Front yard. There shall be a front yard of not less than 40 feet except that where the existing building on the same side of the street and within 500 feet from an established setback, new buildings shall conform to such established line, provided no new building may project closer than 35 feet to the front property line nor need setback more than 50 feet from the property line. Off-street parking as required is permitted in the front yard area, provided however, that it is limited to the area intended, designed or used as a driveway.