prove that the use is legal nonconforming, but will only state that if the use is legal nonconforming, it may be rebuilt. What is a Legal Nonconforming Use? A “legal nonconforming use is a use of land or structure which was legally established according to the applicable zoning and building laws of the time, but which does not meet current zoning and building regulations. A use or structure can become “legal nonconforming” due to rezoning,