Is there any way to make unbuildable terrain buildable?

Is there any way to make unbuildable terrain buildable?

Just for starters.. I know that there is already a way to do this, but this seems to be used in very small quantities. Is there a way I can make ALL of my unbuildable terrain buildable, or a way that would be much quicker to do?

Easiest way there would be to edit the buildings and remove the "requires buildable" requirement if you want to make unbuildable areas buildable.
-VGsatomi

Thanks for that, that was just what I was looking for. That was brillant, THANKS