a. The city map is hereby continued.
b. The director of city planning shall be the custodian of the city map, and it shall be his or her duty to complete and maintain the same and to register thereon all changes resulting from action authorized by law.
c. The city map shall be on file in the office of the department of city planning, and certified copies thereof and of all changes thereto shall be filed in the offices of the corporation counsel, of the city clerk and of the borough president of the borough in which the land shown on the map is located and in the office in which conveyances of real estate are required to be recorded in the county in which the land shown on the map is located.