1. Apparatus for supporting a plurality of hanging structures from a building wall, comprising an elongated body having a front wall, rear wall, first and second end walls, and top and bottom walls, a plurality of first track means extending the full length of said bottom wall in generally parallel relationship with each other and said front wall, a plurality of spacer means disposed between at least one of said first track means and said bottom wall of said body so that said one of said first track means is maintained in spaced relationship to said bottom walls of said body, second track means disposed along the full length of said front wall, third track means detachably mounted on each of said first and second end walls of said body, each of said third track means being substantially coplanar with said second track means, a plurality of bracket means for supporting said elongated body on the building wall, said bracket means having one leg engaging the wall and a second leg extending substantially perpendicular to said first leg and disposed between said one of said plurality of said first track means and said bottom wall of said body, whereby said spacer means permit said body to be supported on said second leg of said mounting bracket means without interfering with said first track means.