The building of Beijing's sub-center aims to relieve Beijing of functions non-essential to its role as capital and boost the coordinated development of the Beijing-Tianjin-Hebei region. Located in Lucheng Township, the eastern suburb district of Tongzhou, the project covers an area of about 155 square kilometers, with a total construction area of 3.8 million square meters. [Photo by Dong Ning/China.org.cn]