If you are planning to conduct business in the City of Riverside you must obtain a City of Riverside business license, also referred to as a business tax. Looking to buy or sell a business in Riverside or the surrounding area?Let First Choice Business Brokers Riverside guide you through the process! Checklist for Starting a New Business ; Record a Fictitious Business Name Visit the Riverside County Clerk and Recorder's Office website or call 951-486-7000. Business Licenses and Permits. The following links will help ensure businesses are properly licensed, and, if needed, registered with the state. Synergy Business Brokers sells companies in Riverside County. We are an award-winning business broker based in Southern California. Draft and Sign the Purchase Agreement. The most Riverside County, California businesses for sale listings including franchises, opportunities and businesses.