At a glance
Four Seasons Hotel & 99 Union Street Private Residences is a 455,883-square-foot hotel at 99 UNION ST in Seattle, Washington, built in 2008. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 143.7 kBtu/ft² and 2,415 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 143.7 kBtu/ft² |
| Source EUI | 255.0 kBtu/ft² |
| GHG emissions | 2,415 tCO₂e |
| GHG intensity | 6.0 kgCO₂e/ft² |
| Electricity | 6,573,650 kWh |
| Natural gas | 195,630 therms |
| Gross floor area | 455,883 sq ft |
| Source record | seattle:27100:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 143.7 kBtu/ft² | 2,415 tCO₂e | |
| 2024 | — | 142.8 kBtu/ft² | 2,473 tCO₂e | |
| 2023 | — | 156.0 kBtu/ft² | 2,906 tCO₂e | |
| 2022 | — | 138.3 kBtu/ft² | 2,460 tCO₂e | |
| 2021 | — | 81.6 kBtu/ft² | 2,247 tCO₂e | |
| 2020 | — | 109.1 kBtu/ft² | 1,842 tCO₂e | |
| 2019 | 5 | ±0 | 148.2 kBtu/ft² | 2,575 tCO₂e |
| 2018 | 5 | ±0 | 150.4 kBtu/ft² | 2,782 tCO₂e |
| 2017 | 5 | +2 | 142.3 kBtu/ft² | 2,594 tCO₂e |
| 2016 | 3 | +2 | 142.6 kBtu/ft² | 2,535 tCO₂e |
| 2015 | 1 | 177.4 kBtu/ft² | 2,378 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
- 99 UNION ST
- City
- Seattle
- State
- Washington
- ZIP
- 98101
- Coordinates
- 47.60742, -122.33919
Within ~1 km
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- Russell Investments Centerscore 92
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See also: most efficient in Seattle · biggest emitters
How does Four Seasons Hotel & 99 Union Street Private Residences compare with other hotel buildings in Seattle?
The latest disclosures cover 86 hotel buildings in Seattle, out of 3,871 buildings citywide. Its site EUI of 143.7 kBtu/ft² is about twice the average of 68.4 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 6.0 kgCO₂e/ft² is about 203% above the group average of 2.0 kgCO₂e/ft².
At 455,883 sq ft, it is about 175% above the average floor area of 165,912 sq ft for those buildings. It was built in 2008, 38 years later than the group's average year built (1971). Across all 24 jurisdictions BuildingCensus covers, the 3,812 hotel buildings average an ENERGY STAR score of 65 and a site EUI of 77.8 kBtu/ft².
How has Four Seasons Hotel & 99 Union Street Private Residences's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Four Seasons Hotel & 99 Union Street Private Residences, covering report years 2015–2025. Its ENERGY STAR score went from 1 in 2015 to 5 in 2019 (+4 points); its best year on file was 2017, at 5. Site EUI moved from 177.4 kBtu/ft² (2015) to 143.7 kBtu/ft² (2025), a 19% decrease. Reported emissions went from 2,378 tCO₂e to 2,415 tCO₂e over the same span (up 2%).
What does a site EUI of 143.7 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. Four Seasons Hotel & 99 Union Street Private Residences's 143.7 kBtu/ft² across 455,883 sq ft works out to about 65.5 billion Btu (19,199 MWh-equivalent) in 2025. Its source EUI of 255.0 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 6,573,650 kWh of electricity and 195,630 therms of natural gas for the year.
Which law requires Four Seasons Hotel & 99 Union Street Private Residences to report its energy use?
Four Seasons Hotel & 99 Union Street Private Residences 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:27100:2025). 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 hotel buildings in Seattle
- Hotel 1000· 392,552 sq ft · score 63 (C)
- Crowne Plaza· 353,111 sq ft · score 90 (A)
- W Seattle Hotel· 333,176 sq ft · score 74 (B)
- Motif Seattle· 332,067 sq ft
- Seattle Waterfront Marriott· 293,030 sq ft · score 49 (D)
- Marriott Residence Inn· 282,863 sq ft · score 84 (B)
- Hotel buildings in Seattle· 86 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 Four Seasons Hotel & 99 Union Street Private Residences's energy grade?
Four Seasons Hotel & 99 Union Street Private Residences did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 143.7 kBtu/ft².
How much energy does Four Seasons Hotel & 99 Union Street Private Residences use?
Its 2025 site energy-use intensity was 143.7 kBtu/ft² (255.0 kBtu/ft² source) across 455,883 sq ft, including 6,573,650 kWh of electricity and 195,630 therms of natural gas.
What are Four Seasons Hotel & 99 Union Street Private Residences's carbon emissions?
Four Seasons Hotel & 99 Union Street Private Residences reported 2,415 tCO₂e of greenhouse-gas emissions (6.0 kgCO₂e/ft²) for 2025.
Where is Four Seasons Hotel & 99 Union Street Private Residences?
Four Seasons Hotel & 99 Union Street Private Residences is at 99 UNION ST, in Seattle, Washington 98101. Its coordinates are 47.60742, -122.33919 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Four Seasons Hotel & 99 Union Street Private Residences and when was it built?
Four Seasons Hotel & 99 Union Street Private Residences has 455,883 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2008 as its year built. It is classed as hotel.
Is Four Seasons Hotel & 99 Union Street Private Residences 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, “Four Seasons Hotel & 99 Union Street Private Residences, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/four-seasons-hotel-99-union-street-private-residences-fd993522 (data as of October 2, 2026).