N.C. Gen. Stat. § 160A-219

The council shall have authority to establish schedules of exemptions from assessments for corner lots when a project is undertaken along both sides of such lots. The schedules of exemptions shall be based on categories of land use (residential, commercial, industrial, or agricultural) and shall be uniform for each category. The schedule of exemptions may not provide exemption of more than seventy-five percent (75%) of the frontage of any side of a corner lot, or 150 feet, whichever is greater.