Exception for the establishment of a use, structure, or building not requiring authorization. If prior to the adoption of this chapter, or amendment thereto, a lawful land use, structure, or building is actively being established that did not require a permit or other approval under the zoning regulations in effect at that time, said work may continue to completion even when such land use, structure, or building 1) now requires a permit or other authorization under this chapter; 2) is being developed contrary to this chapter; or 3) is otherwise prohibited under this chapter. If such work is not completed within six months of the establishment of this chapter, any work must thereafter conform to the requirements herein, unless extended by action of the Village Board.