Movie trivia question - "How To Steal A Million"

I love the movie How To Steal A Million. I think it’s funny, sexy and stylish. Even if I didn’t like it as a movie, I’d tune it in just to listen to Peter O’Toole’s soft, musical, seductive voice.

But what about that wonderful, over-the-top Parisian mansion that Audrey Hepburn and her father lived in? I like to look up filming locations in IMDB, but they’re not that specific. I’d like to find out its name and check out its history. And if I ever get to Paris, I’d go and look for it.

Do any of our movie experts know more about the mansion?