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Wikipedia says it is a film set not an actual house
I heard it was all composed by the man behind the movie, Peter Joseph (he directed it, wrote it, pretty much everything).
Winchester Contender
"Heroic Hollywood Trailer" composed by Peter Mcisaac
Heckler & Coch P7
Sir Peter Jackson
The Fox Plaza in Los Angeles was used as Nakatomi Plaza in the movie Die Hard. It is the official headquarters of the film studio, 20th Century Fox.
Have not seen the movie, but the link below has photos and desciptions of all the guns from that movie.
nokahoma plaza (misspelled) Nakatomi plaza
The movie version starred Roger Daltrey as Tommy
I'm pretty sure they were rocket launchers or remote control missles