The County Commissioners of Anne Arundel County, in addition to, but not in substitution of, the powers which may have been or may hereafter be granted them, shall have full power and authority to create within the county limits special taxing districts and to levy on all real property, subject to ordinary county taxes, located within said special taxing districts ad valorem tax at a rate sufficient to provide adequate annual revenues to pay the principal and interest as it becomes due on any bonds or other obligations of Anne Arundel County issued for the purpose of financing the design, acquisition, establishment, improvement, extension, operation or alteration of public parking facilities, or pedestrian malls. All such taxes shall be levied in the same manner, upon the same assessments, for the same period or periods, and as of the same date or date of finality as are now or may hereafter be prescribed for ordinary county taxes.