Winchester Plaza Garden Offices (Wn100)
Office in California, CA · 1101 South Winchester Boulevard, San Jose · 95128
At a glance
Winchester Plaza Garden Offices (Wn100) is a 120,628-square-foot office building at 1101 South Winchester Boulevard, San Jose in San Jose, California, built in 1974. In its 2024 California benchmarking disclosure it reported a site energy-use intensity of 44.8 kBtu/ft² and 297 tCO₂e of greenhouse-gas emissions.
AB 802 (Public Resources Code §25402.10) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 44.8 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 297 tCO₂e |
| GHG intensity | 2.5 kgCO₂e/ft² |
| Electricity | 693,527 kWh |
| Gross floor area | 120,628 sq ft |
| Source record | california:16741508:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 44.8 kBtu/ft² | 297 tCO₂e | |
| 2023 | — | 41.1 kBtu/ft² | 325 tCO₂e | |
| 2022 | — | 44.7 kBtu/ft² | 346 tCO₂e | |
| 2021 | — | 43.3 kBtu/ft² | 314 tCO₂e | |
| 2020 | — | 47.7 kBtu/ft² | 346 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
- 1101 South Winchester Boulevard, San Jose
- City
- California
- State
- California
- ZIP
- 95128
- Coordinates
- 37.32336, -121.95031
Within ~1 km
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See also: most efficient in California · biggest emitters
How does Winchester Plaza Garden Offices (Wn100) compare with other office buildings in California?
The latest disclosures cover 6,214 office buildings in California, out of 40,029 buildings citywide. Its site EUI of 44.8 kBtu/ft² is about 21% 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 2.5 kgCO₂e/ft² is about 32% below the group average of 3.6 kgCO₂e/ft².
At 120,628 sq ft, it is about 21% below the average floor area of 151,937 sq ft for those buildings. It was built in 1974, 11 years earlier 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 Winchester Plaza Garden Offices (Wn100)'s energy performance changed over time?
BuildingCensus holds 5 California disclosures for Winchester Plaza Garden Offices (Wn100), covering report years 2020–2024. Site EUI moved from 47.7 kBtu/ft² (2020) to 44.8 kBtu/ft² (2024), a 6% decrease. Reported emissions went from 346 tCO₂e to 297 tCO₂e over the same span (down 14%).
What does a site EUI of 44.8 kBtu/ft² mean?
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. Winchester Plaza Garden Offices (Wn100)'s 44.8 kBtu/ft² across 120,628 sq ft works out to about 5.4 billion Btu (1,584 MWh-equivalent) in 2024. The disclosure also reports 693,527 kWh of electricity for the year.
Which law requires Winchester Plaza Garden Offices (Wn100) to report its energy use?
Winchester Plaza Garden Offices (Wn100) 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:16741508:2024). 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 Winchester Plaza Garden Offices (Wn100)'s energy grade?
Winchester Plaza Garden Offices (Wn100) did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 44.8 kBtu/ft².
How much energy does Winchester Plaza Garden Offices (Wn100) use?
Its 2024 site energy-use intensity was 44.8 kBtu/ft² across 120,628 sq ft, including 693,527 kWh of electricity.
What are Winchester Plaza Garden Offices (Wn100)'s carbon emissions?
Winchester Plaza Garden Offices (Wn100) reported 297 tCO₂e of greenhouse-gas emissions (2.5 kgCO₂e/ft²) for 2024.
Where is Winchester Plaza Garden Offices (Wn100)?
Winchester Plaza Garden Offices (Wn100) is at 1101 South Winchester Boulevard, San Jose, in San Jose, California 95128. Its coordinates are 37.32336, -121.95031 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Winchester Plaza Garden Offices (Wn100) and when was it built?
Winchester Plaza Garden Offices (Wn100) has 120,628 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1974 as its year built. It is classed as office.
Is Winchester Plaza Garden Offices (Wn100) 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, “Winchester Plaza Garden Offices (Wn100), San Jose, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/winchester-plaza-garden-offices-wn100-12671a8f (data as of July 9, 2026).