ABC: 234 West 21st St

How does ABC: 234 West 21st St 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. ABC: 234 West 21st St's ENERGY STAR score of 90 compares with an average of 63 across the 22,829 that report a score; it scores higher than 76% of them and lower than 22%. Its site EUI of 54.2 kBtu/ft² is about 28% 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 4.5 kgCO₂e/ft² is about 13% below the group average of 5.2 kgCO₂e/ft².

At 35,008 sq ft, it is about 65% below the average floor area of 100,951 sq ft for those buildings. It was built in 1913, 39 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 ABC: 234 West 21st St's energy performance changed over time?

BuildingCensus holds 3 New York City disclosures for ABC: 234 West 21st St, covering report years 2022–2024. Its ENERGY STAR score went from 81 in 2022 to 90 in 2024 (+9 points); its best year on file was 2023, at 95. Site EUI moved from 66.0 kBtu/ft² (2022) to 54.2 kBtu/ft² (2024), a 18% decrease. Reported emissions went from 175 tCO₂e to 158 tCO₂e over the same span (down 10%).

What does an ENERGY STAR score of 90 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 90 means the building performs better than about 90% of its national peers. BuildingCensus bands the score into report-card grades; 90 falls in band A — high performer (85–100). 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. ABC: 234 West 21st St's 54.2 kBtu/ft² across 35,008 sq ft works out to about 1.9 billion Btu (556 MWh-equivalent) in 2024. Its source EUI of 76.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 126,787 kWh of electricity, 453 therms of natural gas and 942 thousand gallons of water for the year.

Which law requires ABC: 234 West 21st St to report its energy use?

ABC: 234 West 21st St 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:6282393:2024). 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.