Brookside Oaks - Essex (Br758)
Multifamily Housing in California, CA · 1651 Belleville Way, Sunnyvale · 94087
At a glance
Brookside Oaks - Essex (Br758) is a 124,060-square-foot multifamily housing building at 1651 Belleville Way, Sunnyvale in Sunnyvale, California, built in 1973. In its 2023 California benchmarking disclosure it reported an ENERGY STAR score of 86 out of 100 (grade A), a site energy-use intensity of 37.5 kBtu/ft² and 291 tCO₂e of greenhouse-gas emissions. That score is higher than 40% 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 | 86 (band A) |
| Site EUI | 37.5 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 291 tCO₂e |
| GHG intensity | 2.3 kgCO₂e/ft² |
| Electricity | 566,531 kWh |
| Natural gas | 29,046 therms |
| Gross floor area | 124,060 sq ft |
| Source record | california:6792627:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 86 | +3 | 37.5 kBtu/ft² | 291 tCO₂e |
| 2022 | 83 | +7 | 38.6 kBtu/ft² | 301 tCO₂e |
| 2021 | 76 | -5 | 41.5 kBtu/ft² | 302 tCO₂e |
| 2020 | 81 | -1 | 39.1 kBtu/ft² | 298 tCO₂e |
| 2019 | 82 | 39.8 kBtu/ft² | 310 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
- 1651 Belleville Way, Sunnyvale
- City
- California
- State
- California
- ZIP
- 94087
- Coordinates
- 37.33929, -122.06117
Within ~1 km
Nearby benchmarked buildings
No other benchmarked buildings within ~1 km.
See also: most efficient in California · biggest emitters
How does Brookside Oaks - Essex (Br758) 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. Brookside Oaks - Essex (Br758)'s ENERGY STAR score of 86 compares with an average of 82 across the 9,612 that report a score; it scores higher than 40% of them and lower than 58%. Its site EUI of 37.5 kBtu/ft² is roughly in line with the average of 34.4 kBtu/ft². Its emissions intensity of 2.3 kgCO₂e/ft² is roughly in line with the group average of 2.1 kgCO₂e/ft².
At 124,060 sq ft, it is about 18% below the average floor area of 150,919 sq ft for those buildings. It was built in 1973, 15 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.
How has Brookside Oaks - Essex (Br758)'s energy performance changed over time?
BuildingCensus holds 5 California disclosures for Brookside Oaks - Essex (Br758), covering report years 2019–2023. Its ENERGY STAR score went from 82 in 2019 to 86 in 2023 (+4 points). Site EUI moved from 39.8 kBtu/ft² (2019) to 37.5 kBtu/ft² (2023), a 6% decrease. Reported emissions went from 310 tCO₂e to 291 tCO₂e over the same span (down 6%).
What does an ENERGY STAR score of 86 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 86 means the building performs better than about 86% of its national peers. BuildingCensus bands the score into report-card grades; 86 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 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. Brookside Oaks - Essex (Br758)'s 37.5 kBtu/ft² across 124,060 sq ft works out to about 4.7 billion Btu (1,363 MWh-equivalent) in 2023. The disclosure also reports 566,531 kWh of electricity and 29,046 therms of natural gas for the year.
Which law requires Brookside Oaks - Essex (Br758) to report its energy use?
Brookside Oaks - Essex (Br758) 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:6792627:2023). 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.
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- Multifamily Housing buildings in California· 10,630 benchmarked
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Frequently asked questions
What is Brookside Oaks - Essex (Br758)'s energy grade?
Brookside Oaks - Essex (Br758) scores 86 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2023 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Brookside Oaks - Essex (Br758) use?
Its 2023 site energy-use intensity was 37.5 kBtu/ft² across 124,060 sq ft, including 566,531 kWh of electricity and 29,046 therms of natural gas.
What are Brookside Oaks - Essex (Br758)'s carbon emissions?
Brookside Oaks - Essex (Br758) reported 291 tCO₂e of greenhouse-gas emissions (2.3 kgCO₂e/ft²) for 2023.
Where is Brookside Oaks - Essex (Br758)?
Brookside Oaks - Essex (Br758) is at 1651 Belleville Way, Sunnyvale, in Sunnyvale, California 94087. Its coordinates are 37.33929, -122.06117 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Brookside Oaks - Essex (Br758) and when was it built?
Brookside Oaks - Essex (Br758) has 124,060 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1973 as its year built. It is classed as multifamily housing.
Is Brookside Oaks - Essex (Br758) 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, “Brookside Oaks - Essex (Br758), Sunnyvale, California — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/california/brookside-oaks-essex-br758-747ab7af (data as of July 9, 2026).