On its own motion or on the application of any owner of land within the benefit district, the city council may eliminate or reduce the special development assessment for any parcel, on the ground that the assessment was incorrectly calculated, that changed conditions have reduced or eliminated the benefit on which the assessment was based, or that the parcel has come under the ownership of a public agency. The city council may increase the amount of the assessment for a parcel only by proceeding as for the formation of a benefit district, except that the amount of the assessment may be escalated over time as described in the approved benefit district report. (Ord. 1826 NCS §1 (part), 1990.)