Triton was a concept for an anchored floating city that would be located just offshore and connected with bridges and such to the mainland. It was a collection of tetrahedronal structures with apartments and such.

          `In the early 1960s I was commissioned by a Japanese patron to design one of my tetrahedronal floating cities for Tokyo Bay. Three-quarters of our planet Earth is covered with water, most of which may float organic cities. Floating cities pay no rent to landlords. They are situated on the water, which they desalinate and recirculate in many usefuland non-polluting ways. They are ships with all an ocean ship's technical autonomy, but they are also ships that will always be anchored. They don't have to go anywhere. Their shape and its human-life accommodations are not compromised, as must be the shape of the living quarters of ships whose hull shapes are constructed so that they may slip, fishlike, at high speed through the water and high seas with maximum economy. Floating cities are designed with the most buoyantly stable conformation of deep-sea bell-buoys. Their omni-surface-terraced, slop-faced, tetrahedronal structuring is employed to avoid the lethal threat of precipitous falls by humansfrom vertically sheer high-rising buildings.'

quote from Critical Path, by Buckminster Fuller, p. 332.

3DS Max model render