I am looking into doing some renovation work on a small 4 tenant commercial space. The structure is an older large home that over time has been crudely divided into 4 small commercial spaces.Each space has it's own bathroom with a GFCI receptacle adjacent to the sink, fed from a general purpose 15 amp circuit. Is a 20 amp circuit a requirement for a commercial bath? 3 of the 4 spaces will be very difficult to pull new circuits in if it's required. Thanks.