    30 st mary axe (widely known informally as the gherkin and previously as the swiss re building) is a commercial skyscraper in london's primary financial district, the city of london. it was completed in december 2003 and opened in april 2004. with 41 storeys, it is  tall and stands on the former site of the baltic exchange, which was extensively damaged in 1992 by the explosion of a bomb placed by the provisional ira in st mary axe, the street from which the tower takes its name. after plans to build the 92-storey millennium tower were dropped, 30 st mary axe was designed by norman foster and arup group and it was erected by skanska, with construction commencing in 2001.{{cite w
Buildings_and_structures_known_by_their_street_address High-tech_architecture Lattice_shell_structures Norman_Foster_buildings Office_buildings_completed_in_2003 Ove_Arup_buildings_and_structures Skyscrapers_between_150_and_199_meters Skyscrapers_in_the_City_of_London