Whenever in the judgment of the Authority it shall appear that repairs are necessary upon any such wharves, warehouses or terminal facilities or that any additions, improvements or enlargements in such wharves, warehouses or terminal facilities or any change in the mode of operating and constructing such business is reasonable and expedient in order to promote the security, convenience and accommodation of the public or to provide facilities required by the business offering at the port of Charleston, the Authority shall give information in writing to the owners or operators of such wharves, warehouses and terminal facilities of the improvements, changes, enlargements and betterments which it judges to be proper and if the owners or operators of such wharves, warehouses and terminal facilities shall fail within sixty days to adopt the suggestion of the Authority, the Authority shall take such legal proceedings as it may deem expedient.