Brownstone - 6402 23rd Ave
Multifamily Housing in New York City, NY · 6402 23rd Ave · 11204
At a glance
Brownstone - 6402 23rd Ave is a 25,700-square-foot multifamily housing building in New York City, New York, built in 1928. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 24 out of 100 (grade D), a site energy-use intensity of 102.1 kBtu/ft² and 157 tCO₂e of greenhouse-gas emissions. That score is higher than 14% 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 | 24 (band D) |
| Site EUI | 102.1 kBtu/ft² |
| Source EUI | 126.2 kBtu/ft² |
| GHG emissions | 157 tCO₂e |
| GHG intensity | 6.1 kgCO₂e/ft² |
| Electricity | 81,360 kWh |
| Natural gas | 23,476 therms |
| Water use | 1,654 kgal |
| Gross floor area | 25,700 sq ft |
| Source record | nyc:26017841:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 24 | -3 | 102.1 kBtu/ft² | 157 tCO₂e |
| 2023 | 27 | ±0 | 99.7 kBtu/ft² | 151 tCO₂e |
| 2022 | 27 | 110.6 kBtu/ft² | 160 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
- 6402 23rd Ave
- City
- New York City
- State
- New York
- ZIP
- 11204
- Coordinates
- 40.61301, -73.97868
Within ~1 km
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How does Brownstone - 6402 23rd Ave 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. Brownstone - 6402 23rd Ave's ENERGY STAR score of 24 compares with an average of 63 across the 22,829 that report a score; it scores higher than 14% of them and lower than 85%. Its site EUI of 102.1 kBtu/ft² is about 36% 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 6.1 kgCO₂e/ft² is about 17% above the group average of 5.2 kgCO₂e/ft².
At 25,700 sq ft, it is about 75% below the average floor area of 100,951 sq ft for those buildings. It was built in 1928, 24 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 Brownstone - 6402 23rd Ave's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Brownstone - 6402 23rd Ave, covering report years 2022–2024. Its ENERGY STAR score went from 27 in 2022 to 24 in 2024 (-3 points); its best year on file was 2022, at 27. Site EUI moved from 110.6 kBtu/ft² (2022) to 102.1 kBtu/ft² (2024), a 8% decrease. Reported emissions went from 160 tCO₂e to 157 tCO₂e over the same span (down 2%).
What does an ENERGY STAR score of 24 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 24 means the building performs better than about 24% of its national peers. BuildingCensus bands the score into report-card grades; 24 falls in band D — lowest band (1–54). It sits 51 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. Brownstone - 6402 23rd Ave's 102.1 kBtu/ft² across 25,700 sq ft works out to about 2.6 billion Btu (769 MWh-equivalent) in 2024. Its source EUI of 126.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 81,360 kWh of electricity, 23,476 therms of natural gas and 1,654 thousand gallons of water for the year.
Which law requires Brownstone - 6402 23rd Ave to report its energy use?
Brownstone - 6402 23rd Ave 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:26017841:2024). 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.
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- Multifamily Housing buildings in New York City· 33,022 benchmarked
- All New York City benchmarked buildings· Local Law 84 (LL84)
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Frequently asked questions
What is Brownstone - 6402 23rd Ave's energy grade?
Brownstone - 6402 23rd Ave scores 24 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 Brownstone - 6402 23rd Ave use?
Its 2024 site energy-use intensity was 102.1 kBtu/ft² (126.2 kBtu/ft² source) across 25,700 sq ft, including 81,360 kWh of electricity and 23,476 therms of natural gas.
What are Brownstone - 6402 23rd Ave's carbon emissions?
Brownstone - 6402 23rd Ave reported 157 tCO₂e of greenhouse-gas emissions (6.1 kgCO₂e/ft²) for 2024.
Where is Brownstone - 6402 23rd Ave?
Brownstone - 6402 23rd Ave is in New York City, New York 11204. Its coordinates are 40.61301, -73.97868 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Brownstone - 6402 23rd Ave and when was it built?
Brownstone - 6402 23rd Ave has 25,700 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1928 as its year built. It is classed as multifamily housing.
Is Brownstone - 6402 23rd Ave 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, “Brownstone - 6402 23rd Ave, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/brownstone-6402-23rd-ave-74df2b5d (data as of October 2, 2026).