Dreams
Last time it led to a sort of loft that could be seen from another stairway to the house behind some vertical slats, and also a mechanical section that housed the heating and telephone/cable incoming lines. This morning it led to a whole new floor with several furnished but obviously abandoned and forgotten rooms. Some of the rooms were just full of things like a previous owner had just up and left in a huge hurry before the entire floor was blocked off. It was very strange.
Dreams
It got weirder when I discovered one of the upper levels was occupied, but it was only because I had Super Mario games in the house, and their continued existence relied on my having those games in the house. Luckily for them they didn't have to worry because I will always have Super Mario games in my possession!
Dreams
There was one room that was completely barren with a rotted out hole in the floor, that opened up to another room with a rotted out hole, that led to another with another hole, that appeared to go on for like 5-6 floors, maybe more. The holes were offset from each other. Which is weird because I'm sure I was only on the third floor at most. But dreams are weird.