1150 UNION ST
Mixed Residential in San Francisco, CA · 94109
At a glance
1150 UNION ST is a 61,657-square-foot mixed residential building in San Francisco, California, built in 1930. In its 2025 San Francisco benchmarking disclosure it reported an ENERGY STAR score of 57 out of 100 (grade C), a site energy-use intensity of 53.6 kBtu/ft² and 178 tCO₂e of greenhouse-gas emissions. That score is higher than 12% 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 | 57 (band C) |
| Site EUI | 53.6 kBtu/ft² |
| Source EUI | 70.7 kBtu/ft² |
| GHG emissions | 178 tCO₂e |
| GHG intensity | 2.9 kgCO₂e/ft² |
| Electricity | 148,486 kWh |
| Natural gas | 27,993 therms |
| Gross floor area | 61,657 sq ft |
| Source record | sf:0097/013:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 57 | +14 | 53.6 kBtu/ft² | 178 tCO₂e |
| 2024 | 43 | +18 | 59.1 kBtu/ft² | 201 tCO₂e |
| 2023 | 25 | -4 | 70.0 kBtu/ft² | 239 tCO₂e |
| 2022 | 29 | 67.9 kBtu/ft² | 231 tCO₂e | |
| 2021 | — | 67.7 kBtu/ft² | 231 tCO₂e | |
| 2020 | — | — | — | |
| 2019 | — | — | — | |
| 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.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 1150 UNION ST
- City
- San Francisco
- State
- California
- ZIP
- 94109
- Coordinates
- 37.79954, -122.41840
Within ~1 km
Nearby benchmarked buildings
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- 211 BEACH STscore 98
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- 260 BAY STscore 100
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- 999 GREEN STscore —
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- 999 Green Streetscore 94
Multifamily Housing · 381,255 sq ft
- Intercontinental Mark Hopkinsscore 100
Hotel · 360,588 sq ft
See also: most efficient in San Francisco · biggest emitters
How does 1150 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. 1150 UNION ST's ENERGY STAR score of 57 compares with an average of 85 across the 340 that report a score; it scores higher than 12% of them and lower than 88%. Its site EUI of 53.6 kBtu/ft² is about 49% 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 2.9 kgCO₂e/ft² is about 44% above the group average of 2.0 kgCO₂e/ft².
At 61,657 sq ft, it is about 63% below the average floor area of 165,572 sq ft for those buildings. It was built in 1930, 36 years earlier than the group's average year built (1967).
How has 1150 UNION ST's energy performance changed over time?
BuildingCensus holds 8 San Francisco disclosures for 1150 UNION ST, covering report years 2018–2025. Its ENERGY STAR score went from 29 in 2022 to 57 in 2025 (+28 points). Site EUI moved from 67.7 kBtu/ft² (2021) to 53.6 kBtu/ft² (2025), a 21% decrease. Reported emissions went from 231 tCO₂e to 178 tCO₂e over the same span (down 23%).
What does an ENERGY STAR score of 57 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 57 means the building performs better than about 57% of its national peers. BuildingCensus bands the score into report-card grades; 57 falls in band C — below median (55–69). It sits 18 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. 1150 UNION ST's 53.6 kBtu/ft² across 61,657 sq ft works out to about 3.3 billion Btu (969 MWh-equivalent) in 2025. Its source EUI of 70.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 148,486 kWh of electricity and 27,993 therms of natural gas for the year.
Which law requires 1150 UNION ST to report its energy use?
1150 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:0097/013:2025). 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
- 1343 STOCKTON ST· 61,646 sq ft
- 1090 EDDY ST· 61,566 sq ft
- 201 06TH ST· 61,560 sq ft · score 100 (A)
- Derek Silva Community· 61,553 sq ft · score 38 (D)
- 638 19TH ST· 61,448 sq ft
- 50 CHURCH ST· 61,414 sq ft · score 44 (D)
- 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 1150 UNION ST's energy grade?
1150 UNION ST scores 57 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2025 San Francisco disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 1150 UNION ST use?
Its 2025 site energy-use intensity was 53.6 kBtu/ft² (70.7 kBtu/ft² source) across 61,657 sq ft, including 148,486 kWh of electricity and 27,993 therms of natural gas.
What are 1150 UNION ST's carbon emissions?
1150 UNION ST reported 178 tCO₂e of greenhouse-gas emissions (2.9 kgCO₂e/ft²) for 2025.
Where is 1150 UNION ST?
1150 UNION ST is in San Francisco, California 94109. Its coordinates are 37.79954, -122.41840 (latitude, longitude), as published in the Existing Buildings Energy Performance Ordinance file.
How big is 1150 UNION ST and when was it built?
1150 UNION ST has 61,657 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1930 as its year built. It is classed as mixed residential.
Is 1150 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, “1150 UNION ST, San Francisco, California — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/san-francisco/1150-union-st-e85b830f (data as of October 2, 2026).