Iron Works Lofts
Multifamily Housing in California, CA · 1219 Harrison Street, San Francisco · 94103
At a glance
Iron Works Lofts is a 71,755-square-foot multifamily housing building at 1219 Harrison Street, San Francisco in San Francisco, California, built in 2004. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 97 out of 100 (grade A), a site energy-use intensity of 19.9 kBtu/ft² and 84 tCO₂e of greenhouse-gas emissions. That score is higher than 63% 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 | 97 (band A) |
| Site EUI | 19.9 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 84 tCO₂e |
| GHG intensity | 1.2 kgCO₂e/ft² |
| Electricity | 159,486 kWh |
| Natural gas | 8,951 therms |
| Gross floor area | 71,755 sq ft |
| Source record | california:15741236:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 97 | ±0 | 19.9 kBtu/ft² | 84 tCO₂e |
| 2023 | 97 | -2 | 20.1 kBtu/ft² | 85 tCO₂e |
| 2022 | 99 | +1 | 19.0 kBtu/ft² | 80 tCO₂e |
| 2021 | 98 | +2 | 19.8 kBtu/ft² | 79 tCO₂e |
| 2020 | 96 | 21.7 kBtu/ft² | 88 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
- 1219 Harrison Street, San Francisco
- City
- California
- State
- California
- ZIP
- 94103
- Coordinates
- 37.77318, -122.40875
Within ~1 km
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See also: most efficient in California · biggest emitters
How does Iron Works Lofts 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. Iron Works Lofts's ENERGY STAR score of 97 compares with an average of 82 across the 9,612 that report a score; it scores higher than 63% of them and lower than 34%. Its site EUI of 19.9 kBtu/ft² is about 42% below the average of 34.4 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 1.2 kgCO₂e/ft² is about 44% below the group average of 2.1 kgCO₂e/ft².
At 71,755 sq ft, it is about half of the average floor area of 150,919 sq ft for those buildings. It was built in 2004, 16 years later 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 Iron Works Lofts's energy performance changed over time?
BuildingCensus holds 5 California disclosures for Iron Works Lofts, covering report years 2020–2024. Its ENERGY STAR score went from 96 in 2020 to 97 in 2024 (+1 points); its best year on file was 2022, at 99. Site EUI moved from 21.7 kBtu/ft² (2020) to 19.9 kBtu/ft² (2024), a 8% decrease. Reported emissions went from 88 tCO₂e to 84 tCO₂e over the same span (down 5%).
What does an ENERGY STAR score of 97 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 97 means the building performs better than about 97% of its national peers. BuildingCensus bands the score into report-card grades; 97 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 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. Iron Works Lofts's 19.9 kBtu/ft² across 71,755 sq ft works out to about 1.4 billion Btu (418 MWh-equivalent) in 2024. The disclosure also reports 159,486 kWh of electricity and 8,951 therms of natural gas for the year.
Which law requires Iron Works Lofts to report its energy use?
Iron Works Lofts 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:15741236:2024). 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
- Washington Plaza· 71,748 sq ft · score 84 (B)
- 333 North Indiana Street - Ab802· 71,746 sq ft · score 91 (A)
- Don De Dios - Total· 71,745 sq ft · score 100 (A)
- 2431 E El Segundo Blvd· 71,734 sq ft · score 64 (C)
- Hillside Village Apartments (Hl161)· 71,729 sq ft · score 89 (A)
- The Meridian Apartments· 71,724 sq ft · EUI 29.2 kBtu/ft²
- 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 Iron Works Lofts's energy grade?
Iron Works Lofts scores 97 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2024 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Iron Works Lofts use?
Its 2024 site energy-use intensity was 19.9 kBtu/ft² across 71,755 sq ft, including 159,486 kWh of electricity and 8,951 therms of natural gas.
What are Iron Works Lofts's carbon emissions?
Iron Works Lofts reported 84 tCO₂e of greenhouse-gas emissions (1.2 kgCO₂e/ft²) for 2024.
Where is Iron Works Lofts?
Iron Works Lofts is at 1219 Harrison Street, San Francisco, in San Francisco, California 94103. Its coordinates are 37.77318, -122.40875 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Iron Works Lofts and when was it built?
Iron Works Lofts has 71,755 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2004 as its year built. It is classed as multifamily housing.
Is Iron Works Lofts 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, “Iron Works Lofts, San Francisco, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/iron-works-lofts-64a9c4c4 (data as of July 9, 2026).