The guide will be checking in guests the Northwest corner of Union Square - Powell and Post Streets - opposite the St Francis Hotel, from 15 minutes before the tour is due to begin.
Be sure to allow extra time for traffic and finding parking. We CANNOT wait for latecomers, there are other guests.
Tour ends outside this historic bar (the oldest continuously operating one in San Francisco). It's a 15 minute walk from the meeting point (around one mile distance).