According to IMDB, I looked up filming locations for the movie "The Bodyguard". The Greystone Estate in Beverly Hills is listed. Under "trivia", it says Rachel's mansion is the same one used for the horse's head scene in the Godfather. Mansion <~~is a website of famous filming locations. The pictures of the mansion look familiar. There's one picture if you click on it, it gives a view of Los Angeles from the house - the landscape is very similar when you see Woltz and Tom walking around the grounds.