I've looked at all the info provided on IMDB as well as Wikipedia and a few others. I couldn't find any mention of what building and grounds were used for Dominian's mansion. It was spectacular, especially the tunnels. I also find it interesting that nobody brought up how implausible that Dominion losing one hand of poker would ruin him financially. As if the whole premise was plausible, I did find that rather weak. One more question, why bring the woman to the poker game which was dangerous to say the least. Oh, that's right the place was surrounded by police. I guess they were taking a break when she was whisked away. Good thing all of the bad guys were lousy shots.