Contingency Ark by Andrew Brorson
Assuming that the West Antarctic ice shelf melts, a number of cities around the world will be underwater, including Miami. The Contingency Ark is a skyscraper designed to withstand the rising sea levels that can be built in the water. Constructed from a steel lattice structure, the skyscraper features slots that mobile homes can be plugged into. As water levels rise the homes can be elevated to a higher level if necessary, or even moved to a different tower or city.