Any phase or plat of a planned development within a PD Zone which locates residential uses next to non-residential uses, shall provide a buffer between the residential and the non-residential uses so as to minimize the impact of such uses on one another within the PD Zone and to reduce the impact of the PD Zone on existing uses on adjoining properties. At the discretion of the City, specific requirements to minimize the impact of the PD Zone on existing uses may be imposed in the development agreement approved in conjunction with the related PD Zone.