Where Building Complexes are proposed, a site plan showing the location of each building and the minimum distance between buildings, and between buildings and the property line, street lane and/or alley line shall be submitted. For buildings more than one 1 story in height, except single-family and two-family residences, elevations and/or perspective drawings may be required in order that the relationship of the buildings to adjacent property, open spaces and to other features of the development plan may be determined. Such drawings need only indicate the height, number of floors and exposures for access, light and air.