Section 3. That It Shall Be Lawful for, and the Right Is Hereby

conferred upon, the cities of this Commonwealth to resell such neighboring property, with such restrictions in the deeds of resale in regard to the use thereof as will fully insure the protection of such public parks, parkways, and playgrounds, their environs, the preservation of the view, appearance, light, air, health and usefulness thereof, whenever the councils thereof shall, by ordinance or joint resolution, determine thereon.