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MORTGAGE NOTES PAYABLE (Line of Credit) (Details) |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 20, 2019 USD ($) | Sep. 29, 2017 USD ($) | Jul. 31, 2014 USD ($) | Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Feb. 07, 2020 USD ($) | Dec. 19, 2019 USD ($) | May 31, 2019 USD ($) | Mar. 29, 2018 USD ($) | Jul. 16, 2017 USD ($) | Jul. 06, 2017 USD ($)
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  | $ 12,201,966 | $ 12,389,680 | $ 11,114,146 |  |  |  |  |  |
Credit line balance |  |  |  |  | $ 18,000,000 |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Loan amount |  |  |  |  |  |  | $ 6,175,000 |  |  |  |  |
Residences at Captain Parkers LLC Residential Apartments Lexington, Massachusetts |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Loan amount |  |  |  |  |  |  |  |  | $ 20,750,000 |  |  |
Woodland Park Apartments LLC Newton Massachusetts |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Term of debt |  | 30 years |  |  |  |  |  |  |  |  |  |
Loan amount |  | $ 22,250,000 |  |  |  |  |  |  |  |  | $ 16,000,000 | $ 16,000,000
Interest expense |  |  |  | 182,000 |  |  |  |  |  |  |  |
Credit line balance |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000
Hamilton Highlands LLC Residential Needham Massachusetts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Loan amount |  |  |  |  |  |  |  |  |  | $ 21,500,000 |  |
Credit line balance |  |  |  |  |  |  |  |  |  | $ 8,000,000 |  |
Residences at Captain Parkers LLC Residential Apartments Lexington, Massachusetts |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Loan amount |  |  |  |  |  |  |  |  | $ 20,750,000 |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Term of debt |  |  | 3 years |  |  |  |  |  |  |  |  |
Loan amount |  |  | $ 25,000,000 |  |  |  |  | $ 20,000,000 |  |  |  |
Payment on line of credit | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |
Margin over basis of interest rate (as a percent) |  |  | 2.50% |  |  |  |  |  |  |  |  |
Amount of refinancing costs |  |  | $ 128,000 |  |  |  |  |  |  |  |  |
Credit line balance |  |  |  | $ 18,000,000 |  |  |  |  |  |  |  |
Number of properties in which borrowing amount collateralized | item |  |  |  | 23 |  |  |  |  |  |  |  |
Commitment fee |  |  |  | $ 48,000 |  |  |  |  |  |  |  |
Line of Credit | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Basis of effective interest rate used in calculation of Base Rate (as a percent) |  |  | 1.00% |  |  |  |  |  |  |  |  |
Line of Credit | Federal Funds Rate |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Basis of effective interest rate used in calculation of Base Rate (as a percent) |  |  | 0.50% |  |  |  |  |  |  |  |  |
Line of Credit | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Pledged interests of the Partnership's ownership interest (as a percent) |  |  |  | 49.00% |  |  |  |  |  |  |  |
Commitment fee for unused amount (as a percent) |  |  |  | 0.15% |  |  |  |  |  |  |  |
Tangible net worth |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |
Ratio of net operating income to total indebtedness |  |  |  | 9.50% |  |  |  |  |  |  |  |
Debt service coverage ratio |  |  |  | 1.6 |  |  |  |  |  |  |  |
Line of Credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Pledged interests of the Partnership's ownership interest (as a percent) |  |  |  | 100.00% |  |  |  |  |  |  |  |
Commitment fee for unused amount (as a percent) |  |  |  | 0.20% |  |  |  |  |  |  |  |
Leverage ratio |  |  |  | 65.00% |  |  |  |  |  |  |  |
Aggregate increase in indebtedness |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  |

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- Definition Represents the ratio of consolidated adjusted earnings before interest, taxes, depreciation and amortization to interest expense, which is necessary to be maintained under the terms of the senior credit facilities' covenants. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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