Sometimes one may be faced with the decision to buy over an existing domain, or redo a website on an existing domain of a business you have just bought. This could affect the way you do SEO on your new website.
Consider that this domain might be quite old, and have been home to a variety of suspect or otherwise dodgy websites in the past. As a starting point, do a few searches for any query that is likely to bring up this website on the result pages. See what comes up, and use that in your decision.
If the domain has Google Analytics running, work through its logged history, and look for suspect usage patterns, or dodgy site referrals.
Also check all inlinks and outlinks – many free tools exist for this purpose. Any online gaming, porn or other sites you do not want to be associated with?
– Melius Weideman