A rule adopted by the Secretary of State which prohibits any or all types of solicitation directed towards homeowners within a defined geographic area. Such rule may be adopted after a public hearing and upon the Secretary's determination that homeowners within the subject area have been subject to intense and repeated solicitations by real estate brokers or salespersons and that such solicitations have caused owners to reasonably believe that property values may decrease because persons of different race, ethnic, religious or social backgrounds are moving or about to move into such area.