XML 57 R45.htm IDEA: XBRL DOCUMENT
v3.8.0.1

RELATED PARTY TRANSACTIONS (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 29, 2017 USD ($) | Jul. 16, 2017 USD ($) | Jul. 06, 2017 USD ($)
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Management fee | $ 2,159,458 | $ 2,029,171 | $ 1,869,977 |  |  |  |
Repairs and maintenance | 8,378,639 | 8,258,263 | 6,998,592 |  |  |  |
Administrative expense | $ 2,008,107 | 2,102,812 | 2,096,290 |  |  |  |
Number of advisory committee meetings | item | 4 |  |  |  |  |  |
Expenses incurred for advisory committee meeting | $ 19,000 |  |  |  |  |  |
Number of audit committee meetings held | item | 4 |  |  |  |  |  |
Expenses incurred for audit committee meeting | $ 12,000 |  |  |  |  |  |
Interest expense | $ 11,114,146 | 10,200,393 | 9,980,359 |  |  |  |
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 | 9 |  |  |  |  |  |
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 |  | 0 | 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 | $ 2,159,000 | 2,029,000 | 1,870,000 |  |  |  |
Related Party Transaction, Services, Excluding Management Fee | 882,000 | 1,069,000 | 994,000 |  |  |  |
Repairs and maintenance | 295,000 |  |  |  |  |  |
Administrative expense | 359,000 |  |  |  |  |  |
Construction, architectural services and supervision of capital projects | 227,000 |  |  |  |  |  |
Commercial brokerage fees | 1,000 |  |  |  |  |  |
Reimbursement to related party for payroll transfers | 3,463,000 | 3,076,000 | 2,958,000 |  |  |  |
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 | 1,377,000 |  |  |  |  |  |
Amount received for management fees | 673,000 |  |  |  |  |  |
Amount received for construction, architectural services and supervision of capital projects | 620,000 |  |  |  |  |  |
Amount received for maintenance | 44,000 |  |  |  |  |  |
Amount received for administrative services | $ 40,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |
Quarterly fee for asset management consulting services |  | 18,750 | 18,750 | 18,750 |  |  |
Fee for asset management consulting services |  | $ 75,000 | $ 75,000 | $ 75,000 |  |  |
Harold Brown | Investment Properties | Minimum |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Ownership interest of related party (as a percent) | 43.20% |  |  |  |  |  |
Harold Brown | Investment Properties | Maximum |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |  |
Ownership interest of related party (as a percent) | 56.00% |  |  |  |  |  |
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% |  |  |  |  |  |

X
- Definition Represents the amount of quarterly fee for asset management consulting services. + References No definition available. + Details
Name: | nen_AssetManagementQuarterlyFees
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Revenue derived from construction, architectural services and supervision of capital projects provided under contracts or arrangements with clients. + References No definition available. + Details
Name: | nen_ConstructionArchitecturalServicesAndSupervisionOfCapitalProjects
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount aggregate cost of construction, architectural services and supervision of capital projects during the reporting period. + References No definition available. + Details
Name: | nen_CostOfServicesArchitecturalServicesAndSupervisionOfProjects
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the expenses incurred for attendance and participation in advisory committee meeting. + References No definition available. + Details
Name: | nen_ExpensesIncurredForAttendanceAndParticipationInAdvisoryCommitteeMeeting
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the expenses incurred for attendance and participation in Advisory Committee meeting. + References No definition available. + Details
Name: | nen_ExpensesIncurredForAttendanceAndParticipationInAuditCommitteeMeeting
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of limited partnerships and limited liability companies in which the entity has made investments which are accounted for using the equity method of consolidation. + References No definition available. + Details
Name: | nen_InvestmentsInNumberOfLimitedPartnershipsAndLimitedLiabilityCompanies
Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the amount of management fee incurred for payment to a management company during the reporting period. + References No definition available. + Details
Name: | nen_ManagementFees
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of Advisory Committee meeting held during the reporting period. + References No definition available. + Details
Name: | nen_NumberOfAdvisoryCommitteeMeetingHeld
Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of Audit Committee meeting held during the period. + References No definition available. + Details
Name: | nen_NumberOfAuditCommitteeMeetingHeld
Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of employees, excluding President, having ownership interest in the investment properties. + References No definition available. + Details
Name: | nen_NumberOfEmployeesHavingOwnershipInterest
Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of revenue derived from managing real estate properties and from providing other services which may include construction, architectural services, supervision of capital projects, repairs and maintenance, and administrative services. + References No definition available. + Details
Name: | nen_PropertyManagementFeeRevenueAndOtherServiceRevenue
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee by related party. + References No definition available. + Details
Name: | nen_RelatedPartyOwnershipInterest
Namespace Prefix: | nen_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the amount of expense charged to entity for bookkeeping and accounting services under terms of agreement with related parties, included within administrative costs. + References No definition available. + Details
Name: | nen_RelatedPartyTransactionBookkeepingAndAccountingServicesFee
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the management fee expressed as a percentage of rental revenues from properties owned. + References No definition available. + Details
Name: | nen_RelatedPartyTransactionManagementFeeAsPercentageOfPropertyRentalRevenueAndLaundryIncome
Namespace Prefix: | nen_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of employees who perform accounting and bookkeeping functions. + References No definition available. + Details
Name: | nen_RelatedPartyTransactionNumberOfAccountingStaff
Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount reimbursed to related party for transfer of employee payroll. + References No definition available. + Details
Name: | nen_RelatedPartyTransactionReimbursementToRelatedPartyForEmployeePayroll
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amounts charged by related party for services provided during the financial reporting period, excluding management fee. Services may include legal, accounting, administrative, repairs and maintenance, construction, rental and architectural services and supervision of capital projects. + References No definition available. + Details
Name: | nen_RelatedPartyTransactionServicesVariousProfessionalServicesExcludingManagementFee
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of revenue from providing administrative services, including, but not limited to, accounting, tax, legal, regulatory filing, and share registration activities of managed funds and investment accounts of independent third parties and related and affiliated entities. + References No definition available. + Details
Name: | us-gaap_AdministrativeServicesRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate costs related to asset management during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_AssetManagementCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_CostOfPropertyRepairsAndMaintenance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_GeneralAndAdministrativeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_InterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Revenue derived from maintenance services provided under contracts or arrangements with clients. For example, it may include the maintenance of software, plant and equipment, and facilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_MaintenanceRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of cash paid for brokerage fees during the current period. This element is intended to represent the brokerage fees paid by and between financial industry participants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
Name: | us-gaap_PaymentsForBrokerageFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage charged for managing real estate properties. + References No definition available. + Details
Name: | us-gaap_PropertyManagementFeePercentFee
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of revenue derived from managing real estate properties. + References No definition available. + Details
Name: | us-gaap_PropertyManagementFeeRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=nen_MajorityOfPartnershipPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=nen_HamiltonLinewtLLCCommercial1031ExchangeNewtonMassachusettsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=nen_WoodlandParkApartmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=nen_InvestmentPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=nen_HamiltonCompanyIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=nen_HamiltonCompanyIncRelatedPartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=nen_InvestmentPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=nen_InvestmentPropertiesExcludingDexterParkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=nen_HamiltonParkTowersLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=nen_PresidentOfManagementCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=nen_HaroldBrownMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=nen_ResidentialAndMixedUseRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_PartiallyOwnedPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |