At a glance
705 Union Station is a 273,185-square-foot office building at 705 5TH AVE S in Seattle, Washington, built in 2000. In its 2025 Seattle benchmarking disclosure it reported an ENERGY STAR score of 79 out of 100 (grade B), a site energy-use intensity of 39.2 kBtu/ft² and 63 tCO₂e of greenhouse-gas emissions. That score is higher than 40% 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 | 79 (band B) |
| Site EUI | 39.2 kBtu/ft² |
| Source EUI | 109.9 kBtu/ft² |
| GHG emissions | 63 tCO₂e |
| GHG intensity | 0.2 kgCO₂e/ft² |
| Electricity | 3,178,177 kWh |
| Gross floor area | 273,185 sq ft |
| Source record | seattle:29552:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 79 | -1 | 39.2 kBtu/ft² | 63 tCO₂e |
| 2024 | 80 | +3 | 39.3 kBtu/ft² | 63 tCO₂e |
| 2023 | 77 | +9 | 42.1 kBtu/ft² | 67 tCO₂e |
| 2022 | 68 | +3 | 46.1 kBtu/ft² | 74 tCO₂e |
| 2021 | 65 | -12 | 46.2 kBtu/ft² | 74 tCO₂e |
| 2020 | 77 | +3 | 38.7 kBtu/ft² | 62 tCO₂e |
| 2019 | 74 | +4 | 45.4 kBtu/ft² | 74 tCO₂e |
| 2018 | 70 | -7 | 48.9 kBtu/ft² | 80 tCO₂e |
| 2017 | 77 | -14 | 46.9 kBtu/ft² | 77 tCO₂e |
| 2016 | 91 | +2 | 48.8 kBtu/ft² | 80 tCO₂e |
| 2015 | 89 | 49.6 kBtu/ft² | 81 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
- 705 5TH AVE S
- City
- Seattle
- State
- Washington
- ZIP
- 98104
- Coordinates
- 47.59634, -122.32807
Within ~1 km
Nearby benchmarked buildings
Hospital (General Medical & Surgical) · 1,926,841 sq ft
- Centurylink Field-Stadiumscore —
Stadium (Open) · 1,913,640 sq ft
- T-Mobile Park (Safeco Field)score —
Other - Entertainment/Public Assembly · 1,172,127 sq ft
Parking · 872,409 sq ft
- 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 705 Union Station compare with other office buildings in Seattle?
The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. 705 Union Station's ENERGY STAR score of 79 compares with an average of 76 across the 378 that report a score; it scores higher than 40% of them and lower than 58%. Its site EUI of 39.2 kBtu/ft² is about 12% 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 0.2 kgCO₂e/ft² is about 67% below the group average of 0.7 kgCO₂e/ft².
At 273,185 sq ft, it is about 39% above the average floor area of 196,452 sq ft for those buildings. It was built in 2000, 35 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 705 Union Station's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for 705 Union Station, covering report years 2015–2025. Its ENERGY STAR score went from 89 in 2015 to 79 in 2025 (-10 points); its best year on file was 2016, at 91. Site EUI moved from 49.6 kBtu/ft² (2015) to 39.2 kBtu/ft² (2025), a 21% decrease. Reported emissions went from 81 tCO₂e to 63 tCO₂e over the same span (down 22%).
What does an ENERGY STAR score of 79 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 79 means the building performs better than about 79% of its national peers. BuildingCensus bands the score into report-card grades; 79 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. 705 Union Station's 39.2 kBtu/ft² across 273,185 sq ft works out to about 10.7 billion Btu (3,138 MWh-equivalent) in 2025. Its source EUI of 109.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 3,178,177 kWh of electricity for the year.
Which law requires 705 Union Station to report its energy use?
705 Union Station 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:29552:2025). 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
- City Place Ii (Fiona)· 271,071 sq ft · score 97 (A)
- 605 Union Station· 268,130 sq ft · EUI 28.3 kBtu/ft²
- 400 Westlake Building· 268,005 sq ft · score 100 (A)
- PLAZA 600 BUILDING· 265,851 sq ft · score 81 (B)
- Amazon- Unicorn· 254,218 sq ft · score 62 (C)
- 3101 Western (Formerly Airborne Bldg)· 253,103 sq ft · score 3 (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 705 Union Station's energy grade?
705 Union Station scores 79 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2025 Seattle disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 705 Union Station use?
Its 2025 site energy-use intensity was 39.2 kBtu/ft² (109.9 kBtu/ft² source) across 273,185 sq ft, including 3,178,177 kWh of electricity.
What are 705 Union Station's carbon emissions?
705 Union Station reported 63 tCO₂e of greenhouse-gas emissions (0.2 kgCO₂e/ft²) for 2025.
Where is 705 Union Station?
705 Union Station is at 705 5TH AVE S, in Seattle, Washington 98104. Its coordinates are 47.59634, -122.32807 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is 705 Union Station and when was it built?
705 Union Station has 273,185 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2000 as its year built. It is classed as office.
Is 705 Union Station 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, “705 Union Station, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/705-union-station-88e803e1 (data as of October 2, 2026).