100 St Georges Terrace is a 24-storey skyscraper located at 100 St Georges Terrace in Perth, Western Australia.It is a mixed retail and commercial property. The retail component, named enex perth (Formerly enex100), is made up of three floors of shops and food outlets between St Georges Terrace and the Hay Street Mall. The office tower is 103m high and the project was the first office building constructed in Perth to a 4.5-star Australian Building Greenhouse Rating.Site historyThe St Georges Terrace side of the site was formerly occupied by several buildings. The site adjacent to Trinity Church was opened as a branch of the Union Bank in 1885. The seven-storey New Zealand Insurance Company building was constructed at 100 St Georges Terrace in 1927, followed by the neighbouring six-storey Airways House in 1933. The Union Bank became ANZ Bank, and in May 1963 it vacated its building to allow for the construction of a modern replacement building on the same site. The replacement ANZ Bank was 14-storeys tall and was opened in November 1965 by Premier David Brand. The site also became home to the National Mutual Arcade.The Hay Street side of the site was home to department store Sandovers. The original building on the site designed by architect J. Talbot Hobbs was destroyed by fire in 1907 and replaced with a new building. This remained the home of Sandovers until the company closed down late in the 20th century, and the facade remains standing to this day.