Flatiron Building. Between 22nd St. and 23rd St. between Broadway and 5th Ave and Fuller also Called building , its founder , was finished building in 1902 and was one of the first skyscrapers incorporating a steel structure which will allowed to reach 87 meters high. The facade of limestone and terracotta forms a triangle that only two meters wide at the 23rd St. and resembles the prow of a ship . Art Nouveau was designed by Daniel Burnham for a triangular lot located at the intersection of 23r