Maximum building heights shall be governed by a combination of the sky exposure plane (as illustrated in Figure 1 and defined as the theoretical inclined plane connecting a point five feet above grade plane elevation at the top of the curb of the eastern side of Kings Road and traveling westward) and elevation based on the Topographic Map of the Borough of Madison, prepared by VEP Associates, dated April 13, 1993. Buildings shall not project above the sky exposure plane as noted in Figure 1 nor shall they exceed 323.5 feet in elevation, based on the Topographic Map of the Borough of Madison, prepared by VEP Associates, dated April 13, 1993. No building shall contain more than four stories, without incentives.