Excess condemnation

Any agency of the state or any city, town, village, or public corporation, which is empowered by law to take private property by eminent domain for any of the public purposes specified in section one of this article, may be empowered by the legislature to take property necessary for any such purpose but in excess of that required for public use after such purpose shall have been accomplished; and to improve and utilize such excess, wholly or partly for any other public purpose, or to lease or sell such excess with restrictions to preserve and protect such improvement or improvements.