340 Mason
Commercial in San Francisco, CA · 336-344 Mason Street · 94102
At a glance
340 Mason is a 25,492-square-foot commercial building at 336-344 Mason Street in San Francisco, California, built in 1968. It is listed in the 2025 Existing Buildings Energy Performance Ordinance disclosure without energy figures: no ENERGY STAR score, energy use or emissions were published for it that year. Its most recent reported figures are from 2024, with a site EUI of 137.7 kBtu/ft².
No energy data reported for 2025
340 Mason appears in the 2025 Existing Buildings Energy Performance Ordinance disclosure, but no ENERGY STAR score, energy use or emissions were published for it — the building did not report benchmarking data for that year. Earlier reported years are in the table below.
Floor area on file: 25,492 sq ft · Built 1968
Source record sf:0315/019:2025
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | — | — | |
| 2024 | — | 137.7 kBtu/ft² | 204 tCO₂e | |
| 2023 | — | 144.9 kBtu/ft² | 221 tCO₂e | |
| 2022 | — | 122.7 kBtu/ft² | 187 tCO₂e | |
| 2021 | — | 117.6 kBtu/ft² | 178 tCO₂e |
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
- 336-344 Mason Street
- City
- San Francisco
- State
- California
- ZIP
- 94102
- Coordinates
- 37.78697, -122.40966
Within ~1 km
Nearby benchmarked buildings
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See also: most efficient in San Francisco · biggest emitters
How has 340 Mason's energy performance changed over time?
BuildingCensus holds 5 San Francisco disclosures for 340 Mason, covering report years 2021–2025. Site EUI moved from 117.6 kBtu/ft² (2021) to 137.7 kBtu/ft² (2024), an 17% increase. Reported emissions went from 178 tCO₂e to 204 tCO₂e over the same span (up 14%).
Which law requires 340 Mason to report its energy use?
340 Mason 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:0315/019:2025). San Francisco's ordinance requires annual benchmarking for commercial buildings over 10,000 sq ft, with administrative penalties for buildings that fail to report.
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Frequently asked questions
What is 340 Mason's energy grade?
340 Mason has no grade: it did not report energy data for 2025. The 2025 Existing Buildings Energy Performance Ordinance disclosure lists the building but publishes no ENERGY STAR score, energy use or emissions for it.
Where is 340 Mason?
340 Mason is at 336-344 Mason Street, in San Francisco, California 94102. Its coordinates are 37.78697, -122.40966 (latitude, longitude), as published in the Existing Buildings Energy Performance Ordinance file.
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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, “340 Mason, San Francisco, California — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/san-francisco/340-mason-05333170 (data as of October 2, 2026).