100 Landsdowne Street

How does 100 Landsdowne Street compare with other multifamily housing buildings in Cambridge?

The latest disclosures cover 187 multifamily housing buildings in Cambridge, out of 902 buildings citywide. 100 Landsdowne Street's ENERGY STAR score of 43 compares with an average of 75 across the 155 that report a score; it scores higher than 14% of them and lower than 86%. Its site EUI of 46.6 kBtu/ft² is about 18% below the average of 56.9 kBtu/ft² — it uses less energy per square foot than the typical building in that group.

At 239,086 sq ft, it is about 81% above the average floor area of 132,415 sq ft for those buildings. It was built in 2005, 32 years later than the group's average year built (1973). 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 100 Landsdowne Street's energy performance changed over time?

BuildingCensus holds 10 Cambridge disclosures for 100 Landsdowne Street, covering report years 2015–2024. Its ENERGY STAR score went from 33 in 2015 to 43 in 2024 (+10 points); its best year on file was 2022, at 46. Site EUI moved from 57.8 kBtu/ft² (2015) to 46.6 kBtu/ft² (2024), a 19% decrease. Reported emissions went from 889 tCO₂e to 711 tCO₂e over the same span (down 20%).

What does an ENERGY STAR score of 43 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 43 means the building performs better than about 43% of its national peers. BuildingCensus bands the score into report-card grades; 43 falls in band D — lowest band (1–54). It sits 32 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. 100 Landsdowne Street's 46.6 kBtu/ft² across 239,086 sq ft works out to about 11.1 billion Btu (3,265 MWh-equivalent) in 2024. Its source EUI of 94.5 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,821,669 kWh of electricity, 49,373 therms of natural gas and 8,410 thousand gallons of water for the year.

Which law requires 100 Landsdowne Street to report its energy use?

100 Landsdowne 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:B1003:2024). 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).