Alt Apartments
Multifamily Housing in Seattle, WA · 421 BELMONT AVE E · 98102
At a glance
Alt Apartments is a 38,942-square-foot multifamily housing building at 421 BELMONT AVE E in Seattle, Washington, built in 2023.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | — |
| Source EUI | — |
| GHG emissions | — |
| GHG intensity | — |
| Natural gas | 4,732 therms |
| Gross floor area | 38,942 sq ft |
| Source record | seattle:52061:2025 |
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
- 421 BELMONT AVE E
- City
- Seattle
- State
- Washington
- ZIP
- 98102
- Coordinates
- 47.62263, -122.32429
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Alt Apartments compare with other multifamily housing buildings in Seattle?
The latest disclosures cover 1,971 multifamily housing buildings in Seattle, out of 3,871 buildings citywide.
At 38,942 sq ft, it is about half of the average floor area of 86,468 sq ft for those buildings. It was built in 2023, 40 years later than the group's average year built (1983). Across all 24 jurisdictions BuildingCensus covers, the 59,945 multifamily housing buildings average an ENERGY STAR score of 70 and a site EUI of 59.0 kBtu/ft².
Which law requires Alt Apartments to report its energy use?
Alt Apartments 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:52061:2025). 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 multifamily housing buildings in Seattle
- Clark Apartments· 38,780 sq ft · score 100 (A)
- Lucknow/Waterfall Place Apts· 38,765 sq ft · score 92 (A)
- Alki Bonair Condominium· 38,765 sq ft · score 96 (A)
- Pike Flats· 38,724 sq ft · EUI 55.6 kBtu/ft²
- Merrill Court Condominium· 38,720 sq ft · EUI 63.7 kBtu/ft²
- 80 Main Apartments· 38,717 sq ft · score 85 (A)
- Multifamily Housing buildings in Seattle· 1,971 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 Alt Apartments's energy grade?
Alt Apartments did not report an ENERGY STAR score in its 2025 disclosure.
How much energy does Alt Apartments use?
No energy-use intensity was reported for 2025.
What are Alt Apartments's carbon emissions?
No greenhouse-gas emissions figure was reported for 2025.
Where is Alt Apartments?
Alt Apartments is at 421 BELMONT AVE E, in Seattle, Washington 98102. Its coordinates are 47.62263, -122.32429 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Alt Apartments and when was it built?
Alt Apartments has 38,942 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2023 as its year built. It is classed as multifamily housing.
Is Alt Apartments 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, “Alt Apartments, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/alt-apartments-eddee72b (data as of October 2, 2026).