If a county agricultural society desires to sell its site in order to purchase another, or if for any reason such site is unfit or insufficient for the purposes for which it is used, and if at a regular meeting of such society’s board of directors, by a vote, upon a call of the yeas and nays, of at least a majority of all the members of such board, it adopts a resolution for the purpose of securing the benefits of this section, and in such resolution declares that it desires to sell such site in order to buy another, or that the site has become unfit or insufficient, and that it is for the best interests of the society and the county that such site be sold or leased and a new one bought or leased, then the society may sell or lease such old site and buy or lease a new one for holding county fairs; but in cases where the county paid all or any portion of the purchase money for the site to be sold or leased, the written consent of the board of county commissioners shall first be given to such sale or lease. Within thirty days after the adoption of such resolution, such board of directors shall give notice in writing to the board of county commissioners of such county of the adoption of such resolution declaring the necessity of selling or leasing such site and of buying or leasing a new site, which notice shall contain or have annexed to it a certified copy of the resolution, signed by the president and the secretary of such board of directors.