Can a hotel be opened in a factory building in a former residential area in Shanghai?

You can't. Factories in former residential areas in Shanghai cannot open hotels. Industrial land is used for the production and business activities of manufacturing enterprises, and hotels do not belong to this category. Hotels must be built on commercial land with 40-year property rights for commercial land and 50-year property rights for industrial land. Industrial plants cannot be hotels, and the state's restrictions on the nature of land use are mandatory, and developers have no right to change them. Industrial land is used for production, storage, research and development, and to support some enterprises and houses.