325 Main St

How does 325 Main St compare with other office buildings in Cambridge?

The latest disclosures cover 117 office buildings in Cambridge, out of 902 buildings citywide. 325 Main St's ENERGY STAR score of 87 compares with an average of 64 across the 94 that report a score; it scores higher than 78% of them and lower than 17%. Its site EUI of 47.5 kBtu/ft² is about 40% below the average of 78.7 kBtu/ft² — it uses less energy per square foot than the typical building in that group.

At 494,512 sq ft, it is about 308% above the average floor area of 121,167 sq ft for those buildings. It was built in 2022, 57 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 325 Main St's energy performance changed over time?

BuildingCensus holds 7 Cambridge disclosures for 325 Main St, covering report years 2018–2024. Its ENERGY STAR score went from 12 in 2018 to 87 in 2024 (+75 points); its best year on file was 2022, at 92. Site EUI moved from 97.6 kBtu/ft² (2018) to 47.5 kBtu/ft² (2024), a 51% decrease. Reported emissions went from 706 tCO₂e to 1,576 tCO₂e over the same span (up 123%).

What does an ENERGY STAR score of 87 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 87 means the building performs better than about 87% of its national peers. BuildingCensus bands the score into report-card grades; 87 falls in band A — high performer (85–100). 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 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. 325 Main St's 47.5 kBtu/ft² across 494,512 sq ft works out to about 23.5 billion Btu (6,884 MWh-equivalent) in 2024. Its source EUI of 110.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 5,048,485 kWh of electricity, 62,473 therms of natural gas and 13,339 thousand gallons of water for the year.

Which law requires 325 Main St to report its energy use?

325 Main St 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:B1847:2024). 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).