The Juno Building
Laboratory in Seattle, WA · 400 DEXTER AVE N · 98109
At a glance
The Juno Building is a 443,118-square-foot laboratory building at 400 DEXTER AVE N in Seattle, Washington, built in 2017. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 169.7 kBtu/ft² and 1,183 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 169.7 kBtu/ft² |
| Source EUI | 360.1 kBtu/ft² |
| GHG emissions | 1,183 tCO₂e |
| GHG intensity | 3.9 kgCO₂e/ft² |
| Electricity | 9,186,008 kWh |
| Natural gas | 198,452 therms |
| Gross floor area | 443,118 sq ft |
| Source record | seattle:50298:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 169.7 kBtu/ft² | 1,183 tCO₂e | |
| 2024 | — | 186.9 kBtu/ft² | 1,486 tCO₂e | |
| 2023 | — | 161.8 kBtu/ft² | 1,213 tCO₂e | |
| 2022 | 21 | -6 | 155.3 kBtu/ft² | 1,113 tCO₂e |
| 2021 | 27 | -3 | 154.2 kBtu/ft² | 1,170 tCO₂e |
| 2020 | 30 | -8 | 147.0 kBtu/ft² | 1,136 tCO₂e |
| 2019 | 38 | -10 | 139.5 kBtu/ft² | 1,034 tCO₂e |
| 2018 | 48 | 121.3 kBtu/ft² | 856 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
- 400 DEXTER AVE N
- City
- Seattle
- State
- Washington
- ZIP
- 98109
- Coordinates
- 47.62231, -122.34194
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does The Juno Building compare with other laboratory buildings in Seattle?
The latest disclosures cover 32 laboratory buildings in Seattle, out of 3,871 buildings citywide. Its site EUI of 169.7 kBtu/ft² is roughly in line with the average of 178.6 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 3.9 kgCO₂e/ft² is about 15% below the group average of 4.6 kgCO₂e/ft².
At 443,118 sq ft, it is about twice the average floor area of 202,547 sq ft for those buildings. It was built in 2017, 31 years later than the group's average year built (1986). Across all 24 jurisdictions BuildingCensus covers, the 795 laboratory buildings average an ENERGY STAR score of 29 and a site EUI of 231.7 kBtu/ft².
How has The Juno Building's energy performance changed over time?
BuildingCensus holds 8 Seattle disclosures for The Juno Building, covering report years 2018–2025. Its ENERGY STAR score went from 48 in 2018 to 21 in 2022 (-27 points); its best year on file was 2018, at 48. Site EUI moved from 121.3 kBtu/ft² (2018) to 169.7 kBtu/ft² (2025), an 40% increase. Reported emissions went from 856 tCO₂e to 1,183 tCO₂e over the same span (up 38%).
What does a site EUI of 169.7 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. The Juno Building's 169.7 kBtu/ft² across 443,118 sq ft works out to about 75.2 billion Btu (22,038 MWh-equivalent) in 2025. Its source EUI of 360.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 9,186,008 kWh of electricity and 198,452 therms of natural gas for the year.
Which law requires The Juno Building to report its energy use?
The Juno 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:50298:2025). 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 laboratory buildings in Seattle
- Allen Institute For Brain Science (Aibs)· 345,290 sq ft · EUI 145.8 kBtu/ft²
- UW Medicine Phase 3· 339,591 sq ft · EUI 200.3 kBtu/ft²
- 188 East Blaine· 310,584 sq ft · EUI 158.9 kBtu/ft²
- Seattle Children's Hospital (Jack R Mcdonald Building)· 299,070 sq ft · EUI 234.1 kBtu/ft²
- 1616 Eastlake Building· 281,306 sq ft · EUI 233.5 kBtu/ft²
- 401 Terry Ave (Institute For System Biology)· 258,505 sq ft · EUI 229.5 kBtu/ft²
- Laboratory buildings in Seattle· 32 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 The Juno Building's energy grade?
The Juno Building did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 169.7 kBtu/ft².
How much energy does The Juno Building use?
Its 2025 site energy-use intensity was 169.7 kBtu/ft² (360.1 kBtu/ft² source) across 443,118 sq ft, including 9,186,008 kWh of electricity and 198,452 therms of natural gas.
What are The Juno Building's carbon emissions?
The Juno Building reported 1,183 tCO₂e of greenhouse-gas emissions (3.9 kgCO₂e/ft²) for 2025.
Where is The Juno Building?
The Juno Building is at 400 DEXTER AVE N, in Seattle, Washington 98109. Its coordinates are 47.62231, -122.34194 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is The Juno Building and when was it built?
The Juno Building has 443,118 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2017 as its year built. It is classed as laboratory.
Is The Juno 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, “The Juno Building, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/the-juno-building-317ff81c (data as of October 2, 2026).