Harbor Gateway Hi-Tech #B
Office in California, CA · 3545 Harbor Gateway North, Costa Mesa · 92626
At a glance
Harbor Gateway Hi-Tech #B is a 70,382-square-foot office building at 3545 Harbor Gateway North, Costa Mesa in Costa Mesa, California, built in 1965. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 32 out of 100 (grade D), a site energy-use intensity of 81.3 kBtu/ft² and 370 tCO₂e of greenhouse-gas emissions. That score is higher than 10% of the 4,912 scored office buildings in California.
AB 802 (Public Resources Code §25402.10) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 32 (band D) |
| Site EUI | 81.3 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 370 tCO₂e |
| GHG intensity | 5.3 kgCO₂e/ft² |
| Electricity | 1,635,786 kWh |
| Gross floor area | 70,382 sq ft |
| Source record | california:6352501:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 32 | +6 | 81.3 kBtu/ft² | 370 tCO₂e |
| 2023 | 26 | -5 | 85.4 kBtu/ft² | 428 tCO₂e |
| 2022 | 31 | -1 | 77.9 kBtu/ft² | 405 tCO₂e |
| 2021 | 32 | -6 | 81.7 kBtu/ft² | 397 tCO₂e |
| 2020 | 38 | -3 | 72.0 kBtu/ft² | 360 tCO₂e |
| 2019 | 41 | -2 | 72.2 kBtu/ft² | 348 tCO₂e |
| 2018 | 43 | 69.2 kBtu/ft² | 350 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.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 3545 Harbor Gateway North, Costa Mesa
- City
- California
- State
- California
- ZIP
- 92626
- Coordinates
- 33.70000, -117.92391
Within ~1 km
Nearby benchmarked buildings
- 1665 Macarthur Blvdscore 15
Non-Refrigerated Warehouse · 181,247 sq ft
- Commerce Park (Costa Mesa)score —
Non-Refrigerated Warehouse · 177,813 sq ft
- Kingston Technology (M)score —
Manufacturing/Industrial Plant · 171,025 sq ft
- Costco #00411 Fountain Valleyscore 69
Supermarket/Grocery Store · 151,870 sq ft
- Costa Mesa Business Centerscore —
Non-Refrigerated Warehouse · 150,122 sq ft
Retail Store · 134,400 sq ft
See also: most efficient in California · biggest emitters
How does Harbor Gateway Hi-Tech #B compare with other office buildings in California?
The latest disclosures cover 6,214 office buildings in California, out of 40,029 buildings citywide. Harbor Gateway Hi-Tech #B's ENERGY STAR score of 32 compares with an average of 75 across the 4,912 that report a score; it scores higher than 10% of them and lower than 90%. Its site EUI of 81.3 kBtu/ft² is about 44% above the average of 56.4 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 5.3 kgCO₂e/ft² is about 46% above the group average of 3.6 kgCO₂e/ft².
At 70,382 sq ft, it is about half of the average floor area of 151,937 sq ft for those buildings. It was built in 1965, 20 years earlier than the group's average year built (1985). Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
How has Harbor Gateway Hi-Tech #B's energy performance changed over time?
BuildingCensus holds 7 California disclosures for Harbor Gateway Hi-Tech #B, covering report years 2018–2024. Its ENERGY STAR score went from 43 in 2018 to 32 in 2024 (-11 points); its best year on file was 2018, at 43. Site EUI moved from 69.2 kBtu/ft² (2018) to 81.3 kBtu/ft² (2024), an 17% increase. Reported emissions went from 350 tCO₂e to 370 tCO₂e over the same span (up 6%).
What does an ENERGY STAR score of 32 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 32 means the building performs better than about 32% of its national peers. BuildingCensus bands the score into report-card grades; 32 falls in band D — lowest band (1–54). It sits 43 points below 75, the threshold for ENERGY STAR certification. 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. Harbor Gateway Hi-Tech #B's 81.3 kBtu/ft² across 70,382 sq ft works out to about 5.7 billion Btu (1,677 MWh-equivalent) in 2024. The disclosure also reports 1,635,786 kWh of electricity for the year.
Which law requires Harbor Gateway Hi-Tech #B to report its energy use?
Harbor Gateway Hi-Tech #B 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:6352501:2024). 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 office buildings in California
- 300 Wind River· 70,265 sq ft · EUI 1.7 kBtu/ft²
- Harbor Gateway Hi-Tech #2· 70,251 sq ft · score 87 (A)
- Citrus Center· 70,202 sq ft
- 21339 Nordhoff St· 70,172 sq ft · score 22 (D)
- Sutter Health-1651 Exposition Blvd Sacramento Ca· 70,105 sq ft · score 98 (A)
- Franklin St Building· 70,100 sq ft · score 89 (A)
- Office buildings in California· 6,214 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 Harbor Gateway Hi-Tech #B's energy grade?
Harbor Gateway Hi-Tech #B scores 32 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2024 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Harbor Gateway Hi-Tech #B use?
Its 2024 site energy-use intensity was 81.3 kBtu/ft² across 70,382 sq ft, including 1,635,786 kWh of electricity.
What are Harbor Gateway Hi-Tech #B's carbon emissions?
Harbor Gateway Hi-Tech #B reported 370 tCO₂e of greenhouse-gas emissions (5.3 kgCO₂e/ft²) for 2024.
Where is Harbor Gateway Hi-Tech #B?
Harbor Gateway Hi-Tech #B is at 3545 Harbor Gateway North, Costa Mesa, in Costa Mesa, California 92626. Its coordinates are 33.70000, -117.92391 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Harbor Gateway Hi-Tech #B and when was it built?
Harbor Gateway Hi-Tech #B has 70,382 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1965 as its year built. It is classed as office.
Is Harbor Gateway Hi-Tech #B 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, “Harbor Gateway Hi-Tech #B, Costa Mesa, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/harbor-gateway-hi-tech-b-e68305dd (data as of July 9, 2026).