Re: Uneven Floor Levels
Curious if the corner in question is around the area of the fireplace?
My guess is that the house was built first, then the garage, then the room over the garage, since there is a place in a corner of the room where the exterior of the fireplace is visible and also part of the siding.
Also ... since this room sits on top of the garage it may be possible the garage foundation may have settled in that corner.
Depending on how this room was constructed as well as the construction of the garage to support this room would have some affect on things.
It's hard to tell from here sight unseen.
"" an ounce of perception -- a pound of obscure "