Where uncertainty exists, with respect to the boundaries of the various districts as shown on the map accompanying and made a part of this Title, the following rules apply:
(a) The district boundaries are the centerline of either streets or alleys unless otherwise shown.
(b) Where the property has been or may hereafter be divided into blocks and lots, the district boundaries shall be construed to be the lot lines, and where the districts designated on the map accompanying and made a part of this Title are bounded approximately by lot lines, the lot lines shall be construed to be the boundary of the district unless the boundaries are otherwise indicated on the map.
(c) In un-subdivided property, the district boundary line on the map accompanying and made a part of this Title shall be determined by the use of the scale appearing on the map.