Prevents the City of Southport from exercising its powers under GS Chapter 160D, or its predecessor, beyond its contiguous corporate limits. Effective July 1, 2024, relinquishes the city's jurisdiction over an area it is regulating under GS 160D-202 (extraterritorial jurisdiction). Once jurisdiction is relinquished, specifies that the city's regulations and powers of enforcement remain in effect until (1) Brunswick County has adopted the regulation or (2) 60 days have passed, whichever is sooner. Allows for Brunswick County to take measures consistent with GS 160D-204 (pending jurisdiction) that may be required to adopt and apply its development regulations for the area at the time it assumes jurisdiction. Specifies that any person who has vested rights in the City of Southport may exercise those rights as if no change of jurisdiction has occurred. Allows Brunswick County to take action pertaining to development that could have been taken by the City of Southport. Specifies that otherwise, any other land use in Brunswick County where the County has acquired jurisdiction is subject to the county's development regulations.