There is a parking structure and surface lot right next door. There is also limited paid street parking.

I believe you can on the ground floor.

Yes you can move about the place. Do your own research to appreciate what you are looking at as that will make it so much better historicdetroit org Have a good time!

I would seriously consider signing up for a guided walking tour of Detroit to get a real taste of the downtown. However, if that isn't possible and if the free tours of the Guardian and Fisher at Pure Detroit building don't work for your schedule , then you can go into both buildings and as they are public buildings, The Fisher building has live theater and you can see a great "Broadway" production there. The Fisher building has a hallway that reminded me of the hall of mirrors in Versailles.

You should be able to count on lobby doors to be open 10:00 am to 8:00 pm Monday through Saturday