Any building or part of a building which by reason of its lack of repair, unsanitary condition, its being infested with rats, vermin, or insects, or which for any reason is unfit for human habitation or constitutes a source of danger to the health and safety of the inhabitants of this city, shall constitute a public nuisance and shall be unlawful as such.
('75 Code, § 42.03) Penalty, see § 96.99