In 1902, the Imperial Tobacco Company and the American Tobacco Company agreed to form a joint venture: the British-American Tobacco Company Ltd. The parent companies agreed not to trade in each other's domestic territory and to assign trademarks, export businesses, and overseas subsidiaries to the joint venture. It built the Imperial Tobacco Company Building at Mullins, South Carolina, between 1908 and 1913. It also established its own leaf-buying organization in the United States through its building, the Imperial Tobacco Warehouse, in Durham, North Carolina, which is now owned, and has been renovated by, Measurement Incorporated. American Tobacco sold its share in 1911, but Imperial maintained an interest in British American Tobacco until 1980. In 1973, the Imperial Tobacco Company, having become increasingly diversified by acquisition of (amongst others) restaurant chains, food services and distribution businesses, changed its name to Imperial Group.