311 West 231st Street

How does 311 West 231st Street compare with other senior living community buildings in New York City?

The latest disclosures cover 296 senior living community buildings in New York City, out of 48,310 buildings citywide. 311 West 231st Street's ENERGY STAR score of 46 compares with an average of 57 across the 229 that report a score; it scores higher than 39% of them and lower than 59%. Its site EUI of 83.1 kBtu/ft² is about 26% below the average of 112.0 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 9.3 kgCO₂e/ft² is roughly in line with the group average of 8.5 kgCO₂e/ft².

At 58,795 sq ft, it is about half of the average floor area of 108,590 sq ft for those buildings. Its 1975 construction date is close to the group's average year built (1974). Across all 24 jurisdictions BuildingCensus covers, the 1,181 senior living community buildings average an ENERGY STAR score of 71 and a site EUI of 73.6 kBtu/ft².

How has 311 West 231st Street's energy performance changed over time?

BuildingCensus holds 3 New York City disclosures for 311 West 231st Street, covering report years 2022–2024. Site EUI moved from 127.4 kBtu/ft² (2022) to 83.1 kBtu/ft² (2024), a 35% decrease. Reported emissions went from 566 tCO₂e to 549 tCO₂e over the same span (down 3%).

What does an ENERGY STAR score of 46 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 46 means the building performs better than about 46% of its national peers. BuildingCensus bands the score into report-card grades; 46 falls in band D — lowest band (1–54). It sits 29 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. 311 West 231st Street's 83.1 kBtu/ft² across 58,795 sq ft works out to about 4.9 billion Btu (1,432 MWh-equivalent) in 2024. Its source EUI of 225.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,363,967 kWh of electricity and 1,996 therms of natural gas for the year.

Which law requires 311 West 231st Street to report its energy use?

311 West 231st 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 2024 disclosure (source record nyc:3109946:2024). 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.