Provided, however, a city may dispose of real property of any value and personal property valued at thirty thousand dollars ($30,000) or more for any one item or group of similar items by private negotiation and sale where (i) said real or personal property is significant for its architectural, archaeological, artistic, cultural or historical associations, or significant for its relationship to other property significant for architectural, archaeological, artistic, cultural or historical associations, or significant for its natural, scenic or open condition; and (ii) said real or personal property is to be sold to a nonprofit corporation or trust whose purposes include the preservation or conservation of real or personal properties of architectural, archaeological, artistic, cultural, historical, natural or scenic significance; and (iii) where a preservation agreement or conservation agreement as defined in G.S. 121-35 is placed in the deed conveying said property from the city to the nonprofit corporation or trust. Said nonprofit corporation or trust shall only dispose of or use said real or personal property subject to covenants or other legally binding restrictions which will promote the preservation or conservation of the property, and, where appropriate, secure rights of public access.
N.C. Gen. Stat. § 160A-266