Riparian Plaza is a 53-storey skyscraper located in the central business district of Brisbane, Queensland, Australia. The building stands at 250 m (820 ft) in height to its communications spire and 200 m (660 ft) to its roof. It is the city's tallest building, or second tallest if measured to roof after the Aurora Tower, not considering the currently under construction Soleil and Infinity Tower. It is a mixed use building, with 11 car park levels from the ground up, 25 commercial levels, and 12 residential levels originally housing 50 penthouse apartments.
On top of the tower is a 50 m (160 ft) communications spire. A recreation centre including a swimming pool is located on 39th floor, between the commercial and residential sections. The carpark is accessed via a helical annexe. The tower has an open plaza and promenade space totaling 3,500 m2 (38,000 sq ft). The upper plaza level contains the Siana Bar dining lounge.