Data-driven optimisation at 1 William Street, Brisbane

NOVEMBER 2025

A smart building optimisation program has helped Brisbane’s largest office tower – the 75,000 square metres, 40-storey 1 William Street – outperform its original design.

A smart building optimisation program has helped Brisbane’s largest office tower – the 75,000 square metres, 40-storey 1 William Street – outperform its original design.

Delivered in 2016 and home to the Queensland State Government, the building was designed for a 5 star NABERS Energy rating.
But close collaboration, an innovative mindset and smart building technology helped Cbus Property and co-owner ISPT push the building beyond expectations – achieving a 6 star NABERS Energy rating in 2024.

Working with A.G. Coombs Advisory, A.E. Smith and JLL, Cbus Property and ISPT developed a decarbonisation roadmap with building system tuning and a robust analytics and visualisation platform to capture and analyse data, and extract actionable insights to improve energy performance.
Strategies were also developed to address challenges such as record Brisbane humidity and increased after-hours demand during the 2023 Queensland election year.

1 William Street is now a flagship example of how data-driven optimisation can elevate workplaces to the highest standards of sustainability.

• 646,035 kWh of energy saved over 12 months
• Equates to a 14.75 per cent reduction in annual energy use