Western Park Apartments
Mixed Residential in San Francisco, CA · 1215 ELLIS ST · 94109
At a glance
Western Park Apartments is a 134,461-square-foot mixed residential building at 1215 ELLIS ST in San Francisco, California, built in 1971. In its 2025 San Francisco benchmarking disclosure it reported an ENERGY STAR score of 37 out of 100 (grade D), a site energy-use intensity of 79.0 kBtu/ft² and 523 tCO₂e of greenhouse-gas emissions. That score is higher than 6% of the 340 scored mixed residential buildings in San Francisco.
SF Environment Code Chapter 20 · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 37 (band D) |
| Site EUI | 79.0 kBtu/ft² |
| Source EUI | 118.9 kBtu/ft² |
| GHG emissions | 523 tCO₂e |
| GHG intensity | 4.3 kgCO₂e/ft² |
| Electricity | 735,016 kWh |
| Natural gas | 71,561 therms |
| Gross floor area | 134,461 sq ft |
| Source record | sf:0735/030:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 37 | -12 | 79.0 kBtu/ft² | 523 tCO₂e |
| 2024 | 49 | 68.2 kBtu/ft² | 473 tCO₂e | |
| 2023 | — | 65.2 kBtu/ft² | 465 tCO₂e | |
| 2022 | — | 68.2 kBtu/ft² | 478 tCO₂e | |
| 2021 | — | — | — | |
| 2020 | — | 58.3 kBtu/ft² | 404 tCO₂e | |
| 2019 | — | 67.5 kBtu/ft² | 478 tCO₂e | |
| 2018 | — | — | — |
Compliance context
SF Environment Code Chapter 20
San Francisco's ordinance requires annual benchmarking for commercial buildings over 10,000 sq ft, with administrative penalties for buildings that fail to report.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 1215 ELLIS ST
- City
- San Francisco
- State
- California
- ZIP
- 94109
- Coordinates
- 37.78280, -122.42679
Within ~1 km
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See also: most efficient in San Francisco · biggest emitters
How does Western Park Apartments compare with other mixed residential buildings in San Francisco?
The latest disclosures cover 610 mixed residential buildings in San Francisco, out of 2,509 buildings citywide. Western Park Apartments's ENERGY STAR score of 37 compares with an average of 85 across the 340 that report a score; it scores higher than 6% of them and lower than 94%. Its site EUI of 79.0 kBtu/ft² is about twice the average of 36.0 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 4.3 kgCO₂e/ft² is about twice the group average of 2.0 kgCO₂e/ft².
At 134,461 sq ft, it is about 19% below the average floor area of 165,572 sq ft for those buildings. It was built in 1971, 5 years later than the group's average year built (1967).
How has Western Park Apartments's energy performance changed over time?
BuildingCensus holds 8 San Francisco disclosures for Western Park Apartments, covering report years 2018–2025. Its ENERGY STAR score went from 49 in 2024 to 37 in 2025 (-12 points); its best year on file was 2024, at 49. Site EUI moved from 67.5 kBtu/ft² (2019) to 79.0 kBtu/ft² (2025), an 17% increase. Reported emissions went from 478 tCO₂e to 523 tCO₂e over the same span (up 10%).
What does an ENERGY STAR score of 37 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 37 means the building performs better than about 37% of its national peers. BuildingCensus bands the score into report-card grades; 37 falls in band D — lowest band (1–54). It sits 38 points below 75, the threshold for ENERGY STAR certification. In San Francisco, 73% 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. Western Park Apartments's 79.0 kBtu/ft² across 134,461 sq ft works out to about 10.6 billion Btu (3,113 MWh-equivalent) in 2025. Its source EUI of 118.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 735,016 kWh of electricity and 71,561 therms of natural gas for the year.
Which law requires Western Park Apartments to report its energy use?
Western Park Apartments reports under SF Environment Code Chapter 20, the legal basis of San Francisco's Existing Buildings Energy Performance Ordinance, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2025 disclosure (source record sf:0735/030:2025). San Francisco's ordinance requires annual benchmarking for commercial buildings over 10,000 sq ft, with administrative penalties for buildings that fail to report.
More mixed residential buildings in San Francisco
- 868 WASHINGTON ST· 134,240 sq ft
- 1835 FRANKLIN ST· 133,340 sq ft
- 345 ARBALLO DR· 133,012 sq ft
- 1090 CHESTNUT ST· 132,856 sq ft · EUI 31.1 kBtu/ft²
- 733 FRONT ST· 132,651 sq ft · EUI 17.3 kBtu/ft²
- 5285 DIAMOND HEIGHTS BLVD· 131,854 sq ft · score 72 (B)
- Mixed Residential buildings in San Francisco· 610 benchmarked
- All San Francisco benchmarked buildings· SF Environment Code Chapter 20
- Most efficient large buildings in San Francisco
- Least efficient large buildings in San Francisco
- Biggest emitters in San Francisco
Frequently asked questions
What is Western Park Apartments's energy grade?
Western Park Apartments scores 37 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2025 San Francisco disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Western Park Apartments use?
Its 2025 site energy-use intensity was 79.0 kBtu/ft² (118.9 kBtu/ft² source) across 134,461 sq ft, including 735,016 kWh of electricity and 71,561 therms of natural gas.
What are Western Park Apartments's carbon emissions?
Western Park Apartments reported 523 tCO₂e of greenhouse-gas emissions (4.3 kgCO₂e/ft²) for 2025.
Where is Western Park Apartments?
Western Park Apartments is at 1215 ELLIS ST, in San Francisco, California 94109. Its coordinates are 37.78280, -122.42679 (latitude, longitude), as published in the Existing Buildings Energy Performance Ordinance file.
How big is Western Park Apartments and when was it built?
Western Park Apartments has 134,461 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1971 as its year built. It is classed as mixed residential.
Is Western Park Apartments covered by SF Environment Code Chapter 20?
Yes — it appears in the 2025 Existing Buildings Energy Performance Ordinance disclosure, which lists the buildings reporting under SF Environment Code Chapter 20.
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About this data
Source: Existing Buildings Energy Performance Ordinance (SF Environment Code Chapter 20), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Western Park Apartments, San Francisco, California — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/san-francisco/western-park-apartments-f572bc50 (data as of October 2, 2026).