Lenny,
Thank you for your reply! Your interesting shot is pretty much what I see when looking into my courtyard from ground floor or above. Yes, when I stand in courtyard all is black. Will try your suggestions as soon as I can. I don't remember the transparent floors tiles but will look again. They might simplify the skylights for two of the above ground rooms. Right now, all I see is a blue hole in the white ceiling while using a roof with the glass roof type.
Not sure what you mean by 'normal' rooms when basement building. Right now, I make a ground level building to unlock the go down to basement arrow, then once there lay out the basement structure. The courtyard is made by highlighting it's surrounding wall, going up to ground, clicking on the yellow outline, and choosing to remove ceiling.
Good job on that sci-fi looking courtyard. It fairly shouts to go there for adventures.
