No cause of action or defense founded upon the invalidity of any proceedings taken in closing any street or alley may be asserted, nor shall the validity of the order be open to question in any court upon any ground whatever, except in an action or proceeding begun within 30 days after the order is adopted. The failure to send notice by registered or certified mail shall not invalidate any ordinance adopted prior to January 1, 1989.
The provisions of this subsection regarding division of right- of-way in street or alley closings may be altered as to a particular street or alley closing by the assent of all property owners taking title to a closed street or alley by the filing of a plat which shows the street or alley closing and the portion of the closed street or alley to be taken by each such owner. The plat shall be signed by each property owner who, under this section, has an ownership right in the closed street or alley.
N.C. Gen. Stat. § 160A-299