The electronic structure of F.C.C. transition metal small cubo-octahedral clusters of increasing size up to 1 289 atoms is described by means of local densities of states (LDS) on various crystal sites in the framework of the tight binding approximation associated with the moment method. The general trends of the LDS are governed by the nearest neighbour shells, as appears when comparing with calculations at the protruding edge of stepped surfaces having the same local environment, and with bulk results. But some outstanding details are strongly dependent on more distant shells. Cohesive energy is calculated in terms of band filling for different cluster sizes and shows to converge quickly to that of the bulk