Lake Washington Apartments
Multifamily Housing in Seattle, WA · 9061 SEWARD PARK AVE S · 98118
At a glance
Lake Washington Apartments is a 332,900-square-foot multifamily housing building at 9061 SEWARD PARK AVE S in Seattle, Washington, built in 1947. In its 2025 Seattle benchmarking disclosure it reported an ENERGY STAR score of 29 out of 100 (grade D), a site energy-use intensity of 36.6 kBtu/ft² and 70 tCO₂e of greenhouse-gas emissions. That score is higher than 3% 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 | 29 (band D) |
| Site EUI | 36.6 kBtu/ft² |
| Source EUI | 102.6 kBtu/ft² |
| GHG emissions | 70 tCO₂e |
| GHG intensity | 0.2 kgCO₂e/ft² |
| Electricity | 3,573,792 kWh |
| Gross floor area | 332,900 sq ft |
| Source record | seattle:23714:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 29 | +9 | 36.6 kBtu/ft² | 70 tCO₂e |
| 2024 | 20 | -2 | 38.7 kBtu/ft² | 75 tCO₂e |
| 2023 | 22 | +2 | 39.2 kBtu/ft² | 76 tCO₂e |
| 2022 | 20 | 40.8 kBtu/ft² | 79 tCO₂e | |
| 2021 | — | — | — | |
| 2020 | 27 | -2 | 46.9 kBtu/ft² | 76 tCO₂e |
| 2019 | 29 | 46.6 kBtu/ft² | 76 tCO₂e | |
| 2018 | — | 39.7 kBtu/ft² | 77 tCO₂e | |
| 2017 | 11 | -21 | 42.3 kBtu/ft² | 82 tCO₂e |
| 2016 | 32 | -23 | 37.7 kBtu/ft² | 74 tCO₂e |
| 2015 | 55 | 33.0 kBtu/ft² | 64 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
- 9061 SEWARD PARK AVE S
- City
- Seattle
- State
- Washington
- ZIP
- 98118
- Coordinates
- 47.52175, -122.26466
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Lake Washington 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. Lake Washington Apartments's ENERGY STAR score of 29 compares with an average of 83 across the 1,652 that report a score; it scores higher than 3% of them and lower than 97%. Its site EUI of 36.6 kBtu/ft² is roughly in line with the average of 34.9 kBtu/ft². Its emissions intensity of 0.2 kgCO₂e/ft² is about 70% below the group average of 0.7 kgCO₂e/ft².
At 332,900 sq ft, it is about 285% above the average floor area of 86,468 sq ft for those buildings. It was built in 1947, 36 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 Lake Washington Apartments's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Lake Washington Apartments, covering report years 2015–2025. Its ENERGY STAR score went from 55 in 2015 to 29 in 2025 (-26 points); its best year on file was 2015, at 55. Site EUI moved from 33.0 kBtu/ft² (2015) to 36.6 kBtu/ft² (2025), an 11% increase. Reported emissions went from 64 tCO₂e to 70 tCO₂e over the same span (up 10%).
What does an ENERGY STAR score of 29 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: a score of 29 means the building performs better than about 29% of its national peers. BuildingCensus bands the score into report-card grades; 29 falls in band D — lowest band (1–54). It sits 46 points below 75, the threshold for ENERGY STAR certification. 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. Lake Washington Apartments's 36.6 kBtu/ft² across 332,900 sq ft works out to about 12.2 billion Btu (3,571 MWh-equivalent) in 2025. Its source EUI of 102.6 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 3,573,792 kWh of electricity for the year.
Which law requires Lake Washington Apartments to report its energy use?
Lake Washington 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:23714:2025). 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
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- All Seattle benchmarked buildings· Seattle Energy Benchmarking Ordinance (SMC 22.920)
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Frequently asked questions
What is Lake Washington Apartments's energy grade?
Lake Washington Apartments scores 29 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2025 Seattle disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Lake Washington Apartments use?
Its 2025 site energy-use intensity was 36.6 kBtu/ft² (102.6 kBtu/ft² source) across 332,900 sq ft, including 3,573,792 kWh of electricity.
What are Lake Washington Apartments's carbon emissions?
Lake Washington Apartments reported 70 tCO₂e of greenhouse-gas emissions (0.2 kgCO₂e/ft²) for 2025.
Where is Lake Washington Apartments?
Lake Washington Apartments is at 9061 SEWARD PARK AVE S, in Seattle, Washington 98118. Its coordinates are 47.52175, -122.26466 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Lake Washington Apartments and when was it built?
Lake Washington Apartments has 332,900 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1947 as its year built. It is classed as multifamily housing.
Is Lake Washington 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, “Lake Washington Apartments, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/lake-washington-apartments-92a74d5f (data as of October 2, 2026).