The structural systems have evolved from mud and wooden skin cover huts to modern buildings and skyscrapers defying gravity. These new constructive systems have been possible by develop and materials with high resistance and versatility. However, regardless of era, the structural systems keep two main components: substructure (foundations) and superstructure (beams and columns). The Flat Iron building in New York and explain its structural system using course concepts such as materials, foundations, soil resistance, beams, frames, structural behavior, and aesthetics, among others. The paper should at least three scholarly references. The research paper can be enhanced with visuals.