I was surprised to find out that he is Mexican. His full name is Ilya Juan Salkind Dominguez. I naturally thought that he was Russian.
He probably has a condo in LA. Anyway, they've found him. http://www.nydailynews.com/news/national/2011/02/03/2011-02-03_ilya_salkind_superman_producer_missing_in_mexico_city.html