  In a previous paper, referred to as a "Mini-Landscape" search, we explored a
"fertile patch" of the heterotic landscape based on a Z6-II orbifold with
SO(10) and E6 local GUT structures. In the present paper we extend this
analysis. We find many models with the minimal supersymmetric standard model
spectra and an exact R parity. In all of these models, the vector-like exotics
decouple along D flat directions. We present two "benchmark" models which
satisfy many of the constraints of a realistic supersymmetric model, including
non-trivial Yukawa matrices for 3 families of quarks and leptons and Majorana
neutrino masses for right-handed neutrinos with non-trivial See-Saw masses for
the 3 light neutrinos. In an appendix we comment on the important issue of
string selection rules and in particular the so-called "gamma-rule".
