The Commissioners or the hearing officer, as the case may be, shall render a written decision or, when no decision is called for, make written findings on the conditional use application within 45 days after the last hearing. The date for the decision may be extended by the applicant either on the record or in writing addressed to the Commissioners or hearing officer. Where the application is contested or denied, each decision shall be accompanied by findings of fact or conclusions based thereon, together with any reasons therefor. Conclusions based on this chapter, the Pennsylvania Municipalities Planning Code, or any rule or regulation shall contain a reference to the provision relied on and the reasons why the conclusion is deemed appropriate in the light of the facts found. A copy of the decision or, where no decision is called for, of the findings shall be delivered to the applicant personally or mailed to him no later than the day following its date. If, after the conclusion of the public hearing(s), the application is amended or revised, the Commissioners or hearing officer, as the case may be, shall hold one or more public hearings thereon as may be necessary and shall issue a new decision thereon in conformance with the procedure established in this section.