334 MASON ST
Commercial in San Francisco, CA · 94102
At a glance
334 MASON ST is a 43,070-square-foot commercial building in San Francisco, California, built in 1912. In its 2025 San Francisco benchmarking disclosure it reported an ENERGY STAR score of 53 out of 100 (grade D), a site energy-use intensity of 107.5 kBtu/ft² and 251 tCO₂e of greenhouse-gas emissions. That score is higher than 13% of the 790 scored commercial buildings in San Francisco.
SF Environment Code Chapter 20 · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 53 (band D) |
| Site EUI | 107.5 kBtu/ft² |
| Source EUI | 163.9 kBtu/ft² |
| GHG emissions | 251 tCO₂e |
| GHG intensity | 5.8 kgCO₂e/ft² |
| Electricity | 368,023 kWh |
| Natural gas | 33,761 therms |
| Gross floor area | 43,070 sq ft |
| Source record | sf:0315/017:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 53 | -24 | 107.5 kBtu/ft² | 251 tCO₂e |
| 2024 | 77 | -10 | 74.3 kBtu/ft² | 187 tCO₂e |
| 2023 | 87 | +1 | 60.0 kBtu/ft² | 159 tCO₂e |
| 2022 | 86 | 62.1 kBtu/ft² | 162 tCO₂e | |
| 2021 | — | — | — | |
| 2020 | — | — | — | |
| 2019 | — | — | — | |
| 2018 | 91 | 74.6 kBtu/ft² | 197 tCO₂e | |
| 2017 | — | — | — | |
| 2016 | 60 | +8 | 78.1 kBtu/ft² | 238 tCO₂e |
| 2015 | 52 | -4 | 83.2 kBtu/ft² | 245 tCO₂e |
| 2014 | 56 | +4 | 76.3 kBtu/ft² | 228 tCO₂e |
| 2013 | 52 | 90.4 kBtu/ft² | 260 tCO₂e | |
| 2012 | — | — | — | |
| 2011 | — | — | — |
Compliance context
SF Environment Code Chapter 20
San Francisco's ordinance requires annual benchmarking for commercial buildings over 10,000 sq ft, with administrative penalties for buildings that fail to report.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 334 MASON ST
- City
- San Francisco
- State
- California
- ZIP
- 94102
- Coordinates
- 37.78676, -122.40941
Within ~1 km
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See also: most efficient in San Francisco · biggest emitters
How does 334 MASON ST 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. 334 MASON ST's ENERGY STAR score of 53 compares with an average of 78 across the 790 that report a score; it scores higher than 13% of them and lower than 86%. Its site EUI of 107.5 kBtu/ft² is about twice the average of 49.2 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 5.8 kgCO₂e/ft² is about twice the group average of 2.7 kgCO₂e/ft².
At 43,070 sq ft, it is about 60% below the average floor area of 107,408 sq ft for those buildings. It was built in 1912, 29 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 334 MASON ST's energy performance changed over time?
BuildingCensus holds 15 San Francisco disclosures for 334 MASON ST, covering report years 2011–2025. Its ENERGY STAR score went from 52 in 2013 to 53 in 2025 (+1 points); its best year on file was 2018, at 91. Site EUI moved from 90.4 kBtu/ft² (2013) to 107.5 kBtu/ft² (2025), an 19% increase. Reported emissions went from 260 tCO₂e to 251 tCO₂e over the same span (down 3%).
What does an ENERGY STAR score of 53 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 53 means the building performs better than about 53% of its national peers. BuildingCensus bands the score into report-card grades; 53 falls in band D — lowest band (1–54). It sits 22 points below 75, the threshold for ENERGY STAR certification. 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. 334 MASON ST's 107.5 kBtu/ft² across 43,070 sq ft works out to about 4.6 billion Btu (1,357 MWh-equivalent) in 2025. Its source EUI of 163.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 368,023 kWh of electricity and 33,761 therms of natural gas for the year.
Which law requires 334 MASON ST to report its energy use?
334 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:0315/017:2025). San Francisco's ordinance requires annual benchmarking for commercial buildings over 10,000 sq ft, with administrative penalties for buildings that fail to report.
More commercial buildings in San Francisco
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- Commercial buildings in San Francisco· 1,683 benchmarked
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Frequently asked questions
What is 334 MASON ST's energy grade?
334 MASON ST scores 53 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2025 San Francisco disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 334 MASON ST use?
Its 2025 site energy-use intensity was 107.5 kBtu/ft² (163.9 kBtu/ft² source) across 43,070 sq ft, including 368,023 kWh of electricity and 33,761 therms of natural gas.
What are 334 MASON ST's carbon emissions?
334 MASON ST reported 251 tCO₂e of greenhouse-gas emissions (5.8 kgCO₂e/ft²) for 2025.
Where is 334 MASON ST?
334 MASON ST is in San Francisco, California 94102. Its coordinates are 37.78676, -122.40941 (latitude, longitude), as published in the Existing Buildings Energy Performance Ordinance file.
How big is 334 MASON ST and when was it built?
334 MASON ST has 43,070 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1912 as its year built. It is classed as commercial.
Is 334 MASON ST covered by SF Environment Code Chapter 20?
Yes — it appears in the 2025 Existing Buildings Energy Performance Ordinance disclosure, which lists the buildings reporting under SF Environment Code Chapter 20.
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About this data
Source: Existing Buildings Energy Performance Ordinance (SF Environment Code Chapter 20), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “334 MASON ST, San Francisco, California — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/san-francisco/334-mason-st-09253300 (data as of October 2, 2026).