The Westin Building Exchange (Office)
Data Center in Seattle, WA · 2001 6TH AVE · 98121
At a glance
The Westin Building Exchange (Office) is a 429,405-square-foot data center at 2001 6TH AVE in Seattle, Washington, built in 1981. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 718.6 kBtu/ft² and 1,498 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 718.6 kBtu/ft² |
| Source EUI | 2007.8 kBtu/ft² |
| GHG emissions | 1,498 tCO₂e |
| GHG intensity | 4.3 kgCO₂e/ft² |
| Electricity | 73,461,520 kWh |
| Natural gas | 8,512 therms |
| Gross floor area | 429,405 sq ft |
| Source record | seattle:753:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 718.6 kBtu/ft² | 1,498 tCO₂e | |
| 2024 | — | 756.4 kBtu/ft² | 1,571 tCO₂e | |
| 2023 | — | 761.4 kBtu/ft² | 1,579 tCO₂e | |
| 2022 | — | — | 1,565 tCO₂e | |
| 2021 | — | — | — | |
| 2020 | — | 630.8 kBtu/ft² | 1,586 tCO₂e | |
| 2019 | 100 | 609.5 kBtu/ft² | 1,534 tCO₂e | |
| 2018 | — | 624.7 kBtu/ft² | 1,573 tCO₂e | |
| 2017 | — | 637.7 kBtu/ft² | 1,593 tCO₂e | |
| 2016 | 98 | +27 | 639.7 kBtu/ft² | 1,600 tCO₂e |
| 2015 | 71 | 663.4 kBtu/ft² | 1,659 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.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 2001 6TH AVE
- City
- Seattle
- State
- Washington
- ZIP
- 98121
- Coordinates
- 47.61438, -122.33871
Within ~1 km
Nearby benchmarked buildings
- Seattle Convention Centerscore —
Convention Center · 1,842,925 sq ft
- Two Union Squarescore 96
Office · 1,605,578 sq ft
Office · 1,599,394 sq ft
- Day 1 Tower And Spheres (Amazon)score 93
Office · 1,599,230 sq ft
- Russell Investments Centerscore 92
Office · 1,592,914 sq ft
- Onni South Lake Unionscore 77
Multifamily Housing · 1,546,084 sq ft
See also: most efficient in Seattle · biggest emitters
How does The Westin Building Exchange (Office) 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 718.6 kBtu/ft² is about twice the average of 348.3 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 4.3 kgCO₂e/ft² is about twice the group average of 2.2 kgCO₂e/ft².
At 429,405 sq ft, it is about 331% above the average floor area of 99,697 sq ft for those buildings. It was built in 1981, 26 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 The Westin Building Exchange (Office)'s energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for The Westin Building Exchange (Office), covering report years 2015–2025. Its ENERGY STAR score went from 71 in 2015 to 100 in 2019 (+29 points). Site EUI moved from 663.4 kBtu/ft² (2015) to 718.6 kBtu/ft² (2025), an 8% increase. Reported emissions went from 1,659 tCO₂e to 1,498 tCO₂e over the same span (down 10%).
What does a site EUI of 718.6 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. The Westin Building Exchange (Office)'s 718.6 kBtu/ft² across 429,405 sq ft works out to about 308.6 billion Btu (90,433 MWh-equivalent) in 2025. Its source EUI of 2007.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 73,461,520 kWh of electricity and 8,512 therms of natural gas for the year.
Which law requires The Westin Building Exchange (Office) to report its energy use?
The Westin Building Exchange (Office) 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:753:2025). 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
- Centurylink: 3rd Ave 3-D· 208,328 sq ft · EUI 212.6 kBtu/ft²
- WA 120 Lenora - W00A80· 193,500 sq ft · EUI 65.1 kBtu/ft²
- Data Center, 2020 5TH AVE· 82,149 sq ft · EUI 1673.6 kBtu/ft²
- Centurylink: East Co· 80,004 sq ft · EUI 117.1 kBtu/ft²
- Centurylink: Lakeview Main· 56,521 sq ft · EUI 101.5 kBtu/ft²
- Centurylink: Emerson Main· 47,237 sq ft · EUI 120.7 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 The Westin Building Exchange (Office)'s energy grade?
The Westin Building Exchange (Office) did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 718.6 kBtu/ft².
How much energy does The Westin Building Exchange (Office) use?
Its 2025 site energy-use intensity was 718.6 kBtu/ft² (2007.8 kBtu/ft² source) across 429,405 sq ft, including 73,461,520 kWh of electricity and 8,512 therms of natural gas.
What are The Westin Building Exchange (Office)'s carbon emissions?
The Westin Building Exchange (Office) reported 1,498 tCO₂e of greenhouse-gas emissions (4.3 kgCO₂e/ft²) for 2025.
Where is The Westin Building Exchange (Office)?
The Westin Building Exchange (Office) is at 2001 6TH AVE, in Seattle, Washington 98121. Its coordinates are 47.61438, -122.33871 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is The Westin Building Exchange (Office) and when was it built?
The Westin Building Exchange (Office) has 429,405 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1981 as its year built. It is classed as data center.
Is The Westin Building Exchange (Office) 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).
Working with Seattle building benchmarking records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “The Westin Building Exchange (Office), Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/the-westin-building-exchange-office-eb3d2545 (data as of October 2, 2026).