Fei Lai/Shanghai Daily news

To protect the local heritage and pave the way for reconstruction of the old town in Songjiang District, the local government is conducting an overall survey of Cangcheng and Fucheng, two sites of historic and cultural importance in the district.

More than 30,000 drawings have been made by 100 technicians who researched more than 1,800 houses and buildings at Cangcheng, officials said yesterday.