While measuring the dimensions of the workable area, I found that I could drag an object outside the boundaries. You cannot place an object there directly, but any object can be moved FAR outside the boundaries on all four sides. The arrow in the one pic points to a hotel I moved to the far corner limits and you can see it's way beyond the normal working area.
Tested in a couple of the biomes. Please don't "fix" this!!
Tested in a couple of the biomes. Please don't "fix" this!!