Once the Board of Adjustment has heard all the evidence presented upon an application or appeal as provided in this chapter, and denies the same, the Board shall refuse to hold further hearings on the substantially similar application or appeal by the same applicant, successor, or assignee for a period of six months.

If the Board of Adjustment determines from the information supplied with a request for a rehearing that changed conditions have occurred relating to the promotion of the public health, safety, convenience, comfort, prosperity, and general welfare, the appeal or application may be considered within the six-month period.