Cincinnati Hillside Overlay Districts layer displays hillside areas where the existence of a 20% slope, is combined with the KOPE geologic formation. The Hillside Overlay District states regulations are necessary to establish standards to assist in the development of land and structures in existing hillside areas so that development will be compatible with the natural environment and respect the quality of the urban environment in those locations where the hillsides are of significant public value as determined by the City policy as outlined in the document “A Hillside Protection Strategy for Greater Cincinnati”, 1991.