | 2,644,946 | 2,512,556 | 2,475,002 |  |  |  |  | 12,300,657 | 11,656,690 | 11,117,764 |  |  |  |  | 20,493,885 | 19,528,273 | 18,730,023 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Administrative |  |  |  |  |  |  |  |  | 1,825,951 | 1,707,408 | 1,772,599 | 15,237 | 20,839 | 13,709 |  |  |  | 1,749 | 1,339 |  |  |  |  | 27,942 | 24,424 | 30,904 |  |  |  |  | 5,142 | 11,258 | 13,038 |  |  |  |  | 7,553 | 5,396 | 7,073 |  |  |  |  | 34,600 | 18,625 | 17,324 |  |  |  | 7,825 | 10,249 | 10,288 |  |  |  |  | 46,400 | 36,155 | 39,289 |  |  |  |  | 219,218 | 163,511 | 148,097 |  |  |  |  | 365,666 | 291,796 | 279,724 |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,092,725 | 5,910,746 | 5,531,509 | 409,488 | 424,695 | 425,450 |  |  |  | 11,638 | 8,498 | 6,254 |  |  |  | 441,704 | 443,055 | 439,666 |  |  |  |  | 256,696 | 257,961 | 269,475 |  |  |  |  | 82,287 | 103,536 | 98,678 |  |  |  |  | 297,737 | 329,930 | 359,727 |  |  |  | 317,231 | 322,216 | 320,553 |  |  |  |  | 957,452 | 965,324 | 981,881 |  |  |  |  | 5,733,920 | 5,698,657 | 9,428,284 |  |  |  |  | 8,508,153 | 8,553,872 | 12,329,966 |  |  |  |  |  |
Management fees |  |  |  |  |  |  |  |  |  |  |  | 55,308 | 49,677 | 46,734 |  |  |  | 11,502 | 11,040 | 11,040 |  |  |  | 48,596 | 45,829 | 45,559 |  |  |  |  | 34,517 | 32,120 | 31,795 |  |  |  |  | 9,894 | 9,486 | 9,245 |  |  |  |  | 34,659 | 33,916 | 33,345 |  |  |  | 32,615 | 31,666 | 31,563 |  |  |  |  | 104,807 | 100,581 | 97,239 |  |  |  |  | 261,355 | 251,071 | 244,178 |  |  |  |  | 593,253 | 565,386 | 550,698 |  |  |  |  |  |
Operating |  |  |  |  |  |  |  |  | 3,633,619 | 4,080,647 | 3,784,401 | 112,172 | 121,521 | 134,016 |  |  |  |  |  |  |  |  |  | 62,277 | 66,278 | 62,994 |  |  |  |  | 816 | 1,733 | 1,777 |  |  |  |  | 1,251 | 239 |  |  |  |  |  | 1,190 | 732 | 411 |  |  |  | 73,092 | 54,650 | 63,841 |  |  |  |  | 341,054 | 371,687 | 358,827 |  |  |  |  | 1,006,570 | 929,543 | 960,328 |  |  |  |  | 1,598,421 | 1,546,382 | 1,582,193 |  |  |  |  |  |
Renting |  |  |  |  |  |  |  |  | 183,529 | 365,110 | 528,686 | 18,350 | 8,058 | 24,785 |  |  |  |  |  |  |  |  |  | 5,326 | 19,206 | 49,517 |  |  |  |  | 6,815 | 13,322 | 8,576 |  |  |  |  | 1,894 | 1,750 | 375 |  |  |  |  | 4,053 | 8,927 | 6,213 |  |  |  | 3,538 | 3,559 | 3,770 |  |  |  |  | 10,974 | 15,140 | 15,361 |  |  |  |  | 74,705 | 144,149 | 281,545 |  |  |  |  | 125,655 | 214,111 | 390,142 |  |  |  |  |  |
Repairs and maintenance |  |  |  |  |  |  |  |  | 5,179,408 | 5,056,054 | 4,886,724 | 118,786 | 127,528 | 134,941 |  |  |  | 5,475 | 3,050 |  |  |  |  | 82,052 | 71,479 | 80,190 |  |  |  |  | 320,997 | 300,534 | 376,560 |  |  |  |  | 70,812 | 78,167 | 76,510 |  |  |  |  | 273,652 | 316,782 | 344,852 |  |  |  | 57,448 | 98,904 | 99,553 |  |  |  |  | 380,605 | 371,109 | 342,310 |  |  |  |  | 880,103 | 935,839 | 859,088 |  |  |  |  | 2,189,930 | 2,303,393 | 2,314,005 |  |  |  |  |  |
