The general purpose of regulating nonconforming uses, structures, lots and vessels is to allow for the continued existence of such uses, structures, lots and vessels after a zoning change which would otherwise prohibit such use, structure, lot or vessel, while gradually bringing everything into conformance by regulating how such uses and structures can be reestablished, repaired and restored. Additionally, these regulations allow the nonconforming uses and structures to be physically maintained and encourage their upkeep so as to preserve safety, functionality and appearance within the Town.