Abstract: A prefabricated building panel for applying a stone facing to a building wall which utilizes a metal structural frame having a sloped base plate which drains water from behind a plurality of stone panels whose front surfaces form the stone facing and are attached to the structural frame by unitary anchor rods. The lower stone panels on the structural frame have weep holes aligned with the base plate to drain the water. The unitary anchor rods include two anchor pins which are inserted in, and glued to, depressed bores on the rear side of the stone panels, thereby joining the adjacent stone panels together.