The corporate authorities may demolish, repair or cause the demolition or repair of dangerous and unsafe buildings or structures or uncompleted and abandoned buildings or structures within the corporate limits of the city in accordance with, pursuant to, and as is required by Chapter 15.20 of the city’ s municipal code and/or Section 11-31-1 et seq. of the Illinois Municipal Code (65 ILCS/11-31-1, et seq.-Unsafe Building Act). (Ord. 1686 § 1 (part), 1998)