646 E 231st St
Multifamily Housing in New York City, NY · 10466
At a glance
646 E 231st St is a 53,860-square-foot multifamily housing building in New York City, New York, built in 1922. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 9 out of 100 (grade D), a site energy-use intensity of 142.6 kBtu/ft² and 597 tCO₂e of greenhouse-gas emissions. That score is higher than 7% of the 22,829 scored multifamily housing buildings in New York City.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 9 (band D) |
| Site EUI | 142.6 kBtu/ft² |
| Source EUI | 164.7 kBtu/ft² |
| GHG emissions | 597 tCO₂e |
| GHG intensity | 11.1 kgCO₂e/ft² |
| Electricity | 180,989 kWh |
| Natural gas | 2,752 therms |
| Water use | 6,576 kgal |
| Gross floor area | 53,860 sq ft |
| Source record | nyc:4869616:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 9 | -4 | 142.6 kBtu/ft² | 597 tCO₂e |
| 2023 | 13 | +3 | 135.6 kBtu/ft² | 563 tCO₂e |
| 2022 | 10 | 149.3 kBtu/ft² | 605 tCO₂e |
Compliance context
Local Law 84 (LL84)
Under Local Law 97, buildings over 25,000 sq ft face carbon caps with fines of $268 per metric ton of CO₂e over the limit, phasing in from 2024.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 646 E 231st St
- City
- New York City
- State
- New York
- ZIP
- 10466
- Coordinates
- 40.89259, -73.85987
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 646 E 231st St compare with other multifamily housing buildings in New York City?
The latest disclosures cover 33,022 multifamily housing buildings in New York City, out of 48,310 buildings citywide. 646 E 231st St's ENERGY STAR score of 9 compares with an average of 63 across the 22,829 that report a score; it scores higher than 7% of them and lower than 93%. Its site EUI of 142.6 kBtu/ft² is about twice the average of 74.9 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 11.1 kgCO₂e/ft² is about twice the group average of 5.2 kgCO₂e/ft².
At 53,860 sq ft, it is about half of the average floor area of 100,951 sq ft for those buildings. It was built in 1922, 30 years earlier than the group's average year built (1952). Across all 24 jurisdictions BuildingCensus covers, the 59,945 multifamily housing buildings average an ENERGY STAR score of 70 and a site EUI of 59.0 kBtu/ft².
How has 646 E 231st St's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 646 E 231st St, covering report years 2022–2024. Its ENERGY STAR score went from 10 in 2022 to 9 in 2024 (-1 points); its best year on file was 2023, at 13. Site EUI moved from 149.3 kBtu/ft² (2022) to 142.6 kBtu/ft² (2024), a 4% decrease. Reported emissions went from 605 tCO₂e to 597 tCO₂e over the same span (down 1%).
What does an ENERGY STAR score of 9 mean?
ENERGY STAR scores run from 1 to 100 and are computed by the EPA's Portfolio Manager as a percentile against similar buildings nationwide, adjusted for climate, size and use: a score of 9 means the building performs better than about 9% of its national peers. BuildingCensus bands the score into report-card grades; 9 falls in band D — lowest band (1–54). It sits 66 points below 75, the threshold for ENERGY STAR certification. In New York City, 43% of scored buildings are at 75 or above.
Site energy-use intensity (EUI) is the energy a building uses on site in a year divided by its floor area, in thousand Btu per square foot — lower is more efficient. 646 E 231st St's 142.6 kBtu/ft² across 53,860 sq ft works out to about 7.7 billion Btu (2,251 MWh-equivalent) in 2024. Its source EUI of 164.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 180,989 kWh of electricity, 2,752 therms of natural gas and 6,576 thousand gallons of water for the year.
Which law requires 646 E 231st St to report its energy use?
646 E 231st St reports under Local Law 84 (LL84), the legal basis of New York City's Energy and Water Data Disclosure program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record nyc:4869616:2024). Under Local Law 97, buildings over 25,000 sq ft face carbon caps with fines of $268 per metric ton of CO₂e over the limit, phasing in from 2024.
More multifamily housing buildings in New York City
- 40 West 22nd Street· 53,857 sq ft · EUI 61.0 kBtu/ft²
- Chestnut - 255 East 176th Street· 53,856 sq ft · score 58 (C)
- 731 West 183rd St· 53,855 sq ft · score 16 (D)
- Gates Gardens HDFC· 53,853 sq ft · score 84 (B)
- Briarwood Owners Corp. 2 - 139-09 84 Drive· 53,850 sq ft · score 79 (B)
- Briarwood Owners Corp. 2 - 140-35 Burden Crescent· 53,848 sq ft · score 100 (A)
- Multifamily Housing buildings in New York City· 33,022 benchmarked
- All New York City benchmarked buildings· Local Law 84 (LL84)
- Most efficient large buildings in New York City
- Least efficient large buildings in New York City
- Biggest emitters in New York City
Frequently asked questions
What is 646 E 231st St's energy grade?
646 E 231st St scores 9 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2024 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 646 E 231st St use?
Its 2024 site energy-use intensity was 142.6 kBtu/ft² (164.7 kBtu/ft² source) across 53,860 sq ft, including 180,989 kWh of electricity and 2,752 therms of natural gas.
What are 646 E 231st St's carbon emissions?
646 E 231st St reported 597 tCO₂e of greenhouse-gas emissions (11.1 kgCO₂e/ft²) for 2024.
Where is 646 E 231st St?
646 E 231st St is in New York City, New York 10466. Its coordinates are 40.89259, -73.85987 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 646 E 231st St and when was it built?
646 E 231st St has 53,860 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1922 as its year built. It is classed as multifamily housing.
Is 646 E 231st St covered by Local Law 84 (LL84)?
Yes — it appears in the 2024 Energy and Water Data Disclosure disclosure, which lists the buildings reporting under Local Law 84 (LL84).
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About this data
Source: Energy and Water Data Disclosure (Local Law 84 (LL84)), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “646 E 231st St, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/646-e-231st-st-a54da3ad (data as of October 2, 2026).