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RENTAL PROPERTIES (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
property
item
Dec. 31, 2015
USD ($)
item
Sep. 18, 2015
item
Dec. 31, 2014
item
RENTAL PROPERTIES        
Number of units | item       1,033
Rental properties        
Total fixed assets $ 263,659,293 $ 261,276,898    
Less: Accumulated depreciation (94,196,482) (84,579,584)    
Total fixed assets, net 169,462,811 176,697,314    
Land, improvements and parking lots        
Rental properties        
Total fixed assets $ 52,612,929 52,852,877    
Land, improvements and parking lots | Minimum        
Rental properties        
Useful Life 15 years      
Land, improvements and parking lots | Maximum        
Rental properties        
Useful Life 40 years      
Buildings and improvements        
Rental properties        
Total fixed assets $ 173,536,288 172,277,299    
Buildings and improvements | Minimum        
Rental properties        
Useful Life 15 years      
Buildings and improvements | Maximum        
Rental properties        
Useful Life 40 years      
Kitchen cabinets        
Rental properties        
Total fixed assets $ 8,738,323 8,493,696    
Kitchen cabinets | Minimum        
Rental properties        
Useful Life 5 years      
Kitchen cabinets | Maximum        
Rental properties        
Useful Life 10 years      
Carpets        
Rental properties        
Total fixed assets $ 7,621,292 7,361,966    
Carpets | Minimum        
Rental properties        
Useful Life 5 years      
Carpets | Maximum        
Rental properties        
Useful Life 10 years      
Air conditioning        
Rental properties        
Total fixed assets $ 690,535 718,531    
Air conditioning | Minimum        
Rental properties        
Useful Life 5 years      
Air conditioning | Maximum        
Rental properties        
Useful Life 10 years      
Laundry equipment        
Rental properties        
Total fixed assets $ 269,784 244,771    
Laundry equipment | Minimum        
Rental properties        
Useful Life 5 years      
Laundry equipment | Maximum        
Rental properties        
Useful Life 7 years      
Elevators        
Rental properties        
Total fixed assets $ 1,139,296 1,139,296    
Elevators | Minimum        
Rental properties        
Useful Life 20 years      
Elevators | Maximum        
Rental properties        
Useful Life 40 years      
Swimming pools        
Rental properties        
Total fixed assets $ 444,629 444,629    
Swimming pools | Minimum        
Rental properties        
Useful Life 10 years      
Swimming pools | Maximum        
Rental properties        
Useful Life 30 years      
Equipment        
Rental properties        
Total fixed assets $ 10,029,639 9,502,977    
Equipment | Minimum        
Rental properties        
Useful Life 5 years      
Equipment | Maximum        
Rental properties        
Useful Life 30 years      
Motor vehicles        
Rental properties        
Total fixed assets $ 237,954 130,563    
Useful Life 5 years      
Fences        
Rental properties        
Total fixed assets $ 37,465 38,115    
Fences | Minimum        
Rental properties        
Useful Life 5 years      
Fences | Maximum        
Rental properties        
Useful Life 15 years      
Furniture and fixtures        
Rental properties        
Total fixed assets $ 8,127,100 7,855,351    
Furniture and fixtures | Minimum        
Rental properties        
Useful Life 5 years      
Furniture and fixtures | Maximum        
Rental properties        
Useful Life 7 years      
Smoke alarms        
Rental properties        
Total fixed assets $ 174,059 $ 216,827    
Smoke alarms | Minimum        
Rental properties        
Useful Life 5 years      
Smoke alarms | Maximum        
Rental properties        
Useful Life 7 years      
Residences at Captain Parkers LLC Residential Apartments Lexington, Massachusetts        
RENTAL PROPERTIES        
Number of units | item     94  
Wholly owned properties        
RENTAL PROPERTIES        
Number of properties | property 25      
Investment Properties        
RENTAL PROPERTIES        
Number of units | item 1,033 1,033    
Investment Properties | Minimum        
RENTAL PROPERTIES        
Ownership interest (as a percent) 40.00%      
Investment Properties | Maximum        
RENTAL PROPERTIES        
Ownership interest (as a percent) 50.00%      
Residential and mixed-use properties | Wholly owned properties        
RENTAL PROPERTIES        
Number of units | item 2,506      
Number of properties | property 21      
Residential and mixed-use properties | Partially owned properties        
RENTAL PROPERTIES        
Number of units | item 774      
Number of properties | item 9      
Residential and mixed-use properties | Investment Properties | Partially owned properties        
RENTAL PROPERTIES        
Number of properties | item 9      
Residential and mixed-use properties | Investment Properties | Partially owned properties | Minimum        
RENTAL PROPERTIES        
Ownership interest (as a percent) 40.00%      
Residential and mixed-use properties | Investment Properties | Partially owned properties | Maximum        
RENTAL PROPERTIES        
Ownership interest (as a percent) 50.00%      
Condominium | Wholly owned properties        
RENTAL PROPERTIES        
Number of units | item 19      
Number of properties | property 1