Whenever the amount of any administrative penalty and/or administrative cost imposed by the Administrative Hearing Officer pursuant to this Article in connection with real property has not been satisfied in full within ninety days and/or has not been successfully challenged by a timely writ of mandate, this obligation may constitute a lien or, in the alternative, a special assessment against the real property on which the violation occurred. (Ord. No. 2423 (NCS), § 1.)