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Rising 50 storeys (170m), the Harry Seidler designed round tower in Australia Square, was the tallest building in Australia from 1967 to 1976. There's a revolving restaurant on top (of course!) .
Culwalla Chambers, a brick building completed in 1912 at 50 metres in height, remained the tallest office building for many years. Its construction provoked a regulation limiting the height of buildings to 45 metres, a regulation which stayed in force until the 1960s.
Prior to this building, one of the tallest structures in Sydney (other than the Harbour Bridge arch) was the AWA Tower, which looks like a mini Eiffel Tower, and featured here previously.
The tallest building in Australia is now an all- residential tower block on the Gold Coast, called Q1 (323m) and the tallest office tower is 120 Collins St in Melbourne (264m) - midgets compared to Taipei 101, Petronas Towers in Kuala Lumpur and Sears Tower in Chicago.