Whenever, in the judgment of the Village Board, any walls, roofs or any part or parts of a building are deemed to be unsafe or shall have been erected, constructed or repaired contrary to the provisions of these regulations, the Village Board may declare said structure or building a nuisance and direct the Village Clerk to notify the owner or his agent by registered or certified mail, specifying wherein such danger exists, or why such building or structure is unsafe, defective or unlawful. If the owner is unable to be found, the notice provision of this Section may be satisfied by posting said notice on the building. If, after a reasonable period of time, as set by the Village President and Board of Trustees and stated in the notice, the owner, or his agent, neglects to put such building or structure in a safe condition or forthwith to demolish and remove said building or structure or part thereof, he shall be subject to such penalties as prescribed for violations of this Ordinance. Further, if the owner, or his agent, after notice is given or posted as hereinafter provided, shall neglect or refuse to remove such building or structure or part thereof, so that the nuisance shall be abated, the Superintendent of Buildings shall, upon the direction of the President and Board of Trustees, remove and tear down such building or structure, or part thereof, as may be necessary to abate said nuisance. All expenses incurred from such action are hereby declared a lien upon said property and may be recorded from the owner, or his agents. The Village Board may direct that said notice of lien be filed with the Recorder of Deeds or Registrar of Titles of Cook County. The Village may further refuse to issue any permit for said property until the lien is satisfied.