At a glance
1518 5th Ave Office is a 40,260-square-foot office building at 1520 5TH AVE in Seattle, Washington, built in 1903. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 0.1 kBtu/ft² and 0 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 0.1 kBtu/ft² |
| Source EUI | 0.3 kBtu/ft² |
| GHG emissions | 0 tCO₂e |
| GHG intensity | — |
| Electricity | 738 kWh |
| Gross floor area | 40,260 sq ft |
| Source record | seattle:21315:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 0.1 kBtu/ft² | 0 tCO₂e | |
| 2024 | — | 0.1 kBtu/ft² | — | |
| 2023 | — | 0.1 kBtu/ft² | — | |
| 2022 | — | 0.1 kBtu/ft² | — | |
| 2021 | — | 16.8 kBtu/ft² | 3 tCO₂e | |
| 2020 | — | 53.3 kBtu/ft² | 9 tCO₂e | |
| 2019 | — | 78.6 kBtu/ft² | 12 tCO₂e | |
| 2018 | — | 0.9 kBtu/ft² | 0 tCO₂e | |
| 2017 | — | 1.2 kBtu/ft² | 0 tCO₂e | |
| 2016 | — | 1.0 kBtu/ft² | 0 tCO₂e | |
| 2015 | 100 | 1.8 kBtu/ft² | 0 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
- 1520 5TH AVE
- City
- Seattle
- State
- Washington
- ZIP
- 98101
- Coordinates
- 47.61119, -122.33581
Within ~1 km
Nearby benchmarked buildings
- Columbia Centerscore 90
Office · 1,952,220 sq ft
- Seattle Convention Centerscore —
Convention Center · 1,842,925 sq ft
- Two Union Squarescore 96
Office · 1,605,578 sq ft
Office · 1,599,394 sq ft
- Day 1 Tower And Spheres (Amazon)score 93
Office · 1,599,230 sq ft
- Russell Investments Centerscore 92
Office · 1,592,914 sq ft
See also: most efficient in Seattle · biggest emitters
How does 1518 5th Ave Office 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 0.1 kBtu/ft² is about 100% below the average of 44.8 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 40,260 sq ft, it is about 80% below the average floor area of 196,452 sq ft for those buildings. It was built in 1903, 62 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 1518 5th Ave Office's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for 1518 5th Ave Office, covering report years 2015–2025. Site EUI moved from 1.8 kBtu/ft² (2015) to 0.1 kBtu/ft² (2025), a 94% decrease. Reported emissions went from 0 tCO₂e to 0 tCO₂e over the same span (down 97%).
What does a site EUI of 0.1 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. 1518 5th Ave Office's 0.1 kBtu/ft² across 40,260 sq ft works out to about 0 billion Btu (1 MWh-equivalent) in 2025. Its source EUI of 0.3 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 738 kWh of electricity for the year.
Which law requires 1518 5th Ave Office to report its energy use?
1518 5th Ave Office 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:21315:2025). 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
- PEARL WARREN BUILDING- DEMOLISHED INACTIVE· 40,227 sq ft · score 89 (A)
- St Joseph's Church· 40,137 sq ft · score 95 (A)
- 4 Nick - Office· 40,067 sq ft · EUI 45.6 kBtu/ft²
- Hathaway Bldg· 40,029 sq ft · score 72 (B)
- Holyoke Building· 39,960 sq ft · score 76 (B)
- Rcc· 39,953 sq ft · score 70 (B)
- 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 1518 5th Ave Office's energy grade?
1518 5th Ave Office did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 0.1 kBtu/ft².
How much energy does 1518 5th Ave Office use?
Its 2025 site energy-use intensity was 0.1 kBtu/ft² (0.3 kBtu/ft² source) across 40,260 sq ft, including 738 kWh of electricity.
What are 1518 5th Ave Office's carbon emissions?
1518 5th Ave Office reported 0 tCO₂e of greenhouse-gas emissions for 2025.
Where is 1518 5th Ave Office?
1518 5th Ave Office is at 1520 5TH AVE, in Seattle, Washington 98101. Its coordinates are 47.61119, -122.33581 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is 1518 5th Ave Office and when was it built?
1518 5th Ave Office has 40,260 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1903 as its year built. It is classed as office.
Is 1518 5th Ave Office 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, “1518 5th Ave Office, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/1518-5th-ave-office-cf544ef9 (data as of October 2, 2026).