Z431615 - Sunnyvale Bldg. I-640
Office in California, CA · 640 West California Avenue, Sunnyvale · 94086
At a glance
Z431615 - Sunnyvale Bldg. I-640 is a 58,908-square-foot office building at 640 West California Avenue, Sunnyvale in Sunnyvale, California, built in 1996. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 93 out of 100 (grade A), a site energy-use intensity of 47.0 kBtu/ft² and 161 tCO₂e of greenhouse-gas emissions. That score is higher than 72% of the 4,912 scored office buildings in California.
AB 802 (Public Resources Code §25402.10) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 93 (band A) |
| Site EUI | 47.0 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 161 tCO₂e |
| GHG intensity | 2.7 kgCO₂e/ft² |
| Electricity | 480,217 kWh |
| Natural gas | 9,898 therms |
| Gross floor area | 58,908 sq ft |
| Source record | california:1978332:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 93 | -3 | 47.0 kBtu/ft² | 161 tCO₂e |
| 2023 | 96 | +5 | 41.7 kBtu/ft² | 168 tCO₂e |
| 2022 | 91 | -3 | 45.5 kBtu/ft² | 181 tCO₂e |
| 2021 | 94 | -1 | 40.9 kBtu/ft² | 150 tCO₂e |
| 2020 | 95 | +6 | 43.8 kBtu/ft² | 165 tCO₂e |
| 2018 | 89 | 76.7 kBtu/ft² | 298 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.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 640 West California Avenue, Sunnyvale
- City
- California
- State
- California
- ZIP
- 94086
- Coordinates
- 37.38216, -122.03633
Within ~1 km
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See also: most efficient in California · biggest emitters
How does Z431615 - Sunnyvale Bldg. I-640 compare with other office buildings in California?
The latest disclosures cover 6,214 office buildings in California, out of 40,029 buildings citywide. Z431615 - Sunnyvale Bldg. I-640's ENERGY STAR score of 93 compares with an average of 75 across the 4,912 that report a score; it scores higher than 72% of them and lower than 25%. Its site EUI of 47.0 kBtu/ft² is about 17% below the average of 56.4 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 2.7 kgCO₂e/ft² is about 24% below the group average of 3.6 kgCO₂e/ft².
At 58,908 sq ft, it is about 61% below the average floor area of 151,937 sq ft for those buildings. It was built in 1996, 11 years later than the group's average year built (1985). Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
How has Z431615 - Sunnyvale Bldg. I-640's energy performance changed over time?
BuildingCensus holds 6 California disclosures for Z431615 - Sunnyvale Bldg. I-640, covering report years 2018, 2020, 2021, 2022, 2023, 2024. Its ENERGY STAR score went from 89 in 2018 to 93 in 2024 (+4 points); its best year on file was 2023, at 96. Site EUI moved from 76.7 kBtu/ft² (2018) to 47.0 kBtu/ft² (2024), a 39% decrease. Reported emissions went from 298 tCO₂e to 161 tCO₂e over the same span (down 46%).
What does an ENERGY STAR score of 93 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 93 means the building performs better than about 93% of its national peers. BuildingCensus bands the score into report-card grades; 93 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. Z431615 - Sunnyvale Bldg. I-640's 47.0 kBtu/ft² across 58,908 sq ft works out to about 2.8 billion Btu (811 MWh-equivalent) in 2024. The disclosure also reports 480,217 kWh of electricity and 9,898 therms of natural gas for the year.
Which law requires Z431615 - Sunnyvale Bldg. I-640 to report its energy use?
Z431615 - Sunnyvale Bldg. I-640 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:1978332:2024). 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.
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- Office buildings in California· 6,214 benchmarked
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- Most efficient large buildings in California
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- Biggest emitters in California
Frequently asked questions
What is Z431615 - Sunnyvale Bldg. I-640's energy grade?
Z431615 - Sunnyvale Bldg. I-640 scores 93 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2024 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Z431615 - Sunnyvale Bldg. I-640 use?
Its 2024 site energy-use intensity was 47.0 kBtu/ft² across 58,908 sq ft, including 480,217 kWh of electricity and 9,898 therms of natural gas.
What are Z431615 - Sunnyvale Bldg. I-640's carbon emissions?
Z431615 - Sunnyvale Bldg. I-640 reported 161 tCO₂e of greenhouse-gas emissions (2.7 kgCO₂e/ft²) for 2024.
Where is Z431615 - Sunnyvale Bldg. I-640?
Z431615 - Sunnyvale Bldg. I-640 is at 640 West California Avenue, Sunnyvale, in Sunnyvale, California 94086. Its coordinates are 37.38216, -122.03633 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Z431615 - Sunnyvale Bldg. I-640 and when was it built?
Z431615 - Sunnyvale Bldg. I-640 has 58,908 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1996 as its year built. It is classed as office.
Is Z431615 - Sunnyvale Bldg. I-640 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, “Z431615 - Sunnyvale Bldg. I-640, Sunnyvale, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/z431615-sunnyvale-bldg-i-640-98f9f55b (data as of July 9, 2026).