the enforcement authority may send notice under section 25 of this chapter to each person who held a known or recorded fee interest, life estate interest, or equitable interest of a contract purchaser in the unsafe premises. If the notice is sent, the enforcement authority shall also send notice to any mortgagee with a known or recorded substantial property interest. The notice must require full payment of the amount owed within thirty (30) days.
IC 36-7-9-13.5