The exits are determined by the size of the building and your zoning codes will tell you that.

that is a loaded question. There are many types of wallpaper and depending on the prep that was done to the walls prior to install. usuallu I say yes. a paper tiger, DIF and lots of patience....and hot water. I try to peel the surface or topping paper off to expose the paper backing then apply the hot water ? DIF mixture with a pump sprayer...taking EXTREME CARE AROUND OUTLETS AND SWITCHED!!!. Protect the floor with plastic or drop cloths and allow the mixture to do its job....follow the directions to the letter. Using a drywall knife to carefully remove the paper once it is loosened up. If you are VERY LUCKY...sometimes you can literally peel it off with your hands.
But don't count on it. Hopefully it was hung over a properly sized wall.