The hearings shall be conducted by the Board or the Board may appoint any member as a hearing officer. The decision, or, where no decision is called for, the findings shall be made by the Board; however, the appellant or the applicant, as the case may be, in addition to the municipality, may, prior to the decision of the hearing, waive decisions or findings by the Board and accept the decision or findings of the hearing officer as final. The Board shall render a written decision or written findings on the application within 45 days after the last hearing or, if such hearing is continued, within 45 days after said continued hearing. If the Board does not make a decision within 45 days after the hearing or continued hearing, it shall be deemed that such Board has decided in favor of the person or Borough official aggrieved or affected who is seeking relief, unless the applicant has agreed in writing or on the record to an extension of time.