[James_Mac]

Originally Posted by Northwest

^^ Thanks, that explains quite a bit of it from a top view, but still confused as to how Upper Wacker is connected to the LSE Park level road. There must be one hell of a ramp in there somewhere because isn't it like 40 or more vertical feet elevation change?
There not much space there, so where is this steep grade? Under the tower there is a hill?

The park-level road is N. Field Blvd. It's going to pass under Vista to Sub Lower Wacker, exactly as it does currently, just with a building on top of it. E. Waterside Drive is the elevated road, and it's going to be extended along the north side of the Shoreham (the building south of the east side of Vista) and then turn north and pass through Vista to connect to Upper Wacker. After it turns north it will presumably be renamed Upper N. Field Blvd., or something similar. So roads will pass through Vista at two levels, one on top of the other, with no need for an elevation change for either.

EDIT: Here are slides that show the two levels, taken from the same Curbed article:

1. LOWER LEVEL/PARK LEVEL




2. UPPER LEVEL (E. Waterside Drive / N. Harbor Drive level)