THE Trade Development Council (TDC) is planning to open two more offices in northern China to help Hong Kong and overseas business tap the lucrative mainland market. A full office in the northeastern city of Dalian and an advisory office in the port city of Tianjin will be opened next year. A third office in a coastal city is being considered. The TDC's senior director in Beijing, Stephen Mak, said Dalian was one of the more prosperous cities in the northeast, and was rapidly developing as foreign companies were making investments in the city. Tianjin, one of the three Chinese cities - with Beijing and Shanghai - directly under the jurisdiction of the central Government, will initially have only an advisory office employing local representatives. The trade promotion organisation is also planning to set up its own office in Beijing for future expansion to cope with its more important role of overseeing activities in northern China. Mr Mak said the TDC had positioned itself as a ''Pacific bridge'' to serve both the Hong Kong business community and business from other countries in the promotion of trade. ''We have been doing this for some time, but recently there has been a significant increase in enquiries from overseas markets, including the United States, seeking information on entering the Chinese market,'' he said. Mr Mak said enquiries had also been received from several state governments in the US. He said the TDC's assistance to US companies for expanding the Chinese market would be helpful for the renewal of China's Most-Favoured Nation status. Mr Mak said the Chinese Government's macro-economic control measures would only affect speculative activities. The retail sector and property development for productive purposes would not be affected, he said.