Any structure erected, moved, altered enlarged or maintained or any use of a site contrary to the provisions of this Title is unlawful and a public nuisance, and the City Attorney may institute necessary legal proceedings for the abatement, removal and enjoinment thereof in the manner provided by law and may take such other steps as may be necessary to accomplish these ends, and may apply to a court of competent jurisdiction to grant such relief as will remove or abate the structure or use and restrain or enjoin the person, firm, corporation or organization from erecting, moving, altering or enlarging the structure or the site contrary to the provisions of this Title; provided, however, that such action by the City Attorney is authorized under Chapter 1.13 of the this Code.