At a glance
PLAZA 600 BUILDING is a 265,851-square-foot office building at 600 STEWART ST in Seattle, Washington, built in 1969. In its 2024 Seattle benchmarking disclosure it reported an ENERGY STAR score of 81 out of 100 (grade B), a site energy-use intensity of 61.8 kBtu/ft² and 815 tCO₂e of greenhouse-gas emissions. That score is higher than 44% of the 378 scored office buildings in Seattle.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 81 (band B) |
| Site EUI | 61.8 kBtu/ft² |
| Source EUI | 110.5 kBtu/ft² |
| GHG emissions | 815 tCO₂e |
| GHG intensity | 3.3 kgCO₂e/ft² |
| Electricity | 1,629,814 kWh |
| Gross floor area | 265,851 sq ft |
| Source record | seattle:333:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 81 | +4 | 61.8 kBtu/ft² | 815 tCO₂e |
| 2023 | 77 | -2 | 65.2 kBtu/ft² | 748 tCO₂e |
| 2022 | 79 | +4 | 67.7 kBtu/ft² | 806 tCO₂e |
| 2021 | 75 | -2 | 71.9 kBtu/ft² | 832 tCO₂e |
| 2020 | 77 | +2 | 76.4 kBtu/ft² | 853 tCO₂e |
| 2019 | 75 | -4 | 77.9 kBtu/ft² | 831 tCO₂e |
| 2018 | 79 | +4 | 71.4 kBtu/ft² | 735 tCO₂e |
| 2017 | 75 | -15 | 69.5 kBtu/ft² | 683 tCO₂e |
| 2016 | 90 | -5 | 64.6 kBtu/ft² | 579 tCO₂e |
| 2015 | 95 | 57.2 kBtu/ft² | 524 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
- 600 STEWART ST
- City
- Seattle
- State
- Washington
- ZIP
- 98101
- Coordinates
- 47.61402, -122.33712
Within ~1 km
Nearby benchmarked buildings
- Seattle Convention Centerscore —
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- Day 1 Tower And Spheres (Amazon)score 93
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- Russell Investments Centerscore 92
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- Onni South Lake Unionscore 77
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See also: most efficient in Seattle · biggest emitters
How does PLAZA 600 BUILDING compare with other office buildings in Seattle?
The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. PLAZA 600 BUILDING's ENERGY STAR score of 81 compares with an average of 76 across the 378 that report a score; it scores higher than 44% of them and lower than 53%. Its site EUI of 61.8 kBtu/ft² is about 38% above the average of 44.8 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 3.3 kgCO₂e/ft² is about 373% above the group average of 0.7 kgCO₂e/ft².
At 265,851 sq ft, it is about 35% above the average floor area of 196,452 sq ft for those buildings. It was built in 1969, 4 years later 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 PLAZA 600 BUILDING's energy performance changed over time?
BuildingCensus holds 10 Seattle disclosures for PLAZA 600 BUILDING, covering report years 2015–2024. Its ENERGY STAR score went from 95 in 2015 to 81 in 2024 (-14 points); its best year on file was 2015, at 95. Site EUI moved from 57.2 kBtu/ft² (2015) to 61.8 kBtu/ft² (2024), an 8% increase. Reported emissions went from 524 tCO₂e to 815 tCO₂e over the same span (up 55%).
What does an ENERGY STAR score of 81 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 81 means the building performs better than about 81% of its national peers. BuildingCensus bands the score into report-card grades; 81 falls in band B — above median (70–84). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. 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. PLAZA 600 BUILDING's 61.8 kBtu/ft² across 265,851 sq ft works out to about 16.4 billion Btu (4,815 MWh-equivalent) in 2024. Its source EUI of 110.5 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,629,814 kWh of electricity for the year.
Which law requires PLAZA 600 BUILDING to report its energy use?
PLAZA 600 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:333:2024). 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
- Amazon- Unicorn· 254,218 sq ft · score 62 (C)
- 3101 Western (Formerly Airborne Bldg)· 253,103 sq ft · score 3 (D)
- World Trade Center North· 251,044 sq ft · score 100 (A)
- Fremont Lake Union Center - Plaza Bldg· 243,334 sq ft · score 98 (A)
- West Tower· 241,875 sq ft · EUI 28.6 kBtu/ft²
- Maritime Building· 241,685 sq ft · EUI 17.1 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 PLAZA 600 BUILDING's energy grade?
PLAZA 600 BUILDING scores 81 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2024 Seattle disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does PLAZA 600 BUILDING use?
Its 2024 site energy-use intensity was 61.8 kBtu/ft² (110.5 kBtu/ft² source) across 265,851 sq ft, including 1,629,814 kWh of electricity.
What are PLAZA 600 BUILDING's carbon emissions?
PLAZA 600 BUILDING reported 815 tCO₂e of greenhouse-gas emissions (3.3 kgCO₂e/ft²) for 2024.
Where is PLAZA 600 BUILDING?
PLAZA 600 BUILDING is at 600 STEWART ST, in Seattle, Washington 98101. Its coordinates are 47.61402, -122.33712 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is PLAZA 600 BUILDING and when was it built?
PLAZA 600 BUILDING has 265,851 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1969 as its year built. It is classed as office.
Is PLAZA 600 BUILDING covered by the Seattle Energy Benchmarking Ordinance (SMC 22.920)?
Yes — it appears in the 2024 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, “PLAZA 600 BUILDING, Seattle, Washington — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/plaza-600-building-384260b0 (data as of October 2, 2026).