The Diplomat Apartments
Multifamily Housing in California, CA · 6621 Montezuma Road, San Diego · 92115
At a glance
The Diplomat Apartments is a 51,776-square-foot multifamily housing building at 6621 Montezuma Road, San Diego in San Diego, California, built in 1986. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 29 out of 100 (grade D), a site energy-use intensity of 49.4 kBtu/ft² and 151 tCO₂e of greenhouse-gas emissions. That score is higher than 5% 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 | 29 (band D) |
| Site EUI | 49.4 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 151 tCO₂e |
| GHG intensity | 2.9 kgCO₂e/ft² |
| Electricity | 270,910 kWh |
| Natural gas | 16,941 therms |
| Gross floor area | 51,776 sq ft |
| Source record | california:25587593:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 29 | -55 | 49.4 kBtu/ft² | 151 tCO₂e |
| 2023 | 84 | +7 | 28.6 kBtu/ft² | 93 tCO₂e |
| 2022 | 77 | 28.2 kBtu/ft² | 94 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
- 6621 Montezuma Road, San Diego
- City
- California
- State
- California
- ZIP
- 92115
- Coordinates
- 32.76869, -117.05656
Within ~1 km
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See also: most efficient in California · biggest emitters
How does The Diplomat Apartments 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. The Diplomat Apartments's ENERGY STAR score of 29 compares with an average of 82 across the 9,612 that report a score; it scores higher than 5% of them and lower than 95%. Its site EUI of 49.4 kBtu/ft² is about 44% 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 2.9 kgCO₂e/ft² is about 39% above the group average of 2.1 kgCO₂e/ft².
At 51,776 sq ft, it is about 66% below the average floor area of 150,919 sq ft for those buildings. Its 1986 construction date is close to 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 The Diplomat Apartments's energy performance changed over time?
BuildingCensus holds 3 California disclosures for The Diplomat Apartments, covering report years 2022–2024. Its ENERGY STAR score went from 77 in 2022 to 29 in 2024 (-48 points); its best year on file was 2023, at 84. Site EUI moved from 28.2 kBtu/ft² (2022) to 49.4 kBtu/ft² (2024), an 75% increase. Reported emissions went from 94 tCO₂e to 151 tCO₂e over the same span (up 61%).
What does an ENERGY STAR score of 29 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 29 means the building performs better than about 29% of its national peers. BuildingCensus bands the score into report-card grades; 29 falls in band D — lowest band (1–54). It sits 46 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. The Diplomat Apartments's 49.4 kBtu/ft² across 51,776 sq ft works out to about 2.6 billion Btu (750 MWh-equivalent) in 2024. The disclosure also reports 270,910 kWh of electricity and 16,941 therms of natural gas for the year.
Which law requires The Diplomat Apartments to report its energy use?
The Diplomat Apartments 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:25587593:2024). 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
- Amalfi (Ml10)· 51,772 sq ft · score 100 (A)
- Countryside Villas· 51,770 sq ft · score 26 (D)
- Three21 (Th520)· 51,750 sq ft · score 96 (A)
- 1508 Veteran Avenue - Ladbs· 51,724 sq ft · score 97 (A)
- Holly Courts· 51,723 sq ft · score 99 (A)
- 25 Sanchez Mission· 51,723 sq ft · score 54 (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 The Diplomat Apartments's energy grade?
The Diplomat Apartments scores 29 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 The Diplomat Apartments use?
Its 2024 site energy-use intensity was 49.4 kBtu/ft² across 51,776 sq ft, including 270,910 kWh of electricity and 16,941 therms of natural gas.
What are The Diplomat Apartments's carbon emissions?
The Diplomat Apartments reported 151 tCO₂e of greenhouse-gas emissions (2.9 kgCO₂e/ft²) for 2024.
Where is The Diplomat Apartments?
The Diplomat Apartments is at 6621 Montezuma Road, San Diego, in San Diego, California 92115. Its coordinates are 32.76869, -117.05656 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is The Diplomat Apartments and when was it built?
The Diplomat Apartments has 51,776 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1986 as its year built. It is classed as multifamily housing.
Is The Diplomat Apartments 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, “The Diplomat Apartments, San Diego, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/the-diplomat-apartments-1206976c (data as of July 9, 2026).