After Shima's dismissal for misgovernment in Hokkaido, Iwamura Michitoshi supervised the urban planning of Sapporo. He remodelled the original plan in 1871, and Kabō-sen (火防線) was constructed in the place where Odori Park is currently located. The Kabō-sen was a firebreak consisting of 105 metres of largely vacant land, which often prevented the progress of fire during the Meiji period.