Taxes and insurance |  |  |  |  |  |  |  |  | 4,348,492 | 4,146,554 | 4,082,588 | 197,566 | 184,119 | 179,939 |  |  |  | 49,237 | 47,709 | 46,658 |  |  |  | 106,785 | 97,028 | 98,151 |  |  |  |  | 145,755 | 143,002 | 127,637 |  |  |  |  | 46,017 | 45,303 | 42,465 |  |  |  |  | 161,137 | 155,681 | 132,188 |  |  |  | 102,505 | 92,300 | 96,213 |  |  |  |  | 337,256 | 325,868 | 318,150 |  |  |  |  | 1,485,297 | 1,300,995 | 1,451,017 |  |  |  |  | 2,631,555 | 2,392,005 | 2,492,417 |  |  |  |  |  |
Total Expenses | 5,704,596 | 5,730,319 | 5,413,735 | 5,861,694 | 5,722,971 | 5,665,232 | 5,508,842 | 5,773,941 | 22,710,344 | 22,670,986 | 21,916,664 | 926,908 | 936,438 | 959,574 |  |  |  | 79,600 | 71,636 | 63,952 |  |  |  | 774,681 | 767,299 | 806,981 |  |  |  |  | 770,738 | 759,930 | 828,857 |  |  |  |  | 219,707 | 243,877 | 234,346 |  |  |  |  | 807,027 | 864,593 | 894,061 |  |  |  | 594,254 | 613,544 | 625,780 |  |  |  |  | 2,178,549 | 2,185,864 | 2,153,057 |  |  |  |  | 9,661,169 | 9,423,765 | 13,372,537 |  |  |  |  | 16,012,632 | 15,866,945 | 19,939,145 |  |  |  |  |  |
Income Before Other Income (loss) and Discontinued Operations | 3,399,419 | 3,145,277 | 3,386,681 | 2,990,688 | 3,037,567 | 2,983,294 | 2,836,801 | 2,506,953 | 12,922,065 | 11,364,616 | 10,339,293 | 358,596 | 324,473 | 179,525 |  |  |  | 207,937 | 183,414 | 211,998 |  |  |  | 405,237 | 371,899 | 293,412 |  |  |  |  | 91,260 | 56,085 | (33,864) |  |  |  |  | 15,354 | (10,939) | (13,155) |  |  |  |  | 79,095 | (936) | (54,700) |  |  |  | 217,888 | 177,714 | 140,491 |  |  |  |  | 466,397 | 326,693 | 321,944 |  |  |  |  | 2,639,488 | 2,232,924 | (2,254,773) |  |  |  |  | 4,481,253 | 3,661,328 | (1,209,122) |  |  |  |  |  |
Other Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (7,802,999) | (7,965,422) | (8,053,628) | (497,631) | (503,102) | (507,425) |  |  |  | (60,451) | (61,593) | (62,694) |  |  |  | (486,051) | (494,468) | (504,667) |  |  |  |  | (288,470) | (289,222) | (289,042) |  |  |  |  | (98,361) | (98,010) | (97,909) |  |  |  |  | (271,283) | (271,348) | (271,389) |  |  |  | (317,448) | (317,927) | (317,360) |  |  |  |  | (840,874) | (848,786) | (860,500) |  |  |  |  | (5,092,838) | (5,113,523) | (5,116,598) |  |  |  |  | (7,953,407) | (7,997,979) | (8,027,583) |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 2,216 | 3,861 | 5,932 |  |  | 3 |  |  |  |  |  | 2 |  |  |  | 48 | 49 | 47 |  |  |  |  | 74 | 88 | 90 |  |  |  |  | 215 | 457 | 569 |  |  |  |  |  |  | 2 |  |  |  |  |  | 1,780 |  |  |  |  |  |  | 8 |  |  |  |  |  | 3,219 | 5 |  |  |  |  | 337 | 3,814 | 2,505 |  |  |  |  |  |
Interest Income from Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,180 | 8,904 | 11,445 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,180 | 8,904 | 11,445 |  |  |  |  |  |
