Had you checked their annual report for 2004, you would have seen that the original place of business in California was 25800 Commercentre Drive, Suite 100, Lake Forest, California 92630. I don’t recall when they moved to Rancho Santa Margarita, but if you really want to know, check their annual reports (form 10-k). It always contains their business address.
It is odd that they moved back to LF, after RSM, but that’s what they did.