When lots fronting one side of a street within a block have established building setbacks of a depth other than required in this chapter for a front yard in the district in which the lot is located and where the contiguous street is not designated on the official map for right-of-way widening, the setback for each remaining lot along such street frontage shall be as follows:
   (A)   Interior lots.  The depth of the setback on any lot shall be the average of the setbacks already established on the two lots located on each side of such lot, and if no setback is established on one of the adjacent lots, the required front yard depth for that lot shall be used in calculating the average setback of the two adjacent lots; and
   (B)   Corner lots.  The depth of the setback lines shall be as required in this chapter for front yards or side yards adjoining streets in the districts where the lots are located.
(Ord. 1999-2, Zoning § 3, subs. .100, passed 2-15-1999)