Actually I think they mean "spatially" as in "in three-dimensions." The Sears Tower would be an example of an "irregularly shaped building," but the John Hancock Building (also in Chicago) is not even though it is non-prismatic.First off, what is a “regular-shaped building”? ASCE defines this as “a building or other structure having no unusual geometrical irregularity in spatial form.” To me, this sounds like any non-rectangular structural is irregular. Is this true?