By mailing ten (10) days prior to said hearing, postage prepaid, to the owners and tenants of property within a radius of three hundred (300) feet of the exterior boundaries of the property involved in the application, using for this purpose the last known name and address of such owners as shown upon the current tax assessors records. Notice is deemed received two (2) days after date of postmark. The notice shall state the nature of the request, location of the property (text or diagram), the date, time, and place of the scheduled hearing, and the hearing body;