  We give a detailed renormalization group analysis for the SU(16) grandunified
group with general breaking chains in which quarks and leptons transform
separately at intermediate energies. Our analysis includes the effects of Higgs
bosons. We show that the grandunification scale could be as low as $\sim
10^{8.5}$ GeV and give examples where new physics could exist at relatively low
energy ($\sim 250$ GeV). We consider proton decay in this model and show that
it is consistent with a low grandunification scale. We also discuss the
possible generation of a neutrino magnetic moment in the range of $10^{-11}$ to
$10^{-10}\mu_B$ with a very small mass by the breaking of the embedded
SU(2)$_\nu$ symmetry at a low energy.
