An association with which a governing body contracts pursuant to NRS 271.332 may, at any time, request that the governing body modify a plan or plat with regard to the neighborhood improvement project. Upon the written request of the association, the governing body may modify the plan or plat by ordinance after holding a hearing on the proposed modification pursuant to NRS 271.377. If the proposed modification of a plat expands the territory for assessment, a person who owns or resides within a tract which is located within the territory proposed to be added to the improvement district may file a protest pursuant to NRS 271.392 at any time before the governing body modifies the plat by ordinance. A petition is not required for a modification made pursuant to this section.