Section 386.4 - Amendments to district1. The ordinance creating the district may be amended and property may be added to the district and the maximum rate of taxes referred to in the ordinance may be increased at any time in the same manner and by the same procedure as for the establishment of a district. All property added to a district shall be subject to all taxes currently and thereafter levied including debt service levies for bonds previously or thereafter issued.2. Action by the council amending the ordinance creating the district, including adding any eligible property or deleting any property within the district or changing any maximum rate of taxes, shall be by ordinance adopted by an affirmative vote of three-fourths of all of the members of the council, or in cities having but three members of the council, the affirmative vote of two members. However, if a remonstrance has been filed with the clerk signed by at least twenty-five percent of all owners of property within the district and all property proposed to be included representing ownership of property with an assessed value of twenty-five percent or more of the assessed value of all the property in the district and all property proposed to be included, the amending ordinance must be adopted by unanimous vote of the council.3. The clerk shall cause a copy of the amending ordinance to be filed in the office of the county recorder of each county in which any property within the district as amended is located.4. At any time prior to council amendment of the ordinance creating the district, the entire matter of amending such ordinance shall be withdrawn from council consideration if a petition objecting to amending such ordinance is filed with its clerk containing either the signatures of at least forty percent of all owners of property within the district and all property proposed to be included or signatures which together represent ownership of property with an assessed value of forty percent or more of the assessed value of all property within the district and all property proposed to be included.5. Any resident or property owner of the city may appeal the action or decisions of the council amending the ordinance creating the district, to the district court of the county in which any part of the district, as amended, is located, within fifteen days after the date upon which the ordinance amending the ordinance creating the district becomes effective, but the action and decision of the council are final and conclusive unless the court finds that the council exceeded its authority. No action may be brought questioning the regularity of the proceedings pertaining to the amended ordinance or the validity of the district as amended, or the propriety of the inclusion or exclusion of any property within or from the amended district, or the ability of the city to levy taxes in accordance with the ordinance establishing the district, as amended, after thirty days from the date upon which the amending ordinance becomes effective.6. All other provisions in section 386.3 shall apply to an amended district and to the ordinance amending the ordinance creating the district with the same effect as they apply to the original district and the ordinance creating the original district.