306 EAST 171 STREET

How does 306 EAST 171 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. 306 EAST 171 STREET's ENERGY STAR score of 33 compares with an average of 63 across the 22,829 that report a score; it scores higher than 19% of them and lower than 80%. Its site EUI of 97.2 kBtu/ft² is about 30% above the average of 74.9 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 6.1 kgCO₂e/ft² is about 17% above the group average of 5.2 kgCO₂e/ft².

At 72,000 sq ft, it is about 29% below the average floor area of 100,951 sq ft for those buildings. It was built in 1928, 24 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 306 EAST 171 STREET's energy performance changed over time?

BuildingCensus holds 2 New York City disclosures for 306 EAST 171 STREET, covering report years 2023–2024. Its ENERGY STAR score went from 35 in 2023 to 33 in 2024 (-2 points); its best year on file was 2023, at 35. Site EUI moved from 93.3 kBtu/ft² (2023) to 97.2 kBtu/ft² (2024), an 4% increase. Reported emissions went from 412 tCO₂e to 437 tCO₂e over the same span (up 6%).

What does an ENERGY STAR score of 33 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 33 means the building performs better than about 33% of its national peers. BuildingCensus bands the score into report-card grades; 33 falls in band D — lowest band (1–54). It sits 42 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. 306 EAST 171 STREET's 97.2 kBtu/ft² across 72,000 sq ft works out to about 7 billion Btu (2,051 MWh-equivalent) in 2024. Its source EUI of 127.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 308,957 kWh of electricity and 59,471 therms of natural gas for the year.

Which law requires 306 EAST 171 STREET to report its energy use?

306 EAST 171 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:33508459:2024). 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.