15631-15691 Williams Street
Multifamily Housing in California, CA · 15631 Williams Street, Tustin · 92780
At a glance
15631-15691 Williams Street is a 89,780-square-foot multifamily housing building at 15631 Williams Street, Tustin in Tustin, California, built in 1970. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 78 out of 100 (grade B), a site energy-use intensity of 34.8 kBtu/ft² and 183 tCO₂e of greenhouse-gas emissions. That score is higher than 30% of the 9,612 scored multifamily housing buildings in California.
AB 802 (Public Resources Code §25402.10) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 78 (band B) |
| Site EUI | 34.8 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 183 tCO₂e |
| GHG intensity | 2.0 kgCO₂e/ft² |
| Electricity | 329,882 kWh |
| Natural gas | 20,403 therms |
| Gross floor area | 89,780 sq ft |
| Source record | california:58644992:2024 |
Compliance context
AB 802 (Public Resources Code §25402.10)
AB 802 requires every California commercial building over 50,000 sq ft to report energy use to the CEC annually; the CEC publicly discloses the results statewide.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 15631 Williams Street, Tustin
- City
- California
- State
- California
- ZIP
- 92780
- Coordinates
- 33.73620, -117.84085
Within ~1 km
Nearby benchmarked buildings
- Warwick Squarescore 85
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- Warwick Squarescore 9
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- 15513 Williams Stscore 100
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- Las Fuentes Apartmentsscore 96
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- Alders - Labriscore 80
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See also: most efficient in California · biggest emitters
How does 15631-15691 Williams Street compare with other multifamily housing buildings in California?
The latest disclosures cover 10,630 multifamily housing buildings in California, out of 40,029 buildings citywide. 15631-15691 Williams Street's ENERGY STAR score of 78 compares with an average of 82 across the 9,612 that report a score; it scores higher than 30% of them and lower than 69%. Its site EUI of 34.8 kBtu/ft² is roughly in line with the average of 34.4 kBtu/ft². Its emissions intensity of 2.0 kgCO₂e/ft² is roughly in line with the group average of 2.1 kgCO₂e/ft².
At 89,780 sq ft, it is about 41% below the average floor area of 150,919 sq ft for those buildings. It was built in 1970, 18 years earlier than the group's average year built (1988). 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.
What does an ENERGY STAR score of 78 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 78 means the building performs better than about 78% of its national peers. BuildingCensus bands the score into report-card grades; 78 falls in band B — above median (70–84). 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 California, 65% 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. 15631-15691 Williams Street's 34.8 kBtu/ft² across 89,780 sq ft works out to about 3.1 billion Btu (916 MWh-equivalent) in 2024. The disclosure also reports 329,882 kWh of electricity and 20,403 therms of natural gas for the year.
Which law requires 15631-15691 Williams Street to report its energy use?
15631-15691 Williams Street reports under AB 802 (Public Resources Code §25402.10), the legal basis of California's Building Energy Benchmarking Program (statewide), which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record california:58644992:2024). AB 802 requires every California commercial building over 50,000 sq ft to report energy use to the CEC annually; the CEC publicly discloses the results statewide.
More multifamily housing buildings in California
- Blue Mountain Sr Villas· 89,753 sq ft · score 94 (A)
- Ticino At Noho (Tc01)· 89,746 sq ft · score 91 (A)
- 125 Mason St· 89,680 sq ft · score 18 (D)
- Ca069_Building 5· 89,665 sq ft · score 44 (D)
- 351 Turk· 89,630 sq ft · score 96 (A)
- Olivera Senior Apartments (Ol025)· 89,605 sq ft · EUI 12.2 kBtu/ft²
- Multifamily Housing buildings in California· 10,630 benchmarked
- All California benchmarked buildings· AB 802 (Public Resources Code §25402.10)
- Most efficient large buildings in California
- Least efficient large buildings in California
- Biggest emitters in California
Frequently asked questions
What is 15631-15691 Williams Street's energy grade?
15631-15691 Williams Street scores 78 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2024 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 15631-15691 Williams Street use?
Its 2024 site energy-use intensity was 34.8 kBtu/ft² across 89,780 sq ft, including 329,882 kWh of electricity and 20,403 therms of natural gas.
What are 15631-15691 Williams Street's carbon emissions?
15631-15691 Williams Street reported 183 tCO₂e of greenhouse-gas emissions (2.0 kgCO₂e/ft²) for 2024.
Where is 15631-15691 Williams Street?
15631-15691 Williams Street is at 15631 Williams Street, Tustin, in Tustin, California 92780. Its coordinates are 33.73620, -117.84085 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is 15631-15691 Williams Street and when was it built?
15631-15691 Williams Street has 89,780 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1970 as its year built. It is classed as multifamily housing.
Is 15631-15691 Williams Street covered by AB 802 (Public Resources Code §25402.10)?
Yes — it appears in the 2024 Building Energy Benchmarking Program (statewide) disclosure, which lists the buildings reporting under AB 802 (Public Resources Code §25402.10).
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About this data
Source: Building Energy Benchmarking Program (statewide) (AB 802 (Public Resources Code §25402.10)), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “15631-15691 Williams Street, Tustin, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/15631-15691-williams-street-56315db1 (data as of July 9, 2026).