A lot, which abuts or is immediately across an alley from an R-1, R-1E, or R-2 residential zone and which contains five or more dwelling units, shall have a six-foot six-inch solid or interlap fence on the side or sides abutting or across an alley from the lower-density residential zones. The fence shall be well built, finished and maintained. (Ord. 05-003 § 4, 2005)