Maintaining predominant front setback. In the NCD, RHD or CBD Districts, where a clear majority of the existing principal buildings on the same side of a block are already developed with buildings, and where the Zoning Officer determines that more than 60% of such buildings have a front yard setback of 30 feet or less along such side of the block, then if a new principal building is proposed, then at least a portion of the front building wall of such new building shall have a front yard building setback along a majority of the front building wall that is not more than five feet larger and not less than five feet smaller than such predominant front yard setback. A building shall not be built with front-facing garage door(s) that have a smaller setback than the non-garage portion of the building. The maximum front yard setback may be met with an attached front porch or a building wall. A maximum building setback shall not apply where the area between the building and the curb is only occupied by an outdoor cafe or pedestrian plaza.