The building at 140 William Street
In 1991, the existing building was a large freestanding building located centrally in the City of Melbourne. It had 41 levels, of which 37 could be occupied, and was used as an office building. See Figure 17.1 for an elevation of the building. All the columns and the bracing members were heavily encased in concrete and in the case of the external columns were further encapsulated with steel plate. The floors were supported on long-span castellated steel beams framing between primary beams and the perimeter of the building. A typical floor framing plan is shown in Figure 17.2. The floor slabs were of composite construction using lightweight concrete and steel decking. The soffit of the floor slabs and steel supporting beams were sprayed with asbestos-based fire protection material.