A plurality of utility distribution system elements such as cables, wires, pipes or ducts are supported in the space existing between a suspended ceiling and the upper adjacent floor by a plurality of support brackets. The support brackets include elements having a shape corresponding generally to an inverted L which are secured to the undersurface of the upper adjacent floor and thereby provide downwardly extending vertical elements. A plurality of slots are formed in the support brackets and a plurality of elongated straps are securable to the support brackets using the slots and bending tabs formed in the straps. The straps cooperate with the support bracket to secure various utility distribution system elements such as pipes, cables, wire bundles or ducts. In an alternate embodiment, the support brackets are arranged in pairs and are joined by horizontally extending braces therebetween to form ladder-like support structures which receive and support various utility distribution elements.