unless you live car free, such an environment dictates some sort of a parking garrage which will cost the residents money to use. I saw this in Washington DC and it was very walkable. Parking was minimal and there was some need to drive around if the one spot in front of the building was taken. But we didnt use the car much at all, so it didnt matter. The Malcom X park and the Metro station were within walkable distance, so was Target, Whole Foods and Safeway.
This is true when density levels reach a certain point. However, in our case, it would be moving parking lots from the front to the back of the buildings. This is proving to be quite successful in sunbelt cities like Norfolk, Charlotte and Atlanta.