Boundaries. Zoning boundary lines must be described by legal description or by a map that accompanies the ordinance establishing the district or amending the district boundaries. When a legal description is used, the boundary is deemed to extend to the center line of abutting streets. When a map is used, boundary lines must be established by dimensions, property lines, recorded lot lines, or the center line of abutting streets, alleys, or railroad rights-of-way, as those features were of record at the time of adoption.