Westminster Apartments
Multifamily Housing in Seattle, WA · 903 9TH AVE · 98104
At a glance
Westminster Apartments is a 33,872-square-foot multifamily housing building at 903 9TH AVE in Seattle, Washington, built in 1906. In its 2025 Seattle benchmarking disclosure it reported an ENERGY STAR score of 100 out of 100 (grade A), a site energy-use intensity of 3.4 kBtu/ft² and 3 tCO₂e of greenhouse-gas emissions. That score is higher than 88% 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 | 100 (band A) |
| Site EUI | 3.4 kBtu/ft² |
| Source EUI | 6.2 kBtu/ft² |
| GHG emissions | 3 tCO₂e |
| GHG intensity | 0.1 kgCO₂e/ft² |
| Electricity | 11,402 kWh |
| Natural gas | 496 therms |
| Gross floor area | 33,872 sq ft |
| Source record | seattle:23295:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 100 | ±0 | 3.4 kBtu/ft² | 3 tCO₂e |
| 2024 | 100 | ±0 | 3.2 kBtu/ft² | 3 tCO₂e |
| 2023 | 100 | ±0 | 3.4 kBtu/ft² | 3 tCO₂e |
| 2022 | 100 | ±0 | 9.2 kBtu/ft² | 4 tCO₂e |
| 2021 | 100 | ±0 | 13.4 kBtu/ft² | 5 tCO₂e |
| 2020 | 100 | ±0 | 13.6 kBtu/ft² | 4 tCO₂e |
| 2019 | 100 | ±0 | 12.3 kBtu/ft² | 4 tCO₂e |
| 2018 | 100 | ±0 | 13.3 kBtu/ft² | 5 tCO₂e |
| 2017 | 100 | ±0 | 14.0 kBtu/ft² | 5 tCO₂e |
| 2016 | 100 | ±0 | 15.3 kBtu/ft² | 5 tCO₂e |
| 2015 | 100 | 15.2 kBtu/ft² | 5 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
- 903 9TH AVE
- City
- Seattle
- State
- Washington
- ZIP
- 98104
- Coordinates
- 47.60771, -122.32717
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Westminster Apartments 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. Westminster Apartments's ENERGY STAR score of 100 compares with an average of 83 across the 1,652 that report a score; it scores higher than 88% of them. Its site EUI of 3.4 kBtu/ft² is about 90% below the average of 34.9 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 84% below the group average of 0.7 kgCO₂e/ft².
At 33,872 sq ft, it is about 61% below the average floor area of 86,468 sq ft for those buildings. It was built in 1906, 77 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 Westminster Apartments's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Westminster Apartments, covering report years 2015–2025. Its ENERGY STAR score was 100 in both 2015 and 2025. Site EUI moved from 15.2 kBtu/ft² (2015) to 3.4 kBtu/ft² (2025), a 78% decrease. Reported emissions went from 5 tCO₂e to 3 tCO₂e over the same span (down 45%).
What does an ENERGY STAR score of 100 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: 100 is the top of the scale. BuildingCensus bands the score into report-card grades; 100 falls in band A — high performer (85–100). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. 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. Westminster Apartments's 3.4 kBtu/ft² across 33,872 sq ft works out to about 0.1 billion Btu (34 MWh-equivalent) in 2025. Its source EUI of 6.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 11,402 kWh of electricity and 496 therms of natural gas for the year.
Which law requires Westminster Apartments to report its energy use?
Westminster Apartments 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:23295:2025). 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
- Highland Terrace Condominium· 33,852 sq ft · score 83 (B)
- King County- Queen Anne Housing· 33,744 sq ft · score 100 (A)
- Roycroft Apts· 33,736 sq ft · score 79 (B)
- Crown Ridge Apartments· 33,733 sq ft · score 99 (A)
- Knights Of Columbus Bldg· 33,708 sq ft · score 100 (A)
- Summit View· 33,692 sq ft · score 95 (A)
- 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 Westminster Apartments's energy grade?
Westminster Apartments scores 100 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2025 Seattle disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Westminster Apartments use?
Its 2025 site energy-use intensity was 3.4 kBtu/ft² (6.2 kBtu/ft² source) across 33,872 sq ft, including 11,402 kWh of electricity and 496 therms of natural gas.
What are Westminster Apartments's carbon emissions?
Westminster Apartments reported 3 tCO₂e of greenhouse-gas emissions (0.1 kgCO₂e/ft²) for 2025.
Where is Westminster Apartments?
Westminster Apartments is at 903 9TH AVE, in Seattle, Washington 98104. Its coordinates are 47.60771, -122.32717 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Westminster Apartments and when was it built?
Westminster Apartments has 33,872 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1906 as its year built. It is classed as multifamily housing.
Is Westminster Apartments 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, “Westminster Apartments, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/westminster-apartments-950224a6 (data as of October 2, 2026).