121 2nd Street

How does 121 2nd 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. 121 2nd Street's ENERGY STAR score of 98 compares with an average of 78 across the 790 that report a score; it scores higher than 82% of them and lower than 14%. Its site EUI of 35.7 kBtu/ft² is about 27% 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 1.9 kgCO₂e/ft² is about 29% below the group average of 2.7 kgCO₂e/ft².

At 36,724 sq ft, it is about 66% below the average floor area of 107,408 sq ft for those buildings. It was built in 1907, 34 years earlier 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 121 2nd Street's energy performance changed over time?

BuildingCensus holds 15 San Francisco disclosures for 121 2nd Street, covering report years 2011–2025. Its ENERGY STAR score went from 87 in 2012 to 98 in 2025 (+11 points); its best year on file was 2022, at 99. Site EUI moved from 58.5 kBtu/ft² (2012) to 35.7 kBtu/ft² (2025), a 39% decrease. Reported emissions went from 153 tCO₂e to 70 tCO₂e over the same span (down 54%).

What does an ENERGY STAR score of 98 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 98 means the building performs better than about 98% of its national peers. BuildingCensus bands the score into report-card grades; 98 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. 121 2nd Street's 35.7 kBtu/ft² across 36,724 sq ft works out to about 1.3 billion Btu (384 MWh-equivalent) in 2025. Its source EUI of 43.0 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 33,776 kWh of electricity and 11,976 therms of natural gas for the year.

Which law requires 121 2nd Street to report its energy use?

121 2nd 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:3721/071:2025). San Francisco's ordinance requires annual benchmarking for commercial buildings over 10,000 sq ft, with administrative penalties for buildings that fail to report.