Z431617 - Sunnyvale Bldg. K-840
Office in California, CA · 840 West California Avenue, Sunnyvale · 94086
At a glance
Z431617 - Sunnyvale Bldg. K-840 is a 59,000-square-foot office building at 840 West California Avenue, Sunnyvale in Sunnyvale, California, built in 2000. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 98 out of 100 (grade A), a site energy-use intensity of 51.3 kBtu/ft² and 169 tCO₂e of greenhouse-gas emissions. That score is higher than 85% 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 | 98 (band A) |
| Site EUI | 51.3 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 169 tCO₂e |
| GHG intensity | 2.9 kgCO₂e/ft² |
| Electricity | 461,736 kWh |
| Natural gas | 12,056 therms |
| Gross floor area | 59,000 sq ft |
| Source record | california:1979435:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 98 | -1 | 51.3 kBtu/ft² | 169 tCO₂e |
| 2023 | 99 | +33 | 38.2 kBtu/ft² | 144 tCO₂e |
| 2022 | 66 | +28 | — | 260 tCO₂e |
| 2021 | 38 | -19 | — | 322 tCO₂e |
| 2020 | 57 | -39 | 141.0 kBtu/ft² | 484 tCO₂e |
| 2018 | 96 | 55.2 kBtu/ft² | 200 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
- 840 West California Avenue, Sunnyvale
- City
- California
- State
- California
- ZIP
- 94086
- Coordinates
- 37.38158, -122.03789
Within ~1 km
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See also: most efficient in California · biggest emitters
How does Z431617 - Sunnyvale Bldg. K-840 compare with other office buildings in California?
The latest disclosures cover 6,214 office buildings in California, out of 40,029 buildings citywide. Z431617 - Sunnyvale Bldg. K-840's ENERGY STAR score of 98 compares with an average of 75 across the 4,912 that report a score; it scores higher than 85% of them and lower than 12%. Its site EUI of 51.3 kBtu/ft² is roughly in line with 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 2.9 kgCO₂e/ft² is about 21% below the group average of 3.6 kgCO₂e/ft².
At 59,000 sq ft, it is about 61% below the average floor area of 151,937 sq ft for those buildings. It was built in 2000, 15 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 Z431617 - Sunnyvale Bldg. K-840's energy performance changed over time?
BuildingCensus holds 6 California disclosures for Z431617 - Sunnyvale Bldg. K-840, covering report years 2018, 2020, 2021, 2022, 2023, 2024. Its ENERGY STAR score went from 96 in 2018 to 98 in 2024 (+2 points); its best year on file was 2023, at 99. Site EUI moved from 55.2 kBtu/ft² (2018) to 51.3 kBtu/ft² (2024), a 7% decrease. Reported emissions went from 200 tCO₂e to 169 tCO₂e over the same span (down 16%).
What does an ENERGY STAR score of 98 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 98 means the building performs better than about 98% of its national peers. BuildingCensus bands the score into report-card grades; 98 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. Z431617 - Sunnyvale Bldg. K-840's 51.3 kBtu/ft² across 59,000 sq ft works out to about 3 billion Btu (887 MWh-equivalent) in 2024. The disclosure also reports 461,736 kWh of electricity and 12,056 therms of natural gas for the year.
Which law requires Z431617 - Sunnyvale Bldg. K-840 to report its energy use?
Z431617 - Sunnyvale Bldg. K-840 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:1979435:2024). 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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- Most efficient large buildings in California
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Frequently asked questions
What is Z431617 - Sunnyvale Bldg. K-840's energy grade?
Z431617 - Sunnyvale Bldg. K-840 scores 98 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 Z431617 - Sunnyvale Bldg. K-840 use?
Its 2024 site energy-use intensity was 51.3 kBtu/ft² across 59,000 sq ft, including 461,736 kWh of electricity and 12,056 therms of natural gas.
What are Z431617 - Sunnyvale Bldg. K-840's carbon emissions?
Z431617 - Sunnyvale Bldg. K-840 reported 169 tCO₂e of greenhouse-gas emissions (2.9 kgCO₂e/ft²) for 2024.
Where is Z431617 - Sunnyvale Bldg. K-840?
Z431617 - Sunnyvale Bldg. K-840 is at 840 West California Avenue, Sunnyvale, in Sunnyvale, California 94086. Its coordinates are 37.38158, -122.03789 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Z431617 - Sunnyvale Bldg. K-840 and when was it built?
Z431617 - Sunnyvale Bldg. K-840 has 59,000 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2000 as its year built. It is classed as office.
Is Z431617 - Sunnyvale Bldg. K-840 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, “Z431617 - Sunnyvale Bldg. K-840, Sunnyvale, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/z431617-sunnyvale-bldg-k-840-b4d62048 (data as of July 9, 2026).