Re: [NEEDS INPUT] Basement Split Level Rooms: Irremovable Basement Floor (1.66)
I tested this both by doing a test build and downloading your save.
In my test build in a vanilla game, I could not make it happen. No dirt floor appeared for me. I was able to paint the upper level walls with no problems
However, in your save, also in a vanilla game, it did happen. But at first it didn't. I entered the lot in build mode straight from the map and painted the upper walls with no problems No dirt floor appeared. But after reloading and going into the lot in live mode then going into build, when I tried to paint the upper level walls, the dirt floor appeared and you are right, once it shows, it can't be deleted any way I tried. But I was able to make it go away. After I figured out that I couldn't delete the dirt floor, I used the undo arrow to back completely out of everything I had done and started over. This time though, the dirt floor did not appear when I tried to paint the walls. After that, no matter what I did, the dirt floors did not reappear.
So there is some type of glitch on that lot but it might be fixable. So I suggest you try again and see if using undo will fix it for you like it did for me once the dirt floor appears.
Hope this helps.