At a glance
Century Square is a 177,289-square-foot office building at 1188 Bishop St, Honolulu in Honolulu, Hawaii, built in 1981. In its 2025 Honolulu benchmarking disclosure it reported a site energy-use intensity of 47.9 kBtu/ft² and 1,591 tCO₂e of greenhouse-gas emissions.
Ordinance 22-17 (City & County of Honolulu) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 47.9 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 1,591 tCO₂e |
| GHG intensity | — |
| Electricity | 2,285,718 kWh |
| Natural gas | 7,014 therms |
| Water use | 7,115 kgal |
| Gross floor area | 177,289 sq ft |
| Source record | honolulu:04QFJ1834556959:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 47.9 kBtu/ft² | 1,591 tCO₂e | |
| 2024 | 84 | -7 | 49.7 kBtu/ft² | 1,741 tCO₂e |
| 2023 | 91 | 49.4 kBtu/ft² | 1,786 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
- 1188 Bishop 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 Century Square compare with other office buildings in Honolulu?
The latest disclosures cover 64 office buildings in Honolulu, out of 799 buildings citywide. Its site EUI of 47.9 kBtu/ft² is roughly in line with the average of 48.1 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 177,289 sq ft, it is roughly in line with the average floor area of 183,069 sq ft for those buildings. It was built in 1981, 5 years later than the group's average year built (1977). 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 Century Square's energy performance changed over time?
BuildingCensus holds 3 Honolulu disclosures for Century Square, covering report years 2023–2025. Its ENERGY STAR score went from 91 in 2023 to 84 in 2024 (-7 points); its best year on file was 2023, at 91. Site EUI moved from 49.4 kBtu/ft² (2023) to 47.9 kBtu/ft² (2025), a 3% decrease. Reported emissions went from 1,786 tCO₂e to 1,591 tCO₂e over the same span (down 11%).
What does a site EUI of 47.9 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. Century Square's 47.9 kBtu/ft² across 177,289 sq ft works out to about 8.5 billion Btu (2,489 MWh-equivalent) in 2025. The disclosure also reports 2,285,718 kWh of electricity, 7,014 therms of natural gas and 7,115 thousand gallons of water for the year.
Which law requires Century Square to report its energy use?
Century Square 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:04QFJ1834556959:2025). Honolulu's Ordinance 22-17 requires commercial buildings over 25,000 sq ft on Oʻahu to benchmark annually, with public disclosure of results.
More office buildings in Honolulu
- Waikiki Business Plaza· 176,000 sq ft · EUI 60.1 kBtu/ft²
- Bank Of Hawaii Waikiki Center· 165,191 sq ft · EUI 63.4 kBtu/ft²
- Hawaii News Now· 162,253 sq ft · EUI 67.2 kBtu/ft²
- Waikiki Galleria Tower· 161,017 sq ft · EUI 43.3 kBtu/ft²
- Cades Schutte Building· 154,093 sq ft · EUI 60.5 kBtu/ft²
- 615 Piikoi Building· 153,198 sq ft · EUI 57.1 kBtu/ft²
- Office buildings in Honolulu· 64 benchmarked
- 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 Century Square's energy grade?
Century Square did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 47.9 kBtu/ft².
How much energy does Century Square use?
Its 2025 site energy-use intensity was 47.9 kBtu/ft² across 177,289 sq ft, including 2,285,718 kWh of electricity and 7,014 therms of natural gas.
What are Century Square's carbon emissions?
Century Square reported 1,591 tCO₂e of greenhouse-gas emissions for 2025.
Where is Century Square?
Century Square is at 1188 Bishop St, Honolulu, in Honolulu, Hawaii.
How big is Century Square and when was it built?
Century Square has 177,289 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1981 as its year built. It is classed as office.
Is Century Square 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, “Century Square, Honolulu, Hawaii — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/honolulu/century-square-c87a4865 (data as of July 9, 2026).