TITLE FIVE - Zoning Districts Chap. 1151. Standard Zoning District Regulations. Chap. 1153. Zoning Districts and Zoning District Map. Chap. 1155. (R-1) Estate Residential District. Chap. 1156. (R-2) Suburban Residential District. Chap. 1157. (R-3) Village Residential District. Chap. 1158. (R-4) Urban Residential District. Chap. 1160. (B-1) Village Business District. Chap. 1161. (B-2) Highway Business District. Chap. 1162. (DB) Downtown Business District. Chap. 1164. (I) Industrial District. Chap. 1166. (SU) Special Use District. Chap. 1167. (MSO) Medical Services Overlay District. Chap. 1169. (FP) Flood Plain Overlay District.