The county government shall have full and complete jurisdiction and control over the Courthouse and Courthouse Annex of Sussex County and over all personal property and equipment used in connection with the property committed to its jurisdiction; and, in this connection, the county government shall have and assume all of the jurisdiction, powers and duties heretofore exercised by or vested in the Board of Trustees pertaining to said buildings.
All contracts and engagements for the erection or repair of said buildings or for the purchase of equipment and supplies, where the probable amount shall be in excess of $5,000, shall be submitted to public bidding after due advertising and shall be awarded to the lowest responsible bidder, unless for reasons deemed expedient by the county government.