Amends GS 19-1(a) to clarify that the erection, establishment, continuance, maintenance, use, ownership, or leasing of any building or place wherein or whereon repeated acts (was, for the purpose) of an illegal activity, as listed, occur will constitute a nuisance. Makes a conforming change to GS 19-1.2(6) (concerning types of nuisances). Enacts new subdivision (8a) in GS 19-1.1 to define repeated acts as more than one occurrence of assignation, prostitution, gambling, or illegal possession or sale of alcoholic beverages, controlled substances, or obscene matter, as defined, at any building or place during a one-year period. Applies to offenses committed or nuisances occurring on or after August 1, 2011.