  The presence of new matter fields charged under the Standard Model gauge
group at intermediate scales below the Grand Unification scale modifies the
renormalization group evolution of the gauge couplings. This can in turn
significantly change the running of the Minimal Supersymmetric Standard Model
parameters, in particular the gaugino and the scalar masses. In the absence of
new large Yukawa couplings we can parameterise all the intermediate scale
models in terms of only two parameters controlling the size of the unified
gauge coupling. As a consequence of the modified running, the low energy
spectrum can be strongly affected with interesting phenomenological
consequences. In particular, we show that scalar over gaugino mass ratios tend
to increase and the regions of the parameter space with neutralino Dark Matter
compatible with cosmological observations get drastically modified. Moreover,
we discuss some observables that can be used to test the intermediate scale
physics at the LHC in a wide class of models.
