(a) An agency may agree or contract with another agency for the provision of necessary and authorized services and resources.
(b) An agency may not construct a highway, road, building, or other structure for another agency under this chapter, except that the Texas Department of Transportation may enter into an interagency agreement with a state college, university, or public junior college for the maintenance, improvement, relocation, or extension of existing on-campus streets, parking lots, and access-ways.

(c) An agency may not provide services or resources to another agency that are required by Article XVI, § 21, of the Texas Constitution to be provided under a contract awarded to the lowest responsible bidder.