1134 Willow St

How does 1134 Willow St compare with other multifamily housing buildings in San José?

The latest disclosures cover 476 multifamily housing buildings in San José, out of 1,790 buildings citywide. 1134 Willow St's ENERGY STAR score of 76 compares with an average of 86 across the 435 that report a score; it scores higher than 17% of them and lower than 81%. Its site EUI of 39.5 kBtu/ft² is about 12% above the average of 35.3 kBtu/ft² — it uses more energy per square foot than the typical building in that group.

At 23,750 sq ft, it is about 85% below the average floor area of 157,540 sq ft for those buildings. Its 1985 construction date is close to the group's average year built (1987). 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 1134 Willow St's energy performance changed over time?

BuildingCensus holds 6 San José disclosures for 1134 Willow St, covering report years 2019–2024. Its ENERGY STAR score went from 83 in 2019 to 76 in 2024 (-7 points); its best year on file was 2019, at 83. Site EUI moved from 38.8 kBtu/ft² (2019) to 39.5 kBtu/ft² (2024), an 2% increase. Reported emissions went from 56 tCO₂e to 56 tCO₂e over the same span (down 1%).

What does an ENERGY STAR score of 76 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 76 means the building performs better than about 76% of its national peers. BuildingCensus bands the score into report-card grades; 76 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 San José, 69% 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. 1134 Willow St's 39.5 kBtu/ft² across 23,750 sq ft works out to about 0.9 billion Btu (275 MWh-equivalent) in 2024. Its source EUI of 73.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 129,197 kWh of electricity, 4,965 therms of natural gas and 1,428 thousand gallons of water for the year.

Which law requires 1134 Willow St to report its energy use?

1134 Willow St reports under San José Municipal Code Ch. 17.85 (Energy and Water Building Performance Ordinance), the legal basis of San José's Energy and Water Building Performance Ordinance, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record san_jose:1349-0-00:2024). San José's BPO requires buildings over 20,000 sq ft to benchmark annually and complete beyond-benchmarking performance improvements on a rolling schedule.