Komo Plaza East & West Buildings
Mixed Use Property in Seattle, WA · 100 4TH AVE N · 98109
At a glance
Komo Plaza East & West Buildings is a 524,610-square-foot mixed use property building at 100 4TH AVE N in Seattle, Washington, built in 2001. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 300.8 kBtu/ft² and 815 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 300.8 kBtu/ft² |
| Source EUI | 840.0 kBtu/ft² |
| GHG emissions | 815 tCO₂e |
| GHG intensity | 1.8 kgCO₂e/ft² |
| Electricity | 39,768,008 kWh |
| Natural gas | 5,480 therms |
| Gross floor area | 524,610 sq ft |
| Source record | seattle:50376:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 300.8 kBtu/ft² | 815 tCO₂e | |
| 2024 | — | 324.7 kBtu/ft² | 882 tCO₂e | |
| 2023 | — | 313.0 kBtu/ft² | 844 tCO₂e | |
| 2022 | — | 300.1 kBtu/ft² | 811 tCO₂e | |
| 2021 | — | 297.1 kBtu/ft² | 801 tCO₂e | |
| 2020 | — | 358.9 kBtu/ft² | 771 tCO₂e | |
| 2019 | — | 342.6 kBtu/ft² | 751 tCO₂e | |
| 2018 | — | 317.2 kBtu/ft² | 702 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
- 100 4TH AVE N
- City
- Seattle
- State
- Washington
- ZIP
- 98109
- Coordinates
- 47.61915, -122.34857
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Komo Plaza East & West Buildings compare with other mixed use property buildings in Seattle?
The latest disclosures cover 157 mixed use property buildings in Seattle, out of 3,871 buildings citywide. Its site EUI of 300.8 kBtu/ft² is about 338% above the average of 68.7 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 1.8 kgCO₂e/ft² is about 29% above the group average of 1.4 kgCO₂e/ft².
At 524,610 sq ft, it is about 217% above the average floor area of 165,352 sq ft for those buildings. It was built in 2001, 33 years later than the group's average year built (1968). Across all 24 jurisdictions BuildingCensus covers, the 1,212 mixed use property buildings average an ENERGY STAR score of 69 and a site EUI of 79.8 kBtu/ft².
How has Komo Plaza East & West Buildings's energy performance changed over time?
BuildingCensus holds 8 Seattle disclosures for Komo Plaza East & West Buildings, covering report years 2018–2025. Site EUI moved from 317.2 kBtu/ft² (2018) to 300.8 kBtu/ft² (2025), a 5% decrease. Reported emissions went from 702 tCO₂e to 815 tCO₂e over the same span (up 16%).
What does a site EUI of 300.8 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. Komo Plaza East & West Buildings's 300.8 kBtu/ft² across 524,610 sq ft works out to about 157.8 billion Btu (46,247 MWh-equivalent) in 2025. Its source EUI of 840.0 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 39,768,008 kWh of electricity and 5,480 therms of natural gas for the year.
Which law requires Komo Plaza East & West Buildings to report its energy use?
Komo Plaza East & West Buildings 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:50376:2025). 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 mixed use property buildings in Seattle
- 2200 Westlake· 516,407 sq ft · score 96 (A)
- Securities & Market Building Campus· 448,832 sq ft · EUI 27.9 kBtu/ft²
- 1150 Eastlake· 444,757 sq ft · EUI 101.3 kBtu/ft²
- UW MEDICINE-LK UNION PHASE II ITHS.ORG· 436,497 sq ft · EUI 174.1 kBtu/ft²
- Uw- Sandpoint Building # 5 (5a,5b,5c,5d)· 384,772 sq ft · EUI 45.5 kBtu/ft²
- First Hill Medical Pavilion (Hart First Hill Llc)· 383,914 sq ft · EUI 78.1 kBtu/ft²
- Mixed Use Property buildings in Seattle· 157 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 Komo Plaza East & West Buildings's energy grade?
Komo Plaza East & West Buildings did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 300.8 kBtu/ft².
How much energy does Komo Plaza East & West Buildings use?
Its 2025 site energy-use intensity was 300.8 kBtu/ft² (840.0 kBtu/ft² source) across 524,610 sq ft, including 39,768,008 kWh of electricity and 5,480 therms of natural gas.
What are Komo Plaza East & West Buildings's carbon emissions?
Komo Plaza East & West Buildings reported 815 tCO₂e of greenhouse-gas emissions (1.8 kgCO₂e/ft²) for 2025.
Where is Komo Plaza East & West Buildings?
Komo Plaza East & West Buildings is at 100 4TH AVE N, in Seattle, Washington 98109. Its coordinates are 47.61915, -122.34857 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Komo Plaza East & West Buildings and when was it built?
Komo Plaza East & West Buildings has 524,610 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2001 as its year built. It is classed as mixed use property.
Is Komo Plaza East & West Buildings 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, “Komo Plaza East & West Buildings, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/komo-plaza-east-west-buildings-d3c93c0b (data as of October 2, 2026).