Jonathan was a great guide. He remembered all 11 of our first names, which was a nice touch. Lots of historical background; very interesting! Tour ran 90 minutes, which was just right. Group was limited to 15 people which allowed us to all hear Jonathan and still stay socially distant, which was important to me.
I would have liked a map of the Terminal. I would have jotted some things down and would help me navigate Grand Central after the tour. (I had to ask for directions to go back to one of the places we visited.)