23051-Diamond Bar/E. Washington Ave
Self-Storage Facility in California, CA · 21035 Washington Avenue, Walnut · 91789
At a glance
23051-Diamond Bar/E. Washington Ave is a 95,803-square-foot self-storage facility at 21035 Washington Avenue, Walnut in Walnut, California, built in 2010. In its 2024 California benchmarking disclosure it reported a site energy-use intensity of 0.7 kBtu/ft² and 4 tCO₂e of greenhouse-gas emissions.
AB 802 (Public Resources Code §25402.10) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 0.7 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 4 tCO₂e |
| GHG intensity | 0.0 kgCO₂e/ft² |
| Electricity | 7,354 kWh |
| Natural gas | 389 therms |
| Gross floor area | 95,803 sq ft |
| Source record | california:6335970:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 0.7 kBtu/ft² | 4 tCO₂e | |
| 2023 | — | 2.3 kBtu/ft² | 14 tCO₂e | |
| 2022 | — | 2.2 kBtu/ft² | 14 tCO₂e | |
| 2021 | — | 3.7 kBtu/ft² | 21 tCO₂e | |
| 2020 | — | 2.0 kBtu/ft² | 12 tCO₂e | |
| 2019 | — | 2.2 kBtu/ft² | 13 tCO₂e | |
| 2018 | — | 2.1 kBtu/ft² | 14 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
- 21035 Washington Avenue, Walnut
- City
- California
- State
- California
- ZIP
- 91789
- Coordinates
- 34.00728, -117.84488
Within ~1 km
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See also: most efficient in California · biggest emitters
How does 23051-Diamond Bar/E. Washington Ave compare with other self-storage facility buildings in California?
The latest disclosures cover 1,935 self-storage facility buildings in California, out of 40,029 buildings citywide. Its site EUI of 0.7 kBtu/ft² is about 87% below the average of 5.3 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 0.0 kgCO₂e/ft² is about 90% below the group average of 0.4 kgCO₂e/ft².
At 95,803 sq ft, it is roughly in line with the average floor area of 99,202 sq ft for those buildings. It was built in 2010, 17 years later than the group's average year built (1993). Across all 24 jurisdictions BuildingCensus covers, the 3,050 self-storage facility buildings average an ENERGY STAR score of 75 and a site EUI of 9.4 kBtu/ft².
How has 23051-Diamond Bar/E. Washington Ave's energy performance changed over time?
BuildingCensus holds 7 California disclosures for 23051-Diamond Bar/E. Washington Ave, covering report years 2018–2024. Site EUI moved from 2.1 kBtu/ft² (2018) to 0.7 kBtu/ft² (2024), a 67% decrease. Reported emissions went from 14 tCO₂e to 4 tCO₂e over the same span (down 72%).
What does a site EUI of 0.7 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. 23051-Diamond Bar/E. Washington Ave's 0.7 kBtu/ft² across 95,803 sq ft works out to about 0.1 billion Btu (20 MWh-equivalent) in 2024. The disclosure also reports 7,354 kWh of electricity and 389 therms of natural gas for the year.
Which law requires 23051-Diamond Bar/E. Washington Ave to report its energy use?
23051-Diamond Bar/E. Washington 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:6335970:2024). 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 self-storage facility buildings in California
- Universal Ss - Highland· 95,635 sq ft · EUI 1.5 kBtu/ft²
- 4201 French Camp Rd· 95,600 sq ft · EUI 0.4 kBtu/ft²
- Bsp Ss Fairfield Llc· 95,500 sq ft · EUI 5.6 kBtu/ft²
- Universal Ss - Hesperia Juniper· 95,398 sq ft · EUI 1.8 kBtu/ft²
- South Redding Industrial Park· 95,270 sq ft
- Cubesmart (Ca) - Store 861· 95,138 sq ft · EUI 2.0 kBtu/ft²
- Self-Storage Facility buildings in California· 1,935 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 23051-Diamond Bar/E. Washington Ave's energy grade?
23051-Diamond Bar/E. Washington Ave did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 0.7 kBtu/ft².
How much energy does 23051-Diamond Bar/E. Washington Ave use?
Its 2024 site energy-use intensity was 0.7 kBtu/ft² across 95,803 sq ft, including 7,354 kWh of electricity and 389 therms of natural gas.
What are 23051-Diamond Bar/E. Washington Ave's carbon emissions?
23051-Diamond Bar/E. Washington Ave reported 4 tCO₂e of greenhouse-gas emissions (0.0 kgCO₂e/ft²) for 2024.
Where is 23051-Diamond Bar/E. Washington Ave?
23051-Diamond Bar/E. Washington Ave is at 21035 Washington Avenue, Walnut, in Walnut, California 91789. Its coordinates are 34.00728, -117.84488 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is 23051-Diamond Bar/E. Washington Ave and when was it built?
23051-Diamond Bar/E. Washington Ave has 95,803 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2010 as its year built. It is classed as self-storage facility.
Is 23051-Diamond Bar/E. Washington 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, “23051-Diamond Bar/E. Washington Ave, Walnut, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/23051-diamond-bar-e-washington-ave-95791266 (data as of July 9, 2026).