(b) Amendments to the district plan which provide for additional improvements or services or any change in the method of assessment upon which the district charge is based, or an increase only in the amount to be expended annually for improvements, services, maintenance and operation may be adopted by local law of the legislative body, provided that the legislative body shall, after a public hearing, determine that it is in the public interest to authorize the additional improvements, services or increase in the maximum annual amount and that the tax and debt limits prescribed in section nine hundred eighty-k of this article will not be exceeded. The legislative body shall give notice of the hearing by publication of a notice in at least one newspaper having general circulation in the district specifying the time when and the place where the hearing will be held and stating the increase proposed in the maximum amount to be expended annually. The notice shall be published once at least ten days prior to the date specified for the hearing.

(c) Amendments to the district plan which provide for the district to incur indebtedness in order to provide for additional improvements or which provide for an increase in the total maximum amount to be expended for improvements in the district, may be adopted by local law of the legislative body, provided that the legislative body shall, after a public hearing, determine that it is in the public interest to authorize the district to incur indebtedness to provide for additional improvements or to increase the maximum total amount to be expended for improvements in the district and that the tax and debt limits prescribed in section nine hundred eighty-k of this article will not be exceeded. Notice of the hearing shall be published and mailed in the manner provided in section nine hundred eighty-e of this article. The local law adopted pursuant to this subdivision shall not be effective until reviewed by the state comptroller in accordance with section nine hundred eighty-g of this article.