599 N Mathilda
Office in California, CA · 599 North Mathilda Avenue, Sunnyvale · 94085
At a glance
599 N Mathilda is a 76,031-square-foot office building at 599 North Mathilda Avenue, Sunnyvale in Sunnyvale, California, built in 2000. In its 2024 California benchmarking disclosure it reported a site energy-use intensity of 14.1 kBtu/ft² and 75 tCO₂e of greenhouse-gas emissions.
AB 802 (Public Resources Code §25402.10) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 14.1 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 75 tCO₂e |
| GHG intensity | 1.0 kgCO₂e/ft² |
| Electricity | 330,134 kWh |
| Natural gas | 2 therms |
| Gross floor area | 76,031 sq ft |
| Source record | california:3607620:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 14.1 kBtu/ft² | 75 tCO₂e | |
| 2023 | — | 11.6 kBtu/ft² | 62 tCO₂e | |
| 2022 | 97 | +30 | 26.7 kBtu/ft² | 132 tCO₂e |
| 2021 | 67 | 71.7 kBtu/ft² | 323 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
- 599 North Mathilda Avenue, Sunnyvale
- City
- California
- State
- California
- ZIP
- 94085
- Coordinates
- 37.39199, -122.03176
Within ~1 km
Nearby benchmarked buildings
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- 505 N Mathildascore 83
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- 555 N Mathildascore 36
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- 684 W Maude Ave, Llcscore —
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- Catalyst - 684 W Maude Avescore —
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See also: most efficient in California · biggest emitters
How does 599 N Mathilda 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 14.1 kBtu/ft² is about 75% 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 1.0 kgCO₂e/ft² is about 73% below the group average of 3.6 kgCO₂e/ft².
At 76,031 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 599 N Mathilda's energy performance changed over time?
BuildingCensus holds 4 California disclosures for 599 N Mathilda, covering report years 2021–2024. Its ENERGY STAR score went from 67 in 2021 to 97 in 2022 (+30 points). Site EUI moved from 71.7 kBtu/ft² (2021) to 14.1 kBtu/ft² (2024), a 80% decrease. Reported emissions went from 323 tCO₂e to 75 tCO₂e over the same span (down 77%).
What does a site EUI of 14.1 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. 599 N Mathilda's 14.1 kBtu/ft² across 76,031 sq ft works out to about 1.1 billion Btu (314 MWh-equivalent) in 2024. The disclosure also reports 330,134 kWh of electricity and 2 therms of natural gas for the year.
Which law requires 599 N Mathilda to report its energy use?
599 N Mathilda 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:3607620:2024). 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
- 9245 Laguna Springs Dr.· 76,000 sq ft · score 86 (A)
- Museum On The Square, Llc· 76,000 sq ft · score 87 (A)
- 7590 N Glenoaks Boulevard· 76,000 sq ft · score 80 (B)
- Nh 4640 Office Owner, Llc· 75,979 sq ft · score 25 (D)
- Seaker & Sons· 75,950 sq ft · EUI 36.5 kBtu/ft²
- Juvenile Hall - Administration Building - 4 (Ab 802)· 75,907 sq ft · score 30 (D)
- 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 599 N Mathilda's energy grade?
599 N Mathilda did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 14.1 kBtu/ft².
How much energy does 599 N Mathilda use?
Its 2024 site energy-use intensity was 14.1 kBtu/ft² across 76,031 sq ft, including 330,134 kWh of electricity and 2 therms of natural gas.
What are 599 N Mathilda's carbon emissions?
599 N Mathilda reported 75 tCO₂e of greenhouse-gas emissions (1.0 kgCO₂e/ft²) for 2024.
Where is 599 N Mathilda?
599 N Mathilda is at 599 North Mathilda Avenue, Sunnyvale, in Sunnyvale, California 94085. Its coordinates are 37.39199, -122.03176 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is 599 N Mathilda and when was it built?
599 N Mathilda has 76,031 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 599 N Mathilda 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, “599 N Mathilda, Sunnyvale, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/599-n-mathilda-44a65d94 (data as of July 9, 2026).