Summerwood
Multifamily Housing in California, CA · 3101 Buchanan Rd, Antioch · 94509
At a glance
Summerwood is a 65,532-square-foot multifamily housing building at 3101 Buchanan Rd, Antioch in Antioch, California, built in 1988. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 51 out of 100 (grade D), a site energy-use intensity of 46.8 kBtu/ft² and 173 tCO₂e of greenhouse-gas emissions. That score is higher than 10% 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 | 51 (band D) |
| Site EUI | 46.8 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 173 tCO₂e |
| GHG intensity | 2.6 kgCO₂e/ft² |
| Electricity | 375,693 kWh |
| Natural gas | 16,615 therms |
| Gross floor area | 65,532 sq ft |
| Source record | california:32594965:2024 |
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
- 3101 Buchanan Rd, Antioch
- City
- California
- State
- California
- ZIP
- 94509
- Coordinates
- 37.99745, -121.84563
Within ~1 km
Nearby benchmarked buildings
- Somersville Towne Centerscore —
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- Hudson Townhouse Manorscore 100
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- (71331A) Antioch Ground Leasedscore 69
Retail Store · 107,140 sq ft
- Villa Medanos Apartmentsscore 99
Multifamily Housing · 91,211 sq ft
- Delta Fair Mob Campusscore 44
Medical Office · 85,093 sq ft
See also: most efficient in California · biggest emitters
How does Summerwood 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. Summerwood's ENERGY STAR score of 51 compares with an average of 82 across the 9,612 that report a score; it scores higher than 10% of them and lower than 89%. Its site EUI of 46.8 kBtu/ft² is about 36% above the average of 34.4 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 2.6 kgCO₂e/ft² is about 26% above the group average of 2.1 kgCO₂e/ft².
At 65,532 sq ft, it is about 57% below the average floor area of 150,919 sq ft for those buildings. Its 1988 construction date is close to 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 51 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 51 means the building performs better than about 51% of its national peers. BuildingCensus bands the score into report-card grades; 51 falls in band D — lowest band (1–54). It sits 24 points below 75, the threshold for ENERGY STAR certification. 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. Summerwood's 46.8 kBtu/ft² across 65,532 sq ft works out to about 3.1 billion Btu (899 MWh-equivalent) in 2024. The disclosure also reports 375,693 kWh of electricity and 16,615 therms of natural gas for the year.
Which law requires Summerwood to report its energy use?
Summerwood 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:32594965:2024). 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
- Cedar Road (Cd079)· 65,514 sq ft · score 68 (C)
- Orange Tree (Rn45)· 65,508 sq ft · score 93 (A)
- Orion Gardens Apartments· 65,500 sq ft · score 84 (B)
- 12811 Garden Grove Blvd· 65,487 sq ft · score 76 (B)
- Shadow Cove· 65,476 sq ft · score 100 (A)
- Metro Park Apartments· 65,471 sq ft · EUI 1.7 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 Summerwood's energy grade?
Summerwood scores 51 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2024 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Summerwood use?
Its 2024 site energy-use intensity was 46.8 kBtu/ft² across 65,532 sq ft, including 375,693 kWh of electricity and 16,615 therms of natural gas.
What are Summerwood's carbon emissions?
Summerwood reported 173 tCO₂e of greenhouse-gas emissions (2.6 kgCO₂e/ft²) for 2024.
Where is Summerwood?
Summerwood is at 3101 Buchanan Rd, Antioch, in Antioch, California 94509. Its coordinates are 37.99745, -121.84563 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Summerwood and when was it built?
Summerwood has 65,532 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1988 as its year built. It is classed as multifamily housing.
Is Summerwood 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, “Summerwood, Antioch, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/summerwood-23a4070f (data as of July 9, 2026).