Centurylink: Duwamish Main
Data Center in Seattle, WA · 7000 EAST MARGINAL WAY S · 98108
At a glance
Centurylink: Duwamish Main is a 36,140-square-foot data center at 7000 EAST MARGINAL WAY S in Seattle, Washington, built in 1962. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 105.0 kBtu/ft² and 22 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 105.0 kBtu/ft² |
| Source EUI | 293.9 kBtu/ft² |
| GHG emissions | 22 tCO₂e |
| GHG intensity | 0.6 kgCO₂e/ft² |
| Electricity | 1,128,437 kWh |
| Gross floor area | 36,140 sq ft |
| Source record | seattle:24991:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 105.0 kBtu/ft² | 22 tCO₂e | |
| 2024 | — | 123.2 kBtu/ft² | 25 tCO₂e | |
| 2023 | — | 125.0 kBtu/ft² | 25 tCO₂e | |
| 2022 | — | 122.3 kBtu/ft² | 25 tCO₂e | |
| 2021 | — | 124.8 kBtu/ft² | 25 tCO₂e | |
| 2020 | — | 134.8 kBtu/ft² | 27 tCO₂e | |
| 2019 | — | 140.8 kBtu/ft² | 28 tCO₂e | |
| 2018 | — | 144.7 kBtu/ft² | 29 tCO₂e | |
| 2017 | — | 127.9 kBtu/ft² | 26 tCO₂e | |
| 2016 | — | 134.0 kBtu/ft² | 27 tCO₂e | |
| 2015 | — | 123.0 kBtu/ft² | 25 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
- 7000 EAST MARGINAL WAY S
- City
- Seattle
- State
- Washington
- ZIP
- 98108
- Coordinates
- 47.54089, -122.32323
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Centurylink: Duwamish Main compare with other data center buildings in Seattle?
The latest disclosures cover 13 data center buildings in Seattle, out of 3,871 buildings citywide. Its site EUI of 105.0 kBtu/ft² is about 70% below the average of 348.3 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 0.6 kgCO₂e/ft² is about 72% below the group average of 2.2 kgCO₂e/ft².
At 36,140 sq ft, it is about 64% below the average floor area of 99,697 sq ft for those buildings. It was built in 1962, 7 years later than the group's average year built (1955). Across all 24 jurisdictions BuildingCensus covers, the 267 data center buildings average an ENERGY STAR score of 68 and a site EUI of 504.4 kBtu/ft².
How has Centurylink: Duwamish Main's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Centurylink: Duwamish Main, covering report years 2015–2025. Site EUI moved from 123.0 kBtu/ft² (2015) to 105.0 kBtu/ft² (2025), a 15% decrease. Reported emissions went from 25 tCO₂e to 22 tCO₂e over the same span (down 10%).
What does a site EUI of 105.0 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. Centurylink: Duwamish Main's 105.0 kBtu/ft² across 36,140 sq ft works out to about 3.8 billion Btu (1,112 MWh-equivalent) in 2025. Its source EUI of 293.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,128,437 kWh of electricity for the year.
Which law requires Centurylink: Duwamish Main to report its energy use?
Centurylink: Duwamish Main 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:24991:2025). 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 data center buildings in Seattle
- UW TOWER DATA CENTER· 36,000 sq ft · score 97 (A)
- Centurylink: West Co· 31,332 sq ft · EUI 87.3 kBtu/ft²
- Centurylink: Sunset Co· 30,087 sq ft · EUI 115.7 kBtu/ft²
- Centurylink: Campus Co· 28,586 sq ft · EUI 129.2 kBtu/ft²
- 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 Centurylink: Duwamish Main's energy grade?
Centurylink: Duwamish Main did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 105.0 kBtu/ft².
How much energy does Centurylink: Duwamish Main use?
Its 2025 site energy-use intensity was 105.0 kBtu/ft² (293.9 kBtu/ft² source) across 36,140 sq ft, including 1,128,437 kWh of electricity.
What are Centurylink: Duwamish Main's carbon emissions?
Centurylink: Duwamish Main reported 22 tCO₂e of greenhouse-gas emissions (0.6 kgCO₂e/ft²) for 2025.
Where is Centurylink: Duwamish Main?
Centurylink: Duwamish Main is at 7000 EAST MARGINAL WAY S, in Seattle, Washington 98108. Its coordinates are 47.54089, -122.32323 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Centurylink: Duwamish Main and when was it built?
Centurylink: Duwamish Main has 36,140 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1962 as its year built. It is classed as data center.
Is Centurylink: Duwamish Main 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, “Centurylink: Duwamish Main, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/centurylink-duwamish-main-1616b960 (data as of October 2, 2026).