Finding the address of the Ban Dojo would be quite easy, even without the assistance of the note. No assistance of the note was needed since the note was actually blank. It appeared from the note being blank that Sumi probably had no intention of actually letting them train at her place. She seemed quite serious when she told them to just ignore their power and leave all else alone. Still with Sumi's last name (since she wasn't actually aware that they could see that) and searching martial arts dojos in the area (since she was clearly a martial artist) it was quite easy to find the address of her dojo online. Whether or not going there was smart, however; was an entirely different story since she had given Silas a blank piece of paper instead of a note.