Rialto Towers

The Rialto Towers (often The Rialto) is a skyscraper located at 525 Collins Street, in the western side of the central business district of Melbourne, Australia. It is the second-tallest reinforced concrete building and the tallest office building in the Southern Hemisphere, when measured to its roof (several other skyscrapers in Australia are taller if their spires are included, as are some other structures in Australia such as communications masts and observation towers).

The Rialto Towers featured Melbourne's first skyscraper public Observation Deck which operated between 1994 and 31 December 2009. It was also the location of Melbourne's first Tower running event.