N.C. Gen. Stat. § 160A-239.7
A city may act directly, through one or more contracts with other public agencies, through one or more contracts with private agencies, or by any combination thereof to implement the project funded in whole or in part by the imposition of an assessment imposed under this Article. Initial funding for the project may be provided by the public or private agencies. If no more than twenty-five percent (25%) of the estimated cost of a project is to be funded from the proceeds of general obligation bonds or general revenue, excluding assessments imposed pursuant to this Article, a private agency that enters into a contract with a city for the implementation of all or part of the project is subject to the provisions of Article 8 of Chapter 143 of the General Statutes only to the extent specified in the contract. In the event any contract relating to construction a substantial portion of which is to be performed on publicly owned property is excluded from the provisions of Article 8 of Chapter 143, the city or any trustee or fiduciary responsible for disbursing funds shall obtain certification acceptable to the city in the amount due for work done or materials supplied for which payment will be paid from such disbursement. If the city or any trustee or fiduciary responsible for disbursing funds receives notice of a claim from any person who would be entitled to a mechanic's or materialman's lien but for the fact that the claim relates to work performed on or supplies provided to publicly owned property, then either no disbursement of funds may be made until the city, trustee, or fiduciary receives satisfactory proof of resolution of the claim or funds in the amount of the claim shall be set aside for payment thereof upon resolution of the claim.
N.C. Gen. Stat. § 160A-239.7