Laws may be enacted, and any city or county operating under a constitutional charter may enact ordinances, providing for the clearance, replanning, reconstruction, redevelopment and rehabilitation of blighted, substandard or insanitary areas, and for recreational and other facilities incidental or appurtenant thereto, and for taking or permitting the taking, by eminent domain, of property for such purposes, and when so taken the fee simple title to the property shall vest in the owner, who may sell or otherwise dispose of the property subject to such restrictions as may be deemed in the public interest.