Regents Square I
Office in California, CA · 4275 Executive Sq, La Jolla · 92037
At a glance
Regents Square I is a 200,052-square-foot office building at 4275 Executive Sq, La Jolla in La Jolla, California, built in 1984. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 93 out of 100 (grade A), a site energy-use intensity of 42.4 kBtu/ft² and 524 tCO₂e of greenhouse-gas emissions. That score is higher than 72% of the 4,912 scored office buildings in California.
AB 802 (Public Resources Code §25402.10) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 93 (band A) |
| Site EUI | 42.4 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 524 tCO₂e |
| GHG intensity | 2.6 kgCO₂e/ft² |
| Electricity | 1,534,552 kWh |
| Gross floor area | 200,052 sq ft |
| Source record | california:1585337:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 93 | ±0 | 42.4 kBtu/ft² | 524 tCO₂e |
| 2023 | 93 | +4 | 42.4 kBtu/ft² | 542 tCO₂e |
| 2022 | 89 | +2 | 47.9 kBtu/ft² | 603 tCO₂e |
| 2021 | 87 | -4 | 46.2 kBtu/ft² | 533 tCO₂e |
| 2020 | 91 | +1 | 43.3 kBtu/ft² | 535 tCO₂e |
| 2019 | 90 | +17 | 60.2 kBtu/ft² | 760 tCO₂e |
| 2018 | 73 | 81.6 kBtu/ft² | 1,022 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
- 4275 Executive Sq, La Jolla
- City
- California
- State
- California
- ZIP
- 92037
- Coordinates
- 32.87359, -117.21502
Within ~1 km
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See also: most efficient in California · biggest emitters
How does Regents Square I compare with other office buildings in California?
The latest disclosures cover 6,214 office buildings in California, out of 40,029 buildings citywide. Regents Square I's ENERGY STAR score of 93 compares with an average of 75 across the 4,912 that report a score; it scores higher than 72% of them and lower than 25%. Its site EUI of 42.4 kBtu/ft² is about 25% below the average of 56.4 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 2.6 kgCO₂e/ft² is about 27% below the group average of 3.6 kgCO₂e/ft².
At 200,052 sq ft, it is about 32% above the average floor area of 151,937 sq ft for those buildings. Its 1984 construction date is close to the group's average year built (1985). Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
How has Regents Square I's energy performance changed over time?
BuildingCensus holds 7 California disclosures for Regents Square I, covering report years 2018–2024. Its ENERGY STAR score went from 73 in 2018 to 93 in 2024 (+20 points); its best year on file was 2023, at 93. Site EUI moved from 81.6 kBtu/ft² (2018) to 42.4 kBtu/ft² (2024), a 48% decrease. Reported emissions went from 1,022 tCO₂e to 524 tCO₂e over the same span (down 49%).
What does an ENERGY STAR score of 93 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 93 means the building performs better than about 93% of its national peers. BuildingCensus bands the score into report-card grades; 93 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. Regents Square I's 42.4 kBtu/ft² across 200,052 sq ft works out to about 8.5 billion Btu (2,486 MWh-equivalent) in 2024. The disclosure also reports 1,534,552 kWh of electricity for the year.
Which law requires Regents Square I to report its energy use?
Regents Square I 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:1585337:2024). 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 office buildings in California
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- Building 1, 1025 E Ball Rd, Anaheim· 200,000 sq ft · score 29 (D)
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- 1130 K St· 200,000 sq ft · score 97 (A)
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- Office buildings in California· 6,214 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 Regents Square I's energy grade?
Regents Square I scores 93 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 Regents Square I use?
Its 2024 site energy-use intensity was 42.4 kBtu/ft² across 200,052 sq ft, including 1,534,552 kWh of electricity.
What are Regents Square I's carbon emissions?
Regents Square I reported 524 tCO₂e of greenhouse-gas emissions (2.6 kgCO₂e/ft²) for 2024.
Where is Regents Square I?
Regents Square I is at 4275 Executive Sq, La Jolla, in La Jolla, California 92037. Its coordinates are 32.87359, -117.21502 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Regents Square I and when was it built?
Regents Square I has 200,052 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1984 as its year built. It is classed as office.
Is Regents Square I 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, “Regents Square I, La Jolla, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/regents-square-i-80b6bb25 (data as of July 9, 2026).