Found this under Burnett's listing on IMDB.com
Mark Burnett Productions
640 N. Sepulveda Blvd.
Los Angeles, CA 90049
For over a year I've been developing an idea for a non-scripted show (it's currently a 9-10 page treatment) and I'm trying to figure out how I go about getting it promoted. I wrote Mark Burnett Productions and asked what I have to do to get them to look at/listen to my concept and all I got back was, "We do not accept unsolicited materials."
I make no guarantees as to the post, just did a wee google search and this was the best I found ina couple of minutes (I might be procrastinating, but I'm not that desperateto avoid work).