10-2-2: YARDS:
   A.   Front Yard:
      1.   There shall be a front yard having a depth of not less than twenty feet (20'); provided, however, that where lots comprising forty percent (40%) or more of the frontage developed with buildings between cross streets having an average front yard with a variation in depth of not more than six feet (6'), no building hereafter erected or altered shall project beyond the average front yard line so established; provided, further, that this regulation shall not require a front yard of more than forty feet (40') in depth.
      2.   Where the block has been developed forty percent (40%) or more and the front yards of existing buildings do not vary more than six feet (6'), new buildings shall not project beyond the average front yard line established by the existing buildings.
      3.   Where buildings front on a side street (or a street not parallel to an alley), the front yard shall have a depth of not less than ten feet (10').
   B.   Rear Yard: There shall be a rear yard having a depth of not less than twenty feet (20').
   C.   Side Yard:
      1.   There shall be a side yard on each side of the building, each yard having a width of not less than six feet (6'). The width, however, shall not be less than one-third (1/3) of the height of the building and where a building fronts the street parallel to an alley, on a corner lot, it shall have the side yard on the street or avenue side not less than ten feet (10') in width.
      2.   On corner lots, the side yard regulations shall be the same as for interior lots, except as noted above, but, in the case of reversed frontage, where the corner lot is developed so that the buildings face an intersecting street, there shall be a side yard on the street side of the corner lot, of not less than the front yard required on the lots in the rear of such corner lot; and no accessory building on said corner lots shall project beyond the front yard line of the lots in the rear. (1975 Code § 10-2-2)