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v3.20.1

RELATED PARTY TRANSACTIONS (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 29, 2017 USD ($) | Jul. 16, 2017 USD ($) | Jul. 06, 2017 USD ($)
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Management fee | $ 2,409,151 | $ 2,326,225 | $ 2,159,458 |  |  |  |
Repairs and maintenance | 9,191,561 | 9,187,714 | 8,378,639 |  |  |  |
Administrative expense | 2,495,272 | 2,204,923 | 2,008,107 |  |  |  |
Employer contributions in 401K plan | $ 45,000 |  |  |  |  |  |
Number of advisory committee meetings | item | 4 |  |  |  |  |  |
Expenses incurred for advisory committee meeting | $ 20,500 |  |  |  |  |  |
Number of audit committee meetings held | item | 4 |  |  |  |  |  |
Expenses incurred for audit committee meeting | $ 24,000 |  |  |  |  |  |
Interest expense | $ 12,201,966 | 12,389,680 | 11,114,146 |  |  |  |
Majority of Partnership Properties, Excluding Linewt |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Management fee as percentage of gross receipts rental revenue | 4.00% |  |  |  |  |  |
Hamilton Linewt LLC Commercial-1031 Exchange Newton, Massachusetts |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Management fee as percentage of gross receipts rental revenue | 3.00% |  |  |  |  |  |
Woodland Park Apartments LLC Newton Massachusetts |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Loan amount |  |  |  |  | $ 22,250,000 | $ 16,000,000 | $ 16,000,000
Interest rate (as a percent) |  |  |  |  | 3.79% | 4.75% |
Interest expense | $ 182,000 |  |  |  |  |  |
Investment Properties |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Number of limited partnerships and limited liability companies in which the entity has invested | item | 7 |  |  |  |  |  |
Investment Properties | Minimum |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Ownership interest (as a percent) | 40.00% |  |  |  |  |  |
Investment Properties | Maximum |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% |  |  |  |  |  |
Hamilton Company/Management Company |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Employer contributions in 401K plan | $ 45,000 | 0 | 0 |  |  |  |
Number of accounting staff of related party providing bookkeeping and accounting functions | item | 14 |  |  |  |  |  |
Number of employees having ownership interest in the investment properties | item | 5 |  |  |  |  |  |
Hamilton Company/Management Company, Related Party |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Management fee | $ 2,409,000 | 2,326,000 | 2,159,000 |  |  |  |
Related Party Transaction, Services, Excluding Management Fee | 1,702,000 | 1,380,000 | 882,000 |  |  |  |
Repairs and maintenance | 392,000 |  |  |  |  |  |
Administrative expense | 377,000 |  |  |  |  |  |
Rental commissions | 9,000 |  |  |  |  |  |
Construction, architectural services and supervision of capital projects | 924,000 |  |  |  |  |  |
Amount received for rental commissions | 121,000 |  |  |  |  |  |
Reimbursement to related party for payroll transfers | 3,384,000 | 3,347,000 | 3,463,000 |  |  |  |
Fees for accounting and bookkeeping services |  | $ 125,000 | 125,000 | $ 125,000 |  |  |
Investment Properties | Hamilton Company/Management Company |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Property Management Fee Revenue And Other Service Revenue | 986,000 |  |  |  |  |  |
Amount received for management fees | 664,000 |  |  |  |  |  |
Amount received for construction, architectural services and supervision of capital projects | 104,000 |  |  |  |  |  |
Amount received for maintenance services | 60,000 |  |  |  |  |  |
Amount received for administrative services | $ 37,000 |  |  |  |  |  |
Number of employees having ownership interest in the investment properties | item | 5 |  |  |  |  |  |
Investment Properties, Excluding Dexter Park | Hamilton Company/Management Company |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Property management fee received (as a percent) | 4.00% |  |  |  |  |  |
Dexter Park | Hamilton Company/Management Company |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Property management fee received (as a percent) | 2.00% |  |  |  |  |  |
President of Management Company |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Annual fee for asset management consulting services | $ 37,500 |  | $ 75,000 | $ 75,000 |  |  |
Harold Brown | Investment Properties | Minimum |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Ownership interest of related party (as a percent) | 47.60% |  |  |  |  |  |
Harold Brown | Investment Properties | Maximum |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Ownership interest of related party (as a percent) | 59.00% |  |  |  |  |  |
Residential and mixed-use properties | Partially owned properties | Minimum |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Ownership interest (as a percent) | 40.00% |  |  |  |  |  |
Residential and mixed-use properties | Partially owned properties | Investment Properties | Minimum |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Ownership interest (as a percent) | 40.00% |  |  |  |  |  |
Residential and mixed-use properties | Partially owned properties | Investment Properties | Maximum |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% |  |  |  |  |  |

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