How do you track down address of a business owner?

[Mubasher Riaz]

Im interested in purchasing a specific franchise however it's too expensive to open one, instead it's cheaper if you buy it off an existing franchisee. I was able to look up the property information on my county assessor website, however it does not provide the business owners home address anywhere. What is a good method of tracking them down so I can send them some yellow letters? thanks!