100 William Street NY

How does 100 William Street NY 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 Street NY's ENERGY STAR score of 57 compares with an average of 72 across the 2,519 that report a score; it scores higher than 21% of them and lower than 78%. Its site EUI of 77.4 kBtu/ft² is about 20% 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 6.7 kgCO₂e/ft² is about 16% 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 57 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 57 means the building performs better than about 57% of its national peers. BuildingCensus bands the score into report-card grades; 57 falls in band C — below median (55–69). It sits 18 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 Street NY's 77.4 kBtu/ft² across 377,120 sq ft works out to about 29.2 billion Btu (8,554 MWh-equivalent) in 2024. Its source EUI of 145.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 3,603,821 kWh of electricity and 3,288 thousand gallons of water for the year.

Which law requires 100 William Street NY to report its energy use?

100 William Street NY 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:19081244:2024). 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.