Iwilei Business Center AOAO
Other in Honolulu, HI · 501 Sumner St, Honolulu
At a glance
Iwilei Business Center AOAO is a 224,380-square-foot other building at 501 Sumner St, Honolulu in Honolulu, Hawaii, built in 1919. In its 2025 Honolulu benchmarking disclosure it reported a site energy-use intensity of 29.4 kBtu/ft² and 1,380 tCO₂e of greenhouse-gas emissions.
Ordinance 22-17 (City & County of Honolulu) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 29.4 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 1,380 tCO₂e |
| GHG intensity | — |
| Electricity | 1,911,395 kWh |
| Natural gas | 774 therms |
| Water use | 3,453 kgal |
| Gross floor area | 224,380 sq ft |
| Source record | honolulu:04QFJ1730057651:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 29.4 kBtu/ft² | 1,380 tCO₂e | |
| 2024 | — | 29.6 kBtu/ft² | 1,436 tCO₂e | |
| 2023 | — | 26.9 kBtu/ft² | 1,258 tCO₂e |
Compliance context
Ordinance 22-17 (City & County of Honolulu)
Honolulu's Ordinance 22-17 requires commercial buildings over 25,000 sq ft on Oʻahu to benchmark annually, with public disclosure of results.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 501 Sumner St, Honolulu
- City
- Honolulu
- State
- Hawaii
Within ~1 km
Nearby benchmarked buildings
This source publishes no coordinates, so nearby buildings can't be resolved yet.
See also: most efficient in Honolulu · biggest emitters
How does Iwilei Business Center AOAO compare with other other buildings in Honolulu?
The latest disclosures cover 13 other buildings in Honolulu, out of 799 buildings citywide. Its site EUI of 29.4 kBtu/ft² is about 57% below the average of 68.8 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 224,380 sq ft, it is about twice the average floor area of 106,317 sq ft for those buildings. It was built in 1919, 58 years earlier than the group's average year built (1977). Across all 24 jurisdictions BuildingCensus covers, the 1,327 other buildings average an ENERGY STAR score of 60 and a site EUI of 63.3 kBtu/ft².
How has Iwilei Business Center AOAO's energy performance changed over time?
BuildingCensus holds 3 Honolulu disclosures for Iwilei Business Center AOAO, covering report years 2023–2025. Site EUI moved from 26.9 kBtu/ft² (2023) to 29.4 kBtu/ft² (2025), an 9% increase. Reported emissions went from 1,258 tCO₂e to 1,380 tCO₂e over the same span (up 10%).
What does a site EUI of 29.4 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. Iwilei Business Center AOAO's 29.4 kBtu/ft² across 224,380 sq ft works out to about 6.6 billion Btu (1,933 MWh-equivalent) in 2025. The disclosure also reports 1,911,395 kWh of electricity, 774 therms of natural gas and 3,453 thousand gallons of water for the year.
Which law requires Iwilei Business Center AOAO to report its energy use?
Iwilei Business Center AOAO reports under Ordinance 22-17 (City & County of Honolulu), the legal basis of Honolulu's Better Buildings Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2025 disclosure (source record honolulu:04QFJ1730057651:2025). Honolulu's Ordinance 22-17 requires commercial buildings over 25,000 sq ft on Oʻahu to benchmark annually, with public disclosure of results.
More other buildings in Honolulu
- 909 Dillingham· 122,987 sq ft · EUI 22.9 kBtu/ft²
- The Odom Corporation· 88,074 sq ft · EUI 55.3 kBtu/ft²
- Waipahu Shopping Plaza· 80,095 sq ft · EUI 159.3 kBtu/ft²
- DHX - Dependable Hawaiian Express· 76,783 sq ft · EUI 3.5 kBtu/ft²
- Harbor Center· 66,300 sq ft · EUI 57.2 kBtu/ft²
- 1500 Kapiolani· 65,000 sq ft · EUI 41.5 kBtu/ft²
- All Honolulu benchmarked buildings· Ordinance 22-17 (City & County of Honolulu)
- Most efficient large buildings in Honolulu
- Least efficient large buildings in Honolulu
- Biggest emitters in Honolulu
Frequently asked questions
What is Iwilei Business Center AOAO's energy grade?
Iwilei Business Center AOAO did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 29.4 kBtu/ft².
How much energy does Iwilei Business Center AOAO use?
Its 2025 site energy-use intensity was 29.4 kBtu/ft² across 224,380 sq ft, including 1,911,395 kWh of electricity and 774 therms of natural gas.
What are Iwilei Business Center AOAO's carbon emissions?
Iwilei Business Center AOAO reported 1,380 tCO₂e of greenhouse-gas emissions for 2025.
Where is Iwilei Business Center AOAO?
Iwilei Business Center AOAO is at 501 Sumner St, Honolulu, in Honolulu, Hawaii.
How big is Iwilei Business Center AOAO and when was it built?
Iwilei Business Center AOAO has 224,380 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1919 as its year built. It is classed as other.
Is Iwilei Business Center AOAO covered by Ordinance 22-17 (City & County of Honolulu)?
Yes — it appears in the 2025 Better Buildings Benchmarking disclosure, which lists the buildings reporting under Ordinance 22-17 (City & County of Honolulu).
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About this data
Source: Better Buildings Benchmarking (Ordinance 22-17 (City & County of Honolulu)), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Iwilei Business Center AOAO, Honolulu, Hawaii — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/honolulu/iwilei-business-center-aoao-634b3511 (data as of July 9, 2026).