The No.1 Building stood in the front of the site where the No. 2 Songjiang High School lies today. It is unknown when it was erected but it was acknowledged as the construction of the Yuan Dyanasty by authorities. It has been called the No. 1 Building in Yujian since the period of Tong Zhi of the Qing Dynasty for it was the largest one at that time according to the legend. Japanese soldiers damaged it in the period of the War of Resistance Against Japan (1937-1945) and only the frame was left. The frame was ruined by the gale of 1951 and the base can be found only today. It is one of the two palace-like buildings of post and lintel system kept in China.