405 Williams Ave
Multifamily Housing in New York City, NY · 405 WILLIAMS AVE · 11207
At a glance
405 Williams Ave is a 77,922-square-foot multifamily housing building at 405 WILLIAMS AVE in New York City, New York, built in 1972. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 56 out of 100 (grade C), a site energy-use intensity of 78.5 kBtu/ft² and 433 tCO₂e of greenhouse-gas emissions. That score is higher than 37% 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 | 56 (band C) |
| Site EUI | 78.5 kBtu/ft² |
| Source EUI | 121.6 kBtu/ft² |
| GHG emissions | 433 tCO₂e |
| GHG intensity | 5.6 kgCO₂e/ft² |
| Electricity | 511,577 kWh |
| Natural gas | 43,699 therms |
| Gross floor area | 77,922 sq ft |
| Source record | nyc:10387265:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 56 | +36 | 78.5 kBtu/ft² | 433 tCO₂e |
| 2023 | 20 | -10 | 108.6 kBtu/ft² | 546 tCO₂e |
| 2022 | 30 | 105.8 kBtu/ft² | 492 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
- 405 WILLIAMS AVE
- City
- New York City
- State
- New York
- ZIP
- 11207
- Coordinates
- 40.66600, -73.89821
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 405 Williams 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. 405 Williams Ave's ENERGY STAR score of 56 compares with an average of 63 across the 22,829 that report a score; it scores higher than 37% of them and lower than 62%. Its site EUI of 78.5 kBtu/ft² is roughly in line with the average of 74.9 kBtu/ft². Its emissions intensity of 5.6 kgCO₂e/ft² is roughly in line with the group average of 5.2 kgCO₂e/ft².
At 77,922 sq ft, it is about 23% below the average floor area of 100,951 sq ft for those buildings. It was built in 1972, 20 years later 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 405 Williams Ave's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 405 Williams Ave, covering report years 2022–2024. Its ENERGY STAR score went from 30 in 2022 to 56 in 2024 (+26 points). Site EUI moved from 105.8 kBtu/ft² (2022) to 78.5 kBtu/ft² (2024), a 26% decrease. Reported emissions went from 492 tCO₂e to 433 tCO₂e over the same span (down 12%).
What does an ENERGY STAR score of 56 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 56 means the building performs better than about 56% of its national peers. BuildingCensus bands the score into report-card grades; 56 falls in band C — below median (55–69). It sits 19 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. 405 Williams Ave's 78.5 kBtu/ft² across 77,922 sq ft works out to about 6.1 billion Btu (1,793 MWh-equivalent) in 2024. Its source EUI of 121.6 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 511,577 kWh of electricity and 43,699 therms of natural gas for the year.
Which law requires 405 Williams Ave to report its energy use?
405 Williams 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:10387265:2024). 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
- Reiger: 1320 51st St· 77,913 sq ft · score 60 (C)
- Abro - 89-16 175th Street - Parent· 77,885 sq ft · score 80 (B)
- 137-40 45th Avenue· 77,880 sq ft · score 90 (A)
- 4131 BROADWAY· 77,877 sq ft · score 38 (D)
- AKAM - 375 West End Avenue· 77,870 sq ft · score 67 (C)
- 4640-46 Broadway· 77,865 sq ft · score 3 (D)
- 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 405 Williams Ave's energy grade?
405 Williams Ave scores 56 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2024 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 405 Williams Ave use?
Its 2024 site energy-use intensity was 78.5 kBtu/ft² (121.6 kBtu/ft² source) across 77,922 sq ft, including 511,577 kWh of electricity and 43,699 therms of natural gas.
What are 405 Williams Ave's carbon emissions?
405 Williams Ave reported 433 tCO₂e of greenhouse-gas emissions (5.6 kgCO₂e/ft²) for 2024.
Where is 405 Williams Ave?
405 Williams Ave is at 405 WILLIAMS AVE, in New York City, New York 11207. Its coordinates are 40.66600, -73.89821 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 405 Williams Ave and when was it built?
405 Williams Ave has 77,922 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1972 as its year built. It is classed as multifamily housing.
Is 405 Williams 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, “405 Williams Ave, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/405-williams-ave-adc648de (data as of October 2, 2026).