1.    The front yards heretofore established shall be adjusted in the following cases:

   A.   Where 40 percent or more of the frontage on the same side of a street between two intersecting streets is developed with two or more buildings that have, with a variation of five feet or less, a front yard greater in depth than herein required, new buildings or additions to existing buildings shall not be erected closer to the street than the front yard so established by the existing building nearest the street line.

   B.   Where 40 percent or more of the frontage on one side of a street between two intersecting streets is developed with two or more buildings that have a front yard of less depth than herein required, then:

      (1)   Where a building or building addition is to be erected on a parcel of land that is within 100 feet of existing buildings on both sides, the minimum front yard shall be a line drawn between the two closest front corners of the adjacent building on each side.

      (2)   Where a building or building addition is to be erected on a parcel of land that is within 100 feet of an existing building on one side only, such building or building addition may be erected as close to the street as the existing adjacent building.