Yes, there is underground parking, in fact, thats where l parked. Its free, and gets filled pretty quickly though. You catch the elevator and it will put you tight in the mall. I highly recommend that you snap a picture of the signage of which level you parked so that you're able to find your vehicle after shopping. Be calm and shop on!
Yes
Yes they do have direct access to the mall
Underground parking garages have direct access to the Galleria mall. Not sure about the train, though.
Yes they do
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