The Portomaso Business Tower is a high-rise office building in Malta. The tower stands in the Portomaso section of St. Julian's, a town just north of Malta's capital city, Valletta. Opened in 2001, the tower is 97.54 metres (320.0 ft) tall, with 23 floors of mixed commercial office space. It became Malta's tallest building upon its completion, and remained so until 2020 when it was surpassed by the Mercury Tower, also in St. Julian's.