P&O Building (Perth)The former P&O Building is a heritage-listed building in Perth, Western Australia.Site historyThe site of the building formerly housed three separate shops at 56, 58 and 60 William Street. It was built to house the Orient Steam Navigation Company, one of the two major passenger and cruise liner companies serving Australia between late 1800s and 1970s. It was officially opened by William Campion, the Governor of Western Australia, on 16 September 1930.ArchitectureIt is a seven-storey steel framed office building, clad in Donnybrook stone and rendered brick. It was designed in the Inter-war Functionalist style by Waldie Forbes of the Hobbs Smith & Forbes architecture firm, at a cost of £A41,073, equivalent to in.