Bayside Towers Ii
Office in California, CA · 4100 East 3Rd Avenue, Foster City · 94404
At a glance
Bayside Towers Ii is a 134,033-square-foot office building at 4100 East 3Rd Avenue, Foster City in Foster City, California, built in 1999. In its 2024 California benchmarking disclosure it reported a site energy-use intensity of 76.3 kBtu/ft² and 629 tCO₂e of greenhouse-gas emissions.
AB 802 (Public Resources Code §25402.10) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 76.3 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 629 tCO₂e |
| GHG intensity | 4.7 kgCO₂e/ft² |
| Electricity | 2,046,465 kWh |
| Natural gas | 31,240 therms |
| Gross floor area | 134,033 sq ft |
| Source record | california:1405842:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 76.3 kBtu/ft² | 629 tCO₂e | |
| 2023 | — | 72.9 kBtu/ft² | 645 tCO₂e | |
| 2022 | — | 58.6 kBtu/ft² | 502 tCO₂e | |
| 2021 | — | 23.3 kBtu/ft² | 186 tCO₂e | |
| 2020 | — | 28.4 kBtu/ft² | 237 tCO₂e | |
| 2019 | — | 52.4 kBtu/ft² | 443 tCO₂e | |
| 2018 | 80 | 52.1 kBtu/ft² | 452 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
- 4100 East 3Rd Avenue, Foster City
- City
- California
- State
- California
- ZIP
- 94404
- Coordinates
- 37.57181, -122.26601
Within ~1 km
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- Bmr-500 Lincoln Centrescore —
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- Bmr-300 Lincoln Centre Drivescore —
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See also: most efficient in California · biggest emitters
How does Bayside Towers Ii 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 76.3 kBtu/ft² is about 35% 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 4.7 kgCO₂e/ft² is about 31% above the group average of 3.6 kgCO₂e/ft².
At 134,033 sq ft, it is about 12% below the average floor area of 151,937 sq ft for those buildings. It was built in 1999, 14 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 Bayside Towers Ii's energy performance changed over time?
BuildingCensus holds 7 California disclosures for Bayside Towers Ii, covering report years 2018–2024. Site EUI moved from 52.1 kBtu/ft² (2018) to 76.3 kBtu/ft² (2024), an 46% increase. Reported emissions went from 452 tCO₂e to 629 tCO₂e over the same span (up 39%).
What does a site EUI of 76.3 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. Bayside Towers Ii's 76.3 kBtu/ft² across 134,033 sq ft works out to about 10.2 billion Btu (2,997 MWh-equivalent) in 2024. The disclosure also reports 2,046,465 kWh of electricity and 31,240 therms of natural gas for the year.
Which law requires Bayside Towers Ii to report its energy use?
Bayside Towers Ii 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:1405842:2024). 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
- 150 Mathilda Place· 134,018 sq ft · score 69 (C)
- 226 Airport Parkway (Concourse 1)· 134,012 sq ft · score 89 (A)
- 10450 Pacific Center Court· 134,000 sq ft
- 10450 Pacific Center· 134,000 sq ft · score 33 (D)
- 5201 Patrick Henry Drive· 134,000 sq ft · score 83 (B)
- 31-33 Technology· 133,987 sq ft · EUI 68.7 kBtu/ft²
- 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 Bayside Towers Ii's energy grade?
Bayside Towers Ii did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 76.3 kBtu/ft².
How much energy does Bayside Towers Ii use?
Its 2024 site energy-use intensity was 76.3 kBtu/ft² across 134,033 sq ft, including 2,046,465 kWh of electricity and 31,240 therms of natural gas.
What are Bayside Towers Ii's carbon emissions?
Bayside Towers Ii reported 629 tCO₂e of greenhouse-gas emissions (4.7 kgCO₂e/ft²) for 2024.
Where is Bayside Towers Ii?
Bayside Towers Ii is at 4100 East 3Rd Avenue, Foster City, in Foster City, California 94404. Its coordinates are 37.57181, -122.26601 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Bayside Towers Ii and when was it built?
Bayside Towers Ii has 134,033 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1999 as its year built. It is classed as office.
Is Bayside Towers Ii 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, “Bayside Towers Ii, Foster City, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/bayside-towers-ii-d5a30800 (data as of July 9, 2026).