i'm architecture student from australia... i would like to know How to american skyscrapers of the 1920s differ from those of the 1890s? Why do they differ? Please help me out.......urgent......

• ID# 232.2 (reply to #232.1) - 26 September 2002
  The iron frame of many 1890s buildings made way for the frame with steel members; the style of massively rising block-like towers was replaced by the "set-back" aesthetic of tiered massing, the skyscraper got its own style that evolved fully in the 1930s; the technical improvements in in-building equipment for improved efficiency and comfort, for starters... ED