“Common open space” means that portion of lot or parcel not developed, built upon or occupied by buildings, parking areas, driveways and the like; other than minimal appurtenances such as walkways designed and intended to make such open space usable and accessible, and the use of which is intended for and accessible to all of the persons residing in the development of which the open space is a part. (Ord. 583 §2.09(C) (part), 1980).