636 East 231st St
Multifamily Housing in New York City, NY · 10466
At a glance
636 East 231st St is a 32,710-square-foot multifamily housing building in New York City, New York, built in 1929. 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 118.6 kBtu/ft² and 302 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 | 118.6 kBtu/ft² |
| Source EUI | 139.2 kBtu/ft² |
| GHG emissions | 302 tCO₂e |
| GHG intensity | 9.2 kgCO₂e/ft² |
| Electricity | 102,756 kWh |
| Natural gas | 1,710 therms |
| Water use | 7,881 kgal |
| Gross floor area | 32,710 sq ft |
| Source record | nyc:6246494:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 9 | -4 | 118.6 kBtu/ft² | 302 tCO₂e |
| 2023 | 13 | -11 | 110.9 kBtu/ft² | 282 tCO₂e |
| 2022 | 24 | 107.5 kBtu/ft² | 265 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
- 636 East 231st St
- City
- New York City
- State
- New York
- ZIP
- 10466
- Coordinates
- 40.89267, -73.86012
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 636 East 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. 636 East 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 118.6 kBtu/ft² is about 58% above 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 9.2 kgCO₂e/ft² is about 78% above the group average of 5.2 kgCO₂e/ft².
At 32,710 sq ft, it is about 68% below the average floor area of 100,951 sq ft for those buildings. It was built in 1929, 23 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 636 East 231st St's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 636 East 231st St, covering report years 2022–2024. Its ENERGY STAR score went from 24 in 2022 to 9 in 2024 (-15 points); its best year on file was 2022, at 24. Site EUI moved from 107.5 kBtu/ft² (2022) to 118.6 kBtu/ft² (2024), an 10% increase. Reported emissions went from 265 tCO₂e to 302 tCO₂e over the same span (up 14%).
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. 636 East 231st St's 118.6 kBtu/ft² across 32,710 sq ft works out to about 3.9 billion Btu (1,137 MWh-equivalent) in 2024. Its source EUI of 139.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 102,756 kWh of electricity, 1,710 therms of natural gas and 7,881 thousand gallons of water for the year.
Which law requires 636 East 231st St to report its energy use?
636 East 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:6246494:2024). 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
- MARINER'S HARBOR - Bldg 14· 32,705 sq ft · EUI 209.0 kBtu/ft²
- 51 Stratford Road· 32,704 sq ft · score 91 (A)
- Claremont rehab (Group 5) - Bldg 3· 32,700 sq ft · EUI 106.1 kBtu/ft²
- 83 NORTHERN· 32,700 sq ft · score 1 (D)
- Hamilton Heights - 115 Hamilton Pl (just data)· 32,700 sq ft
- Living - 165 Eldridge Street· 32,700 sq ft · EUI 63.7 kBtu/ft²
- 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 636 East 231st St's energy grade?
636 East 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 636 East 231st St use?
Its 2024 site energy-use intensity was 118.6 kBtu/ft² (139.2 kBtu/ft² source) across 32,710 sq ft, including 102,756 kWh of electricity and 1,710 therms of natural gas.
What are 636 East 231st St's carbon emissions?
636 East 231st St reported 302 tCO₂e of greenhouse-gas emissions (9.2 kgCO₂e/ft²) for 2024.
Where is 636 East 231st St?
636 East 231st St is in New York City, New York 10466. Its coordinates are 40.89267, -73.86012 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 636 East 231st St and when was it built?
636 East 231st St has 32,710 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1929 as its year built. It is classed as multifamily housing.
Is 636 East 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, “636 East 231st St, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/636-east-231st-st-595c1d1c (data as of October 2, 2026).