301 Island Parkway
Office in California, CA · 301 Island Parkway, Belmont · 94002
At a glance
301 Island Parkway is a 42,513-square-foot office building at 301 Island Parkway, Belmont in Belmont, California, built in 1990. In its 2023 California benchmarking disclosure it reported an ENERGY STAR score of 100 out of 100 (grade A), a site energy-use intensity of 15.1 kBtu/ft² and 45 tCO₂e of greenhouse-gas emissions. That score is higher than 91% 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 | 100 (band A) |
| Site EUI | 15.1 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 45 tCO₂e |
| GHG intensity | 1.1 kgCO₂e/ft² |
| Electricity | 187,491 kWh |
| Natural gas | 2 therms |
| Gross floor area | 42,513 sq ft |
| Source record | california:4299091:2023 |
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
- 301 Island Parkway, Belmont
- City
- California
- State
- California
- ZIP
- 94002
- Coordinates
- 37.53132, -122.26964
Within ~1 km
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See also: most efficient in California · biggest emitters
How does 301 Island Parkway compare with other office buildings in California?
The latest disclosures cover 6,214 office buildings in California, out of 40,029 buildings citywide. 301 Island Parkway's ENERGY STAR score of 100 compares with an average of 75 across the 4,912 that report a score; it scores higher than 91% of them. Its site EUI of 15.1 kBtu/ft² is about 73% 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 1.1 kgCO₂e/ft² is about 69% below the group average of 3.6 kgCO₂e/ft².
At 42,513 sq ft, it is about 72% below the average floor area of 151,937 sq ft for those buildings. It was built in 1990, 5 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.
What does an ENERGY STAR score of 100 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: 100 is the top of the scale. BuildingCensus bands the score into report-card grades; 100 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. 301 Island Parkway's 15.1 kBtu/ft² across 42,513 sq ft works out to about 0.6 billion Btu (188 MWh-equivalent) in 2023. The disclosure also reports 187,491 kWh of electricity and 2 therms of natural gas for the year.
Which law requires 301 Island Parkway to report its energy use?
301 Island Parkway 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:4299091:2023). 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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- Office buildings in California· 6,214 benchmarked
- All California benchmarked buildings· AB 802 (Public Resources Code §25402.10)
- Most efficient large buildings in California
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- Biggest emitters in California
Frequently asked questions
What is 301 Island Parkway's energy grade?
301 Island Parkway scores 100 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 301 Island Parkway use?
Its 2023 site energy-use intensity was 15.1 kBtu/ft² across 42,513 sq ft, including 187,491 kWh of electricity and 2 therms of natural gas.
What are 301 Island Parkway's carbon emissions?
301 Island Parkway reported 45 tCO₂e of greenhouse-gas emissions (1.1 kgCO₂e/ft²) for 2023.
Where is 301 Island Parkway?
301 Island Parkway is at 301 Island Parkway, Belmont, in Belmont, California 94002. Its coordinates are 37.53132, -122.26964 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is 301 Island Parkway and when was it built?
301 Island Parkway has 42,513 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1990 as its year built. It is classed as office.
Is 301 Island Parkway 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, “301 Island Parkway, Belmont, California — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/california/301-island-parkway-19c2bb8b (data as of July 9, 2026).