How would i find more info on the mansion used in the movie xXx ?

Question

i am trying to get info on some of the internal features of the house

Answer 1

Find out what it is called by reading the location credits in the film. It may be open to the public, it may be privately occupied. If that the case, all you will find out is whats in the credits.

Could be they only used mansion a for the exteriors and mansion b for the interiors, etc, etc, So what you are, in reality, seeing may be many places, as well as studio set constructions. this may all be crap as I have no knowledge of this film. It is however common practice.