Once an applicant proves the proposed use satisfies the zoning ordinance’s objective requirements for special exceptions, the burden shifts to objectors to prove the specific use will have greater detrimental effects than those normally expected from the particular use, and that these impacts will pose a substantial threat to the health and safety of the community. Objectors must present more than unsubstantiated concerns or concerns that are merely vague generalities. In addition, doctrine of natural expansion permits a nonconforming use to be expanded in scope as the business increases in magnitude over the ground occupied by the business owner at the time the zoning ordinance was enacted.
Dunbar v. Zoning Hearing Bd., 144 A.3d 219 (Pa. Commw. Ct. 2016)