At a glance
Key Bank (International Building) is a 35,202-square-foot office building at 666 S DEARBORN ST in Seattle, Washington, built in 1979. In its 2025 Seattle benchmarking disclosure it reported an ENERGY STAR score of 100 out of 100 (grade A), a site energy-use intensity of 3.2 kBtu/ft² and 1 tCO₂e of greenhouse-gas emissions. That score is higher than 96% 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 | 100 (band A) |
| Site EUI | 3.2 kBtu/ft² |
| Source EUI | 8.9 kBtu/ft² |
| GHG emissions | 1 tCO₂e |
| GHG intensity | 0.0 kgCO₂e/ft² |
| Electricity | 32,668 kWh |
| Gross floor area | 35,202 sq ft |
| Source record | seattle:25713:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 100 | ±0 | 3.2 kBtu/ft² | 1 tCO₂e |
| 2024 | 100 | +16 | 12.3 kBtu/ft² | 3 tCO₂e |
| 2023 | 84 | +49 | 30.8 kBtu/ft² | 6 tCO₂e |
| 2022 | 35 | +30 | 63.3 kBtu/ft² | 13 tCO₂e |
| 2021 | 5 | +4 | 110.3 kBtu/ft² | 23 tCO₂e |
| 2020 | 1 | -1 | 149.0 kBtu/ft² | 29 tCO₂e |
| 2019 | 2 | ±0 | 98.8 kBtu/ft² | 19 tCO₂e |
| 2018 | 2 | +1 | 101.1 kBtu/ft² | 20 tCO₂e |
| 2017 | 1 | -1 | 114.8 kBtu/ft² | 22 tCO₂e |
| 2016 | 2 | -1 | 108.1 kBtu/ft² | 21 tCO₂e |
| 2015 | 3 | 98.8 kBtu/ft² | 19 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
- 666 S DEARBORN ST
- City
- Seattle
- State
- Washington
- ZIP
- 98134
- Coordinates
- 47.59644, -122.32415
Within ~1 km
Nearby benchmarked buildings
Hospital (General Medical & Surgical) · 1,926,841 sq ft
- Centurylink Field-Stadiumscore —
Stadium (Open) · 1,913,640 sq ft
Parking · 872,409 sq ft
- Embassy Suites- Downtown Seattlescore 91
Mixed Use Property · 680,770 sq ft
- King County Courthousescore 56
Courthouse · 540,360 sq ft
Office · 446,261 sq ft
See also: most efficient in Seattle · biggest emitters
How does Key Bank (International Building) compare with other office buildings in Seattle?
The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. Key Bank (International Building)'s ENERGY STAR score of 100 compares with an average of 76 across the 378 that report a score; it scores higher than 96% of them. Its site EUI of 3.2 kBtu/ft² is about 93% 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 0.0 kgCO₂e/ft² is about 97% below the group average of 0.7 kgCO₂e/ft².
At 35,202 sq ft, it is about 82% below the average floor area of 196,452 sq ft for those buildings. It was built in 1979, 14 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 Key Bank (International Building)'s energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Key Bank (International Building), covering report years 2015–2025. Its ENERGY STAR score went from 3 in 2015 to 100 in 2025 (+97 points); its best year on file was 2024, at 100. Site EUI moved from 98.8 kBtu/ft² (2015) to 3.2 kBtu/ft² (2025), a 97% decrease. Reported emissions went from 19 tCO₂e to 1 tCO₂e over the same span (down 97%).
What does an ENERGY STAR score of 100 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: 100 is the top of the scale. BuildingCensus bands the score into report-card grades; 100 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. Key Bank (International Building)'s 3.2 kBtu/ft² across 35,202 sq ft works out to about 0.1 billion Btu (33 MWh-equivalent) in 2025. Its source EUI of 8.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 32,668 kWh of electricity for the year.
Which law requires Key Bank (International Building) to report its energy use?
Key Bank (International 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:25713:2025). 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
- Westlake Place· 35,200 sq ft · score 75 (B)
- PACIFIC GEORGETOWN CENTER LLC· 35,017 sq ft
- Canal Pl Office Park· 34,545 sq ft · score 81 (B)
- The Hart Ford· 34,110 sq ft · score 68 (C)
- Canal Pl Office Park· 34,106 sq ft · score 29 (D)
- Diamond Building· 34,030 sq ft · score 39 (D)
- 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 Key Bank (International Building)'s energy grade?
Key Bank (International Building) scores 100 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 Key Bank (International Building) use?
Its 2025 site energy-use intensity was 3.2 kBtu/ft² (8.9 kBtu/ft² source) across 35,202 sq ft, including 32,668 kWh of electricity.
What are Key Bank (International Building)'s carbon emissions?
Key Bank (International Building) reported 1 tCO₂e of greenhouse-gas emissions (0.0 kgCO₂e/ft²) for 2025.
Where is Key Bank (International Building)?
Key Bank (International Building) is at 666 S DEARBORN ST, in Seattle, Washington 98134. Its coordinates are 47.59644, -122.32415 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Key Bank (International Building) and when was it built?
Key Bank (International Building) has 35,202 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1979 as its year built. It is classed as office.
Is Key Bank (International 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, “Key Bank (International Building), Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/key-bank-international-building-331e9725 (data as of October 2, 2026).