Lyon Building
Multifamily Housing in Seattle, WA · 607 3RD AVE · 98104
At a glance
Lyon Building is a 63,712-square-foot multifamily housing building at 607 3RD AVE in Seattle, Washington, built in 1910. In its 2025 Seattle benchmarking disclosure it reported an ENERGY STAR score of 33 out of 100 (grade D), a site energy-use intensity of 78.6 kBtu/ft² and 187 tCO₂e of greenhouse-gas emissions. That score is higher than 4% of the 1,652 scored multifamily housing buildings in Seattle.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 33 (band D) |
| Site EUI | 78.6 kBtu/ft² |
| Source EUI | 149.8 kBtu/ft² |
| GHG emissions | 187 tCO₂e |
| GHG intensity | 3.3 kgCO₂e/ft² |
| Electricity | 589,639 kWh |
| Natural gas | 6,741 therms |
| Gross floor area | 63,712 sq ft |
| Source record | seattle:13:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 33 | -27 | 78.6 kBtu/ft² | 187 tCO₂e |
| 2024 | 60 | +19 | 56.9 kBtu/ft² | 56 tCO₂e |
| 2023 | 41 | +2 | 73.8 kBtu/ft² | 165 tCO₂e |
| 2022 | 39 | +16 | 75.4 kBtu/ft² | 157 tCO₂e |
| 2021 | 23 | +16 | 82.3 kBtu/ft² | 168 tCO₂e |
| 2020 | 7 | -23 | 73.6 kBtu/ft² | 143 tCO₂e |
| 2019 | 30 | +17 | 73.1 kBtu/ft² | 160 tCO₂e |
| 2018 | 13 | +10 | 92.8 kBtu/ft² | 236 tCO₂e |
| 2017 | 3 | +2 | 89.8 kBtu/ft² | 194 tCO₂e |
| 2016 | 1 | -1 | 81.5 kBtu/ft² | 152 tCO₂e |
| 2015 | 2 | 81.7 kBtu/ft² | 173 tCO₂e |
Compliance context
Seattle Energy Benchmarking Ordinance (SMC 22.920)
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.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 607 3RD AVE
- City
- Seattle
- State
- Washington
- ZIP
- 98104
- Coordinates
- 47.60284, -122.33184
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Lyon Building 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. Lyon Building's ENERGY STAR score of 33 compares with an average of 83 across the 1,652 that report a score; it scores higher than 4% of them and lower than 96%. Its site EUI of 78.6 kBtu/ft² is about 125% above the average of 34.9 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 3.3 kgCO₂e/ft² is about 374% above the group average of 0.7 kgCO₂e/ft².
At 63,712 sq ft, it is about 26% below the average floor area of 86,468 sq ft for those buildings. It was built in 1910, 73 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 Lyon Building's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Lyon Building, covering report years 2015–2025. Its ENERGY STAR score went from 2 in 2015 to 33 in 2025 (+31 points); its best year on file was 2024, at 60. Site EUI moved from 81.7 kBtu/ft² (2015) to 78.6 kBtu/ft² (2025), a 4% decrease. Reported emissions went from 173 tCO₂e to 187 tCO₂e over the same span (up 8%).
What does an ENERGY STAR score of 33 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 33 means the building performs better than about 33% of its national peers. BuildingCensus bands the score into report-card grades; 33 falls in band D — lowest band (1–54). It sits 42 points below 75, the threshold for ENERGY STAR certification. 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. Lyon Building's 78.6 kBtu/ft² across 63,712 sq ft works out to about 5 billion Btu (1,468 MWh-equivalent) in 2025. Its source EUI of 149.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 589,639 kWh of electricity and 6,741 therms of natural gas for the year.
Which law requires Lyon Building to report its energy use?
Lyon Building 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:13:2025). 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.
More multifamily housing buildings in Seattle
- Oxford Crest Apt· 63,681 sq ft · score 89 (A)
- Northbrook Place· 63,670 sq ft · score 54 (D)
- Element 42· 63,597 sq ft · score 96 (A)
- The Daniels Apts· 63,590 sq ft · score 99 (A)
- The Edge· 63,505 sq ft · score 100 (A)
- Harbor Park Condominium· 63,414 sq ft · score 38 (D)
- Multifamily Housing buildings in Seattle· 1,971 benchmarked
- All Seattle benchmarked buildings· Seattle Energy Benchmarking Ordinance (SMC 22.920)
- Most efficient large buildings in Seattle
- Least efficient large buildings in Seattle
- Biggest emitters in Seattle
Frequently asked questions
What is Lyon Building's energy grade?
Lyon Building scores 33 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2025 Seattle disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Lyon Building use?
Its 2025 site energy-use intensity was 78.6 kBtu/ft² (149.8 kBtu/ft² source) across 63,712 sq ft, including 589,639 kWh of electricity and 6,741 therms of natural gas.
What are Lyon Building's carbon emissions?
Lyon Building reported 187 tCO₂e of greenhouse-gas emissions (3.3 kgCO₂e/ft²) for 2025.
Where is Lyon Building?
Lyon Building is at 607 3RD AVE, in Seattle, Washington 98104. Its coordinates are 47.60284, -122.33184 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Lyon Building and when was it built?
Lyon Building has 63,712 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1910 as its year built. It is classed as multifamily housing.
Is Lyon Building covered by the Seattle Energy Benchmarking Ordinance (SMC 22.920)?
Yes — it appears in the 2025 Building Energy Benchmarking disclosure, which lists the buildings reporting under the Seattle Energy Benchmarking Ordinance (SMC 22.920).
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About this data
Source: Building Energy Benchmarking (Seattle Energy Benchmarking Ordinance (SMC 22.920)), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Lyon Building, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/lyon-building-14f314bd (data as of October 2, 2026).