 When Zhang left office, Shandong's GDP had exceeded 2 trillion yuan (~$300 billion), ranking second among provinces in the country.Shortly after the 17th Party Congress held in October 2007, the central leadership moved Zhang in a provincial leadership reshuffle to become party chief in the coastal city of Tianjin.As the party leader of a direct-controlled municipality, Zhang also gained a seat on the Politburo of the Communist Party of China.