600 - 435 West 23rd Street

How does 600 - 435 West 23rd Street 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. 600 - 435 West 23rd Street's ENERGY STAR score of 82 compares with an average of 63 across the 22,829 that report a score; it scores higher than 66% of them and lower than 33%. Its site EUI of 74.9 kBtu/ft² is roughly in line with the average of 74.9 kBtu/ft². Its emissions intensity of 4.3 kgCO₂e/ft² is about 17% below the group average of 5.2 kgCO₂e/ft².

At 975,170 sq ft, it is about 866% above the average floor area of 100,951 sq ft for those buildings. It was built in 1934, 18 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.

What does an ENERGY STAR score of 82 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 82 means the building performs better than about 82% of its national peers. BuildingCensus bands the score into report-card grades; 82 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. 600 - 435 West 23rd Street's 74.9 kBtu/ft² across 975,170 sq ft works out to about 73 billion Btu (21,406 MWh-equivalent) in 2022. Its source EUI of 97.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 3,147,814 kWh of electricity and 26,104 thousand gallons of water for the year.

Which law requires 600 - 435 West 23rd Street to report its energy use?

600 - 435 West 23rd Street 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 2022 disclosure (source record nyc:6663304:2022). 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.