Union Arms

How does Union Arms 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. Union Arms's ENERGY STAR score of 78 compares with an average of 83 across the 1,652 that report a score; it scores higher than 26% of them and lower than 73%. Its site EUI of 37.4 kBtu/ft² is roughly in line with the average of 34.9 kBtu/ft². Its emissions intensity of 0.8 kgCO₂e/ft² is about 21% above the group average of 0.7 kgCO₂e/ft².

At 67,304 sq ft, it is about 22% below the average floor area of 86,468 sq ft for those buildings. It was built in 1925, 58 years earlier 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 Union Arms's energy performance changed over time?

BuildingCensus holds 11 Seattle disclosures for Union Arms, covering report years 2015–2025. Its ENERGY STAR score went from 48 in 2015 to 78 in 2025 (+30 points); its best year on file was 2021, at 94. Site EUI moved from 35.8 kBtu/ft² (2015) to 37.4 kBtu/ft² (2025), an 4% increase. Reported emissions went from 59 tCO₂e to 52 tCO₂e over the same span (down 12%).

What does an ENERGY STAR score of 78 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 78 means the building performs better than about 78% of its national peers. BuildingCensus bands the score into report-card grades; 78 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. Union Arms's 37.4 kBtu/ft² across 67,304 sq ft works out to about 2.5 billion Btu (738 MWh-equivalent) in 2025. Its source EUI of 81.0 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 422,555 kWh of electricity and 8,248 therms of natural gas for the year.

Which law requires Union Arms to report its energy use?

Union Arms 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:26246:2025). 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.