420 MAIN ST

How does 420 MAIN 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. 420 MAIN ST's ENERGY STAR score of 91 compares with an average of 85 across the 340 that report a score; it scores higher than 37% of them and lower than 59%. Its site EUI of 43.4 kBtu/ft² is about 21% 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 2.4 kgCO₂e/ft² is about 20% above the group average of 2.0 kgCO₂e/ft².

At 172,376 sq ft, it is roughly in line with the average floor area of 165,572 sq ft for those buildings. It was built in 1991, 25 years later than the group's average year built (1967).

How has 420 MAIN ST's energy performance changed over time?

BuildingCensus holds 8 San Francisco disclosures for 420 MAIN ST, covering report years 2018–2025. Its ENERGY STAR score went from 83 in 2022 to 91 in 2025 (+8 points). Site EUI moved from 46.3 kBtu/ft² (2020) to 43.4 kBtu/ft² (2025), a 6% decrease. Reported emissions went from 459 tCO₂e to 414 tCO₂e over the same span (down 10%).

What does an ENERGY STAR score of 91 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 91 means the building performs better than about 91% of its national peers. BuildingCensus bands the score into report-card grades; 91 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. 420 MAIN ST's 43.4 kBtu/ft² across 172,376 sq ft works out to about 7.5 billion Btu (2,193 MWh-equivalent) in 2025. Its source EUI of 87.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,197,666 kWh of electricity and 33,941 therms of natural gas for the year.

Which law requires 420 MAIN ST to report its energy use?

420 MAIN 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:3767/014:2025). San Francisco's ordinance requires annual benchmarking for commercial buildings over 10,000 sq ft, with administrative penalties for buildings that fail to report.