Introduction to Shangshu Di: The "Shang Shu Di" in the North Courtyard was built in the Jiachen year of Kangxi in the Qing Dynasty (1664). A horizontal plaque with "Shang Shu Di" is hung on the lintel, and a golden plaque with "Father and Son Jinshi" is hung high on the entrance door indoors. According to experts, this former residence is a typical representative of an official residence during the Ming and Qing Dynasties and has high archaeological and artistic value.