The foundation is giving way to the passing of years.
You wonder when looking in the windows of the buildings as to just how much was actually left behind and how much was placed or staged by the Park Service.
This interior shot looks pretty much as it was left by the owners
although I would not leave my coat behind.
My guess as to why that first step out the door is a big one would be due to all the snow they had in the winter. Best have the door up a ways from the piling up of snow.
The steps down have long since disappeared.