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5 Answers

Guil Hernandez
Treehouse TeacherHere's some evidence that it's real - a behind the scenes video. :)

Guil Hernandez
Treehouse TeacherThe background items are all real. :)

Steven Parker
221,070 PointsBetter confirmation than a link — Thanks, Guil!

Steven Parker
221,070 PointsI wondered that myself, but I recall another similar question where a teacher answered and said the set was real.
I don't have a link handy or I'd post it.

Juneau Lim
13,362 PointsA watched video again to see what stair you meant.lol

Steven Parker
221,070 PointsI think they are "Winchester mansion" stairs .. going up to a solid ceiling.

Ryan Agatep
Full Stack JavaScript Techdegree Graduate 17,693 PointsI can't un-see the background. :D
Steven Parker
221,070 PointsSteven Parker
221,070 PointsVery cool video!
But perhaps "real" wasn't the right question — a better one might be: Are those stairs functional, or just a prop?
(It would appear to be the latter).