Union 18 Apartments
Multifamily Housing in Seattle, WA · 1140 18TH AVE · 98122
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 83 (band B) |
| Site EUI | 32.8 kBtu/ft² |
| Source EUI | 77.0 kBtu/ft² |
| GHG emissions | 32 tCO₂e |
| GHG intensity | 0.6 kgCO₂e/ft² |
| Electricity | 396,136 kWh |
| Natural gas | 4,699 therms |
| Gross floor area | 37,824 sq ft |
| Source record | seattle:27981:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 83 | +1 | 32.8 kBtu/ft² | 32 tCO₂e |
| 2024 | 82 | ±0 | 33.1 kBtu/ft² | 33 tCO₂e |
| 2023 | 82 | -1 | 33.1 kBtu/ft² | 33 tCO₂e |
| 2022 | 83 | -1 | 33.9 kBtu/ft² | 34 tCO₂e |
| 2021 | 84 | +20 | 32.4 kBtu/ft² | 31 tCO₂e |
| 2020 | 64 | -4 | 41.2 kBtu/ft² | 34 tCO₂e |
| 2019 | 68 | -5 | 40.8 kBtu/ft² | 35 tCO₂e |
| 2018 | 73 | 39.5 kBtu/ft² | 35 tCO₂e | |
| 2017 | — | 41.2 kBtu/ft² | 35 tCO₂e | |
| 2016 | 79 | 34.8 kBtu/ft² | 29 tCO₂e | |
| 2015 | — | 23.1 kBtu/ft² | 14 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
- 1140 18TH AVE
- City
- Seattle
- State
- Washington
- ZIP
- 98122
- Coordinates
- 47.61269, -122.30850
Within ~1 km
Nearby benchmarked buildings
Medical Office · 905,911 sq ft
Hospital (General Medical & Surgical) · 597,519 sq ft
Multifamily Housing · 436,074 sq ft
- Midtown Squarescore 61
Multifamily Housing · 427,863 sq ft
Medical Office · 320,946 sq ft
- Garfield High (Sps-District)score 81
K-12 School · 254,523 sq ft
See also: most efficient in Seattle · biggest emitters
Frequently asked questions
What is Union 18 Apartments's energy grade?
Union 18 Apartments scores 83 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 Union 18 Apartments use?
Its 2025 site energy-use intensity was 32.8 kBtu/ft² (77.0 kBtu/ft² source) across 37,824 sq ft, including 396,136 kWh of electricity and 4,699 therms of natural gas.
What are Union 18 Apartments's carbon emissions?
Union 18 Apartments reported 32 tCO₂e of greenhouse-gas emissions (0.6 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:27981:2025.