Prior to the construction of any building or structure in the PD zone, a final project plan shall be submitted and approved that meets the requirements of Section 15.03.310, Provo City Code. Said plan may be submitted in units or phases, provided each such phase can exist as a separate entity capable of independently meeting all of the requirements and standards of this Chapter and of the underlying zone with which the PD zone has been combined. The separate development of said phases shall not be detrimental to the performance development nor to the adjacent properties in the event that the remainder of the project is not completed.