The version displayed doesnt show it as well as this one. The homes closer to the river are 3 stories total. The second row back are a story taller and the home shown (the model ) is the same height as the second row. Its not much of a hill at all.
These are some amateur photos of the Riverside Dr. facade, Corbin Street facade and part of the view from the terrace prior to completion. The house is a mirror of the design in the rendering.