Upon the conclusion of the hearing the board shall determine whether the property or any part thereof, as maintained, constitutes a public nuisance. If the board so finds, the board shall adopt a resolution declaring such property to be a public nuisance, setting forth its findings and ordering the abatement of the same by having such property rehabilitated, repaired, or demolished and removed in the manner and means specifically set forth in said resolution. The resolution shall set forth the time within which such work shall be completed by the owner, in no event less than thirty calendar (30) days. The decision and order of the board shall be final. (Ord. 99-49 § 1 (part): prior gen. code § 3-303.6)