(a) General rule.--The county commissioners may purchase or accept by gift any building authorized by law deemed suitable and proper by the county commissioners for use as a county building.
(b) Construction or alteration.--The county commissioners may provide for the construction or alteration, including enlargement of any county building. If the county commissioners undertake any construction or alteration, the county commissioners shall prepare plans and specifications for the construction or alteration. The county commissioners shall secure bids and provide for the formation of contracts necessary for the construction or alteration according to this act.