Abstract: A wall structure system may utilize precast concrete columns and panels. Each concrete column may be secured to an in-situ concrete footing by a threaded anchor bolt imbedded in the footing. The column may be positioned onto the footing so that the exposed threaded rod extends through a cylindrical opening in the bottom of the column. A washer and threaded nut may be installed on the threaded rod and secured through an access port in the side of the concrete column. Wall panels may be installed by sliding them into vertical slots in the columns, thereby concealing locations of the access ports.