Twin Creek (Tw123)
Multifamily Housing in California, CA · 1111 James Donlon Boulevard, Antioch · 94509
At a glance
Twin Creek (Tw123) is a 204,838-square-foot multifamily housing building at 1111 James Donlon Boulevard, Antioch in Antioch, California, built in 1986. In its 2023 California benchmarking disclosure it reported an ENERGY STAR score of 73 out of 100 (grade B), a site energy-use intensity of 44.6 kBtu/ft² and 563 tCO₂e of greenhouse-gas emissions. That score is higher than 25% of the 9,612 scored multifamily housing buildings in California.
AB 802 (Public Resources Code §25402.10) · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 73 (band B) |
| Site EUI | 44.6 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 563 tCO₂e |
| GHG intensity | 2.7 kgCO₂e/ft² |
| Electricity | 1,103,514 kWh |
| Natural gas | 55,670 therms |
| Gross floor area | 204,838 sq ft |
| Source record | california:6781515:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 73 | +15 | 44.6 kBtu/ft² | 563 tCO₂e |
| 2022 | 58 | +12 | 46.4 kBtu/ft² | 585 tCO₂e |
| 2021 | 46 | ±0 | 52.6 kBtu/ft² | 604 tCO₂e |
| 2020 | 46 | -10 | 53.1 kBtu/ft² | 653 tCO₂e |
| 2019 | 56 | 49.5 kBtu/ft² | 624 tCO₂e |
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
- 1111 James Donlon Boulevard, Antioch
- City
- California
- State
- California
- ZIP
- 94509
- Coordinates
- 37.98186, -121.82608
Within ~1 km
Nearby benchmarked buildings
- Tabora Gardens: Tabora Gardensscore 96
Multifamily Housing · 64,222 sq ft
See also: most efficient in California · biggest emitters
How does Twin Creek (Tw123) 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. Twin Creek (Tw123)'s ENERGY STAR score of 73 compares with an average of 82 across the 9,612 that report a score; it scores higher than 25% of them and lower than 74%. Its site EUI of 44.6 kBtu/ft² is about 30% 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 2.7 kgCO₂e/ft² is about 29% above the group average of 2.1 kgCO₂e/ft².
At 204,838 sq ft, it is about 36% above the average floor area of 150,919 sq ft for those buildings. Its 1986 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.
How has Twin Creek (Tw123)'s energy performance changed over time?
BuildingCensus holds 5 California disclosures for Twin Creek (Tw123), covering report years 2019–2023. Its ENERGY STAR score went from 56 in 2019 to 73 in 2023 (+17 points). Site EUI moved from 49.5 kBtu/ft² (2019) to 44.6 kBtu/ft² (2023), a 10% decrease. Reported emissions went from 624 tCO₂e to 563 tCO₂e over the same span (down 10%).
What does an ENERGY STAR score of 73 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 73 means the building performs better than about 73% of its national peers. BuildingCensus bands the score into report-card grades; 73 falls in band B — above median (70–84). It sits 2 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. Twin Creek (Tw123)'s 44.6 kBtu/ft² across 204,838 sq ft works out to about 9.1 billion Btu (2,677 MWh-equivalent) in 2023. The disclosure also reports 1,103,514 kWh of electricity and 55,670 therms of natural gas for the year.
Which law requires Twin Creek (Tw123) to report its energy use?
Twin Creek (Tw123) 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 2023 disclosure (source record california:6781515:2023). 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
- Overture San Marcos· 204,726 sq ft · score 90 (A)
- Sterling 5Th Street (St114)· 204,600 sq ft · score 96 (A)
- 4550 Montair Ave, Long Beach, Ca 90808, Usa· 204,552 sq ft · score 100 (A)
- 130 Stockton Ave· 204,546 sq ft · score 100 (A)
- The Huntington - Essex (Hn121)· 204,537 sq ft · score 68 (C)
- 6Ten Weddell (Dt47)· 204,474 sq ft · score 95 (A)
- 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 Twin Creek (Tw123)'s energy grade?
Twin Creek (Tw123) scores 73 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2023 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Twin Creek (Tw123) use?
Its 2023 site energy-use intensity was 44.6 kBtu/ft² across 204,838 sq ft, including 1,103,514 kWh of electricity and 55,670 therms of natural gas.
What are Twin Creek (Tw123)'s carbon emissions?
Twin Creek (Tw123) reported 563 tCO₂e of greenhouse-gas emissions (2.7 kgCO₂e/ft²) for 2023.
Where is Twin Creek (Tw123)?
Twin Creek (Tw123) is at 1111 James Donlon Boulevard, Antioch, in Antioch, California 94509. Its coordinates are 37.98186, -121.82608 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Twin Creek (Tw123) and when was it built?
Twin Creek (Tw123) has 204,838 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1986 as its year built. It is classed as multifamily housing.
Is Twin Creek (Tw123) covered by AB 802 (Public Resources Code §25402.10)?
Yes — it appears in the 2023 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, “Twin Creek (Tw123), Antioch, California — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/california/twin-creek-tw123-0ec491f5 (data as of July 9, 2026).