Gain on the sale of real estate |  |  |  |  |  |  |  |  |  | 7,720,459 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Income (Expenses) |  |  |  |  |  |  |  |  |  |  |  |  | (2,331) |  |  |  |  |  |  |  |  |  |  |  | (5,375) |  |  |  |  |  |  | (3,621) |  |  |  |  |  |  |  | 11,021 |  |  |  |  |  | (2,271) | 9,478 |  |  |  |  | (61,589) |  |  |  |  |  |  | (1,152) | 2,168 |  |  |  |  |  | (3,500) | (17,720) |  |  |  |  |  | (79,839) | 4,947 |  |  |  |  |  |
Total Other Income (Expense) | (2,214,288) | (2,370,824) | (2,339,420) | (2,363,735) | (2,469,002) | (2,523,314) | (2,480,305) | (2,402,740) | (9,288,267) | (9,875,361) | (11,918,392) | (497,631) | (505,433) | (507,422) |  |  |  | (60,451) | (61,593) | (62,692) |  |  |  | (486,003) | (499,793) | (504,619) |  |  |  |  | (288,395) | (292,756) | (288,952) |  |  |  |  | (91,966) | (88,649) | (74,874) |  |  |  |  | (271,283) | (273,619) | (261,909) |  |  |  | (317,448) | (379,515) | (315,581) |  |  |  |  | (840,874) | (849,938) | (858,323) |  |  |  |  | (5,092,838) | (5,113,804) | (5,134,313) |  |  |  |  | (7,946,890) | (8,065,100) | (8,008,686) |  |  |  |  |  |
Net Income (loss) | 1,185,131 | 774,453 | 1,047,261 | 626,953 | 568,257 | 456,926 | 8,093,285 | 172,812 | 3,633,798 | 9,291,281 | (1,359,232) | (139,035) | (180,960) | (327,897) |  |  |  | 147,486 | 121,821 | 149,305 |  |  |  | (80,766) | (127,894) | (211,208) |  |  |  |  | (197,135) | (236,671) | (322,816) |  |  |  |  | (76,612) | (99,588) | (88,029) |  |  |  |  | (192,188) | (274,555) | (316,608) |  |  |  | (99,560) | (201,801) | (175,090) |  |  |  |  | (374,477) | (523,245) | (536,379) |  |  |  |  | (2,453,350) | (2,880,880) | (7,389,086) |  |  |  |  | (3,465,636) | (4,403,772) | (9,217,808) |  |  |  |  |  |
Proportionate share of net loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (69,517) | $ (90,480) | $ (163,948) |  |  |  | $ 73,743 | $ 60,911 | $ 74,653 |  |  |  |  | $ (40,383) | $ (63,947) | $ (105,604) |  |  |  |  | $ (98,567) | $ (118,335) | $ (161,408) |  |  |  |  | $ (38,306) | $ (49,794) | $ (44,015) |  |  |  | $ (96,094) | $ (137,277) | $ (158,304) |  |  |  |  | $ (49,780) | $ (100,900) | $ (87,545) |  |  |  |  | $ (187,239) | $ (261,622) | $ (268,189) |  |  |  |  | $ (981,340) | $ (1,152,352) | $ (2,955,635) | $ (1,487,483) | $ (1,913,798) | $ (3,869,995) | $ (506,143) | $ (761,446) | $ (914,361) | $ (981,340) | $ (1,152,352) | $ (2,955,635)
Percentage of ownership interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% | 50.00% |  |  |  | 50.00% | 50.00% | 50.00% |  |  |  | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  | 50.00% | 50.00% | 50.00% |  |  |  | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  | 40.00% | 40.00% | 40.00% | 40.00% |  |  |  | 50.00% | 50.00% | 50.00% | 40.00% | 40.00% | 40.00%

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