Ala. Code § 45-37A-251.51
Whenever the appropriate city official of the city shall find that any building, structure, part of building or structure, party wall, foundation, abandoned or unused swimming pools, or abandoned wells or cisterns situated in the city is unsafe to the extent that it is a public nuisance, the official shall report the findings to the city governing body. At that time the city governing body shall determine whether a nuisance exists. Should the city governing body find by resolution that a nuisance exists, then the appropriate city official shall give the person or persons, firm, association, or corporation last assessing the property for state taxes, by certified or registered mail to the address on file in the office of tax collector, notice to remedy the unsafe condition within a reasonable time set out in the notice, which time shall not be less than 30 days unless an extension is granted by the appropriate city official or the nuisance shall be abated by the city and the cost assessed against the property. The mailing of the certified or registered notice, properly addressed and postage prepaid, shall constitute notice as required in this subpart. The city shall place a sign or placard within 15 feet of the entrance of the property wherein the public nuisance is located, indicating that the city had declared the building or structure to be a public nuisance or that a public nuisance exists on the property. If there is no entrance in which to place the sign or placard, then the sign or placard may be posted at any location visible to the general public.
Ala. Code § 45-37A-251.51 (1975)