125 Mount Auburn Street

How does 125 Mount Auburn Street compare with other office buildings in Cambridge?

The latest disclosures cover 117 office buildings in Cambridge, out of 902 buildings citywide. 125 Mount Auburn Street's ENERGY STAR score of 32 compares with an average of 64 across the 94 that report a score; it scores higher than 13% of them and lower than 85%. Its site EUI of 91.9 kBtu/ft² is about 17% above the average of 78.7 kBtu/ft² — it uses more energy per square foot than the typical building in that group.

At 46,085 sq ft, it is about 62% below the average floor area of 121,167 sq ft for those buildings. It was built in 2001, 36 years later than the group's average year built (1965). 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 125 Mount Auburn Street's energy performance changed over time?

BuildingCensus holds 10 Cambridge disclosures for 125 Mount Auburn Street, covering report years 2015–2024. Its ENERGY STAR score went from 16 in 2015 to 32 in 2024 (+16 points). Site EUI moved from 120.8 kBtu/ft² (2015) to 91.9 kBtu/ft² (2024), a 24% decrease. Reported emissions went from 421 tCO₂e to 305 tCO₂e over the same span (down 28%).

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 Cambridge, 50% 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. 125 Mount Auburn Street's 91.9 kBtu/ft² across 46,085 sq ft works out to about 4.2 billion Btu (1,241 MWh-equivalent) in 2024. Its source EUI of 255.0 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,223,611 kWh of electricity, 597 therms of natural gas and 130 thousand gallons of water for the year.

Which law requires 125 Mount Auburn Street to report its energy use?

125 Mount Auburn Street reports under BEUDO, the legal basis of Cambridge's Building Energy Use Disclosure Ordinance (BEUDO), which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record cambridge:B1431:2024). Cambridge's 2023 BEUDO amendments require non-residential buildings of 100,000+ sq ft to reach net-zero emissions by 2035 (reductions starting 2026) and those of 25,000–100,000 sq ft by 2050 (starting 2030).