It shall be the duty of the designated authority to proceed at once upon the expiration of the time specified in the notice to cause such nuisance to be abated; provided, however, that, whenever the owner, occupant, agent or person in possession or control of any premises in or upon which any nuisance may be found is unknown or cannot be found, the designated authority shall proceed to abate such nuisance without notice. In either case, the expense of such abatement shall be collected from the person who may have created or suffered such nuisance to exist, in addition to any penalty or fine.
(Prior Code, § 12-104)