In the R-1 through R-18 zones and in the NC zone, a building that contains a grouping of attached townhouse units shall not exceed a 200-foot maximum length without a separation of at least 10 feet from other groupings or rows of townhouses. (Ord. 10-10 § 3 (Exh. C); Ord. 42-02 § 2 (21A.14.060))