Ayres Hotel Ontario
Hotel in California, CA · 4395 E. Ontario Mills Pkwy, Ontario · 91764
At a glance
Ayres Hotel Ontario is a 56,800-square-foot hotel at 4395 E. Ontario Mills Pkwy, Ontario in Ontario, California, built in 2004. In its 2020 California benchmarking disclosure it reported an ENERGY STAR score of 91 out of 100 (grade A), a site energy-use intensity of 59.3 kBtu/ft² and 197 tCO₂e of greenhouse-gas emissions. That score is higher than 65% of the 1,525 scored hotel buildings in California.
AB 802 (Public Resources Code §25402.10) · reporting year 2020
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 91 (band A) |
| Site EUI | 59.3 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 197 tCO₂e |
| GHG intensity | 3.5 kgCO₂e/ft² |
| Electricity | 499,069 kWh |
| Natural gas | 17,645 therms |
| Gross floor area | 56,800 sq ft |
| Source record | california:6858107:2020 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2020latest | 91 | +14 | 59.3 kBtu/ft² | 197 tCO₂e |
| 2019 | 77 | -3 | 77.9 kBtu/ft² | 266 tCO₂e |
| 2018 | 80 | 67.8 kBtu/ft² | 242 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
- 4395 E. Ontario Mills Pkwy, Ontario
- City
- California
- State
- California
- ZIP
- 91764
- Coordinates
- 34.07028, -117.55564
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 Ayres Hotel Ontario compare with other hotel buildings in California?
The latest disclosures cover 1,599 hotel buildings in California, out of 40,029 buildings citywide. Ayres Hotel Ontario's ENERGY STAR score of 91 compares with an average of 74 across the 1,525 that report a score; it scores higher than 65% of them and lower than 33%. Its site EUI of 59.3 kBtu/ft² is roughly in line with 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 3.5 kgCO₂e/ft² is about 13% below the group average of 4.0 kgCO₂e/ft².
At 56,800 sq ft, it is about 66% 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 Ayres Hotel Ontario's energy performance changed over time?
BuildingCensus holds 3 California disclosures for Ayres Hotel Ontario, covering report years 2018–2020. Its ENERGY STAR score went from 80 in 2018 to 91 in 2020 (+11 points). Site EUI moved from 67.8 kBtu/ft² (2018) to 59.3 kBtu/ft² (2020), a 13% decrease. Reported emissions went from 242 tCO₂e to 197 tCO₂e over the same span (down 19%).
What does an ENERGY STAR score of 91 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 91 means the building performs better than about 91% of its national peers. BuildingCensus bands the score into report-card grades; 91 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. Ayres Hotel Ontario's 59.3 kBtu/ft² across 56,800 sq ft works out to about 3.4 billion Btu (987 MWh-equivalent) in 2020. The disclosure also reports 499,069 kWh of electricity and 17,645 therms of natural gas for the year.
Which law requires Ayres Hotel Ontario to report its energy use?
Ayres Hotel Ontario 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 2020 disclosure (source record california:6858107:2020). 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
- Motel 6 (103)· 56,762 sq ft · score 37 (D)
- Towneplace Suites By Marriott - Redwood City· 56,692 sq ft
- The Fort Sutter Hotel Sacramento· 56,665 sq ft · score 49 (D)
- Hilton Garden Inn Davis Downtown· 56,658 sq ft · score 30 (D)
- 2550 Van Ness Avenue· 56,598 sq ft · score 94 (A)
- 9275-Residence Inn Palmdale· 56,514 sq ft · score 70 (B)
- 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 Ayres Hotel Ontario's energy grade?
Ayres Hotel Ontario scores 91 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2020 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Ayres Hotel Ontario use?
Its 2020 site energy-use intensity was 59.3 kBtu/ft² across 56,800 sq ft, including 499,069 kWh of electricity and 17,645 therms of natural gas.
What are Ayres Hotel Ontario's carbon emissions?
Ayres Hotel Ontario reported 197 tCO₂e of greenhouse-gas emissions (3.5 kgCO₂e/ft²) for 2020.
Where is Ayres Hotel Ontario?
Ayres Hotel Ontario is at 4395 E. Ontario Mills Pkwy, Ontario, in Ontario, California 91764. Its coordinates are 34.07028, -117.55564 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Ayres Hotel Ontario and when was it built?
Ayres Hotel Ontario has 56,800 sq ft of gross floor area, as reported in its 2020 disclosure. The disclosure lists 2004 as its year built. It is classed as hotel.
Is Ayres Hotel Ontario covered by AB 802 (Public Resources Code §25402.10)?
Yes — it appears in the 2020 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, “Ayres Hotel Ontario, Ontario, California — 2020 benchmarking disclosure”, https://buildingcensus.com/buildings/california/ayres-hotel-ontario-9bdc4214 (data as of July 9, 2026).