Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 96 (band A) |
| Site EUI | 23.7 kBtu/ft² |
| Source EUI | 64.8 kBtu/ft² |
| GHG emissions | 340 tCO₂e |
| GHG intensity | 0.2 kgCO₂e/ft² |
| Electricity | 11,578,340 kWh |
| Natural gas | 5,478 therms |
| Gross floor area | 1,605,578 sq ft |
| Source record | seattle:422:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 96 | ±0 | 23.7 kBtu/ft² | 340 tCO₂e |
| 2024 | 96 | ±0 | 24.1 kBtu/ft² | 346 tCO₂e |
| 2023 | 96 | ±0 | 24.6 kBtu/ft² | 367 tCO₂e |
| 2022 | 96 | -1 | 25.4 kBtu/ft² | 426 tCO₂e |
| 2021 | 97 | +3 | 24.6 kBtu/ft² | 398 tCO₂e |
| 2020 | 94 | +1 | 36.8 kBtu/ft² | 428 tCO₂e |
| 2019 | 93 | +2 | 38.7 kBtu/ft² | 492 tCO₂e |
| 2018 | 91 | +1 | 40.7 kBtu/ft² | 456 tCO₂e |
| 2017 | 90 | -7 | 34.9 kBtu/ft² | 392 tCO₂e |
| 2016 | 97 | ±0 | 36.8 kBtu/ft² | 475 tCO₂e |
| 2015 | 97 | 35.9 kBtu/ft² | 446 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
- 601 UNION ST
- City
- Seattle
- State
- Washington
- ZIP
- 98101
- Coordinates
- 47.61043, -122.33206
Within ~1 km
Nearby benchmarked buildings
- Columbia Centerscore 90
Office · 1,952,220 sq ft
- Seattle Convention Centerscore —
Convention Center · 1,842,925 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
- Us Bank Centerscore 87
Office · 1,536,606 sq ft
See also: most efficient in Seattle · biggest emitters
Frequently asked questions
What is Two Union Square's energy grade?
Two Union Square 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 Two Union Square use?
Its 2025 site energy-use intensity was 23.7 kBtu/ft² (64.8 kBtu/ft² source) across 1,605,578 sq ft, including 11,578,340 kWh of electricity and 5,478 therms of natural gas.
What are Two Union Square's carbon emissions?
Two Union Square reported 340 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:422:2025.