The Town Board shall thereafter consider said report, and if it finds from said report that there is grounds to believe that such buildings are dangerous or unsafe to the public, the Town Board, by resolution, shall order its removal or repair, if the same can be safely repaired, and further order that a notice be served personally or by registered mail upon the owner or representatives, agents, lessees or any other person having a vested or contingent interest in the premises, as shown by the last preceding assessment roll of the Town and/or by the records of the County Clerk's office. If such service is made by registered mail, a copy of the notice must be posted on the premises.