Ironwood Apartments (Rn78)
Multifamily Housing in California, CA · 5643 Charlotte Way, Livermore · 94550
At a glance
Ironwood Apartments (Rn78) is a 192,000-square-foot multifamily housing building at 5643 Charlotte Way, Livermore in Livermore, California, built in 1973. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 75 out of 100 (grade B), a site energy-use intensity of 42.2 kBtu/ft² and 469 tCO₂e of greenhouse-gas emissions. That score is higher than 27% 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 | 75 (band B) |
| Site EUI | 42.2 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 469 tCO₂e |
| GHG intensity | 2.4 kgCO₂e/ft² |
| Electricity | 991,453 kWh |
| Natural gas | 46,053 therms |
| Gross floor area | 192,000 sq ft |
| Source record | california:4681066:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 75 | +6 | 42.2 kBtu/ft² | 469 tCO₂e |
| 2023 | 69 | ±0 | 48.0 kBtu/ft² | 549 tCO₂e |
| 2022 | 69 | +9 | 49.3 kBtu/ft² | 555 tCO₂e |
| 2021 | 60 | -5 | 51.8 kBtu/ft² | 545 tCO₂e |
| 2020 | 65 | +1 | 50.5 kBtu/ft² | 555 tCO₂e |
| 2019 | 64 | 50.0 kBtu/ft² | 533 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
- 5643 Charlotte Way, Livermore
- City
- California
- State
- California
- ZIP
- 94550
- Coordinates
- 37.68135, -121.72645
Within ~1 km
Nearby benchmarked buildings
- Stoney Creek - Total (Sy21)score 82
Multifamily Housing · 128,860 sq ft
- Livermore Gardensscore 94
Multifamily Housing · 99,550 sq ft
See also: most efficient in California · biggest emitters
How does Ironwood Apartments (Rn78) 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. Ironwood Apartments (Rn78)'s ENERGY STAR score of 75 compares with an average of 82 across the 9,612 that report a score; it scores higher than 27% of them and lower than 72%. Its site EUI of 42.2 kBtu/ft² is about 23% 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 2.4 kgCO₂e/ft² is about 16% above the group average of 2.1 kgCO₂e/ft².
At 192,000 sq ft, it is about 27% above the average floor area of 150,919 sq ft for those buildings. It was built in 1973, 15 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 Ironwood Apartments (Rn78)'s energy performance changed over time?
BuildingCensus holds 6 California disclosures for Ironwood Apartments (Rn78), covering report years 2019–2024. Its ENERGY STAR score went from 64 in 2019 to 75 in 2024 (+11 points). Site EUI moved from 50.0 kBtu/ft² (2019) to 42.2 kBtu/ft² (2024), a 16% decrease. Reported emissions went from 533 tCO₂e to 469 tCO₂e over the same span (down 12%).
What does an ENERGY STAR score of 75 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 75 means the building performs better than about 75% of its national peers. BuildingCensus bands the score into report-card grades; 75 falls in band B — above median (70–84). 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. Ironwood Apartments (Rn78)'s 42.2 kBtu/ft² across 192,000 sq ft works out to about 8.1 billion Btu (2,375 MWh-equivalent) in 2024. The disclosure also reports 991,453 kWh of electricity and 46,053 therms of natural gas for the year.
Which law requires Ironwood Apartments (Rn78) to report its energy use?
Ironwood Apartments (Rn78) 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:4681066:2024). 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
- 1115 N Citron St· 191,952 sq ft · score 100 (A)
- Winsted Apartments (Wn084)· 191,894 sq ft · score 67 (C)
- Willow View· 191,814 sq ft · score 100 (A)
- Belmont (11127)· 191,641 sq ft · score 84 (B)
- Village Townhomes (Vg95)· 191,600 sq ft · score 100 (A)
- Glenwood· 191,500 sq ft · score 49 (D)
- 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 Ironwood Apartments (Rn78)'s energy grade?
Ironwood Apartments (Rn78) scores 75 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2024 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Ironwood Apartments (Rn78) use?
Its 2024 site energy-use intensity was 42.2 kBtu/ft² across 192,000 sq ft, including 991,453 kWh of electricity and 46,053 therms of natural gas.
What are Ironwood Apartments (Rn78)'s carbon emissions?
Ironwood Apartments (Rn78) reported 469 tCO₂e of greenhouse-gas emissions (2.4 kgCO₂e/ft²) for 2024.
Where is Ironwood Apartments (Rn78)?
Ironwood Apartments (Rn78) is at 5643 Charlotte Way, Livermore, in Livermore, California 94550. Its coordinates are 37.68135, -121.72645 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Ironwood Apartments (Rn78) and when was it built?
Ironwood Apartments (Rn78) has 192,000 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1973 as its year built. It is classed as multifamily housing.
Is Ironwood Apartments (Rn78) 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, “Ironwood Apartments (Rn78), Livermore, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/ironwood-apartments-rn78-fa810a5a (data as of July 9, 2026).