I did "Go Pro" 27 years ago. When you placed the word "Dream" in there i began to assume you were asking if people had actual sleepy-dreams they were operating a Haunt?
I have those dreams sometimes. Always very maddening! (Just as an actual Haunt business can be!)
In those bad-haunt dreams way too many potential customers are haranguing me,making my life miserable.
i have had other bad-haunt dreams in which half of my place is an extremely decrepit lean-to-shack, with all the problems associated.
A few times in -dream, it is an old building my Dad tore down 55 years ago (I am 65) He had left it "stand" for my own haunted house (Didn't happen in actuality)
I think your "Warehouse" idea is good. It may free you to have anything you can find in it. Totally non-limiting as compared to almost everything else with some specific definition like words like "Barn" Asylum" Hospital" School" or even "Haunted House".
"Warehouse" might mean "Theme-less" OR "Every-theme!" I see nothing wrong or lacking if this was what happened because when some complain about mixed-monsters, themes and then say the "Decor" wasn't quite right for a certain theme, well how many times Can that ever happen?
I think it usually doesn't happen because most people won't be spending 10 years "gathering" nick-nacks,furniture, ascesories that should be in-place to attempt to span that space from" Here" to" Fantasy-There".
If your Warehouse was a warehouse,maybe numerous wooden crates could replace building walls, and What is inside these crates? Each one could be So different from the next.
You could open and close certain crates to change your show from gory to one for little kids or for just Adults.
We do a little "changing' for certain types of audience by just not turning on certain lights in a certain room.
What I am referring to is simply a mannequin being dressed, because she's supposed to be dressed, then later , some customers have had fun making her un-dressed.
Anything found here considered "Gory" ,.. the person saying this or thinking that about stuff here would have to be from a totally different "world'", by anything resembling common standards now.
Good luck with your Dream!