Abstract: An outer wall comprises a load-carrying steel skeleton comprising a plurality of upright steel columns of square horizontal cross section and having a lower end anchored to a foundation, and an upper steel beam connecting the upper ends of the columns. A vertical bracket is mounted on each column. The bracket is of I-shaped horizontal cross section and defines between its outer and inner flanges two oppositely facing vertical guide channels extending parallel to the columns, two edge portions extending inwardly from the inner flange at an angle thereto, the inner flange and the two edge portions thereof fitting the cross section of the column. A plurality of vertical wall panels are aligned in a plane parallel to the columns and have edges slidingly received and engaged in the vertical guide channels.