If a new laundromat was built in the same parking lot the sales will be affected big time. I’m assuming the one your looking at is a zombie mat. That’s the only reason a person would have the balls to build right next door. It is possible for new and older laundromats to coexist but you really need to proceed cautiously in this situation. Honestly only time will tell what the sales will be. It can take a year or so for all to balance out.