Ala. Code § 11-48-103

In all cases where assessments may be split or divided as authorized in this article, notice to owners of the property covered by such assessments or to their agents shall be given, either in person or by mail, where such owners or agents and their addresses are known or by publication in a newspaper published in the municipality once a week for two consecutive weeks, where such owners or agents and their addresses are unknown, before any final action shall be taken as provided in this article.