Cotton Medical South Tower
Medical Office in California, CA · 50 Alessandro Place, Pasadena · 91105
At a glance
Cotton Medical South Tower is a 62,903-square-foot medical office at 50 Alessandro Place, Pasadena in Pasadena, California, built in 1984. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 79 out of 100 (grade B), a site energy-use intensity of 68.6 kBtu/ft² and 272 tCO₂e of greenhouse-gas emissions. That score is higher than 57% of the 546 scored medical office buildings in California.
AB 802 (Public Resources Code §25402.10) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 79 (band B) |
| Site EUI | 68.6 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 272 tCO₂e |
| GHG intensity | 4.3 kgCO₂e/ft² |
| Electricity | 917,063 kWh |
| Natural gas | 12,085 therms |
| Gross floor area | 62,903 sq ft |
| Source record | california:8766590:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 79 | -10 | 68.6 kBtu/ft² | 272 tCO₂e |
| 2023 | 89 | +13 | 57.9 kBtu/ft² | 246 tCO₂e |
| 2022 | 76 | +7 | 61.3 kBtu/ft² | 253 tCO₂e |
| 2021 | 69 | +3 | 64.2 kBtu/ft² | 239 tCO₂e |
| 2020 | 66 | 63.7 kBtu/ft² | 251 tCO₂e | |
| 2019 | — | — | — |
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
- 50 Alessandro Place, Pasadena
- City
- California
- State
- California
- ZIP
- 91105
- Coordinates
- 34.13078, -118.15154
Within ~1 km
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See also: most efficient in California · biggest emitters
How does Cotton Medical South Tower compare with other medical office buildings in California?
The latest disclosures cover 602 medical office buildings in California, out of 40,029 buildings citywide. Cotton Medical South Tower's ENERGY STAR score of 79 compares with an average of 63 across the 546 that report a score; it scores higher than 57% of them and lower than 42%. Its site EUI of 68.6 kBtu/ft² is about 27% below the average of 94.3 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 4.3 kgCO₂e/ft² is about 23% below the group average of 5.6 kgCO₂e/ft².
At 62,903 sq ft, it is about 38% below the average floor area of 100,847 sq ft for those buildings. It was built in 1984, 7 years earlier than the group's average year built (1991). Across all 24 jurisdictions BuildingCensus covers, the 1,266 medical office buildings average an ENERGY STAR score of 64 and a site EUI of 92.2 kBtu/ft².
How has Cotton Medical South Tower's energy performance changed over time?
BuildingCensus holds 6 California disclosures for Cotton Medical South Tower, covering report years 2019–2024. Its ENERGY STAR score went from 66 in 2020 to 79 in 2024 (+13 points); its best year on file was 2023, at 89. Site EUI moved from 63.7 kBtu/ft² (2020) to 68.6 kBtu/ft² (2024), an 8% increase. Reported emissions went from 251 tCO₂e to 272 tCO₂e over the same span (up 8%).
What does an ENERGY STAR score of 79 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 79 means the building performs better than about 79% of its national peers. BuildingCensus bands the score into report-card grades; 79 falls in band B — above median (70–84). 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. Cotton Medical South Tower's 68.6 kBtu/ft² across 62,903 sq ft works out to about 4.3 billion Btu (1,265 MWh-equivalent) in 2024. The disclosure also reports 917,063 kWh of electricity and 12,085 therms of natural gas for the year.
Which law requires Cotton Medical South Tower to report its energy use?
Cotton Medical South Tower 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:8766590:2024). 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 medical office buildings in California
- Vasona Technology Park - 1355 Dell Ave· 62,860 sq ft · score 5 (D)
- Cn3760 Redwood City Veterans Mob· 62,500 sq ft · score 79 (B)
- 400 Taylor· 62,497 sq ft · score 58 (C)
- Living Stream· 62,288 sq ft · score 1 (D)
- 1414 South Grand Avenue· 61,949 sq ft · score 79 (B)
- Ca483-Highland-7000 Boulder Ave· 61,910 sq ft · score 52 (D)
- Medical Office buildings in California· 602 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 Cotton Medical South Tower's energy grade?
Cotton Medical South Tower scores 79 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2024 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Cotton Medical South Tower use?
Its 2024 site energy-use intensity was 68.6 kBtu/ft² across 62,903 sq ft, including 917,063 kWh of electricity and 12,085 therms of natural gas.
What are Cotton Medical South Tower's carbon emissions?
Cotton Medical South Tower reported 272 tCO₂e of greenhouse-gas emissions (4.3 kgCO₂e/ft²) for 2024.
Where is Cotton Medical South Tower?
Cotton Medical South Tower is at 50 Alessandro Place, Pasadena, in Pasadena, California 91105. Its coordinates are 34.13078, -118.15154 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Cotton Medical South Tower and when was it built?
Cotton Medical South Tower has 62,903 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1984 as its year built. It is classed as medical office.
Is Cotton Medical South Tower 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, “Cotton Medical South Tower, Pasadena, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/cotton-medical-south-tower-6d3c60a6 (data as of July 9, 2026).