Alan Potamkin is the owner of Potamkin Auto Gallery which sells high end cars as well as Potamkin Auto Mall which sells Chevrolet, Jeep, Chrysler, Kia, and Mitsubishi.
In 2010, there were unsubstantiated rumors that LeBron James had purchased this house. As of March 2014, the home is still owned by Potamkin.
http://thesportsmole.wordpress.com/2010/07/18/what-does-50-million-dollars-get-you-on-todays-real-estate-market-ask-lebron-james/
http://therealdeal.com/miami/blog/2015/05/14/alan-potamkin-lists-coral-gables-estate-for-67m/