Quay Quarter Tower (QQT) is a pioneering redevelopment which redefines what is possible for tall buildings nearing the end of their commercial life. The radical sustainability strategy involved upcycling the existing 1976 AMP Centre, retaining 65% of its beams, columns, and slabs, and over 98% of its existing core, resulting in an embodied carbon saving of over 12,000 metric tons in concrete alone. The design adds approximately 45,000 square-metres of new construction, doubling the floor area and creating a new world-class high-rise office from an outdated, underperforming building.