Seattle Biomedical Building
Mixed Use Property in Seattle, WA · 307 WESTLAKE AVE N · 98109
At a glance
Seattle Biomedical Building is a 159,700-square-foot mixed use property building at 307 WESTLAKE AVE N in Seattle, Washington, built in 2003. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 95.9 kBtu/ft² and 175 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 95.9 kBtu/ft² |
| Source EUI | 229.0 kBtu/ft² |
| GHG emissions | 175 tCO₂e |
| GHG intensity | 1.5 kgCO₂e/ft² |
| Electricity | 2,518,045 kWh |
| Natural gas | 26,390 therms |
| Gross floor area | 159,700 sq ft |
| Source record | seattle:480:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 95.9 kBtu/ft² | 175 tCO₂e | |
| 2024 | — | 163.4 kBtu/ft² | 275 tCO₂e | |
| 2023 | — | 161.7 kBtu/ft² | 264 tCO₂e | |
| 2022 | — | 204.9 kBtu/ft² | 451 tCO₂e | |
| 2021 | — | 238.4 kBtu/ft² | 548 tCO₂e | |
| 2020 | — | 230.3 kBtu/ft² | 601 tCO₂e | |
| 2019 | — | 217.5 kBtu/ft² | 581 tCO₂e | |
| 2018 | — | 261.8 kBtu/ft² | 768 tCO₂e | |
| 2017 | — | 268.2 kBtu/ft² | 707 tCO₂e | |
| 2016 | — | 270.4 kBtu/ft² | 702 tCO₂e | |
| 2015 | — | 233.7 kBtu/ft² | 543 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
- 307 WESTLAKE AVE N
- City
- Seattle
- State
- Washington
- ZIP
- 98109
- Coordinates
- 47.62121, -122.33885
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Seattle Biomedical Building compare with other mixed use property buildings in Seattle?
The latest disclosures cover 157 mixed use property buildings in Seattle, out of 3,871 buildings citywide. Its site EUI of 95.9 kBtu/ft² is about 40% above the average of 68.7 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 1.5 kgCO₂e/ft² is roughly in line with the group average of 1.4 kgCO₂e/ft².
At 159,700 sq ft, it is roughly in line with the average floor area of 165,352 sq ft for those buildings. It was built in 2003, 35 years later than the group's average year built (1968). Across all 24 jurisdictions BuildingCensus covers, the 1,212 mixed use property buildings average an ENERGY STAR score of 69 and a site EUI of 79.8 kBtu/ft².
How has Seattle Biomedical Building's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Seattle Biomedical Building, covering report years 2015–2025. Site EUI moved from 233.7 kBtu/ft² (2015) to 95.9 kBtu/ft² (2025), a 59% decrease. Reported emissions went from 543 tCO₂e to 175 tCO₂e over the same span (down 68%).
What does a site EUI of 95.9 kBtu/ft² mean?
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. Seattle Biomedical Building's 95.9 kBtu/ft² across 159,700 sq ft works out to about 15.3 billion Btu (4,488 MWh-equivalent) in 2025. Its source EUI of 229.0 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 2,518,045 kWh of electricity and 26,390 therms of natural gas for the year.
Which law requires Seattle Biomedical Building to report its energy use?
Seattle Biomedical 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:480:2025). 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 mixed use property buildings in Seattle
- 12th Avenue Arts· 158,967 sq ft
- Airport Way Ctr - Bldg C· 145,158 sq ft · EUI 49.1 kBtu/ft²
- Cogir Queen Anne I· 145,085 sq ft · score 98 (A)
- Broadway Market And Harvard Apts· 140,823 sq ft · EUI 19.3 kBtu/ft²
- Main Market· 137,400 sq ft · EUI 106.3 kBtu/ft²
- Rainier Worklofts & Storage LLC. (Phase II)· 136,769 sq ft · EUI 16.6 kBtu/ft²
- Mixed Use Property buildings in Seattle· 157 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 Seattle Biomedical Building's energy grade?
Seattle Biomedical Building did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 95.9 kBtu/ft².
How much energy does Seattle Biomedical Building use?
Its 2025 site energy-use intensity was 95.9 kBtu/ft² (229.0 kBtu/ft² source) across 159,700 sq ft, including 2,518,045 kWh of electricity and 26,390 therms of natural gas.
What are Seattle Biomedical Building's carbon emissions?
Seattle Biomedical Building reported 175 tCO₂e of greenhouse-gas emissions (1.5 kgCO₂e/ft²) for 2025.
Where is Seattle Biomedical Building?
Seattle Biomedical Building is at 307 WESTLAKE AVE N, in Seattle, Washington 98109. Its coordinates are 47.62121, -122.33885 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Seattle Biomedical Building and when was it built?
Seattle Biomedical Building has 159,700 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2003 as its year built. It is classed as mixed use property.
Is Seattle Biomedical 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, “Seattle Biomedical Building, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/seattle-biomedical-building-f772694c (data as of October 2, 2026).