The following features of a building hereinafter set forth may project into a required yard to the extent specified:

    A.    Eaves, or any other architectural features may project beyond the front, rear, or side wall a distance not greater than two feet;

    B.    A landing place, or uncovered porch, and stairway leading thereto which serves a dwelling unit entrance not greater than six feet above the ground level, may project into a required yard a distance not greater than three feet;

    C.    A building wall encroaching two feet or less into a required yard may be extended so as to continue the same building wall line but may not reduce said required yard to a dimension less than that previously provided. (Prior gen. code § 8-60.37)