Hello, I could not figure out, how you made the corner in the middle room, next to the bed right bottom, next to the green wall. I see that there are 2 wall tiles, but the upper one is half black and I cannot find a solution to make the grey border line on the left side of that tile, because it needed to be also only half of the tile... can you help please? 
Hello, you can find these tiles on the A5 image, here:
Please note that this is not the reborn series interior, but this interior.