Purpose. The zoning permit looks to the location and use of the building in light of the requirements of this chapter, and certifies that such location and use is permitted, or that it exists as a nonconforming use and/or nonconforming structure, or is permitted by the terms of a variance. To ensure compliance with the provision of this chapter, no person shall erect, alter or convert any structure or building or part thereof or alter the use of any land subsequent to the adoption of this chapter, until a zoning permit has been issued by the Zoning Officer.