The assessment and tax collection duties, and the collection of assessments levied for municipal improvements now performed by the assessor and tax collector of the city, are transferred to the assessor and the tax collector of the county for the purpose of assessment and collection of and for ad valorem property taxes that become a lien after the adoption of the ordinance codified in this chapter, and the collection of assessments for municipal improvements becoming due and payable on and after July 1, 1967, pursuant to the provisions of Sections 51540 through 51562 and Sections 51800 and 43072 of the Government Code of the state of California. (Prior code § 1563)