Ala. Code § 11-54B-6
At least twenty (20) days prior to the date set for a public hearing on the proposed self-help business improvement district plan, notice of the date, time and place of the hearing, with a description of the geographical area proposed to be included in the district, the proposed ordinance, and the self-help business improvement district plan shall be mailed to all known owners of real property located within the geographical area proposed to be included in the district. Such notice shall be mailed to all known owners of such real property at the address listed in the county property tax assessment records. In addition, a copy of such notice shall be posted in at least three (3) places located within the geographical area proposed to be included in the district. A property owner's failure to receive a copy of such notice shall not constitute grounds upon which such owner may contest the validity of a self-help business improvement district ordinance.
Ala. Code § 11-54B-6 (1975)