1020 Union St
Mixed Residential in San Francisco, CA · 94133
At a glance
1020 Union St is a 75,500-square-foot mixed residential building in San Francisco, California, built in 1922. In its 2025 San Francisco benchmarking disclosure it reported an ENERGY STAR score of 54 out of 100 (grade D), a site energy-use intensity of 44.7 kBtu/ft² and 181 tCO₂e of greenhouse-gas emissions. That score is higher than 11% 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 | 54 (band D) |
| Site EUI | 44.7 kBtu/ft² |
| Source EUI | 55.3 kBtu/ft² |
| GHG emissions | 181 tCO₂e |
| GHG intensity | 2.4 kgCO₂e/ft² |
| Electricity | 105,025 kWh |
| Natural gas | 30,173 therms |
| Gross floor area | 75,500 sq ft |
| Source record | sf:0098/001:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 54 | 44.7 kBtu/ft² | 181 tCO₂e | |
| 2024 | — | — | — | |
| 2023 | — | — | — | |
| 2022 | — | — | — | |
| 2021 | 17 | 38.9 kBtu/ft² | 197 tCO₂e | |
| 2020 | — | 34.9 kBtu/ft² | 181 tCO₂e | |
| 2019 | 20 | -20 | 38.2 kBtu/ft² | 198 tCO₂e |
| 2018 | 40 | 33.6 kBtu/ft² | 175 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
- 1020 Union St
- City
- San Francisco
- State
- California
- ZIP
- 94133
- Coordinates
- 37.80003, -122.41628
Within ~1 km
Nearby benchmarked buildings
- The Fairmont San Franciscoscore 86
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- Fairmont Hotel - San Franciscoscore 83
Commercial · 804,136 sq ft
- 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
See also: most efficient in San Francisco · biggest emitters
How does 1020 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. 1020 Union St's ENERGY STAR score of 54 compares with an average of 85 across the 340 that report a score; it scores higher than 11% of them and lower than 89%. Its site EUI of 44.7 kBtu/ft² is about 24% 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 2.4 kgCO₂e/ft² is about 20% above the group average of 2.0 kgCO₂e/ft².
At 75,500 sq ft, it is about half of the average floor area of 165,572 sq ft for those buildings. It was built in 1922, 44 years earlier than the group's average year built (1967).
How has 1020 Union St's energy performance changed over time?
BuildingCensus holds 8 San Francisco disclosures for 1020 Union St, covering report years 2018–2025. Its ENERGY STAR score went from 40 in 2018 to 54 in 2025 (+14 points). Site EUI moved from 33.6 kBtu/ft² (2018) to 44.7 kBtu/ft² (2025), an 33% increase. Reported emissions went from 175 tCO₂e to 181 tCO₂e over the same span (up 3%).
What does an ENERGY STAR score of 54 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 54 means the building performs better than about 54% of its national peers. BuildingCensus bands the score into report-card grades; 54 falls in band D — lowest band (1–54). It sits 21 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. 1020 Union St's 44.7 kBtu/ft² across 75,500 sq ft works out to about 3.4 billion Btu (989 MWh-equivalent) in 2025. Its source EUI of 55.3 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 105,025 kWh of electricity and 30,173 therms of natural gas for the year.
Which law requires 1020 Union St to report its energy use?
1020 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:0098/001:2025). 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
- 200 PORTOLA DR· 75,000 sq ft · score 100 (A)
- 208 PENNSYLVANIA AVE· 75,000 sq ft · score 100 (A)
- 755 MASON ST· 74,525 sq ft
- Arnett Watson Apartments· 74,500 sq ft
- 3550 CESAR CHAVEZ ST· 74,457 sq ft · score 100 (A)
- 378 GOLDEN GATE AVE· 74,390 sq ft · score 43 (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 1020 Union St's energy grade?
1020 Union St scores 54 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 1020 Union St use?
Its 2025 site energy-use intensity was 44.7 kBtu/ft² (55.3 kBtu/ft² source) across 75,500 sq ft, including 105,025 kWh of electricity and 30,173 therms of natural gas.
What are 1020 Union St's carbon emissions?
1020 Union St reported 181 tCO₂e of greenhouse-gas emissions (2.4 kgCO₂e/ft²) for 2025.
Where is 1020 Union St?
1020 Union St is in San Francisco, California 94133. Its coordinates are 37.80003, -122.41628 (latitude, longitude), as published in the Existing Buildings Energy Performance Ordinance file.
How big is 1020 Union St and when was it built?
1020 Union St has 75,500 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1922 as its year built. It is classed as mixed residential.
Is 1020 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, “1020 Union St, San Francisco, California — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/san-francisco/1020-union-st-41dcf700 (data as of October 2, 2026).