The provisions of this chapter apply to all new construction and significant exterior renovation of existing structures. The provisions of this chapter are subject to the maximum height requirements of applicable Federal, State, and local regulations for runway protection zones and airspace clearances for O'Hare International Airport. Refer to chapter 5, "Nonconformities", of this title for information on the continuation of nonconforming structures. (Ord. 67-2018, 12-18-2018)