I just did another build of my favorite house. I had a moment of inspiration on just how I could add the stairs behind a door for the maid's entrance. I was successful, but later on, I decided I liked the look of the Winder staircase better. Also, I wanted to make the house a shade larger. What I found I had to do, despite using foundations to raise the entire house at once, was upon downloading it again, some of the floor levels dropped! Don't ask me how, I'm totally baffled by it. I spend a great deal of time going around the main floor fixing this little mess! Eventually, I think, I got every room on the same level. I did, however, allow the sun room off the back of the house to be one step lower, (no need for stairs). I also let the office off of the diningroom be a couple of steps lower. But what a pain in my assets that was!