At a glance
TRIANON BUILDING is a 57,620-square-foot office building at 2505 3RD AVE in Seattle, Washington, built in 1926. It is listed in the 2024 Building Energy Benchmarking disclosure without energy figures: no ENERGY STAR score, energy use or emissions were published for it that year. Its most recent reported figures are from 2023, when it scored 52 out of 100 on ENERGY STAR with a site EUI of 41.1 kBtu/ft².
No energy data reported for 2024
TRIANON BUILDING appears in the 2024 Building Energy Benchmarking disclosure, but no ENERGY STAR score, energy use or emissions were published for it — the building did not report benchmarking data for that year. Earlier reported years are in the table below.
Floor area on file: 57,620 sq ft · Built 1926
Source record seattle:19874:2024
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | — | — | |
| 2023 | 52 | +17 | 41.1 kBtu/ft² | 12 tCO₂e |
| 2022 | 35 | +4 | 51.5 kBtu/ft² | 15 tCO₂e |
| 2021 | 31 | -17 | 53.9 kBtu/ft² | 16 tCO₂e |
| 2020 | 48 | +9 | 43.0 kBtu/ft² | 12 tCO₂e |
| 2019 | 39 | -1 | 47.8 kBtu/ft² | 14 tCO₂e |
| 2018 | 40 | -31 | 47.6 kBtu/ft² | 14 tCO₂e |
| 2017 | 71 | +21 | 39.6 kBtu/ft² | 11 tCO₂e |
| 2016 | 50 | ±0 | 47.9 kBtu/ft² | 14 tCO₂e |
| 2015 | 50 | 48.0 kBtu/ft² | 14 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
- 2505 3RD AVE
- City
- Seattle
- State
- Washington
- ZIP
- 98121
- Coordinates
- 47.61616, -122.34771
Within ~1 km
Nearby benchmarked buildings
- Insignia Condosscore 47
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- 333 Dexter Ave Nscore 84
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- Climate Pledge Arenascore —
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- Via 6 Apartmentsscore —
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- Olympus Aptsscore 97
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See also: most efficient in Seattle · biggest emitters
How has TRIANON BUILDING's energy performance changed over time?
BuildingCensus holds 10 Seattle disclosures for TRIANON BUILDING, covering report years 2015–2024. Its ENERGY STAR score went from 50 in 2015 to 52 in 2023 (+2 points); its best year on file was 2017, at 71. Site EUI moved from 48.0 kBtu/ft² (2015) to 41.1 kBtu/ft² (2023), a 14% decrease. Reported emissions went from 14 tCO₂e to 12 tCO₂e over the same span (down 14%).
Which law requires TRIANON BUILDING to report its energy use?
TRIANON 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 2024 disclosure (source record seattle:19874:2024). 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
- 2324 Eastlake· 57,432 sq ft · EUI 66.6 kBtu/ft²
- 2345 Eastlake· 57,132 sq ft · score 67 (C)
- 18 West Mercer Building· 57,110 sq ft · score 86 (A)
- RAVENNA OFFICE BUILDING - DEMO· 56,896 sq ft · score 100 (A)
- Mutual Life Building· 56,700 sq ft · score 95 (A)
- Delridge Building· 55,593 sq ft · score 60 (C)
- 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 TRIANON BUILDING's energy grade?
TRIANON BUILDING has no grade: it did not report energy data for 2024. The 2024 Building Energy Benchmarking disclosure lists the building but publishes no ENERGY STAR score, energy use or emissions for it.
Where is TRIANON BUILDING?
TRIANON BUILDING is at 2505 3RD AVE, in Seattle, Washington 98121. Its coordinates are 47.61616, -122.34771 (latitude, longitude), as published in the Building Energy Benchmarking file.
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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, “TRIANON BUILDING, Seattle, Washington — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/trianon-building-7052209b (data as of October 2, 2026).