Dome

Lobby, view of the central dome; It has 32 floors and, at 454 feet (138 m) high, is the tallest base-isolated structure in the world, having undergone a seismic retrofit that will allow the building to sustain minimal damage and remain functional after a magnitude 8.2 earthquake (structural engineering performed by Nabih Youssef.) City Hall's distinctive tower was based on the purported shape of the Mausoleum of Maussollos. Source: Wikipedia; http://en.wikipedia.org/wiki/Main_Page (accessed 7/14/2010)