At a glance
101 STEWART is a 115,857-square-foot office building at 101 STEWART ST in Seattle, Washington, built in 1986. In its 2024 Seattle benchmarking disclosure it reported an ENERGY STAR score of 79 out of 100 (grade B), a site energy-use intensity of 34.4 kBtu/ft² and 20 tCO₂e of greenhouse-gas emissions. That score is higher than 40% of the 378 scored office buildings in Seattle.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 79 (band B) |
| Site EUI | 34.4 kBtu/ft² |
| Source EUI | 96.4 kBtu/ft² |
| GHG emissions | 20 tCO₂e |
| GHG intensity | 0.2 kgCO₂e/ft² |
| Electricity | 988,934 kWh |
| Gross floor area | 115,857 sq ft |
| Source record | seattle:425:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 79 | -3 | 34.4 kBtu/ft² | 20 tCO₂e |
| 2023 | 82 | -13 | 35.4 kBtu/ft² | 20 tCO₂e |
| 2022 | 95 | +10 | 23.6 kBtu/ft² | 13 tCO₂e |
| 2021 | 85 | +3 | 33.1 kBtu/ft² | 19 tCO₂e |
| 2020 | 82 | -1 | 41.6 kBtu/ft² | 24 tCO₂e |
| 2019 | 83 | -1 | 48.7 kBtu/ft² | 28 tCO₂e |
| 2018 | 84 | +5 | 47.7 kBtu/ft² | 28 tCO₂e |
| 2017 | 79 | -10 | 47.5 kBtu/ft² | 29 tCO₂e |
| 2016 | 89 | +15 | 45.2 kBtu/ft² | 28 tCO₂e |
| 2015 | 74 | 52.6 kBtu/ft² | 32 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
- 101 STEWART ST
- City
- Seattle
- State
- Washington
- ZIP
- 98101
- Coordinates
- 47.61029, -122.34089
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does 101 STEWART compare with other office buildings in Seattle?
The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. 101 STEWART's ENERGY STAR score of 79 compares with an average of 76 across the 378 that report a score; it scores higher than 40% of them and lower than 58%. Its site EUI of 34.4 kBtu/ft² is about 23% below 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 0.2 kgCO₂e/ft² is about 71% below the group average of 0.7 kgCO₂e/ft².
At 115,857 sq ft, it is about 41% below the average floor area of 196,452 sq ft for those buildings. It was built in 1986, 21 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 101 STEWART's energy performance changed over time?
BuildingCensus holds 10 Seattle disclosures for 101 STEWART, covering report years 2015–2024. Its ENERGY STAR score went from 74 in 2015 to 79 in 2024 (+5 points); its best year on file was 2022, at 95. Site EUI moved from 52.6 kBtu/ft² (2015) to 34.4 kBtu/ft² (2024), a 35% decrease. Reported emissions went from 32 tCO₂e to 20 tCO₂e over the same span (down 39%).
What does an ENERGY STAR score of 79 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 79 means the building performs better than about 79% of its national peers. BuildingCensus bands the score into report-card grades; 79 falls in band B — above median (70–84). 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. 101 STEWART's 34.4 kBtu/ft² across 115,857 sq ft works out to about 4 billion Btu (1,168 MWh-equivalent) in 2024. Its source EUI of 96.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 988,934 kWh of electricity for the year.
Which law requires 101 STEWART to report its energy use?
101 STEWART 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 2024 disclosure (source record seattle:425:2024). 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
- Yesler Building - King County· 114,395 sq ft · score 81 (B)
- 4545 15th Ave Ne· 113,944 sq ft · score 1 (D)
- Polson Building· 112,560 sq ft · score 94 (A)
- Interbay Work Lofts· 111,750 sq ft · score 100 (A)
- Wafd Bank· 109,830 sq ft · score 73 (B)
- Joshua Green Building· 109,266 sq ft · score 77 (B)
- 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 101 STEWART's energy grade?
101 STEWART scores 79 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2024 Seattle disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 101 STEWART use?
Its 2024 site energy-use intensity was 34.4 kBtu/ft² (96.4 kBtu/ft² source) across 115,857 sq ft, including 988,934 kWh of electricity.
What are 101 STEWART's carbon emissions?
101 STEWART reported 20 tCO₂e of greenhouse-gas emissions (0.2 kgCO₂e/ft²) for 2024.
Where is 101 STEWART?
101 STEWART is at 101 STEWART ST, in Seattle, Washington 98101. Its coordinates are 47.61029, -122.34089 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is 101 STEWART and when was it built?
101 STEWART has 115,857 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1986 as its year built. It is classed as office.
Is 101 STEWART covered by the Seattle Energy Benchmarking Ordinance (SMC 22.920)?
Yes — it appears in the 2024 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, “101 STEWART, Seattle, Washington — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/101-stewart-faf774ee (data as of October 2, 2026).