One Sansome Street

How does One Sansome Street compare with other commercial buildings in San Francisco?

The latest disclosures cover 1,683 commercial buildings in San Francisco, out of 2,509 buildings citywide. One Sansome Street's ENERGY STAR score of 85 compares with an average of 78 across the 790 that report a score; it scores higher than 48% of them and lower than 50%. Its site EUI of 35.4 kBtu/ft² is about 28% below the average of 49.2 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 2.2 kgCO₂e/ft² is about 20% below the group average of 2.7 kgCO₂e/ft².

At 738,880 sq ft, it is about 588% above the average floor area of 107,408 sq ft for those buildings. It was built in 1983, 42 years later than the group's average year built (1941). Across all 24 jurisdictions BuildingCensus covers, the 2,307 commercial buildings average an ENERGY STAR score of 76 and a site EUI of 51.3 kBtu/ft².

How has One Sansome Street's energy performance changed over time?

BuildingCensus holds 15 San Francisco disclosures for One Sansome Street, covering report years 2011–2025. Its ENERGY STAR score went from 94 in 2011 to 85 in 2025 (-9 points); its best year on file was 2011, at 94. Site EUI moved from 41.3 kBtu/ft² (2011) to 35.4 kBtu/ft² (2025), a 14% decrease. Reported emissions went from 2,614 tCO₂e to 1,596 tCO₂e over the same span (down 39%).

What does an ENERGY STAR score of 85 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 85 means the building performs better than about 85% of its national peers. BuildingCensus bands the score into report-card grades; 85 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 Francisco, 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. One Sansome Street's 35.4 kBtu/ft² across 738,880 sq ft works out to about 26.2 billion Btu (7,666 MWh-equivalent) in 2025. Its source EUI of 72.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 4,027,284 kWh of electricity and 9,240 therms of natural gas for the year.

Which law requires One Sansome Street to report its energy use?

One Sansome Street reports under SF Environment Code Chapter 20, the legal basis of San Francisco's Existing Buildings Energy Performance Ordinance, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2025 disclosure (source record sf:0289/003:2025). San Francisco's ordinance requires annual benchmarking for commercial buildings over 10,000 sq ft, with administrative penalties for buildings that fail to report.