Abstract: Disclosed is a bracket for supporting a mason's guide line in place adjacent an existing courses of bricks that form intersecting walls. The bracket includes a base portion defining planar inner surfaces for engaging a pair of wall faces adjacent a corner and a retaining line, of adjustable length, secured to the base and including a spring portion. The retaining line is suitable for engaging a fixed structure (e.g., a similar line of another bracket) remote from the corner to retain the bracket in place through friction resulting from the essentially horizontal force applied to the base by the retaining line. The base also includes a pair of position indicators for determining the orientation of the planar inner faces of the bracket with respect to the vertical. A guide line support is secured to the base and projects therefrom in a direction parallel to the line of intersection of the two planes defined by the base.