Southern Cross Tower, also known as 121 Exhibition Street, is a 161-metre (530 ft) skyscraper in Melbourne, Victoria, Australia. The tower was built in 2004 and comprises 39 levels of office accommodation. The complex is a twin tower. The SX1 delivers 76,700 square meters of space over 39 floors. The SX2 provides 45,200 square metres and 22 levels. The tower was once the location of Melbourne's prestigious Southern Cross Hotel.