Unsanitary

"A. The exterior of the premises and all structures thereon shall be kept free of all nuisances, unsanitary conditions and fire or safety hazards in the public areas and any of the foregoing shall be removed and abated promptly by the owner or manager. B. Without limiting the generality of Subsection A, the maintenance includes: . . . (3) Keeping the premises free of conditions conducive to infestation by vermin or insects, such as rodent harborages or stagnant water, and other known sources of infestation."