125 MASON ST

How does 125 MASON ST compare with other mixed residential buildings in San Francisco?

The latest disclosures cover 610 mixed residential buildings in San Francisco, out of 2,509 buildings citywide. 125 MASON ST's ENERGY STAR score of 89 compares with an average of 85 across the 340 that report a score; it scores higher than 34% of them and lower than 65%. Its site EUI of 40.2 kBtu/ft² is about 12% above the average of 36.0 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 2.2 kgCO₂e/ft² is roughly in line with the group average of 2.0 kgCO₂e/ft².

At 123,057 sq ft, it is about 26% below the average floor area of 165,572 sq ft for those buildings.

How has 125 MASON ST's energy performance changed over time?

BuildingCensus holds 8 San Francisco disclosures for 125 MASON ST, covering report years 2018–2025. Its ENERGY STAR score went from 30 in 2018 to 89 in 2025 (+59 points). Site EUI moved from 51.9 kBtu/ft² (2018) to 40.2 kBtu/ft² (2025), a 23% decrease. Reported emissions went from 275 tCO₂e to 269 tCO₂e over the same span (down 2%).

What does an ENERGY STAR score of 89 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 89 means the building performs better than about 89% of its national peers. BuildingCensus bands the score into report-card grades; 89 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. 125 MASON ST's 40.2 kBtu/ft² across 123,057 sq ft works out to about 4.9 billion Btu (1,450 MWh-equivalent) in 2025. Its source EUI of 64.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 457,601 kWh of electricity and 33,807 therms of natural gas for the year.

Which law requires 125 MASON ST to report its energy use?

125 MASON ST 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:0331/018:2025). San Francisco's ordinance requires annual benchmarking for commercial buildings over 10,000 sq ft, with administrative penalties for buildings that fail to report.