A system for transmitting liquids between a stationary core and a rotatable story of a building includes annular buffer ducts, each having a lower duct portion and an upper duct portion in liquid communication with and slidingly engaging the lower duct portion via an interface. The lower and upper duct portions are fixed to the stationary core and rotatable story respectively, or vice versa, so that the lower and upper duct portions are rotatable relative to each other. The buffer ducts internally define a transmission chamber into which liquid enters through inlet ports formed by the upper duct portion, and from which liquid exits through outlet ports formed by the lower duct portion. The buffer ducts also include a supply duct connected to clean water pumps for increasing the water pressure in clean water accumulation tanks to a desired value. The transmission chamber is at atmospheric pressure.