  We prove that, a suitable correlation between the system parameters can
trigger topological phase transition and flat bands in a multi strand Creutz
ladder network, when a staggered second neighbor interaction is included along
the x axis. An appropriate change of basis maps such a finite N strand mesh
into N or N 1 decoupled Su Schrieffer Heeger chains, depending onNeven or odd.
A simple intuitive method, using a real space decimation scheme turns out to be
very powerful in analytically extracting the flat bands, explaining their
degeneracy or a lifting of the same. Our results are analytically exact, and
may inspire experiments in photonics and ultracold atomic systems.
