Elliott Bay Office Park

How does Elliott Bay Office Park compare with other office buildings in Seattle?

The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. Elliott Bay Office Park's ENERGY STAR score of 97 compares with an average of 76 across the 378 that report a score; it scores higher than 90% of them and lower than 7%. Its site EUI of 23.4 kBtu/ft² is about half of 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 0.4 kgCO₂e/ft² is about 37% below the group average of 0.7 kgCO₂e/ft².

At 275,734 sq ft, it is about 40% above the average floor area of 196,452 sq ft for those buildings. It was built in 1981, 16 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 Elliott Bay Office Park's energy performance changed over time?

BuildingCensus holds 11 Seattle disclosures for Elliott Bay Office Park, covering report years 2015–2025. Its ENERGY STAR score went from 67 in 2015 to 97 in 2025 (+30 points); its best year on file was 2020, at 98. Site EUI moved from 83.7 kBtu/ft² (2015) to 23.4 kBtu/ft² (2025), a 72% decrease. Reported emissions went from 112 tCO₂e to 101 tCO₂e over the same span (down 10%).

What does an ENERGY STAR score of 97 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 97 means the building performs better than about 97% of its national peers. BuildingCensus bands the score into report-card grades; 97 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. Elliott Bay Office Park's 23.4 kBtu/ft² across 275,734 sq ft works out to about 6.5 billion Btu (1,891 MWh-equivalent) in 2025. Its source EUI of 52.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,084,047 kWh of electricity and 16,635 therms of natural gas for the year.

Which law requires Elliott Bay Office Park to report its energy use?

Elliott Bay Office Park 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:443:2025). 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.