(a) The user rights of the court and the county are based on the proportional allocation of exclusive use facilities within the building for the court and for the county as specified in the agreement, regardless of the entity holding title to the building.
(b) The court and the county shall each have exclusive use of the facilities in the building currently used by it, together with the shared use of the common areas, indefinitely and at no cost, subject to the terms of any lease with a third-party lessor.