A key feature of this unique building is the intricate heritage-inspired, street-level brick arches from ground level to Level 9, seamlessly transitioning to a glass and steel tower. Curved steel fins rise from the building’s rooftop, forming an architectural structural-steel roof feature that is an iconic and recognisable addition to the Sydney skyline. The roof of each of the two towers are formed by a series of 23 arched steel fabricated sections that increase in length towards the centre, cantilever and curve over roof lounge areas. They are joined together with high-grade stainless-steel tension bracing rods shaping the skyline with a gentle and organic form to create two very large vaulted rooftop spaces.  Precision-engineered detailed shop drawings were produced and the steel arches were fabricated in South Australia, delivered to site prefinished with a high-grade paint finish and craned and stored on the building at roof level.  The fixing of each steel arch required precision set-out and erection procedures (not damaging the paint finish); skating each steel arch across the roof slab with expert riggers, padded slings, temporary bracing and connecting to the final base plate location; surveyed for verticality and locked into final position with less than one millimetre of tolerance.
The finished two steel rooftop structures represent the highest quality of teamwork, engineering professionalism, steel work fabrication and installation skills in bringing the architect’s design to realisation.