Cornerstone Lofts
Multifamily Housing in San Diego, CA · 302 Island Ave
At a glance
Cornerstone Lofts is a 76,656-square-foot multifamily housing building at 302 Island Ave in San Diego, California, built in 1992. In its 2022 San Diego benchmarking disclosure it reported an ENERGY STAR score of 100 out of 100 (grade A) and a site energy-use intensity of 5.8 kBtu/ft². That score is higher than 63% of the 383 scored multifamily housing buildings in San Diego.
Building Energy Benchmarking Ordinance (SDMC Ch. 14 Art. 12) · reporting year 2022
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 100 (band A) |
| Site EUI | 5.8 kBtu/ft² |
| Source EUI | — |
| GHG emissions | — |
| GHG intensity | — |
| Gross floor area | 76,656 sq ft |
| Source record | san_diego:101622:2022 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2022latest | 100 | +2 | 5.8 kBtu/ft² | — |
| 2021 | 98 | 8.1 kBtu/ft² | — |
Compliance context
Building Energy Benchmarking Ordinance (SDMC Ch. 14 Art. 12)
San Diego's ordinance requires annual benchmarking for commercial buildings over 50,000 sq ft, with civil penalties for buildings that fail to report.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 302 Island Ave
- City
- San Diego
- State
- California
Within ~1 km
Nearby benchmarked buildings
This source publishes no coordinates, so nearby buildings can't be resolved yet.
See also: most efficient in San Diego · biggest emitters
How does Cornerstone Lofts compare with other multifamily housing buildings in San Diego?
The latest disclosures cover 469 multifamily housing buildings in San Diego, out of 2,567 buildings citywide. Cornerstone Lofts's ENERGY STAR score of 100 compares with an average of 90 across the 383 that report a score; it scores higher than 63% of them. Its site EUI of 5.8 kBtu/ft² is about 78% below the average of 26.4 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 76,656 sq ft, it is about 62% below the average floor area of 203,251 sq ft for those buildings. Its 1992 construction date is close to the group's average year built (1994). Across all 24 jurisdictions BuildingCensus covers, the 59,945 multifamily housing buildings average an ENERGY STAR score of 70 and a site EUI of 59.0 kBtu/ft².
How has Cornerstone Lofts's energy performance changed over time?
BuildingCensus holds 2 San Diego disclosures for Cornerstone Lofts, covering report years 2021–2022. Its ENERGY STAR score went from 98 in 2021 to 100 in 2022 (+2 points). Site EUI moved from 8.1 kBtu/ft² (2021) to 5.8 kBtu/ft² (2022), a 28% decrease.
What does an ENERGY STAR score of 100 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: 100 is the top of the scale. BuildingCensus bands the score into report-card grades; 100 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 San Diego, 73% 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. Cornerstone Lofts's 5.8 kBtu/ft² across 76,656 sq ft works out to about 0.4 billion Btu (130 MWh-equivalent) in 2022.
Which law requires Cornerstone Lofts to report its energy use?
Cornerstone Lofts reports under the Building Energy Benchmarking Ordinance (SDMC Ch. 14 Art. 12), the legal basis of San Diego's Building Energy Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2022 disclosure (source record san_diego:101622:2022). San Diego's ordinance requires annual benchmarking for commercial buildings over 50,000 sq ft, with civil penalties for buildings that fail to report.
More multifamily housing buildings in San Diego
- Torrey Highlands Apartments (tr87)· 76,470 sq ft · score 100 (A)
- Arbor Terrace(ar325)· 75,717 sq ft
- Logan Plaza· 74,615 sq ft · score 100 (A)
- Villas of Renaissance #06· 74,147 sq ft · score 96 (A)
- Villas of Renaissance #12· 74,147 sq ft · score 99 (A)
- Casa De Flores· 73,955 sq ft · score 93 (A)
- Multifamily Housing buildings in San Diego· 469 benchmarked
- All San Diego benchmarked buildings· Building Energy Benchmarking Ordinance (SDMC Ch. 14 Art. 12)
- Most efficient large buildings in San Diego
- Least efficient large buildings in San Diego
- Biggest emitters in San Diego
Frequently asked questions
What is Cornerstone Lofts's energy grade?
Cornerstone Lofts scores 100 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2022 San Diego disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Cornerstone Lofts use?
Its 2022 site energy-use intensity was 5.8 kBtu/ft² across 76,656 sq ft.
What are Cornerstone Lofts's carbon emissions?
No greenhouse-gas emissions figure was reported for 2022.
Where is Cornerstone Lofts?
Cornerstone Lofts is at 302 Island Ave, in San Diego, California.
How big is Cornerstone Lofts and when was it built?
Cornerstone Lofts has 76,656 sq ft of gross floor area, as reported in its 2022 disclosure. The disclosure lists 1992 as its year built. It is classed as multifamily housing.
Is Cornerstone Lofts covered by the Building Energy Benchmarking Ordinance (SDMC Ch. 14 Art. 12)?
Yes — it appears in the 2022 Building Energy Benchmarking disclosure, which lists the buildings reporting under the Building Energy Benchmarking Ordinance (SDMC Ch. 14 Art. 12).
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About this data
Source: Building Energy Benchmarking (Building Energy Benchmarking Ordinance (SDMC Ch. 14 Art. 12)), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Cornerstone Lofts, San Diego, California — 2022 benchmarking disclosure”, https://buildingcensus.com/buildings/san-diego/cornerstone-lofts-35fc069f (data as of July 9, 2026).