I'm on the fourth floor and also have the minor step down in the ceiling in the same spot, 9' ft down to 8' like you mentioned. I was actually worried about it visually before seeing it, but it really is very minor! Love your choices for the bathroom!My unit is a bit odd. The ceilings drop from 9’3” in most places to 8’, so that bulkhead is structural. I didn’t mind so much because it’s in the living room / bedroom and I figured it’d feel cosy. I think most units are 9’ concrete standard, though I think all the sliding doors are a standard 8’ — could be wrong.