These two multi-storey residential high-rise apartments, adjacent to the railway corridor at Chatswood, were built in two stages: the tower was designed and constructed using off-form in situ reinforced concrete, while the second introduced precast load bearing concrete to improve the quality of the exterior finishes and the speed of construction, as well as post-tensioned flat plate floor construction to achieve concrete pour cycles of 3 to 4 days. MPN Group provided full reinforcement and post-tensioned design, documentation and site inspection services.