The “Elan” is a 38 storey tall residential building, of some 200 apartments, perched above the William Street road tunnel in Darlinghurst and, more latterly, over the Cross City Link tunnel further below it.  The tower is supported over the twin 14m wide carriage ways of the tunnel using a grillage of deep, reinforced and post tensioned concrete transfer walls and beams. This multi-level grillage allowed the floor space on levels 1 to 5 with as much usable space as possible, with carefully planned doorways and service hatches to create plantrooms and storage spaces.

Construction of the residential tower above the podium proceeded using post-tensioned concrete floor plates supported on  in situ columns and an external load-bearing concrete façade, to allow a very quick construction cycle.

MPN Group provided full structural design, documentation and site-inspection services.