Maxwell Apartments - Essex (Sm172)
Multifamily Housing in California, CA · 311 S Mathilda Ave, Sunnyvale · 94086
At a glance
Maxwell Apartments - Essex (Sm172) is a 154,316-square-foot multifamily housing building at 311 S Mathilda Ave, Sunnyvale in Sunnyvale, California, built in 2022. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 98 out of 100 (grade A), a site energy-use intensity of 18.3 kBtu/ft² and 169 tCO₂e of greenhouse-gas emissions. That score is higher than 66% of the 9,612 scored multifamily housing buildings in California.
AB 802 (Public Resources Code §25402.10) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 98 (band A) |
| Site EUI | 18.3 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 169 tCO₂e |
| GHG intensity | 1.1 kgCO₂e/ft² |
| Electricity | 500,608 kWh |
| Natural gas | 10,512 therms |
| Gross floor area | 154,316 sq ft |
| Source record | california:29924565:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 98 | 18.3 kBtu/ft² | 169 tCO₂e | |
| 2023 | — | 11.4 kBtu/ft² | 110 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
- 311 S Mathilda Ave, Sunnyvale
- City
- California
- State
- California
- ZIP
- 94086
- Coordinates
- 37.37505, -122.03548
Within ~1 km
Nearby benchmarked buildings
- Flats At Citylinescore —
Multifamily Housing · 289,259 sq ft
- Flats At Cityline (Fl016)score 8
Multifamily Housing · 227,488 sq ft
- 481 On Mathilda (Nm43)score 100
Multifamily Housing · 221,600 sq ft
- 100 Mathilda Placescore 78
Office · 213,405 sq ft
- Briarwood - 29160score 100
Multifamily Housing · 198,646 sq ft
- 100 Altairscore 100
Office · 180,417 sq ft
See also: most efficient in California · biggest emitters
How does Maxwell Apartments - Essex (Sm172) compare with other multifamily housing buildings in California?
The latest disclosures cover 10,630 multifamily housing buildings in California, out of 40,029 buildings citywide. Maxwell Apartments - Essex (Sm172)'s ENERGY STAR score of 98 compares with an average of 82 across the 9,612 that report a score; it scores higher than 66% of them and lower than 29%. Its site EUI of 18.3 kBtu/ft² is about half of the average of 34.4 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 1.1 kgCO₂e/ft² is about half of the group average of 2.1 kgCO₂e/ft².
At 154,316 sq ft, it is roughly in line with the average floor area of 150,919 sq ft for those buildings. It was built in 2022, 34 years later than the group's average year built (1988). Across all 24 jurisdictions BuildingCensus covers, the 59,945 multifamily housing buildings average an ENERGY STAR score of 70 and a site EUI of 59.0 kBtu/ft².
How has Maxwell Apartments - Essex (Sm172)'s energy performance changed over time?
BuildingCensus holds 2 California disclosures for Maxwell Apartments - Essex (Sm172), covering report years 2023–2024. Site EUI moved from 11.4 kBtu/ft² (2023) to 18.3 kBtu/ft² (2024), an 61% increase. Reported emissions went from 110 tCO₂e to 169 tCO₂e over the same span (up 54%).
What does an ENERGY STAR score of 98 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 98 means the building performs better than about 98% of its national peers. BuildingCensus bands the score into report-card grades; 98 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. Maxwell Apartments - Essex (Sm172)'s 18.3 kBtu/ft² across 154,316 sq ft works out to about 2.8 billion Btu (828 MWh-equivalent) in 2024. The disclosure also reports 500,608 kWh of electricity and 10,512 therms of natural gas for the year.
Which law requires Maxwell Apartments - Essex (Sm172) to report its energy use?
Maxwell Apartments - Essex (Sm172) 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:29924565:2024). 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 multifamily housing buildings in California
- Victoria Green - Total· 154,275 sq ft · score 96 (A)
- Park Bonita (Pr07)· 154,256 sq ft · score 100 (A)
- The Vineyards· 154,216 sq ft · score 72 (B)
- Renew Berryessa· 154,152 sq ft · score 84 (B)
- Woodleaf - 29172· 154,148 sq ft · score 98 (A)
- Village At Henderson (Vt33)· 154,140 sq ft · score 100 (A)
- Multifamily Housing buildings in California· 10,630 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 Maxwell Apartments - Essex (Sm172)'s energy grade?
Maxwell Apartments - Essex (Sm172) scores 98 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 Maxwell Apartments - Essex (Sm172) use?
Its 2024 site energy-use intensity was 18.3 kBtu/ft² across 154,316 sq ft, including 500,608 kWh of electricity and 10,512 therms of natural gas.
What are Maxwell Apartments - Essex (Sm172)'s carbon emissions?
Maxwell Apartments - Essex (Sm172) reported 169 tCO₂e of greenhouse-gas emissions (1.1 kgCO₂e/ft²) for 2024.
Where is Maxwell Apartments - Essex (Sm172)?
Maxwell Apartments - Essex (Sm172) is at 311 S Mathilda Ave, Sunnyvale, in Sunnyvale, California 94086. Its coordinates are 37.37505, -122.03548 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Maxwell Apartments - Essex (Sm172) and when was it built?
Maxwell Apartments - Essex (Sm172) has 154,316 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2022 as its year built. It is classed as multifamily housing.
Is Maxwell Apartments - Essex (Sm172) 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).
Working with California building benchmarking records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Maxwell Apartments - Essex (Sm172), Sunnyvale, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/maxwell-apartments-essex-sm172-6682c75e (data as of July 9, 2026).