 riparian plaza is a 53-storey skyscraper located in the central business district of brisbane, queensland, australia. the building stands at  in height to its communications spire and  to its roof. it is the city's tallest building when measured to its pinnacle and fourth tallest when measured to its roof . 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  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 . the upper plaza level contains the siana bar dining lounge. the building was developed by bloomberg incorporation limited with a construction cost of a$130 million. bloomberg retained ownership of the  commercial component and sold off the residential apartments during construction. it is located at 71&nbsp;eagle street, and was the last waterfront vacant block in the brisbane cbd.{{cite web |url=http://www.infolink.com.au/n/major-brisbane-development-project-designe
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