At a glance
Union Trust Building is a 39,030-square-foot office building at 119 S MAIN ST in Seattle, Washington, built in 1902. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 7.4 kBtu/ft² and 2 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 7.4 kBtu/ft² |
| Source EUI | 20.8 kBtu/ft² |
| GHG emissions | 2 tCO₂e |
| GHG intensity | 0.0 kgCO₂e/ft² |
| Electricity | 84,772 kWh |
| Gross floor area | 39,030 sq ft |
| Source record | seattle:25659:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 7.4 kBtu/ft² | 2 tCO₂e | |
| 2024 | — | — | — | |
| 2023 | 94 | ±0 | 24.2 kBtu/ft² | 22 tCO₂e |
| 2022 | 94 | -1 | 24.9 kBtu/ft² | 23 tCO₂e |
| 2021 | 95 | -1 | 21.7 kBtu/ft² | 18 tCO₂e |
| 2020 | 96 | +1 | 20.8 kBtu/ft² | 17 tCO₂e |
| 2019 | 95 | +1 | 23.1 kBtu/ft² | 21 tCO₂e |
| 2018 | 94 | +2 | 21.8 kBtu/ft² | 16 tCO₂e |
| 2017 | 92 | -7 | 23.3 kBtu/ft² | 19 tCO₂e |
| 2016 | 99 | ±0 | 18.4 kBtu/ft² | 13 tCO₂e |
| 2015 | 99 | 19.5 kBtu/ft² | 12 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
- 119 S MAIN ST
- City
- Seattle
- State
- Washington
- ZIP
- 98104
- Coordinates
- 47.59979, -122.33318
Within ~1 km
Nearby benchmarked buildings
- Columbia Centerscore 90
Office · 1,952,220 sq ft
- Centurylink Field-Stadiumscore —
Stadium (Open) · 1,913,640 sq ft
- Russell Investments Centerscore 92
Office · 1,592,914 sq ft
Office · 1,413,575 sq ft
- Seattle Municipal Towerscore 86
Office · 1,354,987 sq ft
- 999 Third Avescore 88
Office · 1,323,055 sq ft
See also: most efficient in Seattle · biggest emitters
How does Union Trust 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 7.4 kBtu/ft² is about 83% 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 0.0 kgCO₂e/ft² is about 94% below the group average of 0.7 kgCO₂e/ft².
At 39,030 sq ft, it is about 80% below the average floor area of 196,452 sq ft for those buildings. It was built in 1902, 63 years earlier 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 Union Trust Building's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Union Trust Building, covering report years 2015–2025. Its ENERGY STAR score went from 99 in 2015 to 94 in 2023 (-5 points); its best year on file was 2015, at 99. Site EUI moved from 19.5 kBtu/ft² (2015) to 7.4 kBtu/ft² (2025), a 62% decrease. Reported emissions went from 12 tCO₂e to 2 tCO₂e over the same span (down 86%).
What does a site EUI of 7.4 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 Trust Building's 7.4 kBtu/ft² across 39,030 sq ft works out to about 0.3 billion Btu (85 MWh-equivalent) in 2025. Its source EUI of 20.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 84,772 kWh of electricity for the year.
Which law requires Union Trust Building to report its energy use?
Union Trust 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:25659:2025). 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
- Duncan Building· 38,675 sq ft
- Rli Building· 38,460 sq ft · score 59 (C)
- Maynard Building· 38,376 sq ft · score 26 (D)
- Northwest Hospital & Medical Center - Medical Art Building #2· 38,121 sq ft · score 23 (D)
- Family Services· 38,075 sq ft · EUI 50.3 kBtu/ft²
- Sellen Office Bldg With Ec Land Parcels· 38,038 sq ft · score 85 (A)
- 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 Union Trust Building's energy grade?
Union Trust Building did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 7.4 kBtu/ft².
How much energy does Union Trust Building use?
Its 2025 site energy-use intensity was 7.4 kBtu/ft² (20.8 kBtu/ft² source) across 39,030 sq ft, including 84,772 kWh of electricity.
What are Union Trust Building's carbon emissions?
Union Trust Building reported 2 tCO₂e of greenhouse-gas emissions (0.0 kgCO₂e/ft²) for 2025.
Where is Union Trust Building?
Union Trust Building is at 119 S MAIN ST, in Seattle, Washington 98104. Its coordinates are 47.59979, -122.33318 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Union Trust Building and when was it built?
Union Trust Building has 39,030 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1902 as its year built. It is classed as office.
Is Union Trust 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, “Union Trust Building, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/union-trust-building-d0029a82 (data as of October 2, 2026).