The scheme at Dalian Commodity Place, a futures and commodities exchange, consists of two 260 m hihg towers rising above a number of lower blocks. These provide space for retailing plus high-quality hotel accommodation and apartments, whereas the towers are reserved for traditional office space. Each tower gains its stability from a core within an external steel tube framework (tube-in-tube structure). The core carries a share of the horizontal loads resulting from wind and earthquakes. The suspended floors are in steel-concrete composite construction, the columns to the tube-in-tube structure in high-strength concrete or composite construction.