Any person operating, conducting or carrying on any business which requires a license by this Chapter shall obtain an individual license for each business being conducted. The grant of a license for one trade, profession, business or privilege requiring a license shall not relieve the person from the necessity of securing individual licenses or permits for each such business. In the event the business is a rental building containing more than one dwelling unit, only one license is required for each individual rental building, although multiple dwelling units occupied by multiple tenants may be contained within the individual building.