The success achieved by the construction of the first racecourse in the late '800 increased the desire to create a larger facility that could also host international shows. The project of the architects Vietti Violi and Cantoni, began the work in 1914, but was forced to interrupt it the following year, when Italy entered the war. The new San Siro Racecourse was completed at the end of the Great War in 1919, and inaugurated on April 25, 1920.