The transition looks really bad. I‘d prefer a hard cut. The grey is the foundation for another rusty wall. I think they started like that on the painted building, as well.
My fingers are crossed and I trust in Phantasia that it probably isn't finished, and will have more detailing to be added.
I'm very doubtful a park with such high quality finishes will leave this in it's current state.
Is that a joke? Ugly.