The scope of works for the redevelopment of the Melbourne GPO as a major retail precinct comprised refurbishment of the existing heritage building and the construction of a six level building to the north of the site.

The refurbishment included the reinstatement of the heritage-listed Postal Hall, which was extensively damaged by fire. The work involved reconstruction of the original four storey postal atrium and the ornate ceilings. The facades of the nineteenth century building have also been preserved.

The new building includes restaurants, retail and commercial tenancies. While structurally separate from the GPO it is integrated with the heritage building and has been constructed entirely from precast components and features extensive glazing on its façade. St Hilliers installed all mechanical and electrical services for the redevelopment.