The Twenty One Hundred
Multifamily Housing in Honolulu, HI · 2100 Date St, Honolulu
At a glance
The Twenty One Hundred is a 105,696-square-foot multifamily housing building at 2100 Date St, Honolulu in Honolulu, Hawaii, built in 1980. In its 2025 Honolulu benchmarking disclosure it reported a site energy-use intensity of 19.7 kBtu/ft² and 440 tCO₂e of greenhouse-gas emissions.
Ordinance 22-17 (City & County of Honolulu) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 19.7 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 440 tCO₂e |
| GHG intensity | — |
| Electricity | 611,600 kWh |
| Water use | 6,495 kgal |
| Gross floor area | 105,696 sq ft |
| Source record | honolulu:04QFJ2138954884:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 19.7 kBtu/ft² | 440 tCO₂e | |
| 2024 | 100 | ±0 | 21.0 kBtu/ft² | 468 tCO₂e |
| 2023 | 100 | 21.2 kBtu/ft² | 473 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
- 2100 Date 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 The Twenty One Hundred compare with other multifamily housing buildings in Honolulu?
The latest disclosures cover 378 multifamily housing buildings in Honolulu, out of 799 buildings citywide. Its site EUI of 19.7 kBtu/ft² is about 30% below the average of 28.2 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 105,696 sq ft, it is about 34% below the average floor area of 159,294 sq ft for those buildings. Its 1980 construction date is close to the group's average year built (1979). 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 Twenty One Hundred's energy performance changed over time?
BuildingCensus holds 3 Honolulu disclosures for The Twenty One Hundred, covering report years 2023–2025. Its ENERGY STAR score was 100 in both 2023 and 2024. Site EUI moved from 21.2 kBtu/ft² (2023) to 19.7 kBtu/ft² (2025), a 7% decrease. Reported emissions went from 473 tCO₂e to 440 tCO₂e over the same span (down 7%).
What does a site EUI of 19.7 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. The Twenty One Hundred's 19.7 kBtu/ft² across 105,696 sq ft works out to about 2.1 billion Btu (610 MWh-equivalent) in 2025. The disclosure also reports 611,600 kWh of electricity and 6,495 thousand gallons of water for the year.
Which law requires The Twenty One Hundred to report its energy use?
The Twenty One Hundred 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:04QFJ2138954884:2025). Honolulu's Ordinance 22-17 requires commercial buildings over 25,000 sq ft on Oʻahu to benchmark annually, with public disclosure of results.
More multifamily housing buildings in Honolulu
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- Waikiki Lanais· 104,551 sq ft · EUI 32.8 kBtu/ft²
- Kapuna1 Apartments· 104,547 sq ft · EUI 18.4 kBtu/ft²
- Highlander· 102,850 sq ft · EUI 39.0 kBtu/ft²
- Royal Aloha· 101,019 sq ft · EUI 60.9 kBtu/ft²
- Inn on the Park· 100,762 sq ft · EUI 33.4 kBtu/ft²
- Multifamily Housing buildings in Honolulu· 378 benchmarked
- All Honolulu benchmarked buildings· Ordinance 22-17 (City & County of Honolulu)
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Frequently asked questions
What is The Twenty One Hundred's energy grade?
The Twenty One Hundred did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 19.7 kBtu/ft².
How much energy does The Twenty One Hundred use?
Its 2025 site energy-use intensity was 19.7 kBtu/ft² across 105,696 sq ft, including 611,600 kWh of electricity.
What are The Twenty One Hundred's carbon emissions?
The Twenty One Hundred reported 440 tCO₂e of greenhouse-gas emissions for 2025.
Where is The Twenty One Hundred?
The Twenty One Hundred is at 2100 Date St, Honolulu, in Honolulu, Hawaii.
How big is The Twenty One Hundred and when was it built?
The Twenty One Hundred has 105,696 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1980 as its year built. It is classed as multifamily housing.
Is The Twenty One Hundred 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, “The Twenty One Hundred, Honolulu, Hawaii — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/honolulu/the-twenty-one-hundred-72466ba5 (data as of July 9, 2026).