Imperial House
Multifamily Housing in Seattle, WA · 520 S MAIN ST · 98104
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 31 (band D) |
| Site EUI | 57.9 kBtu/ft² |
| Source EUI | 127.4 kBtu/ft² |
| GHG emissions | 94 tCO₂e |
| GHG intensity | 1.3 kgCO₂e/ft² |
| Electricity | 829,076 kWh |
| Natural gas | 14,736 therms |
| Gross floor area | 74,327 sq ft |
| Source record | seattle:26723:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 31 | -25 | 57.9 kBtu/ft² | 94 tCO₂e |
| 2024 | 56 | +15 | 38.5 kBtu/ft² | 17 tCO₂e |
| 2023 | 41 | +13 | 52.8 kBtu/ft² | 78 tCO₂e |
| 2022 | 28 | -1 | 61.9 kBtu/ft² | 104 tCO₂e |
| 2021 | 29 | -1 | 59.2 kBtu/ft² | 92 tCO₂e |
| 2020 | 30 | -2 | 58.8 kBtu/ft² | 101 tCO₂e |
| 2019 | 32 | -11 | 59.5 kBtu/ft² | 106 tCO₂e |
| 2018 | 43 | +14 | 55.0 kBtu/ft² | 99 tCO₂e |
| 2017 | 29 | +5 | 59.9 kBtu/ft² | 95 tCO₂e |
| 2016 | 24 | -3 | 56.6 kBtu/ft² | 93 tCO₂e |
| 2015 | 27 | 55.4 kBtu/ft² | 92 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
- 520 S MAIN ST
- City
- Seattle
- State
- Washington
- ZIP
- 98104
- Coordinates
- 47.60021, -122.32672
Within ~1 km
Nearby benchmarked buildings
- Columbia Centerscore 90
Office · 1,952,220 sq ft
Hospital (General Medical & Surgical) · 1,926,841 sq ft
- Centurylink Field-Stadiumscore —
Stadium (Open) · 1,913,640 sq ft
- Seattle Municipal Towerscore 86
Office · 1,354,987 sq ft
- 999 Third Avescore 88
Office · 1,323,055 sq ft
Office · 1,249,055 sq ft
See also: most efficient in Seattle · biggest emitters
Frequently asked questions
What is Imperial House's energy grade?
Imperial House scores 31 out of 100 on ENERGY STAR — band D (Lowest band (1–54)) — in its 2025 Seattle disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Imperial House use?
Its 2025 site energy-use intensity was 57.9 kBtu/ft² (127.4 kBtu/ft² source) across 74,327 sq ft, including 829,076 kWh of electricity and 14,736 therms of natural gas.
What are Imperial House's carbon emissions?
Imperial House reported 94 tCO₂e of greenhouse-gas emissions (1.3 kgCO₂e/ft²) for 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.
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Dataset updated . Source: Building Energy Benchmarking disclosure, record seattle:26723:2025.