At a glance
6100 Building is a 238,148-square-foot office building at 6100 4TH AVE S in Seattle, Washington, built in 1975. In its 2025 Seattle benchmarking disclosure it reported an ENERGY STAR score of 94 out of 100 (grade A), a site energy-use intensity of 21.2 kBtu/ft² and 31 tCO₂e of greenhouse-gas emissions. That score is higher than 81% of the 378 scored office buildings in Seattle.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 94 (band A) |
| Site EUI | 21.2 kBtu/ft² |
| Source EUI | 59.3 kBtu/ft² |
| GHG emissions | 31 tCO₂e |
| GHG intensity | 0.1 kgCO₂e/ft² |
| Electricity | 1,530,022 kWh |
| Natural gas | 145 therms |
| Gross floor area | 238,148 sq ft |
| Source record | seattle:796:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 94 | +11 | 21.2 kBtu/ft² | 31 tCO₂e |
| 2024 | 83 | -1 | 29.9 kBtu/ft² | 44 tCO₂e |
| 2023 | 84 | -4 | 30.0 kBtu/ft² | 44 tCO₂e |
| 2022 | 88 | -6 | 26.9 kBtu/ft² | 39 tCO₂e |
| 2021 | 94 | ±0 | 28.2 kBtu/ft² | 40 tCO₂e |
| 2020 | 94 | +7 | 29.3 kBtu/ft² | 42 tCO₂e |
| 2019 | 87 | +5 | 41.2 kBtu/ft² | 59 tCO₂e |
| 2018 | 82 | -12 | 48.1 kBtu/ft² | 68 tCO₂e |
| 2017 | 94 | +1 | 43.5 kBtu/ft² | 62 tCO₂e |
| 2016 | 93 | +66 | 43.9 kBtu/ft² | 63 tCO₂e |
| 2015 | 27 | 47.7 kBtu/ft² | 66 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
- 6100 4TH AVE S
- City
- Seattle
- State
- Washington
- ZIP
- 98108
- Coordinates
- 47.54699, -122.32882
Within ~1 km
Nearby benchmarked buildings
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- Bldg C Nw Corp Parkscore 72
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- Gte Sylvaniascore 77
Non-Refrigerated Warehouse · 106,000 sq ft
See also: most efficient in Seattle · biggest emitters
How does 6100 Building compare with other office buildings in Seattle?
The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. 6100 Building's ENERGY STAR score of 94 compares with an average of 76 across the 378 that report a score; it scores higher than 81% of them and lower than 16%. Its site EUI of 21.2 kBtu/ft² is about half of 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 0.1 kgCO₂e/ft² is about 81% below the group average of 0.7 kgCO₂e/ft².
At 238,148 sq ft, it is about 21% above the average floor area of 196,452 sq ft for those buildings. It was built in 1975, 10 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 6100 Building's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for 6100 Building, covering report years 2015–2025. Its ENERGY STAR score went from 27 in 2015 to 94 in 2025 (+67 points); its best year on file was 2017, at 94. Site EUI moved from 47.7 kBtu/ft² (2015) to 21.2 kBtu/ft² (2025), a 56% decrease. Reported emissions went from 66 tCO₂e to 31 tCO₂e over the same span (down 53%).
What does an ENERGY STAR score of 94 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 94 means the building performs better than about 94% of its national peers. BuildingCensus bands the score into report-card grades; 94 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. 6100 Building's 21.2 kBtu/ft² across 238,148 sq ft works out to about 5 billion Btu (1,480 MWh-equivalent) in 2025. Its source EUI of 59.3 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,530,022 kWh of electricity and 145 therms of natural gas for the year.
Which law requires 6100 Building to report its energy use?
6100 Building 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:796:2025). 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
- Fourth & Battery Building· 234,000 sq ft · score 83 (B)
- 1015 2nd Avenue Bldg· 232,045 sq ft · EUI 22.6 kBtu/ft²
- 202 Westlake· 231,510 sq ft · score 85 (A)
- 1100 Dexter· 228,460 sq ft · score 88 (A)
- Pacific Building· 227,556 sq ft · score 91 (A)
- Fhcrc - Yale Bldg· 226,592 sq ft · score 56 (C)
- 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 6100 Building's energy grade?
6100 Building scores 94 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 6100 Building use?
Its 2025 site energy-use intensity was 21.2 kBtu/ft² (59.3 kBtu/ft² source) across 238,148 sq ft, including 1,530,022 kWh of electricity and 145 therms of natural gas.
What are 6100 Building's carbon emissions?
6100 Building reported 31 tCO₂e of greenhouse-gas emissions (0.1 kgCO₂e/ft²) for 2025.
Where is 6100 Building?
6100 Building is at 6100 4TH AVE S, in Seattle, Washington 98108. Its coordinates are 47.54699, -122.32882 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is 6100 Building and when was it built?
6100 Building has 238,148 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1975 as its year built. It is classed as office.
Is 6100 Building 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, “6100 Building, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/6100-building-8fd32ada (data as of October 2, 2026).