N.C. Gen. Stat. § 160A-620

The property of the Authority, both real and personal, its acts, activities and income shall be exempt from any tax or tax obligation; in the event of any lease of Authority property, or other arrangement which amounts to a leasehold interest, to a private party, this exemption shall not apply to the value of such leasehold interest nor shall it apply to the income of the lessee. Otherwise, however, for the purpose of taxation, when property of the Authority is leased to private parties solely for the purpose of the Authority, the acts and activities of the lessee shall be considered as the acts and activities of the Authority and the exemption. The interest on bonds or obligations issued by the Authority shall be exempt from State taxes.