One Nine Elms One Nine Elms consists of the new build development of two tower buildings. City Tower, a residential tower of over 57 storeys and River Tower, a residential tower over 42 storeys which includes a 5 star hotel. Designer Group will be completing the mechanical shell and core works consisting of the rainwater, sanitation, LTHW, comfort cooling, heating, ventilation, insulation, chillers, cooling towers, smoke extract and public health works. One Nine Elms is a 149 week programme which commenced on site in July 2019.