I actually had 18x18, I wanted to demolish and move it a few tiles over to prevent people from placing a plot next to me and blocking the view of my beutiful home with their ugly multi colored ice/lava/water works/wooden/marble box-shaped home. And I did it and it worked, I just wanted to be certain, I just set my worthless junk outside demolished and rebuilt and quicky put the junk back in. I was just concerned had there been a delay, I would had to deal with packing and moving lot of heavy junk for storage.When resizing all stuff falls on ground.
I don't understand why you want to demolish and then place. You should resize.