Summerstone (East & West Bldgs)
Multifamily Housing in Seattle, WA · 5230 39TH AVE S · 98118
At a glance
Summerstone (East & West Bldgs) is a 56,853-square-foot multifamily housing building at 5230 39TH AVE S in Seattle, Washington, built in 2022. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 63.1 kBtu/ft² and 42 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 63.1 kBtu/ft² |
| Source EUI | 116.5 kBtu/ft² |
| GHG emissions | 42 tCO₂e |
| GHG intensity | 2.0 kgCO₂e/ft² |
| Electricity | 176,830 kWh |
| Natural gas | 7,233 therms |
| Gross floor area | 56,853 sq ft |
| Source record | seattle:50951:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 63.1 kBtu/ft² | 42 tCO₂e | |
| 2024 | — | 38.2 kBtu/ft² | 23 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
- 5230 39TH AVE S
- City
- Seattle
- State
- Washington
- ZIP
- 98118
- Coordinates
- 47.55477, -122.28306
Within ~1 km
Nearby benchmarked buildings
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- Greenhouse Apartments (2013)score 96
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- Alta Arlo Westscore 92
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- Filipino Community Villagescore 100
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See also: most efficient in Seattle · biggest emitters
How does Summerstone (East & West Bldgs) 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. Its site EUI of 63.1 kBtu/ft² is about 81% above the average of 34.9 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 2.0 kgCO₂e/ft² is about 184% above the group average of 0.7 kgCO₂e/ft².
At 56,853 sq ft, it is about 34% below the average floor area of 86,468 sq ft for those buildings. It was built in 2022, 39 years later 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 Summerstone (East & West Bldgs)'s energy performance changed over time?
BuildingCensus holds 2 Seattle disclosures for Summerstone (East & West Bldgs), covering report years 2024–2025. Site EUI moved from 38.2 kBtu/ft² (2024) to 63.1 kBtu/ft² (2025), an 65% increase. Reported emissions went from 23 tCO₂e to 42 tCO₂e over the same span (up 80%).
What does a site EUI of 63.1 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. Summerstone (East & West Bldgs)'s 63.1 kBtu/ft² across 56,853 sq ft works out to about 3.6 billion Btu (1,051 MWh-equivalent) in 2025. Its source EUI of 116.5 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 176,830 kWh of electricity and 7,233 therms of natural gas for the year.
Which law requires Summerstone (East & West Bldgs) to report its energy use?
Summerstone (East & West Bldgs) 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:50951:2025). 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
- Meridian Place (Bldgs C & D)· 56,800 sq ft · score 75 (B)
- Sanford Hildebrandt Towers Ii· 56,800 sq ft · score 50 (D)
- Oregon Apartments· 56,776 sq ft · score 90 (A)
- Mcdermontt Place (Lake City Court)· 56,745 sq ft · score 64 (C)
- Carolina Court· 56,652 sq ft · score 100 (A)
- Lake Union Terrace· 56,649 sq ft · score 100 (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 Summerstone (East & West Bldgs)'s energy grade?
Summerstone (East & West Bldgs) did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 63.1 kBtu/ft².
How much energy does Summerstone (East & West Bldgs) use?
Its 2025 site energy-use intensity was 63.1 kBtu/ft² (116.5 kBtu/ft² source) across 56,853 sq ft, including 176,830 kWh of electricity and 7,233 therms of natural gas.
What are Summerstone (East & West Bldgs)'s carbon emissions?
Summerstone (East & West Bldgs) reported 42 tCO₂e of greenhouse-gas emissions (2.0 kgCO₂e/ft²) for 2025.
Where is Summerstone (East & West Bldgs)?
Summerstone (East & West Bldgs) is at 5230 39TH AVE S, in Seattle, Washington 98118. Its coordinates are 47.55477, -122.28306 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Summerstone (East & West Bldgs) and when was it built?
Summerstone (East & West Bldgs) has 56,853 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2022 as its year built. It is classed as multifamily housing.
Is Summerstone (East & West Bldgs) 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, “Summerstone (East & West Bldgs), Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/summerstone-east-west-bldgs-24925e8a (data as of October 2, 2026).