Patricia K. Apartments
Multifamily Housing in Seattle, WA · 329 23RD AVE S · 98144
At a glance
Patricia K. Apartments is a 99,523-square-foot multifamily housing building at 329 23RD AVE S in Seattle, Washington, built in 2019. In its 2025 Seattle benchmarking disclosure it reported an ENERGY STAR score of 91 out of 100 (grade A), a site energy-use intensity of 37.7 kBtu/ft² and 15 tCO₂e of greenhouse-gas emissions. That score is higher than 49% of the 1,652 scored multifamily housing buildings in Seattle.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 91 (band A) |
| Site EUI | 37.7 kBtu/ft² |
| Source EUI | 79.9 kBtu/ft² |
| GHG emissions | 15 tCO₂e |
| GHG intensity | 0.1 kgCO₂e/ft² |
| Electricity | 750,231 kWh |
| Natural gas | 16,380 therms |
| Gross floor area | 99,523 sq ft |
| Source record | seattle:50936:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 91 | +7 | 37.7 kBtu/ft² | 15 tCO₂e |
| 2024 | 84 | +1 | 42.0 kBtu/ft² | 120 tCO₂e |
| 2023 | 83 | 43.3 kBtu/ft² | 124 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
- 329 23RD AVE S
- City
- Seattle
- State
- Washington
- ZIP
- 98144
- Coordinates
- 47.59965, -122.30256
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Patricia K. 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. Patricia K. Apartments's ENERGY STAR score of 91 compares with an average of 83 across the 1,652 that report a score; it scores higher than 49% of them and lower than 48%. Its site EUI of 37.7 kBtu/ft² is roughly in line with the average of 34.9 kBtu/ft². Its emissions intensity of 0.1 kgCO₂e/ft² is about 81% below the group average of 0.7 kgCO₂e/ft².
At 99,523 sq ft, it is about 15% above the average floor area of 86,468 sq ft for those buildings. It was built in 2019, 36 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 Patricia K. Apartments's energy performance changed over time?
BuildingCensus holds 3 Seattle disclosures for Patricia K. Apartments, covering report years 2023–2025. Its ENERGY STAR score went from 83 in 2023 to 91 in 2025 (+8 points). Site EUI moved from 43.3 kBtu/ft² (2023) to 37.7 kBtu/ft² (2025), a 13% decrease. Reported emissions went from 124 tCO₂e to 15 tCO₂e over the same span (down 88%).
What does an ENERGY STAR score of 91 mean?
ENERGY STAR scores run from 1 to 100 and are computed by the EPA's Portfolio Manager as a percentile against similar buildings nationwide, adjusted for climate, size and use: a score of 91 means the building performs better than about 91% of its national peers. BuildingCensus bands the score into report-card grades; 91 falls in band A — high performer (85–100). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. In Seattle, 69% of scored buildings are at 75 or above.
Site energy-use intensity (EUI) is the energy a building uses on site in a year divided by its floor area, in thousand Btu per square foot — lower is more efficient. Patricia K. Apartments's 37.7 kBtu/ft² across 99,523 sq ft works out to about 3.8 billion Btu (1,100 MWh-equivalent) in 2025. Its source EUI of 79.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 750,231 kWh of electricity and 16,380 therms of natural gas for the year.
Which law requires Patricia K. Apartments to report its energy use?
Patricia K. 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:50936:2025). 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
- The Towers On Greenwood· 98,486 sq ft · EUI 28.6 kBtu/ft²
- Stewart Court· 98,222 sq ft · score 85 (A)
- Kawabe Memorial House· 97,978 sq ft · score 75 (B)
- Commodore Duchess Apts (Uw Housing)· 97,923 sq ft
- Lumen Condo· 97,855 sq ft · score 99 (A)
- Metropolitan Park Apartments· 97,737 sq ft · score 96 (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 Patricia K. Apartments's energy grade?
Patricia K. Apartments scores 91 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 Patricia K. Apartments use?
Its 2025 site energy-use intensity was 37.7 kBtu/ft² (79.9 kBtu/ft² source) across 99,523 sq ft, including 750,231 kWh of electricity and 16,380 therms of natural gas.
What are Patricia K. Apartments's carbon emissions?
Patricia K. Apartments reported 15 tCO₂e of greenhouse-gas emissions (0.1 kgCO₂e/ft²) for 2025.
Where is Patricia K. Apartments?
Patricia K. Apartments is at 329 23RD AVE S, in Seattle, Washington 98144. Its coordinates are 47.59965, -122.30256 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Patricia K. Apartments and when was it built?
Patricia K. Apartments has 99,523 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2019 as its year built. It is classed as multifamily housing.
Is Patricia K. 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, “Patricia K. Apartments, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/patricia-k-apartments-e5a8a7ab (data as of October 2, 2026).