While Beth Sarim has garnered much coverage, Beth Shan hasn't. It was a colossal pain in the neck finding the location, but I finally tracked it down. Here are Google map links to the locations, so you can see them for yourself.
Beth Sarim 4440 Braeburn Road, San Diego, CA 92116
Beth Shan 4825 Avion Way, San Diego, CA 92115 (main house; original compound covered several current lots)
You can compare the current view with this old photo of Beth Shan.