At a glance
1800 9th Avenue Building is a 480,840-square-foot office building at 1800 9TH AVE in Seattle, Washington, built in 1990. In its 2025 Seattle benchmarking disclosure it reported an ENERGY STAR score of 99 out of 100 (grade A), a site energy-use intensity of 24.6 kBtu/ft² and 53 tCO₂e of greenhouse-gas emissions. That score is higher than 95% 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 | 99 (band A) |
| Site EUI | 24.6 kBtu/ft² |
| Source EUI | 68.5 kBtu/ft² |
| GHG emissions | 53 tCO₂e |
| GHG intensity | 0.2 kgCO₂e/ft² |
| Electricity | 2,423,566 kWh |
| Natural gas | 908 therms |
| Gross floor area | 480,840 sq ft |
| Source record | seattle:337:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 99 | +1 | 24.6 kBtu/ft² | 53 tCO₂e |
| 2024 | 98 | +9 | 28.3 kBtu/ft² | 60 tCO₂e |
| 2023 | 89 | 42.4 kBtu/ft² | 88 tCO₂e | |
| 2022 | — | — | — | |
| 2021 | — | — | — | |
| 2020 | 88 | -7 | 43.3 kBtu/ft² | 90 tCO₂e |
| 2019 | 95 | +8 | 39.2 kBtu/ft² | 82 tCO₂e |
| 2018 | 87 | +10 | 52.4 kBtu/ft² | 108 tCO₂e |
| 2017 | 77 | -17 | 63.8 kBtu/ft² | 132 tCO₂e |
| 2016 | 94 | ±0 | 52.7 kBtu/ft² | 110 tCO₂e |
| 2015 | 94 | 52.0 kBtu/ft² | 108 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
- 1800 9TH AVE
- City
- Seattle
- State
- Washington
- ZIP
- 98101
- Coordinates
- 47.61516, -122.33303
Within ~1 km
Nearby benchmarked buildings
- 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
- Onni South Lake Unionscore 77
Multifamily Housing · 1,546,084 sq ft
See also: most efficient in Seattle · biggest emitters
How does 1800 9th Avenue Building compare with other office buildings in Seattle?
The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. 1800 9th Avenue Building's ENERGY STAR score of 99 compares with an average of 76 across the 378 that report a score; it scores higher than 95% of them and lower than 4%. Its site EUI of 24.6 kBtu/ft² is about half of 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 0.2 kgCO₂e/ft² is about 77% below the group average of 0.7 kgCO₂e/ft².
At 480,840 sq ft, it is about 145% above the average floor area of 196,452 sq ft for those buildings. It was built in 1990, 25 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 1800 9th Avenue Building's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for 1800 9th Avenue Building, covering report years 2015–2025. Its ENERGY STAR score went from 94 in 2015 to 99 in 2025 (+5 points). Site EUI moved from 52.0 kBtu/ft² (2015) to 24.6 kBtu/ft² (2025), a 53% decrease. Reported emissions went from 108 tCO₂e to 53 tCO₂e over the same span (down 51%).
What does an ENERGY STAR score of 99 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 99 means the building performs better than about 99% of its national peers. BuildingCensus bands the score into report-card grades; 99 falls in band A — high performer (85–100). 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. 1800 9th Avenue Building's 24.6 kBtu/ft² across 480,840 sq ft works out to about 11.8 billion Btu (3,467 MWh-equivalent) in 2025. Its source EUI of 68.5 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 2,423,566 kWh of electricity and 908 therms of natural gas for the year.
Which law requires 1800 9th Avenue Building to report its energy use?
1800 9th Avenue 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:337:2025). 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
- Apollo Bldg (Amazon)· 480,702 sq ft · score 96 (A)
- Rainier Tower· 476,871 sq ft · score 80 (B)
- Park Place Office Bldg· 456,304 sq ft · score 72 (B)
- Financial Center· 453,106 sq ft · score 68 (C)
- King Street Center - King County· 446,261 sq ft · EUI 46.2 kBtu/ft²
- 505 First Avenue Building· 443,509 sq ft · EUI 37.7 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 1800 9th Avenue Building's energy grade?
1800 9th Avenue Building scores 99 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2025 Seattle disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 1800 9th Avenue Building use?
Its 2025 site energy-use intensity was 24.6 kBtu/ft² (68.5 kBtu/ft² source) across 480,840 sq ft, including 2,423,566 kWh of electricity and 908 therms of natural gas.
What are 1800 9th Avenue Building's carbon emissions?
1800 9th Avenue Building reported 53 tCO₂e of greenhouse-gas emissions (0.2 kgCO₂e/ft²) for 2025.
Where is 1800 9th Avenue Building?
1800 9th Avenue Building is at 1800 9TH AVE, in Seattle, Washington 98101. Its coordinates are 47.61516, -122.33303 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is 1800 9th Avenue Building and when was it built?
1800 9th Avenue Building has 480,840 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1990 as its year built. It is classed as office.
Is 1800 9th Avenue 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).
Working with Seattle building benchmarking records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “1800 9th Avenue Building, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/1800-9th-avenue-building-0206bab5 (data as of October 2, 2026).