The council shall have power to avail itself by ordinance of any law of the State of California now or hereafter in force and comply with the require-ments thereof whereby assessments may be made by the assessor of the county in which this city is situated and taxes collected by the tax collector of said county for and on behalf of this city. Other provisions of this Charter concerning the assessment, levy and collection of taxes shall be subject to the provisions of any such ordinance while the same shall be in force.