Milstein - 21 South End Avenue

How does Milstein - 21 South 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. Milstein - 21 South End Avenue's ENERGY STAR score of 32 compares with an average of 63 across the 22,829 that report a score; it scores higher than 18% of them and lower than 81%. Its site EUI of 73.2 kBtu/ft² is roughly in line with 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 5.7 kgCO₂e/ft² is roughly in line with the group average of 5.2 kgCO₂e/ft².

At 248,600 sq ft, it is about 146% above the average floor area of 100,951 sq ft for those buildings. It was built in 1988, 36 years later 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 Milstein - 21 South End Avenue's energy performance changed over time?

BuildingCensus holds 3 New York City disclosures for Milstein - 21 South End Avenue, covering report years 2022–2024. Its ENERGY STAR score went from 28 in 2022 to 32 in 2024 (+4 points). Site EUI moved from 90.6 kBtu/ft² (2022) to 73.2 kBtu/ft² (2024), a 19% decrease. Reported emissions went from 1,296 tCO₂e to 1,413 tCO₂e over the same span (up 9%).

What does an ENERGY STAR score of 32 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 32 means the building performs better than about 32% of its national peers. BuildingCensus bands the score into report-card grades; 32 falls in band D — lowest band (1–54). It sits 43 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. Milstein - 21 South End Avenue's 73.2 kBtu/ft² across 248,600 sq ft works out to about 18.2 billion Btu (5,333 MWh-equivalent) in 2024. Its source EUI of 127.6 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 2,112,653 kWh of electricity, 109,855 therms of natural gas and 11,789 thousand gallons of water for the year.

Which law requires Milstein - 21 South End Avenue to report its energy use?

Milstein - 21 South 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:2654417:2024). 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.