Windsor Court
Multifamily Housing in Seattle, WA · 566 PROSPECT ST · 98109
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 96 (band A) |
| Site EUI | 27.5 kBtu/ft² |
| Source EUI | 76.9 kBtu/ft² |
| GHG emissions | 5 tCO₂e |
| GHG intensity | 0.2 kgCO₂e/ft² |
| Electricity | 247,363 kWh |
| Gross floor area | 30,720 sq ft |
| Source record | seattle:26281:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 96 | -1 | 27.5 kBtu/ft² | 5 tCO₂e |
| 2024 | 97 | +1 | 26.6 kBtu/ft² | 5 tCO₂e |
| 2023 | 96 | -2 | 27.9 kBtu/ft² | 5 tCO₂e |
| 2022 | 98 | +2 | 26.8 kBtu/ft² | 5 tCO₂e |
| 2021 | 96 | +4 | 28.4 kBtu/ft² | 5 tCO₂e |
| 2020 | 92 | -1 | 29.4 kBtu/ft² | 5 tCO₂e |
| 2019 | 93 | ±0 | 29.2 kBtu/ft² | 5 tCO₂e |
| 2018 | 93 | +3 | 29.0 kBtu/ft² | 5 tCO₂e |
| 2017 | 90 | +3 | 31.1 kBtu/ft² | 6 tCO₂e |
| 2016 | 87 | -3 | 29.8 kBtu/ft² | 5 tCO₂e |
| 2015 | 90 | 28.9 kBtu/ft² | 5 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
- 566 PROSPECT ST
- City
- Seattle
- State
- Washington
- ZIP
- 98109
- Coordinates
- 47.62922, -122.34529
Within ~1 km
Nearby benchmarked buildings
- 333 Dexter Ave Nscore 84
Office · 934,154 sq ft
- Bill & Melinda Gates Foundationscore 73
Office · 920,598 sq ft
Laboratory · 716,128 sq ft
Office · 593,200 sq ft
- Dexter Station Officescore 83
Office · 513,816 sq ft
- Block 38score —
Office · 512,665 sq ft
See also: most efficient in Seattle · biggest emitters
Frequently asked questions
What is Windsor Court's energy grade?
Windsor Court scores 96 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 Windsor Court use?
Its 2025 site energy-use intensity was 27.5 kBtu/ft² (76.9 kBtu/ft² source) across 30,720 sq ft, including 247,363 kWh of electricity.
What are Windsor Court's carbon emissions?
Windsor Court reported 5 tCO₂e of greenhouse-gas emissions (0.2 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:26281:2025.