The guide will be checking-in guests from 15 minutes before the tour begins at at the SIDE entrance to Union Station, on Alameda Street (near the taxi rank). Be sure to allow extra time for traffic and finding parking. We CANNOT wait for latecomers, there are other guests.
Grand Central Market is one of the best food destinations in the whole US and a great place to finish the tour. It's a 20 minute walk back to the starting point for the tour.