Centurylink: Sunset Co
Data Center in Seattle, WA · 1138 NW 63RD ST · 98107
At a glance
Centurylink: Sunset Co is a 30,087-square-foot data center at 1138 NW 63RD ST in Seattle, Washington, built in 1942. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 115.7 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 | 115.7 kBtu/ft² |
| Source EUI | 324.1 kBtu/ft² |
| GHG emissions | 22 tCO₂e |
| GHG intensity | 0.7 kgCO₂e/ft² |
| Electricity | 1,077,271 kWh |
| Gross floor area | 30,087 sq ft |
| Source record | seattle:22420:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 115.7 kBtu/ft² | 22 tCO₂e | |
| 2024 | — | 121.0 kBtu/ft² | 21 tCO₂e | |
| 2023 | — | 124.9 kBtu/ft² | 22 tCO₂e | |
| 2022 | — | 128.7 kBtu/ft² | 23 tCO₂e | |
| 2021 | — | 166.0 kBtu/ft² | 29 tCO₂e | |
| 2020 | — | 168.0 kBtu/ft² | 30 tCO₂e | |
| 2019 | — | 163.5 kBtu/ft² | 29 tCO₂e | |
| 2018 | — | 168.0 kBtu/ft² | 30 tCO₂e | |
| 2017 | — | 169.7 kBtu/ft² | 30 tCO₂e | |
| 2016 | — | 172.6 kBtu/ft² | 31 tCO₂e | |
| 2015 | — | 171.1 kBtu/ft² | 30 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
- 1138 NW 63RD ST
- City
- Seattle
- State
- Washington
- ZIP
- 98107
- Coordinates
- 47.67482, -122.37316
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Centurylink: Sunset Co 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 115.7 kBtu/ft² is about 67% 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 0.7 kgCO₂e/ft² is about 69% below the group average of 2.2 kgCO₂e/ft².
At 30,087 sq ft, it is about 70% below the average floor area of 99,697 sq ft for those buildings. It was built in 1942, 13 years earlier 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: Sunset Co's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Centurylink: Sunset Co, covering report years 2015–2025. Site EUI moved from 171.1 kBtu/ft² (2015) to 115.7 kBtu/ft² (2025), a 32% decrease. Reported emissions went from 30 tCO₂e to 22 tCO₂e over the same span (down 28%).
What does a site EUI of 115.7 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: Sunset Co's 115.7 kBtu/ft² across 30,087 sq ft works out to about 3.5 billion Btu (1,020 MWh-equivalent) in 2025. Its source EUI of 324.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,077,271 kWh of electricity for the year.
Which law requires Centurylink: Sunset Co to report its energy use?
Centurylink: Sunset Co 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:22420:2025). 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
Frequently asked questions
What is Centurylink: Sunset Co's energy grade?
Centurylink: Sunset Co did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 115.7 kBtu/ft².
How much energy does Centurylink: Sunset Co use?
Its 2025 site energy-use intensity was 115.7 kBtu/ft² (324.1 kBtu/ft² source) across 30,087 sq ft, including 1,077,271 kWh of electricity.
What are Centurylink: Sunset Co's carbon emissions?
Centurylink: Sunset Co reported 22 tCO₂e of greenhouse-gas emissions (0.7 kgCO₂e/ft²) for 2025.
Where is Centurylink: Sunset Co?
Centurylink: Sunset Co is at 1138 NW 63RD ST, in Seattle, Washington 98107. Its coordinates are 47.67482, -122.37316 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Centurylink: Sunset Co and when was it built?
Centurylink: Sunset Co has 30,087 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1942 as its year built. It is classed as data center.
Is Centurylink: Sunset Co 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: Sunset Co, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/centurylink-sunset-co-e80abccb (data as of October 2, 2026).