This Harry Seidler-designed building, opened in 1967, was Sydney's first 'tall office tower' (not to mention the tallest lightweight concrete tower in the world at that time) and brought modern architecture to the heart of Sydney. It also brought artworks, viewable to the public and passers-by, by Le Corbusier, Victor Vasarely and Alexander Calder.
The building was also notable for the fact that it took up just a quarter of the total site, dedicating the rest for public space.