A site plan showing the location of each structure and the minimum distance between structures, and between structures and the property line, street line, and/or alley line shall be submitted. For structures more than one (1) story in height, except single-family and two-family residences, elevations and/or perspective drawings shall be required in order that the relationship for the structures to adjacent property, open spaces, and to other features of the development plan may be determined. Such drawings shall indicate the height, number of floors, and exposures for access, light, and air.