405 East 4Th Ave
Office in California, CA · 405 East 4Th Avenue, San Mateo · 94401
At a glance
405 East 4Th Ave is a 79,050-square-foot office building at 405 East 4Th Avenue, San Mateo in San Mateo, California, built in 1980. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 80 out of 100 (grade B), a site energy-use intensity of 37.3 kBtu/ft² and 196 tCO₂e of greenhouse-gas emissions. That score is higher than 42% 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 | 80 (band B) |
| Site EUI | 37.3 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 196 tCO₂e |
| GHG intensity | 2.5 kgCO₂e/ft² |
| Electricity | 865,224 kWh |
| Gross floor area | 79,050 sq ft |
| Source record | california:20797728:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 80 | 37.3 kBtu/ft² | 196 tCO₂e | |
| 2023 | — | 33.9 kBtu/ft² | 190 tCO₂e | |
| 2022 | — | 36.0 kBtu/ft² | 195 tCO₂e | |
| 2021 | — | 34.9 kBtu/ft² | 189 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
- 405 East 4Th Avenue, San Mateo
- City
- California
- State
- California
- ZIP
- 94401
- Coordinates
- 37.56575, -122.32072
Within ~1 km
Nearby benchmarked buildings
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- Avery Mills Square L.P.score —
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- 400 South El Camino Realscore 56
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See also: most efficient in California · biggest emitters
How does 405 East 4Th Ave compare with other office buildings in California?
The latest disclosures cover 6,214 office buildings in California, out of 40,029 buildings citywide. 405 East 4Th Ave's ENERGY STAR score of 80 compares with an average of 75 across the 4,912 that report a score; it scores higher than 42% of them and lower than 56%. Its site EUI of 37.3 kBtu/ft² is about 34% 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 31% below the group average of 3.6 kgCO₂e/ft².
At 79,050 sq ft, it is about half of the average floor area of 151,937 sq ft for those buildings. It was built in 1980, 5 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 405 East 4Th Ave's energy performance changed over time?
BuildingCensus holds 4 California disclosures for 405 East 4Th Ave, covering report years 2021–2024. Site EUI moved from 34.9 kBtu/ft² (2021) to 37.3 kBtu/ft² (2024), an 7% increase. Reported emissions went from 189 tCO₂e to 196 tCO₂e over the same span (up 4%).
What does an ENERGY STAR score of 80 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 80 means the building performs better than about 80% of its national peers. BuildingCensus bands the score into report-card grades; 80 falls in band B — above median (70–84). 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. 405 East 4Th Ave's 37.3 kBtu/ft² across 79,050 sq ft works out to about 2.9 billion Btu (864 MWh-equivalent) in 2024. The disclosure also reports 865,224 kWh of electricity for the year.
Which law requires 405 East 4Th Ave to report its energy use?
405 East 4Th Ave 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:20797728:2024). 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
- 2227 Capricorn Way· 79,038 sq ft · score 74 (B)
- 960 Overland Court - San Dimas· 79,036 sq ft · score 51 (D)
- 100 N. Citrus· 79,000 sq ft · score 66 (C)
- Maldef· 79,000 sq ft · score 6 (D)
- Vista Sorrento, Llc· 78,976 sq ft · score 88 (A)
- Sutter Health-2300 River Plaza Drive· 78,960 sq ft · score 70 (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 405 East 4Th Ave's energy grade?
405 East 4Th Ave scores 80 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2024 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 405 East 4Th Ave use?
Its 2024 site energy-use intensity was 37.3 kBtu/ft² across 79,050 sq ft, including 865,224 kWh of electricity.
What are 405 East 4Th Ave's carbon emissions?
405 East 4Th Ave reported 196 tCO₂e of greenhouse-gas emissions (2.5 kgCO₂e/ft²) for 2024.
Where is 405 East 4Th Ave?
405 East 4Th Ave is at 405 East 4Th Avenue, San Mateo, in San Mateo, California 94401. Its coordinates are 37.56575, -122.32072 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is 405 East 4Th Ave and when was it built?
405 East 4Th Ave has 79,050 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1980 as its year built. It is classed as office.
Is 405 East 4Th Ave 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, “405 East 4Th Ave, San Mateo, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/405-east-4th-ave-b260b44d (data as of July 9, 2026).