The state road commissioner may acquire private or public property rights or any interests in lands for controlled-access facilities and service roads, including existing and vested rights of access, air, view and light, by grant, gift, devise, purchase or condemnation in the same manner as the commissioner is now or may hereafter be authorized by law to acquire such property or property rights in connection with the highways of the state road system. In connection with the acquisition of such property or property rights for any controlled-access facility or portion thereof, or service road in connection therewith, the commissioner may, in his discretion, acquire an entire lot, block, or tract of land, if by so doing, the interests of the public will best be served even though said entire lot, block, or tract is not immediately needed for the right of way proper.