12 Ontario Ca His
Hotel in California, CA · 4500 Mills Circle, Ontario · 91764
At a glance
12 Ontario Ca His is a 59,016-square-foot hotel at 4500 Mills Circle, Ontario in Ontario, California, built in 2004. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 99 out of 100 (grade A), a site energy-use intensity of 36.7 kBtu/ft² and 131 tCO₂e of greenhouse-gas emissions. That score is higher than 88% of the 1,525 scored hotel buildings in California.
AB 802 (Public Resources Code §25402.10) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 99 (band A) |
| Site EUI | 36.7 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 131 tCO₂e |
| GHG intensity | 2.2 kgCO₂e/ft² |
| Electricity | 360,914 kWh |
| Natural gas | 9,327 therms |
| Gross floor area | 59,016 sq ft |
| Source record | california:33975014:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 99 | +6 | 36.7 kBtu/ft² | 131 tCO₂e |
| 2023 | 93 | 40.4 kBtu/ft² | 145 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.
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Location
- Address
- 4500 Mills Circle, Ontario
- City
- California
- State
- California
- ZIP
- 91764
- Coordinates
- 34.07027, -117.55174
Within ~1 km
Nearby benchmarked buildings
- 5218-1 Mills Cir (Main Mall)score —
Lifestyle Center · 1,900,000 sq ft
- Ontario Millsscore —
Enclosed Mall · 1,303,110 sq ft
Enclosed Mall · 951,541 sq ft
- 5218-Ontario Millsscore —
Retail Store · 886,777 sq ft
Strip Mall · 225,749 sq ft
- 102 Wanamaker Llcscore 7
Non-Refrigerated Warehouse · 195,093 sq ft
See also: most efficient in California · biggest emitters
How does 12 Ontario Ca His compare with other hotel buildings in California?
The latest disclosures cover 1,599 hotel buildings in California, out of 40,029 buildings citywide. 12 Ontario Ca His's ENERGY STAR score of 99 compares with an average of 74 across the 1,525 that report a score; it scores higher than 88% of them and lower than 9%. Its site EUI of 36.7 kBtu/ft² is about 44% below the average of 65.6 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 2.2 kgCO₂e/ft² is about 44% below the group average of 4.0 kgCO₂e/ft².
At 59,016 sq ft, it is about 65% below the average floor area of 167,786 sq ft for those buildings. It was built in 2004, 16 years later than the group's average year built (1988). Across all 24 jurisdictions BuildingCensus covers, the 3,812 hotel buildings average an ENERGY STAR score of 65 and a site EUI of 77.8 kBtu/ft².
How has 12 Ontario Ca His's energy performance changed over time?
BuildingCensus holds 2 California disclosures for 12 Ontario Ca His, covering report years 2023–2024. Its ENERGY STAR score went from 93 in 2023 to 99 in 2024 (+6 points). Site EUI moved from 40.4 kBtu/ft² (2023) to 36.7 kBtu/ft² (2024), a 9% decrease. Reported emissions went from 145 tCO₂e to 131 tCO₂e over the same span (down 10%).
What does an ENERGY STAR score of 99 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 99 means the building performs better than about 99% of its national peers. BuildingCensus bands the score into report-card grades; 99 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. 12 Ontario Ca His's 36.7 kBtu/ft² across 59,016 sq ft works out to about 2.2 billion Btu (635 MWh-equivalent) in 2024. The disclosure also reports 360,914 kWh of electricity and 9,327 therms of natural gas for the year.
Which law requires 12 Ontario Ca His to report its energy use?
12 Ontario Ca His 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:33975014:2024). 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 hotel buildings in California
- Hillsdale Inn· 58,955 sq ft · score 100 (A)
- 477 Hillsdale Blvd· 58,955 sq ft · score 100 (A)
- Best Western - 24840 Elder Ave, Moreno Valley, Ca 92557, Usa· 58,893 sq ft · score 86 (A)
- Empress Hotel La Jolla· 58,819 sq ft · score 53 (D)
- 9011-Northridge· 58,800 sq ft · score 48 (D)
- Livermore Ca Hies· 58,776 sq ft · score 91 (A)
- Hotel buildings in California· 1,599 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 12 Ontario Ca His's energy grade?
12 Ontario Ca His scores 99 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 12 Ontario Ca His use?
Its 2024 site energy-use intensity was 36.7 kBtu/ft² across 59,016 sq ft, including 360,914 kWh of electricity and 9,327 therms of natural gas.
What are 12 Ontario Ca His's carbon emissions?
12 Ontario Ca His reported 131 tCO₂e of greenhouse-gas emissions (2.2 kgCO₂e/ft²) for 2024.
Where is 12 Ontario Ca His?
12 Ontario Ca His is at 4500 Mills Circle, Ontario, in Ontario, California 91764. Its coordinates are 34.07027, -117.55174 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is 12 Ontario Ca His and when was it built?
12 Ontario Ca His has 59,016 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2004 as its year built. It is classed as hotel.
Is 12 Ontario Ca His 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, “12 Ontario Ca His, Ontario, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/12-ontario-ca-his-d67fe449 (data as of July 9, 2026).