It’s too early for a definitive assessment of the rest of the ground floor, which will contain a Walgreens and a food hall that open onto the planned riverfront plaza. But Gensler has dealt smartly with the cavernous open space in the middle of the floor, creating a raised wood and stone platform that conceals escalator equipment that would normally go underground but can’t here because Amtrak and Metra trains run below. Picking up on the building’s past, a tall wall of lights along the escalators is adorned by a metal pattern that recalls the building’s multitude of conveyors.