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Rip out the sub floor (not really necessary but I always feel that a piece of 3/4" plywood sub-floor is much stronger and better way to go) Lay waterproofing on top and use whatever brand you choose and their thinset. Run the thin waterproof membrane up the wall for at least 6-8". Assuming you drywall on top of that and not plaster for historical or restoration reasons, how would the base board be finished? I suggest the same as floor tile, not always the prettiest but it will be durable for a coffee shop where the cleaning crew will not care. As far as the floor is concern, it should be sloping toward the drain depending on the location. The problem with that is the P-trap must be filled with water at all times to keep sewer smells or bugs away. A trap primer should be code.
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