100 William
Office in New York City, NY · 100 William Street · 10038
At a glance
100 William is a 377,120-square-foot office building at 100 William Street in New York City, New York, built in 1972. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 70 out of 100 (grade B), a site energy-use intensity of 79.7 kBtu/ft² and 2,596 tCO₂e of greenhouse-gas emissions. That score is higher than 35% of the 2,519 scored office buildings in New York City.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 70 (band B) |
| Site EUI | 79.7 kBtu/ft² |
| Source EUI | 148.1 kBtu/ft² |
| GHG emissions | 2,596 tCO₂e |
| GHG intensity | 6.9 kgCO₂e/ft² |
| Electricity | 3,611,827 kWh |
| Gross floor area | 377,120 sq ft |
| Source record | nyc:53556395:2024 |
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
- 100 William Street
- City
- New York City
- State
- New York
- ZIP
- 10038
- Coordinates
- 40.70850, -74.00748
Within ~1 km
Nearby benchmarked buildings
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- 28 Libertyscore 59
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- 200 West Streetscore 83
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- 120 Broadway Holdings, LLCscore 78
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See also: most efficient in New York City · biggest emitters
How does 100 William compare with other office buildings in New York City?
The latest disclosures cover 3,384 office buildings in New York City, out of 48,310 buildings citywide. 100 William's ENERGY STAR score of 70 compares with an average of 72 across the 2,519 that report a score; it scores higher than 35% of them and lower than 64%. Its site EUI of 79.7 kBtu/ft² is about 24% above the average of 64.5 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 6.9 kgCO₂e/ft² is about 19% above the group average of 5.8 kgCO₂e/ft².
At 377,120 sq ft, it is about 84% above the average floor area of 205,440 sq ft for those buildings. It was built in 1972, 32 years later than the group's average year built (1940). Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
What does an ENERGY STAR score of 70 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 70 means the building performs better than about 70% of its national peers. BuildingCensus bands the score into report-card grades; 70 falls in band B — above median (70–84). It sits 5 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. 100 William's 79.7 kBtu/ft² across 377,120 sq ft works out to about 30.1 billion Btu (8,809 MWh-equivalent) in 2024. Its source EUI of 148.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 3,611,827 kWh of electricity for the year.
Which law requires 100 William to report its energy use?
100 William 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:53556395:2024). 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 office buildings in New York City
- 9-23 Bond Street, 263 Livingston Street and 508 Fulton Street (Parent Property)· 375,764 sq ft · EUI 55.7 kBtu/ft²
- 40 East 52nd Street LP· 375,225 sq ft · EUI 12.5 kBtu/ft²
- 10 East 53rd Street· 374,197 sq ft · score 36 (D)
- 580 Fifth Avenue· 373,005 sq ft · score 65 (C)
- URA Group - 568 Broadway· 372,895 sq ft · score 61 (C)
- 1201 Lafayette Avenue and 938 Garrison Avenue (Parent Property)· 372,352 sq ft · EUI 52.5 kBtu/ft²
- Office buildings in New York City· 3,384 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 100 William's energy grade?
100 William scores 70 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2024 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 100 William use?
Its 2024 site energy-use intensity was 79.7 kBtu/ft² (148.1 kBtu/ft² source) across 377,120 sq ft, including 3,611,827 kWh of electricity.
What are 100 William's carbon emissions?
100 William reported 2,596 tCO₂e of greenhouse-gas emissions (6.9 kgCO₂e/ft²) for 2024.
Where is 100 William?
100 William is at 100 William Street, in New York City, New York 10038. Its coordinates are 40.70850, -74.00748 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 100 William and when was it built?
100 William has 377,120 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1972 as its year built. It is classed as office.
Is 100 William 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, “100 William, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/100-william-2bd525a2 (data as of October 2, 2026).