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San Marino Apartments: San Marino

Multifamily Housing in California, CA · 10355 South Mills Avenue, Montclair · 91763

At a glance

San Marino Apartments: San Marino is a 68,229-square-foot multifamily housing building at 10355 South Mills Avenue, Montclair in Montclair, California, built in 2009. In its 2022 California benchmarking disclosure it reported an ENERGY STAR score of 98 out of 100 (grade A), a site energy-use intensity of 23.3 kBtu/ft² and 101 tCO₂e of greenhouse-gas emissions. That score is higher than 66% of the 9,612 scored multifamily housing buildings in California.

ENERGY STAR score
98
band A · 2022
Site EUI
23.3
kBtu/ft²
GHG emissions
101
tCO₂e
GHG intensity
1.5
kgCO₂e/ft²
Floor area
68,229
sq ft
Year built
2009
vintage
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85–10070–8455–691–54
This entry + 6 nearby

AB 802 (Public Resources Code §25402.10) · reporting year 2022

Benchmarking record

FieldValue
ENERGY STAR score98 (band A)
Site EUI23.3 kBtu/ft²
Source EUI—
GHG emissions101 tCO₂e
GHG intensity1.5 kgCO₂e/ft²
Electricity308,296 kWh
Natural gas5,436 therms
Gross floor area68,229 sq ft
Source recordcalifornia:5231070:2022

The disclosure history

Year over year

YearScoreΔSite EUIGHG emissions
2022latest98+123.3 kBtu/ft²101 tCO₂e
202197-123.5 kBtu/ft²92 tCO₂e
202098+223.5 kBtu/ft²100 tCO₂e
20199623.3 kBtu/ft²103 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.

Program details →

Ownership

No owning organisation shown. Names of private individuals in the disclosure are not published here.

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Location

Address
10355 South Mills Avenue, Montclair
State
California
ZIP
91763
Coordinates
34.06571, -117.71629

Within ~1 km

Nearby benchmarked buildings

See also: most efficient in California · biggest emitters

How does San Marino Apartments: San Marino 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. San Marino Apartments: San Marino'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 23.3 kBtu/ft² is about 32% below 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 1.5 kgCO₂e/ft² is about 29% below the group average of 2.1 kgCO₂e/ft².

At 68,229 sq ft, it is about half of the average floor area of 150,919 sq ft for those buildings. It was built in 2009, 21 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 San Marino Apartments: San Marino's energy performance changed over time?

BuildingCensus holds 4 California disclosures for San Marino Apartments: San Marino, covering report years 2019–2022. Its ENERGY STAR score went from 96 in 2019 to 98 in 2022 (+2 points); its best year on file was 2020, at 98. Site EUI moved from 23.3 kBtu/ft² (2019) to 23.3 kBtu/ft² (2022), an 0% increase. Reported emissions went from 103 tCO₂e to 101 tCO₂e over the same span (down 2%).

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. San Marino Apartments: San Marino's 23.3 kBtu/ft² across 68,229 sq ft works out to about 1.6 billion Btu (466 MWh-equivalent) in 2022. The disclosure also reports 308,296 kWh of electricity and 5,436 therms of natural gas for the year.

Which law requires San Marino Apartments: San Marino to report its energy use?

San Marino Apartments: San Marino 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 2022 disclosure (source record california:5231070:2022). 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

Frequently asked questions

What is San Marino Apartments: San Marino's energy grade?

San Marino Apartments: San Marino scores 98 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2022 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.

How much energy does San Marino Apartments: San Marino use?

Its 2022 site energy-use intensity was 23.3 kBtu/ft² across 68,229 sq ft, including 308,296 kWh of electricity and 5,436 therms of natural gas.

What are San Marino Apartments: San Marino's carbon emissions?

San Marino Apartments: San Marino reported 101 tCO₂e of greenhouse-gas emissions (1.5 kgCO₂e/ft²) for 2022.

Where is San Marino Apartments: San Marino?

San Marino Apartments: San Marino is at 10355 South Mills Avenue, Montclair, in Montclair, California 91763. Its coordinates are 34.06571, -117.71629 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.

How big is San Marino Apartments: San Marino and when was it built?

San Marino Apartments: San Marino has 68,229 sq ft of gross floor area, as reported in its 2022 disclosure. The disclosure lists 2009 as its year built. It is classed as multifamily housing.

Is San Marino Apartments: San Marino covered by AB 802 (Public Resources Code §25402.10)?

Yes — it appears in the 2022 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, “San Marino Apartments: San Marino, Montclair, California — 2022 benchmarking disclosure”, https://buildingcensus.com/buildings/california/san-marino-apartments-san-marino-240c2590 (data as of July 9, 2026).