At a glance
Heartwood/Fobes 558 is a 32,250-square-foot office building at 558 1ST AVE S in Seattle, Washington, built in 1910. In its 2025 Seattle benchmarking disclosure it reported an ENERGY STAR score of 67 out of 100 (grade C), a site energy-use intensity of 26.2 kBtu/ft² and 10 tCO₂e of greenhouse-gas emissions. That score is higher than 23% of the 378 scored office buildings in Seattle.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 67 (band C) |
| Site EUI | 26.2 kBtu/ft² |
| Source EUI | 66.9 kBtu/ft² |
| GHG emissions | 10 tCO₂e |
| GHG intensity | 0.3 kgCO₂e/ft² |
| Electricity | 212,961 kWh |
| Natural gas | 1,172 therms |
| Gross floor area | 32,250 sq ft |
| Source record | seattle:24711:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 67 | -4 | 26.2 kBtu/ft² | 10 tCO₂e |
| 2024 | 71 | -1 | 23.5 kBtu/ft² | 7 tCO₂e |
| 2023 | 72 | +1 | 24.2 kBtu/ft² | 9 tCO₂e |
| 2022 | 71 | -2 | 25.3 kBtu/ft² | 11 tCO₂e |
| 2021 | 73 | -5 | 23.5 kBtu/ft² | 9 tCO₂e |
| 2020 | 78 | +7 | 21.1 kBtu/ft² | 8 tCO₂e |
| 2019 | 71 | +2 | 24.2 kBtu/ft² | 9 tCO₂e |
| 2018 | 69 | +10 | 24.4 kBtu/ft² | 8 tCO₂e |
| 2017 | 59 | -33 | 24.5 kBtu/ft² | 10 tCO₂e |
| 2016 | 92 | +1 | 24.7 kBtu/ft² | 11 tCO₂e |
| 2015 | 91 | 24.4 kBtu/ft² | 11 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
- 558 1ST AVE S
- City
- Seattle
- State
- Washington
- ZIP
- 98104
- Coordinates
- 47.59657, -122.33394
Within ~1 km
Nearby benchmarked buildings
- Columbia Centerscore 90
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- Centurylink Field-Stadiumscore —
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- T-Mobile Park (Safeco Field)score —
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- Embassy Suites- Downtown Seattlescore 91
Mixed Use Property · 680,770 sq ft
Multifamily Housing · 619,416 sq ft
See also: most efficient in Seattle · biggest emitters
How does Heartwood/Fobes 558 compare with other office buildings in Seattle?
The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. Heartwood/Fobes 558's ENERGY STAR score of 67 compares with an average of 76 across the 378 that report a score; it scores higher than 23% of them and lower than 76%. Its site EUI of 26.2 kBtu/ft² is about 42% 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 0.3 kgCO₂e/ft² is about half of the group average of 0.7 kgCO₂e/ft².
At 32,250 sq ft, it is about 84% below the average floor area of 196,452 sq ft for those buildings. It was built in 1910, 55 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 Heartwood/Fobes 558's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Heartwood/Fobes 558, covering report years 2015–2025. Its ENERGY STAR score went from 91 in 2015 to 67 in 2025 (-24 points); its best year on file was 2016, at 92. Site EUI moved from 24.4 kBtu/ft² (2015) to 26.2 kBtu/ft² (2025), an 7% increase. Reported emissions went from 11 tCO₂e to 10 tCO₂e over the same span (down 2%).
What does an ENERGY STAR score of 67 mean?
ENERGY STAR scores run from 1 to 100 and are computed by the EPA's Portfolio Manager as a percentile against similar buildings nationwide, adjusted for climate, size and use: a score of 67 means the building performs better than about 67% of its national peers. BuildingCensus bands the score into report-card grades; 67 falls in band C — below median (55–69). It sits 8 points below 75, the threshold for ENERGY STAR certification. In Seattle, 69% of scored buildings are at 75 or above.
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. Heartwood/Fobes 558's 26.2 kBtu/ft² across 32,250 sq ft works out to about 0.8 billion Btu (248 MWh-equivalent) in 2025. Its source EUI of 66.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 212,961 kWh of electricity and 1,172 therms of natural gas for the year.
Which law requires Heartwood/Fobes 558 to report its energy use?
Heartwood/Fobes 558 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:24711:2025). 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
- COMMUTER CENTER BUILDING· 32,160 sq ft · EUI 64.0 kBtu/ft²
- 1430-1448 Elliott Ave W· 32,031 sq ft · score 85 (A)
- Pier 55· 32,027 sq ft · score 82 (B)
- Wallingford Retail And Office Building· 31,774 sq ft · score 70 (B)
- Solid Ground· 31,686 sq ft · score 73 (B)
- Nippon Kan/Kobe Park Building· 31,432 sq ft · score 11 (D)
- 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 Heartwood/Fobes 558's energy grade?
Heartwood/Fobes 558 scores 67 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2025 Seattle disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Heartwood/Fobes 558 use?
Its 2025 site energy-use intensity was 26.2 kBtu/ft² (66.9 kBtu/ft² source) across 32,250 sq ft, including 212,961 kWh of electricity and 1,172 therms of natural gas.
What are Heartwood/Fobes 558's carbon emissions?
Heartwood/Fobes 558 reported 10 tCO₂e of greenhouse-gas emissions (0.3 kgCO₂e/ft²) for 2025.
Where is Heartwood/Fobes 558?
Heartwood/Fobes 558 is at 558 1ST AVE S, in Seattle, Washington 98104. Its coordinates are 47.59657, -122.33394 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Heartwood/Fobes 558 and when was it built?
Heartwood/Fobes 558 has 32,250 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1910 as its year built. It is classed as office.
Is Heartwood/Fobes 558 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, “Heartwood/Fobes 558, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/heartwood-fobes-558-7af1934d (data as of October 2, 2026).