All existing plans, regulations, resolutions, ordinances and codes and all amendments, supplements and changes thereof adopted under prior existing planning acts, and all actions taken under the authority thereof, are hereby validated and continued in effect until amended, revised, or repealed by appropriate official action taken under authority of this act.¹ Any comprehensive plan heretofore filed of record in the office of the County Clerk of said county by the presently existing City Commission may by resolution of the Commission be withdrawn from record and the recording of such resolution of withdrawal in the office of the County Clerk shall be authority for the exclusion from abstracts of title of such plan so withdrawn.