XML 59 R47.htm IDEA: XBRL DOCUMENT
v3.25.0.1

RENTAL PROPERTIES (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) property item | Dec. 31, 2023 USD ($) property | Dec. 31, 2022 property
Rental properties |  |  |
Total fixed assets | $ 461,409,491 | $ 440,496,897 |
Less: Accumulated depreciation | (182,892,842) | (170,691,951) |
Total fixed assets, net | 278,516,649 | 269,804,946 |
Land, improvements and parking lots |  |  |
Rental properties |  |  |
Total fixed assets | $ 101,397,349 | 99,162,143 |
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 | $ 279,272,215 | 276,167,618 |
Buildings and improvements | Minimum |  |  |
Rental properties |  |  |
Useful Life | 15 years |  |
Buildings and improvements | Maximum |  |  |
Rental properties |  |  |
Useful Life | 40 years |  |
Construction in Progress |  |  |
Rental properties |  |  |
Total fixed assets | $ 16,758,245 | 1,818,716 |
Kitchen cabinets |  |  |
Rental properties |  |  |
Total fixed assets | $ 14,187,702 | 16,137,828 |
Kitchen cabinets | Minimum |  |  |
Rental properties |  |  |
Useful Life | 5 years |  |
Kitchen cabinets | Maximum |  |  |
Rental properties |  |  |
Useful Life | 10 years |  |
Carpets |  |  |
Rental properties |  |  |
Total fixed assets | $ 14,545,300 | 13,127,838 |
Carpets | Minimum |  |  |
Rental properties |  |  |
Useful Life | 5 years |  |
Carpets | Maximum |  |  |
Rental properties |  |  |
Useful Life | 10 years |  |
Air conditioning |  |  |
Rental properties |  |  |
Total fixed assets | $ 500,000 | 500,000 |
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 | $ 475,931 | 568,716 |
Laundry equipment | Minimum |  |  |
Rental properties |  |  |
Useful Life | 5 years |  |
Laundry equipment | Maximum |  |  |
Rental properties |  |  |
Useful Life | 7 years |  |
Elevators |  |  |
Rental properties |  |  |
Total fixed assets | $ 1,885,265 | 1,885,265 |
Elevators | Minimum |  |  |
Rental properties |  |  |
Useful Life | 20 years |  |
Elevators | Maximum |  |  |
Rental properties |  |  |
Useful Life | 40 years |  |
Swimming pools |  |  |
Rental properties |  |  |
Total fixed assets | $ 1,090,604 | 1,090,604 |
Swimming pools | Minimum |  |  |
Rental properties |  |  |
Useful Life | 10 years |  |
Swimming pools | Maximum |  |  |
Rental properties |  |  |
Useful Life | 30 years |  |
Equipment |  |  |
Rental properties |  |  |
Total fixed assets | $ 21,911,223 | 21,348,556 |
Equipment | Minimum |  |  |
Rental properties |  |  |
Useful Life | 5 years |  |
Equipment | Maximum |  |  |
Rental properties |  |  |
Useful Life | 30 years |  |
Motor vehicles |  |  |
Rental properties |  |  |
Total fixed assets | $ 236,697 | 232,954 |
Useful Life | 5 years |  |
Fences |  |  |
Rental properties |  |  |
Total fixed assets | $ 101,506 | 91,620 |
Fences | Minimum |  |  |
Rental properties |  |  |
Useful Life | 5 years |  |
Fences | Maximum |  |  |
Rental properties |  |  |
Useful Life | 15 years |  |
Furniture and fixtures |  |  |
Rental properties |  |  |
Total fixed assets | $ 9,047,454 | $ 8,365,039 |
Furniture and fixtures | Minimum |  |  |
Rental properties |  |  |
Useful Life | 5 years |  |
Furniture and fixtures | Maximum |  |  |
Rental properties |  |  |
Useful Life | 7 years |  |
Partnership properties |  |  |
RENTAL PROPERTIES |  |  |
Number of properties | property | 31 |  |
Investment Properties |  |  |
RENTAL PROPERTIES |  |  |
Number of units | property | 690 | 690 | 690
NERA 40% |  |  |
RENTAL PROPERTIES |  |  |
Ownership interest (as a percent) | 40.00% | 40.00% | 40.00%
NERA 50% |  |  |
RENTAL PROPERTIES |  |  |
Ownership interest (as a percent) | 50.00% | 50.00% | 50.00%
Residential and mixed-use properties | Partnership properties |  |  |
RENTAL PROPERTIES |  |  |
Number of units | item | 2,943 |  |
Number of properties | property | 27 |  |
Residential and mixed-use properties | Investment properties |  |  |
RENTAL PROPERTIES |  |  |
Number of units | item | 688 |  |
Residential and mixed-use properties | Investment Properties | Investment properties |  |  |
RENTAL PROPERTIES |  |  |
Number of properties | item | 7 |  |
Residential and mixed-use properties | NERA 40% | Investment properties | Minimum |  |  |
RENTAL PROPERTIES |  |  |
Ownership interest (as a percent) | 40.00% |  |
Residential and mixed-use properties | NERA 50% | Investment properties | Maximum |  |  |
RENTAL PROPERTIES |  |  |
Ownership interest (as a percent) | 50.00% |  |
Condominium | Partnership properties |  |  |
RENTAL PROPERTIES |  |  |
Number of units | item | 19 |  |
Number of properties | property | 1 |  |
Commercial |  |  |
RENTAL PROPERTIES |  |  |
Number of properties | property | 2 |  |
Commercial | Partnership properties |  |  |
RENTAL PROPERTIES |  |  |
Number of properties | property | 4 |  |
Commercial | Investment Properties |  |  |
RENTAL PROPERTIES |  |  |
Number of units | property | 3 | 3 | 3

X
- Definition Represents the useful life of constituents of rental properties. + References No definition available. + Details
Name: | nen_RealEstateInvestmentPropertyUsefulLife
Namespace Prefix: | nen_
Data Type: | xbrli:durationItemType
Balance Type: | na
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/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cumulative amount of depreciation for real estate property held for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_RealEstateInvestmentPropertyAtCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_RealEstateInvestmentPropertyNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_RealEstateInvestmentPropertyNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=nen_LandAndLandImprovementsAndParkingLotMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ConstructionInProgressMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=nen_KitchenCabinetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=nen_CarpetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=nen_AirConditioningMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=nen_LaundryEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=nen_ElevatorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=nen_SwimmingPoolMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=nen_FenceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=nen_NewEnglandRealtyAssociatesLimitedPartnership40PercentOwnershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=nen_NewEnglandRealtyAssociatesLimitedPartnership50PercentOwnershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_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: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=nen_CondominiumRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |