If any portions of the right-of-way accepted under section 37-912 or 37-914 are not immediately developed as a state recreational trail or for habitat, the Game and Parks Commission shall use its best efforts to lease undeveloped portions of the right-of-way, with first priority to adjacent landowners, for the purposes stated in section 37-912 or 37-914 or for other purposes which are not inconsistent with the purposes of section 37-912 or 37-914 until such time as a state recreational trail or habitat may be developed. Any lease or use allowed shall be subject to all prescriptions of the National Trails System Act.