Except as otherwise provided in the case of nonconforming uses, no building or land shall hereafter be used or occupied and no building or part thereof shall be erected, moved or altered unless in conformance with the regulations herein specified for the district in which it is located.

No land located in a business district shall be used for commercial purposes unless said business is operated from a building and said building conforms to all applicable zoning regulations for the district in which it is located.