An integrated planned commercial development, which is a grouping of three or more commercial establishments which have common vehicular parking facilities, controlled access to abutting streets, and are developed under a unified site plan, shall be permitted provided that the following conditions are met:
(a) Only those types of business uses permitted for conventional development in the district shall be permitted in integrated planned business developments.
(b) The minimum site size to be considered for an integrated planned shopping development shall be two (2) acres.
(c) Side yards and rear yards shall be required only on the perimeter of the planned development and shall be thirty (30) feet except that where the business development is adjacent to a residential zone the side and/or rear yard shall be fifty (50) feet on the side(s) abutting the residential zone only.