Do all Jiangsu people work in Jiangsu Building in Beijing?

Not sure. Because Beijing Jiangsu Building is an office building located in Chaoyang District, Beijing, there is no direct contact with Jiangsu. So the people working in this building are not necessarily from Jiangsu, they may come from all over the country and even abroad. The native place and personnel composition of employees of enterprises, institutions and individuals in buildings should be diversified.