The owner of every dwelling, dwelling unit, rooming unit, hotel or motel which is declared unfit for human habitation or for continued occupancy shall make the dwelling unit, rooming unit, dwelling, hotel or motel, safe and secure under the terms so that it shall not be dangerous to human life and shall not constitute a fire hazard or public nuisance. Any such vacant dwelling, dwelling unit, rooming unit, hotel or motel, open at doors or windows, if unguarded, shall be deemed to be dangerous to human life as a fire hazard and as a public nuisance with the meaning of this provision. (1997 Code)