Stone 34

How does Stone 34 compare with other office buildings in Seattle?

The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. Stone 34's ENERGY STAR score of 88 compares with an average of 76 across the 378 that report a score; it scores higher than 63% of them and lower than 33%. Its site EUI of 49.2 kBtu/ft² is roughly in line with the average of 44.8 kBtu/ft². Its emissions intensity of 1.1 kgCO₂e/ft² is about 57% above the group average of 0.7 kgCO₂e/ft².

At 206,126 sq ft, it is roughly in line with the average floor area of 196,452 sq ft for those buildings. It was built in 2013, 48 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 Stone 34's energy performance changed over time?

BuildingCensus holds 11 Seattle disclosures for Stone 34, covering report years 2015–2025. Its ENERGY STAR score went from 100 in 2015 to 88 in 2025 (-12 points); its best year on file was 2015, at 100. Site EUI moved from 25.2 kBtu/ft² (2015) to 49.2 kBtu/ft² (2025), an 95% increase. Reported emissions went from 47 tCO₂e to 154 tCO₂e over the same span (up 230%).

What does an ENERGY STAR score of 88 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 88 means the building performs better than about 88% of its national peers. BuildingCensus bands the score into report-card grades; 88 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. Stone 34's 49.2 kBtu/ft² across 206,126 sq ft works out to about 10.1 billion Btu (2,972 MWh-equivalent) in 2025. Its source EUI of 107.5 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,314,003 kWh of electricity and 24,314 therms of natural gas for the year.

Which law requires Stone 34 to report its energy use?

Stone 34 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:20868:2025). 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.