At a glance
1633 Westlake Building is a 189,775-square-foot office building at 1633 WESTLAKE AVE N in Seattle, Washington, built in 2000. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 24.0 kBtu/ft² and 15 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 24.0 kBtu/ft² |
| Source EUI | 67.1 kBtu/ft² |
| GHG emissions | 15 tCO₂e |
| GHG intensity | 0.1 kgCO₂e/ft² |
| Electricity | 722,011 kWh |
| Gross floor area | 189,775 sq ft |
| Source record | seattle:681:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 24.0 kBtu/ft² | 15 tCO₂e | |
| 2024 | — | 22.9 kBtu/ft² | 14 tCO₂e | |
| 2023 | 99 | +1 | 23.6 kBtu/ft² | 14 tCO₂e |
| 2022 | 98 | +1 | 27.9 kBtu/ft² | 17 tCO₂e |
| 2021 | 97 | -1 | 28.9 kBtu/ft² | 17 tCO₂e |
| 2020 | 98 | +7 | 28.4 kBtu/ft² | 17 tCO₂e |
| 2019 | 91 | +4 | 39.8 kBtu/ft² | 23 tCO₂e |
| 2018 | 87 | -3 | 46.7 kBtu/ft² | 27 tCO₂e |
| 2017 | 90 | -3 | 47.7 kBtu/ft² | 29 tCO₂e |
| 2016 | 93 | ±0 | 49.5 kBtu/ft² | 30 tCO₂e |
| 2015 | 93 | 48.9 kBtu/ft² | 29 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
- 1633 WESTLAKE AVE N
- City
- Seattle
- State
- Washington
- ZIP
- 98109
- Coordinates
- 47.63347, -122.34078
Within ~1 km
Nearby benchmarked buildings
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- Dexter Station Officescore 83
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- One Lakefront At 1287score 98
Multifamily Housing · 395,317 sq ft
- Westlake Steps & Marina Sluscore 99
Multifamily Housing · 393,641 sq ft
- Juxt Apartments (2017)score 100
Multifamily Housing · 391,386 sq ft
- West Lake Union Centerscore 90
Office · 381,511 sq ft
See also: most efficient in Seattle · biggest emitters
How does 1633 Westlake Building compare with other office buildings in Seattle?
The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. Its site EUI of 24.0 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 0.1 kgCO₂e/ft² is about 79% below the group average of 0.7 kgCO₂e/ft².
At 189,775 sq ft, it is roughly in line with the average floor area of 196,452 sq ft for those buildings. It was built in 2000, 35 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 1633 Westlake Building's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for 1633 Westlake Building, covering report years 2015–2025. Its ENERGY STAR score went from 93 in 2015 to 99 in 2023 (+6 points). Site EUI moved from 48.9 kBtu/ft² (2015) to 24.0 kBtu/ft² (2025), a 51% decrease. Reported emissions went from 29 tCO₂e to 15 tCO₂e over the same span (down 49%).
What does a site EUI of 24.0 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. 1633 Westlake Building's 24.0 kBtu/ft² across 189,775 sq ft works out to about 4.6 billion Btu (1,335 MWh-equivalent) in 2025. Its source EUI of 67.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 722,011 kWh of electricity for the year.
Which law requires 1633 Westlake Building to report its energy use?
1633 Westlake 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:681:2025). 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 office buildings in Seattle
- 1200 3rd Avenue· 189,175 sq ft · score 63 (C)
- Pier 69· 187,130 sq ft · score 64 (C)
- Abraham Lincoln Building· 186,768 sq ft · score 88 (A)
- 1101 Westlake· 185,116 sq ft · EUI 24.3 kBtu/ft²
- Interurban Exchange Ii (Wainwright)· 184,482 sq ft · score 94 (A)
- 333 Elliott· 183,964 sq ft · score 87 (A)
- Office buildings in Seattle· 497 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 1633 Westlake Building's energy grade?
1633 Westlake Building did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 24.0 kBtu/ft².
How much energy does 1633 Westlake Building use?
Its 2025 site energy-use intensity was 24.0 kBtu/ft² (67.1 kBtu/ft² source) across 189,775 sq ft, including 722,011 kWh of electricity.
What are 1633 Westlake Building's carbon emissions?
1633 Westlake Building reported 15 tCO₂e of greenhouse-gas emissions (0.1 kgCO₂e/ft²) for 2025.
Where is 1633 Westlake Building?
1633 Westlake Building is at 1633 WESTLAKE AVE N, in Seattle, Washington 98109. Its coordinates are 47.63347, -122.34078 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is 1633 Westlake Building and when was it built?
1633 Westlake Building has 189,775 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2000 as its year built. It is classed as office.
Is 1633 Westlake 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, “1633 Westlake Building, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/1633-westlake-building-96b5b309 (data as of October 2, 2026).