Rehearings. Whenever the Zoning Board of Appeals, after hearing all the evidence presented upon an application for appeals under the provisions of this code, denies or rejects same, said Board shall refuse to hold further hearings on the same or substantially similar application for appeal by the same applicant, their successors or assigns, for a period of one year, except and unless the Board shall find and determine from the information supplied in the request for a rehearing that changed conditions have occurred relating to the promotion of public health, safety, convenience, comfort, prosperity and general welfare and that a reconsideration is justified. Such rehearing may be granted only upon the favorable vote of a majority of the Board plus one.