From the Universal Studios website, 1999
"For one particular Alfred Hitchock thriller, the script called for Janet Leigh's character, Marion Crane, to drive up a long and lonely road on a dark, rainy night, and search for a place to stay.
Ms. Leigh found more than she bargained for when she stopped at a tiny motel with twelve rooms and twelve vacancies, run by a very odd man named Norman Bates. Of course the film was Psycho, and the house that Norman lived in above the motel has become one of the most recognizable in Hollywood.
As you approach the front steps of the house and take a close-up look you will be struck by the fact that, unlike many of the one-sided sets or façades on the Backlot, the Psycho house actually has four sides and a roof.
And, if you look really carefully, you may still be able to spot Norman's mother peering out of the upstairs bedroom window, still rocking in her chair. "

The Psycho house was one of the big draws of the Universal Tram Tour back in 1964, and continues to be instantly recognisable even now. The links below explains some of the history of the house and it's frequent moves, along with some exclusive photos.

More details:

• Bates Motel Refurbishment photo gallery
• Psycho House locations
• Mother attacks the tram
• Psycho House photo gallery
• Psycho Movie page (including links to stills)