A building, structure, or activity that is conforming to use but situated on a lot in a manner that does not comply to applicable bulk requirements, including but not limited to lot area, yard dimensions, building height, development coverage, off-street parking, loading, or other bulk requirements set forth in this Zoning Chapter shall be deemed to possess noncomplying bulk. Routine normal maintenance, repairs, and alterations that decrease or diminish said noncompliance are permitted. No permit shall be issued that will increase the nonconformity of any bulk requirements without an area variance from the Zoning Board of Appeals.