Sidney Apartments
Multifamily Housing in Seattle, WA · 400 WALL ST · 98121
At a glance
Sidney Apartments is a 160,141-square-foot multifamily housing building at 400 WALL ST in Seattle, Washington, built in 2000.
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 | — |
| Electricity | 928,478 kWh |
| Gross floor area | 160,141 sq ft |
| Source record | seattle:19919:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | — | — | |
| 2024 | 95 | -2 | 29.2 kBtu/ft² | 23 tCO₂e |
| 2023 | 97 | -1 | 20.5 kBtu/ft² | 25 tCO₂e |
| 2022 | 98 | +1 | 20.6 kBtu/ft² | 27 tCO₂e |
| 2021 | 97 | ±0 | 20.9 kBtu/ft² | 28 tCO₂e |
| 2020 | 97 | -1 | 26.7 kBtu/ft² | 19 tCO₂e |
| 2019 | 98 | +13 | 25.0 kBtu/ft² | 17 tCO₂e |
| 2018 | 85 | +9 | 26.5 kBtu/ft² | 20 tCO₂e |
| 2017 | 76 | +2 | 28.9 kBtu/ft² | 22 tCO₂e |
| 2016 | 74 | -6 | 27.2 kBtu/ft² | 21 tCO₂e |
| 2015 | 80 | 25.7 kBtu/ft² | 20 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
- 400 WALL ST
- City
- Seattle
- State
- Washington
- ZIP
- 98121
- Coordinates
- 47.61706, -122.34624
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Sidney 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 160,141 sq ft, it is about 85% above the average floor area of 86,468 sq ft for those buildings. It was built in 2000, 17 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.
How has Sidney Apartments's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Sidney Apartments, covering report years 2015–2025. Its ENERGY STAR score went from 80 in 2015 to 95 in 2024 (+15 points); its best year on file was 2019, at 98. Site EUI moved from 25.7 kBtu/ft² (2015) to 29.2 kBtu/ft² (2024), an 14% increase. Reported emissions went from 20 tCO₂e to 23 tCO₂e over the same span (up 16%).
Which law requires Sidney Apartments to report its energy use?
Sidney 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:19919:2025). 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
- Hobson Place Campus· 160,028 sq ft · score 87 (A)
- Morrison· 159,840 sq ft · score 48 (D)
- Lock Vista Apts· 159,820 sq ft · score 99 (A)
- Theory U District· 159,441 sq ft · score 100 (A)
- Lane Apartments- West Building· 158,544 sq ft · score 100 (A)
- Stonehedge Apartments· 158,180 sq ft · score 97 (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 Sidney Apartments's energy grade?
Sidney Apartments did not report an ENERGY STAR score in its 2025 disclosure.
How much energy does Sidney Apartments use?
No energy-use intensity was reported for 2025.
What are Sidney Apartments's carbon emissions?
No greenhouse-gas emissions figure was reported for 2025.
Where is Sidney Apartments?
Sidney Apartments is at 400 WALL ST, in Seattle, Washington 98121. Its coordinates are 47.61706, -122.34624 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Sidney Apartments and when was it built?
Sidney Apartments has 160,141 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2000 as its year built. It is classed as multifamily housing.
Is Sidney 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, “Sidney Apartments, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/sidney-apartments-d4ec518e (data as of October 2, 2026).