The board of trustees organized under the chapter to which this is a supplement may sell or dispose of any real estate or right or interest therein not needed for public use. All sales or disposition, except as hereinafter provided, shall be by public sale to the highest bidder, after public advertisement at least once a week for four weeks prior to the sale, in a newspaper circulating in the county.
The board of trustees may transfer title without public advertisement, to any real estate or any right or interest therein not needed for public use by the board, to the county for which said board of trustees was constituted.