http://www.insidesocal.com/horseracing/
Excerpt:
One of the main reasons Charles is leaving is because of MI Developments' decision to terminate its agreement with the Oak Tree Racing Association last week, according to the source who requested anonymity because he's not authorized to talk about the subject.
It's not known if Charles, thought by some to be a leading proponent of synthetic surfaces, is leaving on his own or is being forced out. Santa Anita is currently in the process of deciding whether to return to a dirt track or stick with a synthetic.
MI Developments is still under the umbrella of Frank Stronach, who is a known anti-synthetic man but says he went along with the California Horse Racing Board's mandate for artificial surfaces for the good of the sport in California.