99 Summer St

How does 99 Summer St compare with other office buildings in Boston?

The latest disclosures cover 467 office buildings in Boston, out of 6,305 buildings citywide. 99 Summer St's ENERGY STAR score of 80 compares with an average of 71 across the 356 that report a score; it scores higher than 58% of them and lower than 40%. Its site EUI of 43.2 kBtu/ft² is about 30% below the average of 61.7 kBtu/ft² — it uses less energy per square foot than the typical building in that group.

At 291,332 sq ft, it is about 52% above the average floor area of 191,803 sq ft for those buildings. Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².

How has 99 Summer St's energy performance changed over time?

BuildingCensus holds 3 Boston disclosures for 99 Summer St, covering report years 2022–2024. Its ENERGY STAR score went from 82 in 2022 to 80 in 2024 (-2 points); its best year on file was 2022, at 82. Site EUI moved from 42.1 kBtu/ft² (2022) to 43.2 kBtu/ft² (2024), an 3% increase. Reported emissions went from 892 tCO₂e to 707 tCO₂e over the same span (down 21%).

What does an ENERGY STAR score of 80 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 80 means the building performs better than about 80% of its national peers. BuildingCensus bands the score into report-card grades; 80 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. 99 Summer St's 43.2 kBtu/ft² across 291,332 sq ft works out to about 12.6 billion Btu (3,688 MWh-equivalent) in 2024. The disclosure also reports 2,912,928 kWh of electricity and 26,323 therms of natural gas for the year.

Which law requires 99 Summer St to report its energy use?

99 Summer 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:100257:2024). 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.