(a) Upon the recommendation of the Department, the County Council, by ordinance, may adopt an official map containing:
(1) The exact location of the planned lines of street widenings and extensions, or of future streets;
(2) The lines of all public streets then existing which have been established by law;
(3) All planned streets or street lines previously adopted under this section;
(4) All streets or street lines as located on the final or recorded plats of subdivisions as previously approved by the Department;
(5) All existing or planned public parks and other public open spaces.
(b) After adoption of the official map or street plan, no amendments thereto showing the location of a planned or mapped street shall be adopted before public notice shall have been given to the owners of record of the land upon which, or abutting which, lies the future street lines designated upon the plan.
(c) Any map or plan adopted prior to May 26, 1965, under Chapter 25 of this title, shall remain in effect until the County Council acts under the provisions of subsection (a) of this section.