Villa Siena - (Vs38) Essex
Multifamily Housing in California, CA · 1250 W Adams St, Costa Mesa · 92626
At a glance
Villa Siena - (Vs38) Essex is a 265,152-square-foot multifamily housing building at 1250 W Adams St, Costa Mesa in Costa Mesa, California, built in 1974. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 99 out of 100 (grade A), a site energy-use intensity of 28.0 kBtu/ft² and 434 tCO₂e of greenhouse-gas emissions. That score is higher than 71% 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 | 99 (band A) |
| Site EUI | 28.0 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 434 tCO₂e |
| GHG intensity | 1.6 kgCO₂e/ft² |
| Electricity | 803,451 kWh |
| Natural gas | 47,431 therms |
| Gross floor area | 265,152 sq ft |
| Source record | california:6797368:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 99 | ±0 | 28.0 kBtu/ft² | 434 tCO₂e |
| 2023 | 99 | -1 | 29.1 kBtu/ft² | 460 tCO₂e |
| 2022 | 100 | +34 | 29.0 kBtu/ft² | 451 tCO₂e |
| 2021 | 66 | -24 | 51.7 kBtu/ft² | 791 tCO₂e |
| 2020 | 90 | +4 | 37.4 kBtu/ft² | 572 tCO₂e |
| 2019 | 86 | 39.9 kBtu/ft² | 638 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
- 1250 W Adams St, Costa Mesa
- City
- California
- State
- California
- ZIP
- 92626
- Coordinates
- 33.71207, -117.88793
Within ~1 km
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See also: most efficient in California · biggest emitters
How does Villa Siena - (Vs38) Essex 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. Villa Siena - (Vs38) Essex's ENERGY STAR score of 99 compares with an average of 82 across the 9,612 that report a score; it scores higher than 71% of them and lower than 24%. Its site EUI of 28.0 kBtu/ft² is about 19% 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 1.6 kgCO₂e/ft² is about 22% below the group average of 2.1 kgCO₂e/ft².
At 265,152 sq ft, it is about 76% above the average floor area of 150,919 sq ft for those buildings. It was built in 1974, 14 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 Villa Siena - (Vs38) Essex's energy performance changed over time?
BuildingCensus holds 6 California disclosures for Villa Siena - (Vs38) Essex, covering report years 2019–2024. Its ENERGY STAR score went from 86 in 2019 to 99 in 2024 (+13 points); its best year on file was 2022, at 100. Site EUI moved from 39.9 kBtu/ft² (2019) to 28.0 kBtu/ft² (2024), a 30% decrease. Reported emissions went from 638 tCO₂e to 434 tCO₂e over the same span (down 32%).
What does an ENERGY STAR score of 99 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 99 means the building performs better than about 99% of its national peers. BuildingCensus bands the score into report-card grades; 99 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. Villa Siena - (Vs38) Essex's 28.0 kBtu/ft² across 265,152 sq ft works out to about 7.4 billion Btu (2,176 MWh-equivalent) in 2024. The disclosure also reports 803,451 kWh of electricity and 47,431 therms of natural gas for the year.
Which law requires Villa Siena - (Vs38) Essex to report its energy use?
Villa Siena - (Vs38) Essex 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:6797368:2024). 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
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- Mira Monte Apartment Homes - Essex (Mr435)· 264,847 sq ft · score 100 (A)
- Canyon Creek - 51020· 264,782 sq ft · score 94 (A)
- Landing Jack London Square - Essex (Ln58)· 264,706 sq ft · score 100 (A)
- Regency Palms - 29111· 264,703 sq ft · score 99 (A)
- 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 Villa Siena - (Vs38) Essex's energy grade?
Villa Siena - (Vs38) Essex scores 99 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 Villa Siena - (Vs38) Essex use?
Its 2024 site energy-use intensity was 28.0 kBtu/ft² across 265,152 sq ft, including 803,451 kWh of electricity and 47,431 therms of natural gas.
What are Villa Siena - (Vs38) Essex's carbon emissions?
Villa Siena - (Vs38) Essex reported 434 tCO₂e of greenhouse-gas emissions (1.6 kgCO₂e/ft²) for 2024.
Where is Villa Siena - (Vs38) Essex?
Villa Siena - (Vs38) Essex is at 1250 W Adams St, Costa Mesa, in Costa Mesa, California 92626. Its coordinates are 33.71207, -117.88793 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Villa Siena - (Vs38) Essex and when was it built?
Villa Siena - (Vs38) Essex has 265,152 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1974 as its year built. It is classed as multifamily housing.
Is Villa Siena - (Vs38) Essex 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, “Villa Siena - (Vs38) Essex, Costa Mesa, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/villa-siena-vs38-essex-84b70911 (data as of July 9, 2026).