Tenochtitlan was an island in the middle of a lake that was expanded by pounding stakes into the lake bed and lashing them together with reeds, then pouring earth into these artificial islands. These islands didn't float, thought the lake made sure that water levels stayed fairly constant.
That said, Tenochtitlan gives us many, many ideas on how a sea city could work. It is like a huge checkerboard with canals like streets on a pre-planned city.
Sea level rise might eventually reach 60 meters, so earth work will be very expensive compared to a floating island. Problem is, how to anchor them???
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