7-16-4223. Leasing of municipal land for nonpark purposes. The board of park commissioners shall have the power and be charged with the duty to lease all lands owned by the city heretofore acquired for parks, whether within or without the city, which, in the judgment of the board, it shall not be advisable to improve as parks, upon such terms and conditions as the board shall deem to be for the best interests of the city. Such lands shall not be leased for a longer term at any one time than 5 years and not for a longer time than 1 year without the concurrence of two-thirds of the entire board of park commissioners.