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Exterior Constructed of stainless steel, the tower is memorable for the noticeable twist in its outer façade on a ferroconcrete core, making optimal use of the relatively small piece of ground on which it is located[citation needed]. Like many of Gehry's buildings, the tower was created with the most modern technology available at the time.  Photo 2 of 14 in 13 Iconic Buildings Designed by Frank Gehry