Have not seen an elevator that used zero to mark a floor in the U.S, but here is one in the Radison Blu hotel in Amsterdam. To me this  mathematical  view for labeling a floor is natural. Even more intriguing is the use of negative numbers for floors below ground! Numerologists would be delighted.

I'm reading an entertaining book about zero: "The Nothing That Is: A Natural History of Zero" by Robert Kaplan. Seems the concept of zero took quite a while to develop.