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 providing notice and holding a hearing on the proposed modification in the manner set forth in NRS 271.380 and 271.385. 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.