Alley 24 East

How does Alley 24 East compare with other office buildings in Seattle?

The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. Alley 24 East's ENERGY STAR score of 89 compares with an average of 76 across the 378 that report a score; it scores higher than 67% of them and lower than 30%. Its site EUI of 33.0 kBtu/ft² is about 26% below the average of 44.8 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 0.2 kgCO₂e/ft² is about 73% below the group average of 0.7 kgCO₂e/ft².

At 336,700 sq ft, it is about 71% above the average floor area of 196,452 sq ft for those buildings. It was built in 2005, 40 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 Alley 24 East's energy performance changed over time?

BuildingCensus holds 11 Seattle disclosures for Alley 24 East, covering report years 2015–2025. Its ENERGY STAR score went from 94 in 2015 to 89 in 2025 (-5 points); its best year on file was 2015, at 94. Site EUI moved from 48.6 kBtu/ft² (2015) to 33.0 kBtu/ft² (2025), a 32% decrease. Reported emissions went from 56 tCO₂e to 41 tCO₂e over the same span (down 27%).

What does an ENERGY STAR score of 89 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 89 means the building performs better than about 89% of its national peers. BuildingCensus bands the score into report-card grades; 89 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 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. Alley 24 East's 33.0 kBtu/ft² across 336,700 sq ft works out to about 11.1 billion Btu (3,256 MWh-equivalent) in 2025. Its source EUI of 92.5 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 2,085,642 kWh of electricity for the year.

Which law requires Alley 24 East to report its energy use?

Alley 24 East 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:561:2025). 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.