B1-100 Purpose and intent. The B-1 district is composed of certain lands and structures in the county used primarily to provide for the retailing of goods and the furnishing of selected services to surrounding neighborhoods. Regulations within this district are intended to permit and encourage full development of necessary commercial use and at the same time protect nearby residential properties from possible adverse effectsof such commercial activity. Any building or premises used for any of thepermitted uses shall have not more than 40 percent of the total floor area ofthe building or premises devoted to storage or industry purposes incidental to the primary use.