Cal. Streets and Highways Code § 35305

Whenever an ordinance is adopted pursuant to this section, whether in response to a proposal made in the petition or otherwise, the legislative body may, at the hearing on the resolution of intention or subsequent thereto, increase, decrease, eliminate, change or otherwise modify the lands to be so held, used and treated, the improvements to be made or constructed thereon, or the compensation to be paid the city for said city lands, in the same manner and by the same procedure as provided in this part for increasing, decreasing, changing or otherwise modifying the acquisitions and improvements to be made, and in that event the legislative body shall adopt a new ordinance pursuant to this chapter consistent with such changes and repealing the prior ordinance or shall amend the prior ordinance. No such increase, decrease, elimination, change or other modification shall be made in violation of the provisions of any ordinance, resolution or indenture providing for bonds already issued.