If an agricultural high school has established or hereafter establishes facilities for the industrial training of students and it appears to the board of trustees that the training of students will be facilitated by the continuous operation of such facilities, the trustees are authorized to lease to individual firms or corporations such facilities or a part thereof upon such terms and conditions as the trustees may approve, provided that all students desirous of securing training of the kind offered by the lessee shall be given a reasonable opportunity therefor.