AKAM - 639 West End Avenue

How does AKAM - 639 West End Avenue 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. AKAM - 639 West End Avenue's ENERGY STAR score of 81 compares with an average of 63 across the 22,829 that report a score; it scores higher than 64% of them and lower than 34%. Its site EUI of 62.1 kBtu/ft² is about 17% below the average of 74.9 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 3.9 kgCO₂e/ft² is about 26% below the group average of 5.2 kgCO₂e/ft².

At 97,600 sq ft, it is roughly in line with the average floor area of 100,951 sq ft for those buildings. It was built in 1927, 25 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 AKAM - 639 West End Avenue's energy performance changed over time?

BuildingCensus holds 3 New York City disclosures for AKAM - 639 West End Avenue, covering report years 2022–2024. Its ENERGY STAR score went from 61 in 2022 to 81 in 2024 (+20 points). Site EUI moved from 69.7 kBtu/ft² (2022) to 62.1 kBtu/ft² (2024), a 11% decrease. Reported emissions went from 381 tCO₂e to 377 tCO₂e over the same span (down 1%).

What does an ENERGY STAR score of 81 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 81 means the building performs better than about 81% of its national peers. BuildingCensus bands the score into report-card grades; 81 falls in band B — above median (70–84). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. 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. AKAM - 639 West End Avenue's 62.1 kBtu/ft² across 97,600 sq ft works out to about 6.1 billion Btu (1,776 MWh-equivalent) in 2024. Its source EUI of 81.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 261,623 kWh of electricity, 51,653 therms of natural gas and 2,236 thousand gallons of water for the year.

Which law requires AKAM - 639 West End Avenue to report its energy use?

AKAM - 639 West End Avenue 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:4952319:2024). 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.