Union Bay Lofts
Mixed Use Property in Seattle, WA · 3218 EASTLAKE AVE E · 98102
At a glance
Union Bay Lofts is a 35,746-square-foot mixed use property building at 3218 EASTLAKE AVE E in Seattle, Washington, built in 2008. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 50.2 kBtu/ft² and 10 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 50.2 kBtu/ft² |
| Source EUI | 133.8 kBtu/ft² |
| GHG emissions | 10 tCO₂e |
| GHG intensity | 0.5 kgCO₂e/ft² |
| Electricity | 273,544 kWh |
| Natural gas | 785 therms |
| Gross floor area | 35,746 sq ft |
| Source record | seattle:20858:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 50.2 kBtu/ft² | 10 tCO₂e | |
| 2024 | — | 50.7 kBtu/ft² | 10 tCO₂e | |
| 2023 | — | 51.8 kBtu/ft² | 10 tCO₂e | |
| 2022 | — | 51.2 kBtu/ft² | 6 tCO₂e | |
| 2021 | — | 48.6 kBtu/ft² | 7 tCO₂e | |
| 2020 | — | 50.1 kBtu/ft² | 11 tCO₂e | |
| 2019 | — | 52.7 kBtu/ft² | 6 tCO₂e | |
| 2018 | — | 47.1 kBtu/ft² | 6 tCO₂e | |
| 2017 | — | 63.6 kBtu/ft² | 7 tCO₂e | |
| 2016 | — | 58.4 kBtu/ft² | 7 tCO₂e | |
| 2015 | — | 55.9 kBtu/ft² | 7 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
- 3218 EASTLAKE AVE E
- City
- Seattle
- State
- Washington
- ZIP
- 98102
- Coordinates
- 47.65058, -122.32159
Within ~1 km
Nearby benchmarked buildings
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- Northlake Commonsscore —
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- Augusta Apartmentsscore 100
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- Accoladescore 94
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- Eastlake 2851score 100
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See also: most efficient in Seattle · biggest emitters
How does Union Bay Lofts 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 50.2 kBtu/ft² is about 27% below the average of 68.7 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 0.5 kgCO₂e/ft² is about 66% below the group average of 1.4 kgCO₂e/ft².
At 35,746 sq ft, it is about 78% below the average floor area of 165,352 sq ft for those buildings. It was built in 2008, 40 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 Union Bay Lofts's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Union Bay Lofts, covering report years 2015–2025. Site EUI moved from 55.9 kBtu/ft² (2015) to 50.2 kBtu/ft² (2025), a 10% decrease. Reported emissions went from 7 tCO₂e to 10 tCO₂e over the same span (up 47%).
What does a site EUI of 50.2 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. Union Bay Lofts's 50.2 kBtu/ft² across 35,746 sq ft works out to about 1.8 billion Btu (526 MWh-equivalent) in 2025. Its source EUI of 133.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 273,544 kWh of electricity and 785 therms of natural gas for the year.
Which law requires Union Bay Lofts to report its energy use?
Union Bay Lofts 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:20858:2025). 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
- West Seattle Venture Llc· 35,176 sq ft · EUI 30.9 kBtu/ft²
- KEY BANK- SCHEDULED TO BE DEMOLISHED 2021/INACTIVE· 34,948 sq ft · score 71 (B)
- Pike Building· 34,914 sq ft · EUI 32.8 kBtu/ft²
- CHANDLERS COVE- INACTIVE (Under 20K minus parking GFA)· 34,639 sq ft · EUI 43.9 kBtu/ft²
- Dunn Bldg/Starbucks· 34,617 sq ft · EUI 145.8 kBtu/ft²
- Lake Union Tower· 33,978 sq ft
- 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 Union Bay Lofts's energy grade?
Union Bay Lofts did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 50.2 kBtu/ft².
How much energy does Union Bay Lofts use?
Its 2025 site energy-use intensity was 50.2 kBtu/ft² (133.8 kBtu/ft² source) across 35,746 sq ft, including 273,544 kWh of electricity and 785 therms of natural gas.
What are Union Bay Lofts's carbon emissions?
Union Bay Lofts reported 10 tCO₂e of greenhouse-gas emissions (0.5 kgCO₂e/ft²) for 2025.
Where is Union Bay Lofts?
Union Bay Lofts is at 3218 EASTLAKE AVE E, in Seattle, Washington 98102. Its coordinates are 47.65058, -122.32159 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Union Bay Lofts and when was it built?
Union Bay Lofts has 35,746 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2008 as its year built. It is classed as mixed use property.
Is Union Bay Lofts 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, “Union Bay Lofts, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/union-bay-lofts-8c5fd63b (data as of October 2, 2026).