1921年2月15號《廣州市暫行條例》公佈實施，廣州市政廳成立，孫科任廣州市首任市長，廣州建市，成為大中華第一個建制市。同期，廣州市政公所改為市政廳工務局，負責規劃新闢街道、公園、市場等工程事項。
On February 15, 1921, the "Provisional Regulations of Guangzhou City" was promulgated and implemented, the Guangzhou Municipal Hall was established, Sun Ke served as the first mayor of Guangzhou, and Guangzhou was established as the first city in Greater China. At the same time, the Guangzhou Municipal Office was renamed the Public Works Bureau of the City Hall, which was responsible for planning new streets, parks, markets and other projects.