change a room from diagonal to straight?

Just downloaded a room and when I try to place it it's diagonal. I can't get the rotate any less than 90 degrees which means no matter what I do it's a diagonal room. Anyone know how I can make the room straight, obviously without making a new room and moving all the objects one by one; which defeats the purpose of downloading a room. I tried several cheats and nothing works.

This is a room I want to rotate, not an object so alt won't work.