All lands necessary for the use of the state hospitals specified in Section 4100, except those acquired by gift, devise, or purchase, shall be acquired by condemnation as lands for other public uses are acquired.

The terms of every purchase shall be approved by the State Department of State Hospitals. No public street or road for railway or other purposes, except for hospital use, shall be opened through the lands of any state hospital, unless the Legislature by special enactment consents thereto.