Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 59.5 kBtu/ft² |
| Source EUI | 166.5 kBtu/ft² |
| GHG emissions | 32 tCO₂e |
| GHG intensity | 0.3 kgCO₂e/ft² |
| Electricity | 1,598,393 kWh |
| Gross floor area | 139,282 sq ft |
| Source record | seattle:471:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 59.5 kBtu/ft² | 32 tCO₂e | |
| 2024 | 64 | +2 | 69.5 kBtu/ft² | 37 tCO₂e |
| 2023 | 62 | +20 | 72.4 kBtu/ft² | 39 tCO₂e |
| 2022 | 42 | -22 | 93.4 kBtu/ft² | 50 tCO₂e |
| 2021 | 64 | -12 | 71.6 kBtu/ft² | 38 tCO₂e |
| 2020 | 76 | +4 | 61.5 kBtu/ft² | 33 tCO₂e |
| 2019 | 72 | +10 | 61.0 kBtu/ft² | 31 tCO₂e |
| 2018 | 62 | -27 | 70.8 kBtu/ft² | 36 tCO₂e |
| 2017 | 89 | -7 | 48.0 kBtu/ft² | 25 tCO₂e |
| 2016 | 96 | +22 | 37.3 kBtu/ft² | 19 tCO₂e |
| 2015 | 74 | 60.7 kBtu/ft² | 31 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.
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Location
- Address
- 428 WESTLAKE AVE N
- City
- Seattle
- State
- Washington
- ZIP
- 98109
- Coordinates
- 47.62286, -122.33804
Within ~1 km
Nearby benchmarked buildings
Office · 1,599,394 sq ft
- Day 1 Tower And Spheres (Amazon)score 93
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- Onni South Lake Unionscore 77
Multifamily Housing · 1,546,084 sq ft
- Amazon Doppler Buildingscore 90
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- Insignia Condosscore 47
Multifamily Housing · 1,464,631 sq ft
- Amazon Nitroscore 94
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See also: most efficient in Seattle · biggest emitters
Frequently asked questions
What is 428 Westlake Building's energy grade?
428 Westlake Building did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 59.5 kBtu/ft².
How much energy does 428 Westlake Building use?
Its 2025 site energy-use intensity was 59.5 kBtu/ft² (166.5 kBtu/ft² source) across 139,282 sq ft, including 1,598,393 kWh of electricity.
What are 428 Westlake Building's carbon emissions?
428 Westlake Building reported 32 tCO₂e of greenhouse-gas emissions (0.3 kgCO₂e/ft²) for 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.
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Dataset updated . Source: Building Energy Benchmarking disclosure, record seattle:471:2025.