Phase3 - 1155 Island
Office in California, CA · 1155 Island Avenue, San Diego · 92101
At a glance
Phase3 - 1155 Island is a 203,596-square-foot office building at 1155 Island Avenue, San Diego in San Diego, California, built in 2011. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 43 out of 100 (grade D), a site energy-use intensity of 77.6 kBtu/ft² and 976 tCO₂e of greenhouse-gas emissions. That score is higher than 13% 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 | 43 (band D) |
| Site EUI | 77.6 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 976 tCO₂e |
| GHG intensity | 4.8 kgCO₂e/ft² |
| Electricity | 3,013,639 kWh |
| Natural gas | 55,221 therms |
| Gross floor area | 203,596 sq ft |
| Source record | california:9866849:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 43 | 77.6 kBtu/ft² | 976 tCO₂e | |
| 2023 | — | 64.6 kBtu/ft² | — | |
| 2022 | 96 | -4 | 29.2 kBtu/ft² | 402 tCO₂e |
| 2021 | 100 | ±0 | 5.0 kBtu/ft² | 84 tCO₂e |
| 2020 | 100 | ±0 | 7.7 kBtu/ft² | 91 tCO₂e |
| 2019 | 100 | 6.1 kBtu/ft² | 81 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
- 1155 Island Avenue, San Diego
- City
- California
- State
- California
- ZIP
- 92101
- Coordinates
- 32.71015, -117.15416
Within ~1 km
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See also: most efficient in California · biggest emitters
How does Phase3 - 1155 Island compare with other office buildings in California?
The latest disclosures cover 6,214 office buildings in California, out of 40,029 buildings citywide. Phase3 - 1155 Island's ENERGY STAR score of 43 compares with an average of 75 across the 4,912 that report a score; it scores higher than 13% of them and lower than 87%. Its site EUI of 77.6 kBtu/ft² is about 38% above the average of 56.4 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 4.8 kgCO₂e/ft² is about 33% above the group average of 3.6 kgCO₂e/ft².
At 203,596 sq ft, it is about 34% above the average floor area of 151,937 sq ft for those buildings. It was built in 2011, 26 years later than 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 Phase3 - 1155 Island's energy performance changed over time?
BuildingCensus holds 6 California disclosures for Phase3 - 1155 Island, covering report years 2019–2024. Its ENERGY STAR score went from 100 in 2019 to 43 in 2024 (-57 points); its best year on file was 2019, at 100. Site EUI moved from 6.1 kBtu/ft² (2019) to 77.6 kBtu/ft² (2024), an 1172% increase. Reported emissions went from 81 tCO₂e to 976 tCO₂e over the same span (up 1100%).
What does an ENERGY STAR score of 43 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 43 means the building performs better than about 43% of its national peers. BuildingCensus bands the score into report-card grades; 43 falls in band D — lowest band (1–54). It sits 32 points below 75, the threshold for ENERGY STAR certification. 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. Phase3 - 1155 Island's 77.6 kBtu/ft² across 203,596 sq ft works out to about 15.8 billion Btu (4,630 MWh-equivalent) in 2024. The disclosure also reports 3,013,639 kWh of electricity and 55,221 therms of natural gas for the year.
Which law requires Phase3 - 1155 Island to report its energy use?
Phase3 - 1155 Island 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:9866849:2024). 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
- The Senator· 203,570 sq ft · score 94 (A)
- 901 Market Street· 203,240 sq ft · EUI 9.1 kBtu/ft²
- Media Studios North - Phase 1 (3100 Thornton Avenue)· 202,853 sq ft · score 98 (A)
- One Viper Way· 202,844 sq ft
- Dixon Landing Business Park (1860-1880)· 202,762 sq ft · score 100 (A)
- Bsrep Ii Sj Towers - 75E Santa Clara St· 202,750 sq ft · score 84 (B)
- 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 Phase3 - 1155 Island's energy grade?
Phase3 - 1155 Island scores 43 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2024 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Phase3 - 1155 Island use?
Its 2024 site energy-use intensity was 77.6 kBtu/ft² across 203,596 sq ft, including 3,013,639 kWh of electricity and 55,221 therms of natural gas.
What are Phase3 - 1155 Island's carbon emissions?
Phase3 - 1155 Island reported 976 tCO₂e of greenhouse-gas emissions (4.8 kgCO₂e/ft²) for 2024.
Where is Phase3 - 1155 Island?
Phase3 - 1155 Island is at 1155 Island Avenue, San Diego, in San Diego, California 92101. Its coordinates are 32.71015, -117.15416 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Phase3 - 1155 Island and when was it built?
Phase3 - 1155 Island has 203,596 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2011 as its year built. It is classed as office.
Is Phase3 - 1155 Island 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, “Phase3 - 1155 Island, San Diego, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/phase3-1155-island-94e69c29 (data as of July 9, 2026).