In any residence district, where the front yards of existing principal buildings in the same block front are greater or less than the minimum required front yards for such district, the required front yard depth shall be modified as follows:  Any principal building erected or altered after April 26, 1969, on a lot in such a block front shall provide a minimum front yard at least equal to the average setback of the two nearest principal buildings to each side of such lot in the same block front. If no existing front yard of a principal building exists to one side or the other of such lot in the same block front, the minimum setback for the district shall be used in computing the average setback, except in the case of a corner lot having a front yard in the same block front, the setback of the lot shall not be less than the setback of the nearest principal building in the same block front; provided the depth of a front yard on any lot shall be at least ten feet and need not exceed 50 feet.
   (a)   Steep slopes, front yard garage.  In any residence district where the natural grade of a lot within the required front yard has an average slope, normal to the front lot line at every point along the line, of such a degree or percent of slope that it is not practicable to provide a driveway with a grade of 12% or less to a private garage conforming to the requirements of this chapter, such garage may be located within such front yard, but no in any case closer than six feet to the street line.
   (b)   Double frontage lots.  Front yards on both streets shall be required, where on a given block face there are dwellings addressing off both streets. There shall be no vehicle access to an accessory building from more than one street unless authorized by the Traffic Engineer of the City, who shall review the second access in relation to traffic flow, movement and safety and find that there will not be an adverse effect. In no case shall an accessory building with vehicle access across the rear lot line be nearer than 18 feet from the rear lot line. See Appendix, Illustration 50-96(b), “Typical locations of accessory buildings on double frontage lots,” at the end of this chapter.
(Ord. 2046, passed 4-11-1968; Ord. 2845, passed 7-26-1982)