2450 Walsh Ave - Opi
Office in California, CA · 2450 Walsh Avenue, Santa Clara · 95051
At a glance
2450 Walsh Ave - Opi is a 65,840-square-foot office building at 2450 Walsh Avenue, Santa Clara in Santa Clara, California, built in 1981. In its 2023 California benchmarking disclosure it reported an ENERGY STAR score of 4 out of 100 (grade D), a site energy-use intensity of 133.3 kBtu/ft² and 570 tCO₂e of greenhouse-gas emissions. That score is higher than 3% of the 4,912 scored office buildings in California.
AB 802 (Public Resources Code §25402.10) · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 4 (band D) |
| Site EUI | 133.3 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 570 tCO₂e |
| GHG intensity | 8.6 kgCO₂e/ft² |
| Electricity | 2,177,711 kWh |
| Natural gas | 14,381 therms |
| Gross floor area | 65,840 sq ft |
| Source record | california:6368044:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 4 | 133.3 kBtu/ft² | 570 tCO₂e | |
| 2022 | — | — | — | |
| 2021 | — | — | — | |
| 2020 | — | — | — | |
| 2019 | — | — | — | |
| 2018 | 1 | 196.7 kBtu/ft² | 883 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
- 2450 Walsh Avenue, Santa Clara
- City
- California
- State
- California
- ZIP
- 95051
- Coordinates
- 37.36934, -121.97104
Within ~1 km
Nearby benchmarked buildings
- Voyagerscore 43
Office · 750,000 sq ft
- Endeavorscore 78
Office · 507,500 sq ft
- 2260 Lawsonscore —
Parking · 427,137 sq ft
- Ca1score —
Data Center · 342,797 sq ft
- 2250 Lawson Lanescore 99
Office · 268,556 sq ft
- Coresite Sv7score —
Data Center · 231,000 sq ft
See also: most efficient in California · biggest emitters
How does 2450 Walsh Ave - Opi compare with other office buildings in California?
The latest disclosures cover 6,214 office buildings in California, out of 40,029 buildings citywide. 2450 Walsh Ave - Opi's ENERGY STAR score of 4 compares with an average of 75 across the 4,912 that report a score; it scores higher than 3% of them and lower than 96%. Its site EUI of 133.3 kBtu/ft² is about 136% above the average of 56.4 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 8.6 kgCO₂e/ft² is about 139% above the group average of 3.6 kgCO₂e/ft².
At 65,840 sq ft, it is about 57% below the average floor area of 151,937 sq ft for those buildings. It was built in 1981, 4 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 2450 Walsh Ave - Opi's energy performance changed over time?
BuildingCensus holds 6 California disclosures for 2450 Walsh Ave - Opi, covering report years 2018–2023. Its ENERGY STAR score went from 1 in 2018 to 4 in 2023 (+3 points). Site EUI moved from 196.7 kBtu/ft² (2018) to 133.3 kBtu/ft² (2023), a 32% decrease. Reported emissions went from 883 tCO₂e to 570 tCO₂e over the same span (down 36%).
What does an ENERGY STAR score of 4 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 4 means the building performs better than about 4% of its national peers. BuildingCensus bands the score into report-card grades; 4 falls in band D — lowest band (1–54). It sits 71 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. 2450 Walsh Ave - Opi's 133.3 kBtu/ft² across 65,840 sq ft works out to about 8.8 billion Btu (2,572 MWh-equivalent) in 2023. The disclosure also reports 2,177,711 kWh of electricity and 14,381 therms of natural gas for the year.
Which law requires 2450 Walsh Ave - Opi to report its energy use?
2450 Walsh Ave - Opi 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:6368044:2023). 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 office buildings in California
- 4045-4055 Campbell Ave· 65,839 sq ft · score 70 (B)
- Peninsula Life Science Center· 65,804 sq ft · score 17 (D)
- Plaza Del Rio· 65,796 sq ft · score 97 (A)
- 31051 Agoura Road· 65,770 sq ft · score 68 (C)
- Torrey Pines Center North· 65,760 sq ft · EUI 57.9 kBtu/ft²
- 5353 Mission Center· 65,721 sq ft · score 81 (B)
- Office buildings in California· 6,214 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 2450 Walsh Ave - Opi's energy grade?
2450 Walsh Ave - Opi scores 4 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2023 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 2450 Walsh Ave - Opi use?
Its 2023 site energy-use intensity was 133.3 kBtu/ft² across 65,840 sq ft, including 2,177,711 kWh of electricity and 14,381 therms of natural gas.
What are 2450 Walsh Ave - Opi's carbon emissions?
2450 Walsh Ave - Opi reported 570 tCO₂e of greenhouse-gas emissions (8.6 kgCO₂e/ft²) for 2023.
Where is 2450 Walsh Ave - Opi?
2450 Walsh Ave - Opi is at 2450 Walsh Avenue, Santa Clara, in Santa Clara, California 95051. Its coordinates are 37.36934, -121.97104 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is 2450 Walsh Ave - Opi and when was it built?
2450 Walsh Ave - Opi has 65,840 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1981 as its year built. It is classed as office.
Is 2450 Walsh Ave - Opi 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).
Working with California building benchmarking records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “2450 Walsh Ave - Opi, Santa Clara, California — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/california/2450-walsh-ave-opi-ef894204 (data as of July 9, 2026).