123 Antwerp St

How does 123 Antwerp St compare with other multifamily housing buildings in Boston?

The latest disclosures cover 2,174 multifamily housing buildings in Boston, out of 6,305 buildings citywide. 123 Antwerp St's ENERGY STAR score of 84 compares with an average of 71 across the 1,225 that report a score; it scores higher than 55% of them and lower than 43%. Its site EUI of 43.5 kBtu/ft² is about 36% below the average of 67.7 kBtu/ft² — it uses less energy per square foot than the typical building in that group.

At 369,336 sq ft, it is about 536% above the average floor area of 58,087 sq ft for those buildings. 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 123 Antwerp St's energy performance changed over time?

BuildingCensus holds 3 Boston disclosures for 123 Antwerp St, covering report years 2022–2024. Its ENERGY STAR score went from 81 in 2022 to 84 in 2024 (+3 points); its best year on file was 2023, at 91. Site EUI moved from 51.7 kBtu/ft² (2022) to 43.5 kBtu/ft² (2024), a 16% decrease. Reported emissions went from 1,244 tCO₂e to 890 tCO₂e over the same span (down 28%).

What does an ENERGY STAR score of 84 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 84 means the building performs better than about 84% of its national peers. BuildingCensus bands the score into report-card grades; 84 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 Boston, 52% 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. 123 Antwerp St's 43.5 kBtu/ft² across 369,336 sq ft works out to about 16.1 billion Btu (4,709 MWh-equivalent) in 2024. The disclosure also reports 2,769,840 kWh of electricity and 66,140 therms of natural gas for the year.

Which law requires 123 Antwerp St to report its energy use?

123 Antwerp St reports under BERDO 2.0, the legal basis of Boston's Building Emissions Reduction and Disclosure Ordinance, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record boston:101727:2024). BERDO 2.0 sets emissions standards for buildings of 20,000+ sq ft or 15+ units, starting in 2025 or 2030 depending on building size, with an alternative-compliance payment of $234 per metric ton of CO₂e over the limit.