The site, in the former Fudeli shikumen (stone-gate) neighborhood, was home to founding CPC member Li Da, who moved into building No. 625 with his wife Wang Huiwu in April 1921. Comprised of rows of similar-looking shikumen buildings, Fudeli was a wealthy neighborhood near the former international settlement. It became one of few remaining clandestine sites that survived police raids and shielded secret meetings. On July 16, 1922, 12 CPC delegates gathered in secret at Li’s house to attend the second national congress. Over eight days, they drafted the first CPC Constitution, consisting of six chapters and 4,000 words.