350 UNION ST
Mixed Residential in San Francisco, CA · 94133
At a glance
350 UNION ST is a 85,460-square-foot mixed residential building in San Francisco, California, built in 1965. In its 2025 San Francisco benchmarking disclosure it reported an ENERGY STAR score of 100 out of 100 (grade A), a site energy-use intensity of 30.4 kBtu/ft² and 80 tCO₂e of greenhouse-gas emissions. That score is higher than 69% of the 340 scored mixed residential buildings in San Francisco.
SF Environment Code Chapter 20 · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 100 (band A) |
| Site EUI | 30.4 kBtu/ft² |
| Source EUI | 55.7 kBtu/ft² |
| GHG emissions | 80 tCO₂e |
| GHG intensity | 1.7 kgCO₂e/ft² |
| Electricity | 189,486 kWh |
| Natural gas | 8,022 therms |
| Gross floor area | 85,460 sq ft |
| Source record | sf:0105/019:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 100 | ±0 | 30.4 kBtu/ft² | 80 tCO₂e |
| 2024 | 100 | ±0 | 33.0 kBtu/ft² | 92 tCO₂e |
| 2023 | 100 | ±0 | 33.4 kBtu/ft² | 97 tCO₂e |
| 2022 | 100 | 34.9 kBtu/ft² | 99 tCO₂e | |
| 2021 | — | 34.7 kBtu/ft² | 93 tCO₂e | |
| 2020 | — | 35.3 kBtu/ft² | 99 tCO₂e | |
| 2019 | 100 | 35.1 kBtu/ft² | 101 tCO₂e | |
| 2018 | — | — | — |
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
- 350 UNION ST
- City
- San Francisco
- State
- California
- ZIP
- 94133
- Coordinates
- 37.80121, -122.40530
Within ~1 km
Nearby benchmarked buildings
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- The Gateway Apartmentsscore —
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- Three Embarcadero Centerscore 95
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- Two Embarcadero Centerscore 95
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Office · 1,074,596 sq ft
- One Embarcadero Centerscore 89
Commercial · 1,059,539 sq ft
See also: most efficient in San Francisco · biggest emitters
How does 350 UNION 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. 350 UNION ST's ENERGY STAR score of 100 compares with an average of 85 across the 340 that report a score; it scores higher than 69% of them. Its site EUI of 30.4 kBtu/ft² is about 16% below the average of 36.0 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 1.7 kgCO₂e/ft² is about 17% below the group average of 2.0 kgCO₂e/ft².
At 85,460 sq ft, it is about half of the average floor area of 165,572 sq ft for those buildings. Its 1965 construction date is close to the group's average year built (1967).
How has 350 UNION ST's energy performance changed over time?
BuildingCensus holds 8 San Francisco disclosures for 350 UNION ST, covering report years 2018–2025. Its ENERGY STAR score was 100 in both 2019 and 2025. Site EUI moved from 35.1 kBtu/ft² (2019) to 30.4 kBtu/ft² (2025), a 13% decrease. Reported emissions went from 101 tCO₂e to 80 tCO₂e over the same span (down 21%).
What does an ENERGY STAR score of 100 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: 100 is the top of the scale. BuildingCensus bands the score into report-card grades; 100 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. 350 UNION ST's 30.4 kBtu/ft² across 85,460 sq ft works out to about 2.6 billion Btu (761 MWh-equivalent) in 2025. Its source EUI of 55.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 189,486 kWh of electricity and 8,022 therms of natural gas for the year.
Which law requires 350 UNION ST to report its energy use?
350 UNION 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:0105/019:2025). San Francisco's ordinance requires annual benchmarking for commercial buildings over 10,000 sq ft, with administrative penalties for buildings that fail to report.
More mixed residential buildings in San Francisco
- 1278 MARKET ST· 85,213 sq ft
- 2140 TAYLOR ST· 85,032 sq ft · score 73 (B)
- 829 FOLSOM ST· 84,924 sq ft
- 50 RIZAL ST· 84,759 sq ft · score 84 (B)
- 1150 SACRAMENTO ST· 84,692 sq ft · score 82 (B)
- 580 MCALLISTER ST· 84,684 sq ft
- Mixed Residential buildings in San Francisco· 610 benchmarked
- All San Francisco benchmarked buildings· SF Environment Code Chapter 20
- Most efficient large buildings in San Francisco
- Least efficient large buildings in San Francisco
- Biggest emitters in San Francisco
Frequently asked questions
What is 350 UNION ST's energy grade?
350 UNION ST scores 100 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2025 San Francisco disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 350 UNION ST use?
Its 2025 site energy-use intensity was 30.4 kBtu/ft² (55.7 kBtu/ft² source) across 85,460 sq ft, including 189,486 kWh of electricity and 8,022 therms of natural gas.
What are 350 UNION ST's carbon emissions?
350 UNION ST reported 80 tCO₂e of greenhouse-gas emissions (1.7 kgCO₂e/ft²) for 2025.
Where is 350 UNION ST?
350 UNION ST is in San Francisco, California 94133. Its coordinates are 37.80121, -122.40530 (latitude, longitude), as published in the Existing Buildings Energy Performance Ordinance file.
How big is 350 UNION ST and when was it built?
350 UNION ST has 85,460 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1965 as its year built. It is classed as mixed residential.
Is 350 UNION 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, “350 UNION ST, San Francisco, California — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/san-francisco/350-union-st-b9e6bc2e (data as of October 2, 2026).