Why not building such cities on the water. They have direct access to water, our most important resource we humans require. With water we can grow plants which can be used to feed animals. The natural water cycle. On water we also could use waves to produce energy, wind and the sun. It is always good to have more options instead relying on fision or fusion alone. I think of Stargate Atlantis, which in the end had a perfect idea of such a city, but only the energy was a problem. We even could use algeas to produce energy, something that is possible today. With increasing temperatures regardless of global warming or not a city on water must not face sealevel rises or shakes from earthquakes. Many benefits in my eyes.
But if money plays no role the bigger problems very likely will be the social ones. Forming a societywhere everyone is treated in the same manner would last decades.
We then just need to think how we can bring such cities into space, cause in future times earth would be no place to live anylonger. By then humans must have found ways to spread out to the universe.