One Sansome Street
Office in California, CA · 1 Sansome Street, San Francisco · 94104
At a glance
One Sansome Street is a 738,880-square-foot office building at 1 Sansome Street, San Francisco in San Francisco, California, built in 1984. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 87 out of 100 (grade A) and 1,780 tCO₂e of greenhouse-gas emissions. That score is higher than 56% 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 | 87 (band A) |
| Site EUI | — |
| Source EUI | — |
| GHG emissions | 1,780 tCO₂e |
| GHG intensity | 2.4 kgCO₂e/ft² |
| Electricity | 4,101,067 kWh |
| Natural gas | 9,073 therms |
| Gross floor area | 738,880 sq ft |
| Source record | california:1110564:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 87 | -4 | — | 1,780 tCO₂e |
| 2023 | 91 | -1 | — | 1,710 tCO₂e |
| 2022 | 92 | +1 | 36.7 kBtu/ft² | 1,839 tCO₂e |
| 2021 | 91 | +1 | 37.6 kBtu/ft² | 1,721 tCO₂e |
| 2020 | 90 | +1 | 38.6 kBtu/ft² | 1,738 tCO₂e |
| 2019 | 89 | +6 | 48.7 kBtu/ft² | 2,328 tCO₂e |
| 2018 | 83 | 47.0 kBtu/ft² | 2,395 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.
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Location
- Address
- 1 Sansome Street, San Francisco
- City
- California
- State
- California
- ZIP
- 94104
- Coordinates
- 37.79045, -122.40115
Within ~1 km
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- 555 California Streetscore 76
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- 500 BATTERY STscore —
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See also: most efficient in California · biggest emitters
How does One Sansome Street compare with other office buildings in California?
The latest disclosures cover 6,214 office buildings in California, out of 40,029 buildings citywide. One Sansome Street's ENERGY STAR score of 87 compares with an average of 75 across the 4,912 that report a score; it scores higher than 56% of them and lower than 41%. Its emissions intensity of 2.4 kgCO₂e/ft² is about 33% below the group average of 3.6 kgCO₂e/ft².
At 738,880 sq ft, it is about 386% 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 One Sansome Street's energy performance changed over time?
BuildingCensus holds 7 California disclosures for One Sansome Street, covering report years 2018–2024. Its ENERGY STAR score went from 83 in 2018 to 87 in 2024 (+4 points); its best year on file was 2022, at 92. Site EUI moved from 47.0 kBtu/ft² (2018) to 36.7 kBtu/ft² (2022), a 22% decrease. Reported emissions went from 2,395 tCO₂e to 1,780 tCO₂e over the same span (down 26%).
What does an ENERGY STAR score of 87 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 87 means the building performs better than about 87% of its national peers. BuildingCensus bands the score into report-card grades; 87 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.
Which law requires One Sansome Street to report its energy use?
One Sansome Street 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:1110564:2024). 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
- 865 South Figueroa· 732,349 sq ft · score 92 (A)
- 865 S. Figueroa Street· 732,349 sq ft · score 94 (A)
- 865 S. Figueroa Street· 732,349 sq ft · score 88 (A)
- 7800 Woodley Ave Office· 731,808 sq ft · score 100 (A)
- 560 Mission Street· 731,682 sq ft · score 90 (A)
- 300 Mission· 726,697 sq ft · score 92 (A)
- 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 One Sansome Street's energy grade?
One Sansome Street scores 87 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 One Sansome Street use?
No energy-use intensity was reported for 2024.
What are One Sansome Street's carbon emissions?
One Sansome Street reported 1,780 tCO₂e of greenhouse-gas emissions (2.4 kgCO₂e/ft²) for 2024.
Where is One Sansome Street?
One Sansome Street is at 1 Sansome Street, San Francisco, in San Francisco, California 94104. Its coordinates are 37.79045, -122.40115 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is One Sansome Street and when was it built?
One Sansome Street has 738,880 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 One Sansome Street 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, “One Sansome Street, San Francisco, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/one-sansome-street-b4d4298b (data as of July 9, 2026).