At a glance
West Tower is a 241,875-square-foot office building at 400 2ND AVE W in Seattle, Washington, built in 2000. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 28.6 kBtu/ft² and 52 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 28.6 kBtu/ft² |
| Source EUI | 74.0 kBtu/ft² |
| GHG emissions | 52 tCO₂e |
| GHG intensity | 0.3 kgCO₂e/ft² |
| Electricity | 1,244,067 kWh |
| Natural gas | 5,782 therms |
| Gross floor area | 241,875 sq ft |
| Source record | seattle:744:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 28.6 kBtu/ft² | 52 tCO₂e | |
| 2024 | — | 29.3 kBtu/ft² | 62 tCO₂e | |
| 2023 | 91 | +2 | 31.3 kBtu/ft² | 52 tCO₂e |
| 2022 | 89 | -2 | 36.2 kBtu/ft² | 61 tCO₂e |
| 2021 | 91 | ±0 | 34.9 kBtu/ft² | 65 tCO₂e |
| 2020 | 91 | -4 | 35.1 kBtu/ft² | 60 tCO₂e |
| 2019 | 95 | +7 | 41.3 kBtu/ft² | 58 tCO₂e |
| 2018 | 88 | +9 | 43.5 kBtu/ft² | 52 tCO₂e |
| 2017 | 79 | -9 | 49.8 kBtu/ft² | 60 tCO₂e |
| 2016 | 88 | -1 | 53.1 kBtu/ft² | 58 tCO₂e |
| 2015 | 89 | 50.1 kBtu/ft² | 54 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
- 400 2ND AVE W
- City
- Seattle
- State
- Washington
- ZIP
- 98119
- Coordinates
- 47.62225, -122.35915
Within ~1 km
Nearby benchmarked buildings
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- Olympus Aptsscore 97
Multifamily Housing · 590,869 sq ft
- Third And Broad Bldgscore 94
Office · 396,626 sq ft
- 2601 ELLIOTT AVEscore —
Office · 350,310 sq ft
Multifamily Housing · 308,940 sq ft
- Expo Apartmentsscore 97
Multifamily Housing · 301,831 sq ft
See also: most efficient in Seattle · biggest emitters
How does West Tower 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 28.6 kBtu/ft² is about 36% below 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 0.3 kgCO₂e/ft² is about 56% below the group average of 0.7 kgCO₂e/ft².
At 241,875 sq ft, it is about 23% above 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 West Tower's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for West Tower, covering report years 2015–2025. Its ENERGY STAR score went from 89 in 2015 to 91 in 2023 (+2 points); its best year on file was 2019, at 95. Site EUI moved from 50.1 kBtu/ft² (2015) to 28.6 kBtu/ft² (2025), a 43% decrease. Reported emissions went from 54 tCO₂e to 52 tCO₂e over the same span (down 3%).
What does a site EUI of 28.6 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. West Tower's 28.6 kBtu/ft² across 241,875 sq ft works out to about 6.9 billion Btu (2,027 MWh-equivalent) in 2025. Its source EUI of 74.0 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,244,067 kWh of electricity and 5,782 therms of natural gas for the year.
Which law requires West Tower to report its energy use?
West Tower 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:744:2025). 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
- Maritime Building· 241,685 sq ft · EUI 17.1 kBtu/ft²
- 3rd And Harrison· 240,700 sq ft · EUI 30.3 kBtu/ft²
- 1000 Dexter Phase Ii· 240,454 sq ft · score 86 (A)
- 6100 Building· 238,148 sq ft · score 94 (A)
- Fourth & Battery Building· 234,000 sq ft · score 83 (B)
- 1015 2nd Avenue Bldg· 232,045 sq ft · EUI 22.6 kBtu/ft²
- 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 West Tower's energy grade?
West Tower did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 28.6 kBtu/ft².
How much energy does West Tower use?
Its 2025 site energy-use intensity was 28.6 kBtu/ft² (74.0 kBtu/ft² source) across 241,875 sq ft, including 1,244,067 kWh of electricity and 5,782 therms of natural gas.
What are West Tower's carbon emissions?
West Tower reported 52 tCO₂e of greenhouse-gas emissions (0.3 kgCO₂e/ft²) for 2025.
Where is West Tower?
West Tower is at 400 2ND AVE W, in Seattle, Washington 98119. Its coordinates are 47.62225, -122.35915 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is West Tower and when was it built?
West Tower has 241,875 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 West Tower 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, “West Tower, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/west-tower-f7766245 (data as of October 2, 2026).