The design consists of the features of shape of the building member shown in the drawings.Drawings of the design are included:Figure 1 is a right hand side perspective view of a first variant of a building member showing the design, the left hand side perspective view being a mirror image thereof;Figure 2 is a right end view of the building member of Figure 1, the left end view being the same as the right end view;Figure 3 is a front view of the building member of Figure 1, the rear view being the same as the front view;Figure 4 is a top plan view of the building member of Figure 1, the bottom plan view being the same as the top plan view;Figure 5 is a right hand side perspective view of a second variant of a building member showing the design, the left hand side perspective view being a mirror image thereof;Figure 6 is a right end view of the building member of Figure 5, the left end view being the same as the right end view;Figure 7 is a top plan view of the building member of Figure 5, the bottom plan view being the same as the top plan view;Figure 8 is a front view of the building member of FIgure 5, the rear view being the same as the front view;Figure 9 is a right hand side perspective view of a third variant of a building member showing the design, the left hand side perspective view being a mirror image thereof;Figure 10 is a right end view of the building member of Figure 9, the left end view being the same as the right end view;Figure 11 is a top plan view of the building member of Figure 9, the bottom plan view being the same as the top plan view;Figure 12 is a front view of the building member of Figure 9, the rear view being the same as the front view;Figure 13 is a right hand side perspective view of a fourth variant of a building member showing the design, the left hand side perspective view being a mirror image thereof;Figure 14 is a right end view of the building member of Figure 13, the left end view being the same as the right end view;Figure 15 is a top plan view of the building member of Figure 13, the bottom plan view being the same as the top plan view; andFigure 16 is a front view of the building member of Figure 13, the rear view being the same as the front view.