The Chifley South Tower formed part of Sydney’s prestigious Chifley Square commercial precinct, long recognised as a premier address for leading business and global enterprise tenants before its transformation into a next-generation development. The Chifley South Tower demolition, located in the heart of Sydney’s CBD, stands as a benchmark project for complex, high-risk urban deconstruction. MANN was engaged by Built to lead demolition within a highly constrained, service-intensive environment. The project required seamless coordination, advanced engineering integration, and a collaborative “can-do” approach to maintain uninterrupted operation of critical commercial infrastructure. The demolition was carried out while the adjoining 43-storey North Tower remained fully operational, with thousands of interconnected services running through the South Tower into a live data environment. These critical systems had to be carefully identified, isolated, and rerouted without disruption, requiring a manual strip-out of approximately 18,000m² due to the inability to perform full shutdowns. The constrained CBD location further limited access, staging, and logistics, while strict noise, vibration, and safety requirements heightened complexity. Mid-project, the retention design evolved from a temporary to a permanent solution, requiring extensive re-coordination across multiple engineering teams. A compressed program with overlapping demolition and construction works, combined with high-risk conditions and ambitious sustainability targets, demanded constant stakeholder coordination and precise execution throughout. MANN led a highly collaborative design and delivery process alongside Built, engineers, and service trades, excavating over 100 exploratory pockets to inform a hybrid retention system that met both temporary and permanent structural requirements without impacting the program. To address the structural interdependency, MANN worked closely with design teams and third-party engineers to safely transfer loads back into the North Tower, enabling independent demolition. A staged manual strip-out of approximately 18,000m² allowed live services to be progressively identified, isolated, and rerouted without disruption, supported by constant real-time coordination between demolition crews and service trades. As works progressed, MANN also enabled overlapping construction activities, maintaining safe shared access and strict controls so the jump form core could be delivered concurrently within the live demolition zone. MANN successfully delivered one of Sydney’s most complex demolition projects safely, efficiently, and without disruption to ongoing building operations. The project was completed under a compressed program, with multiple overlapping works managed seamlessly through strong collaboration and technical leadership. The success of Chifley South Tower was defined not by a single innovation, but by MANN’s ability to lead, coordinate, and unify diverse stakeholders under pressure—delivering a safe, incident-free outcome while maintaining uninterrupted functionality of a major commercial asset. “MANN demonstrated exceptional leadership and technical expertise in delivering the complex Chifley South Tower demolition, seamlessly managing live services and structural challenges within a fully operational environment. Their collaborative approach, commitment to safety, and ability to integrate with broader construction works were instrumental in enabling the successful delivery of this landmark Sydney project.” – Built In the 2025 World Demolition Awards, the project won the Collaboration in Demolition Award. Chifley
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