Ayres Suites Diamond Bar
Hotel in California, CA · 21951 Golden Springs Drive, Diamond Bar · 91765
At a glance
Ayres Suites Diamond Bar is a 59,703-square-foot hotel at 21951 Golden Springs Drive, Diamond Bar in Diamond Bar, California, built in 1998. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 95 out of 100 (grade A), a site energy-use intensity of 63.6 kBtu/ft² and 212 tCO₂e of greenhouse-gas emissions. That score is higher than 76% 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 | 95 (band A) |
| Site EUI | 63.6 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 212 tCO₂e |
| GHG intensity | 3.6 kgCO₂e/ft² |
| Electricity | 428,798 kWh |
| Natural gas | 21,703 therms |
| Gross floor area | 59,703 sq ft |
| Source record | california:6847483:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 95 | +3 | 63.6 kBtu/ft² | 212 tCO₂e |
| 2023 | 92 | -3 | 66.9 kBtu/ft² | 240 tCO₂e |
| 2022 | 95 | -2 | 58.7 kBtu/ft² | 208 tCO₂e |
| 2020 | 97 | +4 | 53.9 kBtu/ft² | 178 tCO₂e |
| 2019 | 93 | +1 | 61.7 kBtu/ft² | 224 tCO₂e |
| 2018 | 92 | 64.5 kBtu/ft² | 231 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
- 21951 Golden Springs Drive, Diamond Bar
- City
- California
- State
- California
- ZIP
- 91765
- Coordinates
- 34.00337, -117.82954
Within ~1 km
Nearby benchmarked buildings
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- Senita Gateway Center Bscore 81
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- Senita Gateway Center Ascore 85
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- 21680 Gateway Centerscore —
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- 21700 Gateway Corporate Centerscore 94
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See also: most efficient in California · biggest emitters
How does Ayres Suites Diamond Bar compare with other hotel buildings in California?
The latest disclosures cover 1,599 hotel buildings in California, out of 40,029 buildings citywide. Ayres Suites Diamond Bar's ENERGY STAR score of 95 compares with an average of 74 across the 1,525 that report a score; it scores higher than 76% of them and lower than 21%. Its site EUI of 63.6 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 3.6 kgCO₂e/ft² is about 11% below the group average of 4.0 kgCO₂e/ft².
At 59,703 sq ft, it is about 64% below the average floor area of 167,786 sq ft for those buildings. It was built in 1998, 10 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 Suites Diamond Bar's energy performance changed over time?
BuildingCensus holds 6 California disclosures for Ayres Suites Diamond Bar, covering report years 2018, 2019, 2020, 2022, 2023, 2024. Its ENERGY STAR score went from 92 in 2018 to 95 in 2024 (+3 points); its best year on file was 2020, at 97. Site EUI moved from 64.5 kBtu/ft² (2018) to 63.6 kBtu/ft² (2024), a 1% decrease. Reported emissions went from 231 tCO₂e to 212 tCO₂e over the same span (down 8%).
What does an ENERGY STAR score of 95 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 95 means the building performs better than about 95% of its national peers. BuildingCensus bands the score into report-card grades; 95 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 Suites Diamond Bar's 63.6 kBtu/ft² across 59,703 sq ft works out to about 3.8 billion Btu (1,113 MWh-equivalent) in 2024. The disclosure also reports 428,798 kWh of electricity and 21,703 therms of natural gas for the year.
Which law requires Ayres Suites Diamond Bar to report its energy use?
Ayres Suites Diamond Bar 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:6847483:2024). 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
- Ramada Costa Mesa· 59,702 sq ft · score 84 (B)
- 2043-Thousand Oaks· 59,615 sq ft · score 100 (A)
- Hampton Inn Suites Banning· 59,600 sq ft · score 97 (A)
- Springhill Suites San Diego Carlsbad - 3136 Carlsbad Blvd Carlsbad, Ca 92008· 59,587 sq ft · score 46 (D)
- Staybridge Suites Palmdale· 59,400 sq ft · score 91 (A)
- Cupertino Hotel· 59,300 sq ft · score 93 (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 Ayres Suites Diamond Bar's energy grade?
Ayres Suites Diamond Bar scores 95 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 Ayres Suites Diamond Bar use?
Its 2024 site energy-use intensity was 63.6 kBtu/ft² across 59,703 sq ft, including 428,798 kWh of electricity and 21,703 therms of natural gas.
What are Ayres Suites Diamond Bar's carbon emissions?
Ayres Suites Diamond Bar reported 212 tCO₂e of greenhouse-gas emissions (3.6 kgCO₂e/ft²) for 2024.
Where is Ayres Suites Diamond Bar?
Ayres Suites Diamond Bar is at 21951 Golden Springs Drive, Diamond Bar, in Diamond Bar, California 91765. Its coordinates are 34.00337, -117.82954 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Ayres Suites Diamond Bar and when was it built?
Ayres Suites Diamond Bar has 59,703 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1998 as its year built. It is classed as hotel.
Is Ayres Suites Diamond Bar 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, “Ayres Suites Diamond Bar, Diamond Bar, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/ayres-suites-diamond-bar-fd431fe0 (data as of July 9, 2026).