Notwithstanding any other provision of this Zoning Code, when an application for a special exception has been filed with the Planning Department, and the subject matter would ultimately constitute a "land development" or a "subdivision" as defined in § 1240.06, no change or amendment of this Zoning Code or the Subdivision Regulations, or other ordinances or plans, shall affect the decision on such application adversely to the applicant. The applicant shall be entitled to a decision in accordance with the provisions of the governing ordinances or plans as they existed at the time the application was filed. Should such an application be approved by the Council, the applicant shall be entitled to proceed with the submission of either land development or subdivision plans within a period of six months, or longer, if specifically approved by the Council, following the date of such approval in accordance with the provisions of the governing ordinances or plans as they stood at the time the application was duly filed before the Council. If either a land development or subdivision plan is so filed within said period, such plan shall be subject to the review procedures and time limitations applicable to land developments or subdivisions under the Penn Hills Subdivision and Land Development Ordinance.