Hotel Isabel
Mixed Residential in San Francisco, CA · 1091 MISSION ST · 94103
At a glance
Hotel Isabel is a 94,429-square-foot mixed residential building at 1091 MISSION ST in San Francisco, California, built in 1912. In its 2025 San Francisco benchmarking disclosure it reported an ENERGY STAR score of 29 out of 100 (grade D), a site energy-use intensity of 39.1 kBtu/ft² and 200 tCO₂e of greenhouse-gas emissions. That score is higher than 4% 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 | 29 (band D) |
| Site EUI | 39.1 kBtu/ft² |
| Source EUI | 60.2 kBtu/ft² |
| GHG emissions | 200 tCO₂e |
| GHG intensity | 2.1 kgCO₂e/ft² |
| Electricity | 303,015 kWh |
| Natural gas | 26,591 therms |
| Gross floor area | 94,429 sq ft |
| Source record | sf:3726/105:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 29 | +9 | 39.1 kBtu/ft² | 200 tCO₂e |
| 2024 | 20 | +6 | 42.5 kBtu/ft² | 228 tCO₂e |
| 2023 | 14 | -4 | 42.0 kBtu/ft² | 231 tCO₂e |
| 2022 | 18 | 41.5 kBtu/ft² | 227 tCO₂e | |
| 2021 | — | 44.8 kBtu/ft² | 237 tCO₂e | |
| 2020 | — | 44.4 kBtu/ft² | 240 tCO₂e | |
| 2019 | — | 41.2 kBtu/ft² | 224 tCO₂e | |
| 2018 | 62 | 40.8 kBtu/ft² | 222 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
- 1091 MISSION ST
- City
- San Francisco
- State
- California
- ZIP
- 94103
- Coordinates
- 37.77921, -122.41054
Within ~1 km
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How does Hotel Isabel 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. Hotel Isabel's ENERGY STAR score of 29 compares with an average of 85 across the 340 that report a score; it scores higher than 4% of them and lower than 96%. Its site EUI of 39.1 kBtu/ft² is roughly in line with the average of 36.0 kBtu/ft². Its emissions intensity of 2.1 kgCO₂e/ft² is roughly in line with the group average of 2.0 kgCO₂e/ft².
At 94,429 sq ft, it is about 43% below the average floor area of 165,572 sq ft for those buildings. It was built in 1912, 54 years earlier than the group's average year built (1967).
How has Hotel Isabel's energy performance changed over time?
BuildingCensus holds 8 San Francisco disclosures for Hotel Isabel, covering report years 2018–2025. Its ENERGY STAR score went from 62 in 2018 to 29 in 2025 (-33 points); its best year on file was 2018, at 62. Site EUI moved from 40.8 kBtu/ft² (2018) to 39.1 kBtu/ft² (2025), a 4% decrease. Reported emissions went from 222 tCO₂e to 200 tCO₂e over the same span (down 10%).
What does an ENERGY STAR score of 29 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 29 means the building performs better than about 29% of its national peers. BuildingCensus bands the score into report-card grades; 29 falls in band D — lowest band (1–54). It sits 46 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. Hotel Isabel's 39.1 kBtu/ft² across 94,429 sq ft works out to about 3.7 billion Btu (1,082 MWh-equivalent) in 2025. Its source EUI of 60.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 303,015 kWh of electricity and 26,591 therms of natural gas for the year.
Which law requires Hotel Isabel to report its energy use?
Hotel Isabel 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:3726/105:2025). 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
- 1201 GOLDEN GATE AVE· 94,235 sq ft
- 1333 PACIFIC AVE· 94,078 sq ft
- Eugene Coleman House· 93,600 sq ft · EUI 35.3 kBtu/ft²
- 310 TOWNSEND ST· 92,647 sq ft
- 1325 INDIANA ST· 92,546 sq ft · score 100 (A)
- Canon Barcus Community House· 92,009 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 Hotel Isabel's energy grade?
Hotel Isabel scores 29 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 Hotel Isabel use?
Its 2025 site energy-use intensity was 39.1 kBtu/ft² (60.2 kBtu/ft² source) across 94,429 sq ft, including 303,015 kWh of electricity and 26,591 therms of natural gas.
What are Hotel Isabel's carbon emissions?
Hotel Isabel reported 200 tCO₂e of greenhouse-gas emissions (2.1 kgCO₂e/ft²) for 2025.
Where is Hotel Isabel?
Hotel Isabel is at 1091 MISSION ST, in San Francisco, California 94103. Its coordinates are 37.77921, -122.41054 (latitude, longitude), as published in the Existing Buildings Energy Performance Ordinance file.
How big is Hotel Isabel and when was it built?
Hotel Isabel has 94,429 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1912 as its year built. It is classed as mixed residential.
Is Hotel Isabel 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, “Hotel Isabel, San Francisco, California — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/san-francisco/hotel-isabel-401a3450 (data as of October 2, 2026).