Notwithstanding any other provision of this Code, whenever, in the reasonable judgment of the Enforcement Officer, the existence or continuance of any violation of this Code; or any public nuisance, or any other condition which poses an imminent or immediate danger of significant harm to persons or property, or so endangers the public health, welfare or safety, an Enforcement Officer may act immediately and without prior notice or hearing to abate such condition. The expense or cost resulting from such summary abatement shall be enforceable as a personal obligation of the responsible party. The expense or cost of summary abatement may be imposed as a lien or a special assessment on real property, as described in Section 1-12-600.