4730 California Apartments

How does 4730 California Apartments compare with other multifamily housing buildings in Seattle?

The latest disclosures cover 1,971 multifamily housing buildings in Seattle, out of 3,871 buildings citywide. 4730 California Apartments's ENERGY STAR score of 83 compares with an average of 83 across the 1,652 that report a score; it scores higher than 34% of them and lower than 64%. Its site EUI of 37.5 kBtu/ft² is roughly in line with the average of 34.9 kBtu/ft². Its emissions intensity of 0.6 kgCO₂e/ft² is about 17% below the group average of 0.7 kgCO₂e/ft².

At 113,204 sq ft, it is about 31% above the average floor area of 86,468 sq ft for those buildings. It was built in 2014, 31 years later than the group's average year built (1983). 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 4730 California Apartments's energy performance changed over time?

BuildingCensus holds 11 Seattle disclosures for 4730 California Apartments, covering report years 2015–2025. Its ENERGY STAR score went from 81 in 2015 to 83 in 2025 (+2 points); its best year on file was 2021, at 92. Site EUI moved from 38.6 kBtu/ft² (2015) to 37.5 kBtu/ft² (2025), a 3% decrease. Reported emissions went from 41 tCO₂e to 50 tCO₂e over the same span (up 21%).

What does an ENERGY STAR score of 83 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 83 means the building performs better than about 83% of its national peers. BuildingCensus bands the score into report-card grades; 83 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 Seattle, 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. 4730 California Apartments's 37.5 kBtu/ft² across 113,204 sq ft works out to about 4.2 billion Btu (1,244 MWh-equivalent) in 2025. Its source EUI of 91.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 752,379 kWh of electricity and 6,670 therms of natural gas for the year.

Which law requires 4730 California Apartments to report its energy use?

4730 California Apartments reports under the Seattle Energy Benchmarking Ordinance (SMC 22.920), the legal basis of Seattle's Building Energy Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2025 disclosure (source record seattle:25061:2025). Seattle's Building Emissions Performance Standard (adopted 2023) applies to buildings over 20,000 sq ft: benchmarking verification is due 2027–2030 and initial emissions targets 2031–2035, reaching net zero by 2041–2050, with fines for non-compliance.