1150 Union Street
Multifamily Housing in California, CA · 1150 Union Street, San Francisco · 94109
At a glance
1150 Union Street is a 61,657-square-foot multifamily housing building at 1150 Union Street, San Francisco in San Francisco, California, built in 1930. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 43 out of 100 (grade D), a site energy-use intensity of 58.3 kBtu/ft² and 201 tCO₂e of greenhouse-gas emissions. That score is higher than 8% of the 9,612 scored multifamily housing buildings in California.
AB 802 (Public Resources Code §25402.10) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 43 (band D) |
| Site EUI | 58.3 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 201 tCO₂e |
| GHG intensity | 3.3 kgCO₂e/ft² |
| Electricity | 160,836 kWh |
| Natural gas | 30,972 therms |
| Gross floor area | 61,657 sq ft |
| Source record | california:21654982:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 43 | +18 | 58.3 kBtu/ft² | 201 tCO₂e |
| 2023 | 25 | -4 | 69.3 kBtu/ft² | 239 tCO₂e |
| 2022 | 29 | +8 | 67.5 kBtu/ft² | 231 tCO₂e |
| 2021 | 21 | 69.1 kBtu/ft² | 231 tCO₂e |
Compliance context
AB 802 (Public Resources Code §25402.10)
AB 802 requires every California commercial building over 50,000 sq ft to report energy use to the CEC annually; the CEC publicly discloses the results statewide.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 1150 Union Street, San Francisco
- City
- California
- State
- California
- ZIP
- 94109
- Coordinates
- 37.79945, -122.41852
Within ~1 km
Nearby benchmarked buildings
- 1300 CLAY STscore —
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- 211 BEACH STscore 98
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- 260 BAY STscore 100
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- 999 GREEN STscore —
Mixed Residential · 381,255 sq ft
- 999 Green Streetscore 94
Multifamily Housing · 381,255 sq ft
- Intercontinental Mark Hopkinsscore 100
Hotel · 360,588 sq ft
See also: most efficient in California · biggest emitters
How does 1150 Union Street compare with other multifamily housing buildings in California?
The latest disclosures cover 10,630 multifamily housing buildings in California, out of 40,029 buildings citywide. 1150 Union Street's ENERGY STAR score of 43 compares with an average of 82 across the 9,612 that report a score; it scores higher than 8% of them and lower than 92%. Its site EUI of 58.3 kBtu/ft² is about 69% above the average of 34.4 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 3.3 kgCO₂e/ft² is about 55% above the group average of 2.1 kgCO₂e/ft².
At 61,657 sq ft, it is about 59% below the average floor area of 150,919 sq ft for those buildings. It was built in 1930, 58 years earlier than the group's average year built (1988). Across all 24 jurisdictions BuildingCensus covers, the 59,945 multifamily housing buildings average an ENERGY STAR score of 70 and a site EUI of 59.0 kBtu/ft².
How has 1150 Union Street's energy performance changed over time?
BuildingCensus holds 4 California disclosures for 1150 Union Street, covering report years 2021–2024. Its ENERGY STAR score went from 21 in 2021 to 43 in 2024 (+22 points). Site EUI moved from 69.1 kBtu/ft² (2021) to 58.3 kBtu/ft² (2024), a 16% decrease. Reported emissions went from 231 tCO₂e to 201 tCO₂e over the same span (down 13%).
What does an ENERGY STAR score of 43 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 43 means the building performs better than about 43% of its national peers. BuildingCensus bands the score into report-card grades; 43 falls in band D — lowest band (1–54). It sits 32 points below 75, the threshold for ENERGY STAR certification. In California, 65% 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 Street's 58.3 kBtu/ft² across 61,657 sq ft works out to about 3.6 billion Btu (1,053 MWh-equivalent) in 2024. The disclosure also reports 160,836 kWh of electricity and 30,972 therms of natural gas for the year.
Which law requires 1150 Union Street to report its energy use?
1150 Union Street reports under AB 802 (Public Resources Code §25402.10), the legal basis of California's Building Energy Benchmarking Program (statewide), which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record california:21654982:2024). AB 802 requires every California commercial building over 50,000 sq ft to report energy use to the CEC annually; the CEC publicly discloses the results statewide.
More multifamily housing buildings in California
- 6300 Lankershim Blvd· 61,640 sq ft · score 75 (B)
- Southern California Ii: Anaheim Memorial Manor· 61,635 sq ft · score 85 (A)
- The Waverly· 61,629 sq ft · score 74 (B)
- 2444 Alvarado St, Oxnard, Ca 93036, Usa· 61,624 sq ft · score 1 (D)
- 670 W San Jose Ave· 61,620 sq ft · score 73 (B)
- 7006 E Pkwy· 61,604 sq ft · score 84 (B)
- Multifamily Housing buildings in California· 10,630 benchmarked
- All California benchmarked buildings· AB 802 (Public Resources Code §25402.10)
- Most efficient large buildings in California
- Least efficient large buildings in California
- Biggest emitters in California
Frequently asked questions
What is 1150 Union Street's energy grade?
1150 Union Street scores 43 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2024 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 1150 Union Street use?
Its 2024 site energy-use intensity was 58.3 kBtu/ft² across 61,657 sq ft, including 160,836 kWh of electricity and 30,972 therms of natural gas.
What are 1150 Union Street's carbon emissions?
1150 Union Street reported 201 tCO₂e of greenhouse-gas emissions (3.3 kgCO₂e/ft²) for 2024.
Where is 1150 Union Street?
1150 Union Street is at 1150 Union Street, San Francisco, in San Francisco, California 94109. Its coordinates are 37.79945, -122.41852 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is 1150 Union Street and when was it built?
1150 Union Street has 61,657 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1930 as its year built. It is classed as multifamily housing.
Is 1150 Union Street covered by AB 802 (Public Resources Code §25402.10)?
Yes — it appears in the 2024 Building Energy Benchmarking Program (statewide) disclosure, which lists the buildings reporting under AB 802 (Public Resources Code §25402.10).
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About this data
Source: Building Energy Benchmarking Program (statewide) (AB 802 (Public Resources Code §25402.10)), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “1150 Union Street, San Francisco, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/1150-union-street-2f13f165 (data as of July 9, 2026).