The Zoning Board of Appeals shall fix a reasonable time for the hearing, cause notice thereof to be published in the official newspaper not less than seven (7) days prior thereto, cause notice to be given to the appellant or applicant and the administrative officer(s) appealed from by regular mail or by personal service not less than five (5) days prior to the date of hearing. In every case involving a variance, notice shall also be mailed not less than five (5) days prior to the hearing of the fee owners of records of all land within one hundred (100) feet of any part of the subject building or premises involved in the appeal.