Exceptions. Every part of a required yard shall be unobstructed by any portion of the building, except for the ordinary projections of window sills, belt courses, and other ornamental features to the extent of not more than four (4) inches. Cornices and eaves may extend two and one-half (2 1/2) feet into a required yard provided they do not extend closer than two (2) feet to a side lot line. In any district when a parcel of record at the effective date of adoption of this Title is less in width than required by the terms of this Title, then the side yard requirements may be reduced by not more than fifty (50) percent.