At a glance
Mox Building is a 23,500-square-foot office building at 5105 LEARY AVE NW in Seattle, Washington, built in 1968. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 35.7 kBtu/ft² and 26 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 35.7 kBtu/ft² |
| Source EUI | 65.7 kBtu/ft² |
| GHG emissions | 26 tCO₂e |
| GHG intensity | 1.1 kgCO₂e/ft² |
| Electricity | 110,907 kWh |
| Natural gas | 4,625 therms |
| Gross floor area | 23,500 sq ft |
| Source record | seattle:22676:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 35.7 kBtu/ft² | 26 tCO₂e | |
| 2024 | — | 37.8 kBtu/ft² | 27 tCO₂e | |
| 2023 | — | 44.5 kBtu/ft² | 26 tCO₂e | |
| 2022 | — | 46.9 kBtu/ft² | 27 tCO₂e | |
| 2021 | — | 38.5 kBtu/ft² | 20 tCO₂e | |
| 2020 | — | 33.5 kBtu/ft² | 19 tCO₂e | |
| 2019 | — | 25.5 kBtu/ft² | 29 tCO₂e | |
| 2018 | 20 | -7 | 71.1 kBtu/ft² | 34 tCO₂e |
| 2017 | 27 | +1 | 77.0 kBtu/ft² | 39 tCO₂e |
| 2016 | 26 | -2 | 71.8 kBtu/ft² | 33 tCO₂e |
| 2015 | 28 | 69.9 kBtu/ft² | 32 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
- 5105 LEARY AVE NW
- City
- Seattle
- State
- Washington
- ZIP
- 98107
- Coordinates
- 47.66497, -122.38047
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Mox Building compare with other office buildings in Seattle?
The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. Its site EUI of 35.7 kBtu/ft² is about 20% 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 1.1 kgCO₂e/ft² is about 56% above the group average of 0.7 kgCO₂e/ft².
At 23,500 sq ft, it is about 88% below the average floor area of 196,452 sq ft for those buildings. It was built in 1968, 3 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 Mox Building's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Mox Building, covering report years 2015–2025. Its ENERGY STAR score went from 28 in 2015 to 20 in 2018 (-8 points); its best year on file was 2015, at 28. Site EUI moved from 69.9 kBtu/ft² (2015) to 35.7 kBtu/ft² (2025), a 49% decrease. Reported emissions went from 32 tCO₂e to 26 tCO₂e over the same span (down 19%).
What does a site EUI of 35.7 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. Mox Building's 35.7 kBtu/ft² across 23,500 sq ft works out to about 0.8 billion Btu (246 MWh-equivalent) in 2025. Its source EUI of 65.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 110,907 kWh of electricity and 4,625 therms of natural gas for the year.
Which law requires Mox Building to report its energy use?
Mox 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:22676:2025). 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
- ENG SUEY SUN PLAZA- DEMOLISHED DUE TO FIRE· 23,472 sq ft
- Elysian Brewing Co & Offices· 23,422 sq ft
- Office / Marina· 23,355 sq ft · score 66 (C)
- EJ&J· 23,250 sq ft · EUI 62.6 kBtu/ft²
- Sanborn Building· 23,032 sq ft · EUI 34.0 kBtu/ft²
- Collection Agency Office· 22,866 sq ft · EUI 37.4 kBtu/ft²
- 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 Mox Building's energy grade?
Mox Building did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 35.7 kBtu/ft².
How much energy does Mox Building use?
Its 2025 site energy-use intensity was 35.7 kBtu/ft² (65.7 kBtu/ft² source) across 23,500 sq ft, including 110,907 kWh of electricity and 4,625 therms of natural gas.
What are Mox Building's carbon emissions?
Mox Building reported 26 tCO₂e of greenhouse-gas emissions (1.1 kgCO₂e/ft²) for 2025.
Where is Mox Building?
Mox Building is at 5105 LEARY AVE NW, in Seattle, Washington 98107. Its coordinates are 47.66497, -122.38047 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Mox Building and when was it built?
Mox Building has 23,500 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1968 as its year built. It is classed as office.
Is Mox 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, “Mox Building, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/mox-building-cb477b8d (data as of October 2, 2026).