Cao Kun
In 1912, during a coup by warlord Cao Kun, the Dong'anmen gate was destroyed by fire. In 1914, the Corridor of a Thousand Steps was demolished to make way for Zhongshan Park, named after Sun Yat-sen. In 1915, in order to improve traffic, much of the wall surrounding the Imperial City was demolished except the southern wall along Chang’an Avenue. After the capital was moved to Nanjing, Zhongnanhai became a public park.