Building 7 of Hejiayuan Phase I in Tengzhou City, Shandong Province covers an area of 135 square meters. The first phase of Hejiayuan in Tengzhou City, Shandong Province is located on the west side of Kesheng Road and the south side of Xinhua East Road in Tengzhou City. There are 7 buildings, and the area of each building is different. The area of Building 7 is the largest, with 135 square meters per household.