Cities of the first class are hereby authorized and empowered to sell at public sale and convey all their right, title and interest in and to any and all real estate, acquired and held as such public landings, or any parts thereof, whenever such landings or parts thereof are not required for the purposes originally intended, subject however to such trusts as were originally charged upon such lands as public landings; and the mayor of such cities is authorized to execute the necessary deeds and other writings to carry out the purposes of this act: Provided, All such sale or sales and conveyances shall first be authorized by ordinance of council.
53 P.S. § 14211