Originally constructed as a commercial office tower, built in 1971, 14-24 College Street was recycled into a premium apartment building. It was “stripped & gutted” a new relocated, centralised lift and stair core, extra floors of penthouses at rooftop (in lieu of “plantrooms with a view”), an indoor 25m lap pool, and more basement car spaces by underpinning the tower footings to install car stackers. Approximately 70% of the original structural concrete was retained, earning the project Green Star points and planning concessions from the City of Sydney.
Major structural aspects of this project included:
Stripping the precast façade and increasing the floor plate area to create new terrace spaces.
Relocation of lift and stair cores from the eastern façade to the centre of the building to improve architectural planning and apartment yields and views.
Underpinning the existing 24 storey tower columns to allow basement excavation for car stacker pits.
Addition of two new floors on top of the existing tower.
Strengthening of existing floor slabs for new loads with carbon fibre strips.
Reconfiguring the split level basement car parking to whole floor parking using a tailored level by level construction sequence.
MPN Group were able to provide an adaptive reuse solution for the existing structure to accelerate delivery and reduce structural costs. MPN worked closely with head contractor Hutchisons to create a works-staging which allowed for vertically simultaneous demolition and construction in key zones of the tower, thereby lopping months off the original planned construction period.