501 Island Parkway
Office in California, CA · 501 Island Parkway, Redwood City · 94065
At a glance
501 Island Parkway is a 77,222-square-foot office building at 501 Island Parkway, Redwood City in Redwood City, California, built in 2000. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 100 out of 100 (grade A), a site energy-use intensity of 7.0 kBtu/ft² and 35 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 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 100 (band A) |
| Site EUI | 7.0 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 35 tCO₂e |
| GHG intensity | 0.5 kgCO₂e/ft² |
| Electricity | 156,008 kWh |
| Gross floor area | 77,222 sq ft |
| Source record | california:4297990:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 100 | ±0 | 7.0 kBtu/ft² | 35 tCO₂e |
| 2023 | 100 | ±0 | 7.1 kBtu/ft² | 38 tCO₂e |
| 2022 | 100 | — | — |
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
- 501 Island Parkway, Redwood City
- City
- California
- State
- California
- ZIP
- 94065
- Coordinates
- 37.53043, -122.26884
Within ~1 km
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See also: most efficient in California · biggest emitters
How does 501 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. 501 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 7.0 kBtu/ft² is about 88% 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 0.5 kgCO₂e/ft² is about 87% below the group average of 3.6 kgCO₂e/ft².
At 77,222 sq ft, it is about half of 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 501 Island Parkway's energy performance changed over time?
BuildingCensus holds 3 California disclosures for 501 Island Parkway, covering report years 2022–2024. Its ENERGY STAR score was 100 in both 2022 and 2024. Site EUI moved from 7.1 kBtu/ft² (2023) to 7.0 kBtu/ft² (2024), a 1% decrease. Reported emissions went from 38 tCO₂e to 35 tCO₂e over the same span (down 8%).
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. 501 Island Parkway's 7.0 kBtu/ft² across 77,222 sq ft works out to about 0.5 billion Btu (158 MWh-equivalent) in 2024. The disclosure also reports 156,008 kWh of electricity for the year.
Which law requires 501 Island Parkway to report its energy use?
501 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 2024 disclosure (source record california:4297990:2024). 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.
More office buildings in California
- Torrey Reserve - South Court I· 77,209 sq ft · score 90 (A)
- 250 Holger Way· 77,209 sq ft · score 56 (C)
- 10390 Santa Monica Blvd· 77,183 sq ft · score 45 (D)
- Cio Sorrento Mesa, Llc· 77,177 sq ft · score 1 (D)
- 8800 W. Sunset Blvd - Ab802· 77,146 sq ft · score 43 (D)
- 04380 - Madison Street Building· 77,141 sq ft · score 88 (A)
- 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 501 Island Parkway's energy grade?
501 Island Parkway scores 100 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 501 Island Parkway use?
Its 2024 site energy-use intensity was 7.0 kBtu/ft² across 77,222 sq ft, including 156,008 kWh of electricity.
What are 501 Island Parkway's carbon emissions?
501 Island Parkway reported 35 tCO₂e of greenhouse-gas emissions (0.5 kgCO₂e/ft²) for 2024.
Where is 501 Island Parkway?
501 Island Parkway is at 501 Island Parkway, Redwood City, in Redwood City, California 94065. Its coordinates are 37.53043, -122.26884 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is 501 Island Parkway and when was it built?
501 Island Parkway has 77,222 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 501 Island Parkway 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, “501 Island Parkway, Redwood City, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/501-island-parkway-9b17fac0 (data as of July 9, 2026).