At a glance
Duncan Building is a 38,675-square-foot office building at 315 2ND AVE S in Seattle, Washington, built in 1900.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | — |
| Source EUI | — |
| GHG emissions | — |
| GHG intensity | — |
| Electricity | 278,237 kWh |
| Gross floor area | 38,675 sq ft |
| Source record | seattle:26601:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | — | — | |
| 2024 | — | 78.7 kBtu/ft² | 22 tCO₂e | |
| 2023 | — | 83.2 kBtu/ft² | 30 tCO₂e | |
| 2022 | — | 98.5 kBtu/ft² | 40 tCO₂e | |
| 2021 | — | 82.5 kBtu/ft² | 25 tCO₂e | |
| 2020 | — | 78.9 kBtu/ft² | 19 tCO₂e | |
| 2019 | — | 100.2 kBtu/ft² | 30 tCO₂e | |
| 2018 | — | 152.9 kBtu/ft² | 75 tCO₂e | |
| 2017 | — | 87.0 kBtu/ft² | 39 tCO₂e | |
| 2016 | — | 118.4 kBtu/ft² | 42 tCO₂e | |
| 2015 | — | 111.5 kBtu/ft² | 38 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
- 315 2ND AVE S
- City
- Seattle
- State
- Washington
- ZIP
- 98104
- Coordinates
- 47.59954, -122.33201
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 Duncan Building compare with other office buildings in Seattle?
The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide.
At 38,675 sq ft, it is about 80% below the average floor area of 196,452 sq ft for those buildings. It was built in 1900, 65 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 Duncan Building's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Duncan Building, covering report years 2015–2025. Site EUI moved from 111.5 kBtu/ft² (2015) to 78.7 kBtu/ft² (2024), a 29% decrease. Reported emissions went from 38 tCO₂e to 22 tCO₂e over the same span (down 42%).
Which law requires Duncan Building to report its energy use?
Duncan 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:26601:2025). 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
- 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)
- Chophouse Row· 37,873 sq ft · EUI 74.4 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 Duncan Building's energy grade?
Duncan Building did not report an ENERGY STAR score in its 2025 disclosure.
How much energy does Duncan Building use?
No energy-use intensity was reported for 2025.
What are Duncan Building's carbon emissions?
No greenhouse-gas emissions figure was reported for 2025.
Where is Duncan Building?
Duncan Building is at 315 2ND AVE S, in Seattle, Washington 98104. Its coordinates are 47.59954, -122.33201 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Duncan Building and when was it built?
Duncan Building has 38,675 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1900 as its year built. It is classed as office.
Is Duncan 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, “Duncan Building, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/duncan-building-2fa7218f (data as of October 2, 2026).