Carlstrom Apartments
Multifamily Housing in Seattle, WA · 4225 11TH AVE NE · 98105
At a glance
Carlstrom Apartments is a 27,930-square-foot multifamily housing building at 4225 11TH AVE NE in Seattle, Washington, built in 1964. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 30.0 kBtu/ft² and 4 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 30.0 kBtu/ft² |
| Source EUI | 84.0 kBtu/ft² |
| GHG emissions | 4 tCO₂e |
| GHG intensity | 0.2 kgCO₂e/ft² |
| Electricity | 196,409 kWh |
| Gross floor area | 27,930 sq ft |
| Source record | seattle:20246:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 30.0 kBtu/ft² | 4 tCO₂e | |
| 2024 | — | 31.7 kBtu/ft² | 4 tCO₂e | |
| 2023 | — | 32.5 kBtu/ft² | 4 tCO₂e | |
| 2022 | — | 32.5 kBtu/ft² | 4 tCO₂e | |
| 2021 | — | — | — | |
| 2020 | 76 | -8 | 32.5 kBtu/ft² | 4 tCO₂e |
| 2019 | 84 | +6 | 30.3 kBtu/ft² | 4 tCO₂e |
| 2018 | 78 | -7 | 31.9 kBtu/ft² | 4 tCO₂e |
| 2017 | 85 | +1 | 30.2 kBtu/ft² | 4 tCO₂e |
| 2016 | 84 | +4 | 28.4 kBtu/ft² | 4 tCO₂e |
| 2015 | 80 | 29.6 kBtu/ft² | 4 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
- 4225 11TH AVE NE
- City
- Seattle
- State
- Washington
- ZIP
- 98105
- Coordinates
- 47.65909, -122.31691
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Carlstrom 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. Its site EUI of 30.0 kBtu/ft² is about 14% 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 0.2 kgCO₂e/ft² is about 76% below the group average of 0.7 kgCO₂e/ft².
At 27,930 sq ft, it is about 68% below the average floor area of 86,468 sq ft for those buildings. It was built in 1964, 19 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 Carlstrom Apartments's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Carlstrom Apartments, covering report years 2015–2025. Its ENERGY STAR score went from 80 in 2015 to 76 in 2020 (-4 points); its best year on file was 2017, at 85. Site EUI moved from 29.6 kBtu/ft² (2015) to 30.0 kBtu/ft² (2025), an 1% increase. Reported emissions went from 4 tCO₂e to 4 tCO₂e over the same span (up 1%).
What does a site EUI of 30.0 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. Carlstrom Apartments's 30.0 kBtu/ft² across 27,930 sq ft works out to about 0.8 billion Btu (246 MWh-equivalent) in 2025. Its source EUI of 84.0 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 196,409 kWh of electricity for the year.
Which law requires Carlstrom Apartments to report its energy use?
Carlstrom 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:20246:2025). 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
- Fauntleroy Terrace Condominium· 27,922 sq ft · score 91 (A)
- Taylor Anne Condominium· 27,918 sq ft · score 86 (A)
- Hillree Manor· 27,910 sq ft · score 81 (B)
- Midtown· 27,878 sq ft · score 89 (A)
- Wedgewood Estates (Bldg. B/ Bldg #10)· 27,853 sq ft · score 57 (C)
- Viewmont Apt· 27,852 sq ft · score 87 (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 Carlstrom Apartments's energy grade?
Carlstrom Apartments did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 30.0 kBtu/ft².
How much energy does Carlstrom Apartments use?
Its 2025 site energy-use intensity was 30.0 kBtu/ft² (84.0 kBtu/ft² source) across 27,930 sq ft, including 196,409 kWh of electricity.
What are Carlstrom Apartments's carbon emissions?
Carlstrom Apartments reported 4 tCO₂e of greenhouse-gas emissions (0.2 kgCO₂e/ft²) for 2025.
Where is Carlstrom Apartments?
Carlstrom Apartments is at 4225 11TH AVE NE, in Seattle, Washington 98105. Its coordinates are 47.65909, -122.31691 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Carlstrom Apartments and when was it built?
Carlstrom Apartments has 27,930 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1964 as its year built. It is classed as multifamily housing.
Is Carlstrom 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, “Carlstrom Apartments, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/carlstrom-apartments-c6dca69f (data as of October 2, 2026).