Considering the low lying areas along the coast will be both flooded and bombarded with augmented hurricane activity, and the southwest running out of fresh water, there will be a large migration back to regions where most people lived a century ago.
Floating cities near the coasts may become feasible, as well as arcologies. The hollowed out urban centers will need to redensified. Job opportunities in the declining smaller cities and small towns (especially in the rust belt) would provide a setting for those wanting a more suburban lifestyle while preserving open space in the larger metro areas. The great lakes region will see a rebirth as the climate becomes more tropical and a reliable fresh water supply is needed.
