Southern California Ii: Harbor Tower
Multifamily Housing in California, CA · 340 South Mesa Street, Los Angeles · 90731
At a glance
Southern California Ii: Harbor Tower is a 135,389-square-foot multifamily housing building at 340 South Mesa Street, Los Angeles in Los Angeles, California, built in 1976. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 87 out of 100 (grade A), a site energy-use intensity of 31.7 kBtu/ft² and 262 tCO₂e of greenhouse-gas emissions. That score is higher than 42% 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 | 87 (band A) |
| Site EUI | 31.7 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 262 tCO₂e |
| GHG intensity | 1.9 kgCO₂e/ft² |
| Electricity | 800,160 kWh |
| Gross floor area | 135,389 sq ft |
| Source record | california:5041799:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 87 | +2 | 31.7 kBtu/ft² | 262 tCO₂e |
| 2023 | 85 | +1 | 32.5 kBtu/ft² | 285 tCO₂e |
| 2022 | 84 | -4 | 33.7 kBtu/ft² | 288 tCO₂e |
| 2021 | 88 | +2 | 31.0 kBtu/ft² | 247 tCO₂e |
| 2020 | 86 | ±0 | — | 278 tCO₂e |
| 2019 | 86 | 33.7 kBtu/ft² | 294 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
- 340 South Mesa Street, Los Angeles
- City
- California
- State
- California
- ZIP
- 90731
- Coordinates
- 33.74070, -118.28541
Within ~1 km
Nearby benchmarked buildings
- 550 Harborfront, Palos Verdesscore 99
Multifamily Housing · 459,903 sq ft
- The Vue (Wt136;P-1409)score 84
Multifamily Housing · 429,461 sq ft
- Carmel Vue-Greystarscore 73
Multifamily Housing · 400,000 sq ft
Office · 262,679 sq ft
- Topazscore 99
Office · 262,679 sq ft
- San Pedro Bank Loftsscore —
Multifamily Housing · 128,201 sq ft
See also: most efficient in California · biggest emitters
How does Southern California Ii: Harbor Tower 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. Southern California Ii: Harbor Tower's ENERGY STAR score of 87 compares with an average of 82 across the 9,612 that report a score; it scores higher than 42% of them and lower than 57%. Its site EUI of 31.7 kBtu/ft² is roughly in line with 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 1.9 kgCO₂e/ft² is roughly in line with the group average of 2.1 kgCO₂e/ft².
At 135,389 sq ft, it is about 10% below the average floor area of 150,919 sq ft for those buildings. It was built in 1976, 12 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 Southern California Ii: Harbor Tower's energy performance changed over time?
BuildingCensus holds 6 California disclosures for Southern California Ii: Harbor Tower, covering report years 2019–2024. Its ENERGY STAR score went from 86 in 2019 to 87 in 2024 (+1 points); its best year on file was 2021, at 88. Site EUI moved from 33.7 kBtu/ft² (2019) to 31.7 kBtu/ft² (2024), a 6% decrease. Reported emissions went from 294 tCO₂e to 262 tCO₂e over the same span (down 11%).
What does an ENERGY STAR score of 87 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 87 means the building performs better than about 87% of its national peers. BuildingCensus bands the score into report-card grades; 87 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. Southern California Ii: Harbor Tower's 31.7 kBtu/ft² across 135,389 sq ft works out to about 4.3 billion Btu (1,258 MWh-equivalent) in 2024. The disclosure also reports 800,160 kWh of electricity for the year.
Which law requires Southern California Ii: Harbor Tower to report its energy use?
Southern California Ii: Harbor Tower 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:5041799:2024). 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
- 719 S Knott Ave· 135,372 sq ft · score 96 (A)
- Fountainglen Rancho Santa Margarita· 135,320 sq ft · score 33 (D)
- Fountainglen At Rancho Santa Margarita (Fn34)· 135,320 sq ft · score 74 (B)
- Brookside Park Apartments (23734)· 135,234 sq ft · score 100 (A)
- 175 Bluxome St· 135,229 sq ft · score 97 (A)
- Aquatic Iii (Qt010)· 135,136 sq ft · score 97 (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 Southern California Ii: Harbor Tower's energy grade?
Southern California Ii: Harbor Tower scores 87 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 Southern California Ii: Harbor Tower use?
Its 2024 site energy-use intensity was 31.7 kBtu/ft² across 135,389 sq ft, including 800,160 kWh of electricity.
What are Southern California Ii: Harbor Tower's carbon emissions?
Southern California Ii: Harbor Tower reported 262 tCO₂e of greenhouse-gas emissions (1.9 kgCO₂e/ft²) for 2024.
Where is Southern California Ii: Harbor Tower?
Southern California Ii: Harbor Tower is at 340 South Mesa Street, Los Angeles, in Los Angeles, California 90731. Its coordinates are 33.74070, -118.28541 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Southern California Ii: Harbor Tower and when was it built?
Southern California Ii: Harbor Tower has 135,389 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1976 as its year built. It is classed as multifamily housing.
Is Southern California Ii: Harbor Tower 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).
Working with California building benchmarking records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Southern California Ii: Harbor Tower, Los Angeles, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/southern-california-ii-harbor-tower-9bee6927 (data as of July 9, 2026).