Preg Middlefield
Office in California, CA · 685 East Middlefield Road, Mountain View · 94043
At a glance
Preg Middlefield is a 117,113-square-foot office building at 685 East Middlefield Road, Mountain View in Mountain View, California, built in 1000. 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 12.2 kBtu/ft² and 82 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 | 12.2 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 82 tCO₂e |
| GHG intensity | 0.7 kgCO₂e/ft² |
| Electricity | 330,344 kWh |
| Natural gas | 1,271 therms |
| Gross floor area | 117,113 sq ft |
| Source record | california:6368877:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 100 | ±0 | 12.2 kBtu/ft² | 82 tCO₂e |
| 2023 | 100 | 14.1 kBtu/ft² | 127 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
- 685 East Middlefield Road, Mountain View
- City
- California
- State
- California
- ZIP
- 94043
- Coordinates
- 37.39289, -122.05165
Within ~1 km
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See also: most efficient in California · biggest emitters
How does Preg Middlefield compare with other office buildings in California?
The latest disclosures cover 6,214 office buildings in California, out of 40,029 buildings citywide. Preg Middlefield'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 12.2 kBtu/ft² is about 78% 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 0.7 kgCO₂e/ft² is about 81% below the group average of 3.6 kgCO₂e/ft².
At 117,113 sq ft, it is about 23% below the average floor area of 151,937 sq ft for those buildings. 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 Preg Middlefield's energy performance changed over time?
BuildingCensus holds 2 California disclosures for Preg Middlefield, covering report years 2023–2024. Its ENERGY STAR score was 100 in both 2023 and 2024. Site EUI moved from 14.1 kBtu/ft² (2023) to 12.2 kBtu/ft² (2024), a 13% decrease. Reported emissions went from 127 tCO₂e to 82 tCO₂e over the same span (down 36%).
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. Preg Middlefield's 12.2 kBtu/ft² across 117,113 sq ft works out to about 1.4 billion Btu (419 MWh-equivalent) in 2024. The disclosure also reports 330,344 kWh of electricity and 1,271 therms of natural gas for the year.
Which law requires Preg Middlefield to report its energy use?
Preg Middlefield 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:6368877:2024). 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
- 2350/2370 Kerner· 117,103 sq ft · EUI 43.3 kBtu/ft²
- 2350/2370 Kerner Blvd San Rafael, Ca 94901· 117,103 sq ft · score 96 (A)
- Fig Garden Financial 5250· 117,046 sq ft · score 83 (B)
- Plaza Centre I-2801 Townsgate· 117,016 sq ft · score 85 (A)
- Silicon Valley R&D (6541 Via Del Oro)· 117,012 sq ft · EUI 25.3 kBtu/ft²
- 1212 Broadway· 117,000 sq ft · EUI 20.5 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 Preg Middlefield's energy grade?
Preg Middlefield 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 Preg Middlefield use?
Its 2024 site energy-use intensity was 12.2 kBtu/ft² across 117,113 sq ft, including 330,344 kWh of electricity and 1,271 therms of natural gas.
What are Preg Middlefield's carbon emissions?
Preg Middlefield reported 82 tCO₂e of greenhouse-gas emissions (0.7 kgCO₂e/ft²) for 2024.
Where is Preg Middlefield?
Preg Middlefield is at 685 East Middlefield Road, Mountain View, in Mountain View, California 94043. Its coordinates are 37.39289, -122.05165 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Preg Middlefield and when was it built?
Preg Middlefield has 117,113 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1000 as its year built. It is classed as office.
Is Preg Middlefield 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, “Preg Middlefield, Mountain View, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/preg-middlefield-87aff926 (data as of July 9, 2026).