It's not going to get that deep, or do so that fast.

I am thinking about buying some beachfront property near the Fall Line for my descendants to inherit, though.

Visit a body modification shop and ask for some gills.

Fortunately it will take more than 6 years for coastal cities to start flooding that much. By the end of the century it is forecasted to go up by less than 2 meter worst case. In 2000 years it could rise as much as 20 years if the temperatures rise 5°C.

Additionally it is much easier to just move to higher ground.