Harbor Gateway Hi-Tech #1
Office in California, CA · 3565 Harbor Boulevard, Costa Mesa · 92626
At a glance
Harbor Gateway Hi-Tech #1 is a 64,939-square-foot office building at 3565 Harbor Boulevard, Costa Mesa in Costa Mesa, California, built in 1987. In its 2024 California benchmarking disclosure it reported a site energy-use intensity of 64.6 kBtu/ft² and 250 tCO₂e of greenhouse-gas emissions.
AB 802 (Public Resources Code §25402.10) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 64.6 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 250 tCO₂e |
| GHG intensity | 3.9 kgCO₂e/ft² |
| Electricity | 599,975 kWh |
| Natural gas | 21,495 therms |
| Gross floor area | 64,939 sq ft |
| Source record | california:6352175:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 64.6 kBtu/ft² | 250 tCO₂e | |
| 2023 | — | 52.0 kBtu/ft² | 213 tCO₂e | |
| 2022 | — | 3.6 kBtu/ft² | 17 tCO₂e | |
| 2021 | — | 1.0 kBtu/ft² | 4 tCO₂e | |
| 2020 | — | 1.1 kBtu/ft² | 5 tCO₂e | |
| 2019 | — | 2.8 kBtu/ft² | 12 tCO₂e | |
| 2018 | — | 6.6 kBtu/ft² | 29 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
- 3565 Harbor Boulevard, Costa Mesa
- City
- California
- State
- California
- ZIP
- 92626
- Coordinates
- 33.69978, -117.92021
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
- Costa Mesa Business Centerscore —
Non-Refrigerated Warehouse · 150,122 sq ft
Retail Store · 134,400 sq ft
Distribution Center · 122,060 sq ft
- 1660 Scenic Avescore 5
Non-Refrigerated Warehouse · 120,835 sq ft
See also: most efficient in California · biggest emitters
How does Harbor Gateway Hi-Tech #1 compare with other office buildings in California?
The latest disclosures cover 6,214 office buildings in California, out of 40,029 buildings citywide. Its site EUI of 64.6 kBtu/ft² is about 15% 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 3.9 kgCO₂e/ft² is roughly in line with the group average of 3.6 kgCO₂e/ft².
At 64,939 sq ft, it is about 57% below the average floor area of 151,937 sq ft for those buildings. Its 1987 construction date is close to 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 #1's energy performance changed over time?
BuildingCensus holds 7 California disclosures for Harbor Gateway Hi-Tech #1, covering report years 2018–2024. Site EUI moved from 6.6 kBtu/ft² (2018) to 64.6 kBtu/ft² (2024), an 879% increase. Reported emissions went from 29 tCO₂e to 250 tCO₂e over the same span (up 756%).
What does a site EUI of 64.6 kBtu/ft² mean?
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 #1's 64.6 kBtu/ft² across 64,939 sq ft works out to about 4.2 billion Btu (1,229 MWh-equivalent) in 2024. The disclosure also reports 599,975 kWh of electricity and 21,495 therms of natural gas for the year.
Which law requires Harbor Gateway Hi-Tech #1 to report its energy use?
Harbor Gateway Hi-Tech #1 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:6352175:2024). 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
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- 500 Sutter St, San Francisco, Ca 94108, Usa· 64,876 sq ft · score 73 (B)
- 925 N. La Brea· 64,831 sq ft · EUI 39.1 kBtu/ft²
- Bmr-Wateridge Pointe-10431· 64,824 sq ft · score 57 (C)
- 6171 W Century Blvd, Los Angeles, Ca 90045, Usa· 64,821 sq ft · score 1 (D)
- 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 #1's energy grade?
Harbor Gateway Hi-Tech #1 did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 64.6 kBtu/ft².
How much energy does Harbor Gateway Hi-Tech #1 use?
Its 2024 site energy-use intensity was 64.6 kBtu/ft² across 64,939 sq ft, including 599,975 kWh of electricity and 21,495 therms of natural gas.
What are Harbor Gateway Hi-Tech #1's carbon emissions?
Harbor Gateway Hi-Tech #1 reported 250 tCO₂e of greenhouse-gas emissions (3.9 kgCO₂e/ft²) for 2024.
Where is Harbor Gateway Hi-Tech #1?
Harbor Gateway Hi-Tech #1 is at 3565 Harbor Boulevard, Costa Mesa, in Costa Mesa, California 92626. Its coordinates are 33.69978, -117.92021 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Harbor Gateway Hi-Tech #1 and when was it built?
Harbor Gateway Hi-Tech #1 has 64,939 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1987 as its year built. It is classed as office.
Is Harbor Gateway Hi-Tech #1 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 #1, Costa Mesa, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/harbor-gateway-hi-tech-1-319e4b46 (data as of July 9, 2026).