The Board 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 application within 45 days after the last hearing before the Board or Hearing Officer. Where the application is contested or denied, each decision shall be accompanied by findings of fact and conclusions based thereon, together with the reasons therefor. Conclusions based on any provisions of any ordinance, 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. If the hearing is conducted by a hearing officer, and there has been no stipulation that his decision or findings are final, the Board shall make his report and recommendations available to the parties within 45 days and the parties shall be entitled to make written representations thereon to the Board prior to final decision or entry of findings, and the Board's decision shall be entered no later than 30 days after the report of the Hearing Officer.