  A new heavy $Z'$ vector boson provides a possible explanation for the neutral
current B anomalies and points to the scale where we expect the solution to the
hierarchy problem to appear. In this paper, we explore a modified Top Seesaw
model based on the global symmetry breaking of $U(3)_L$ to $U(2)_L$. The
symmetry is partially gauged such that the breaking introduces not only a
composite Higgs doublet but also a TeV-scale $Z'$ boson. The $U(3)_L/U(2)_L$
Top Seesaw model predicts a light Higgs boson as well as a large top Yukawa
coupling. Additional $U(1)'$ symmetry is gauged such that a flavorful TeV-scale
$Z'$ boson is introduced to address the B anomalies. The existence of a heavy
vector-like top quark and $Z-Z'$ mixing breaks the custodial symmetry, which
predicts a heavier $W$ mass as observed by the CDF collaboration. Two possible
candidates for the $U(1)'$ symmetry corresponding to the $Z'$ boson, $U(1)_L$
and $U(1)_{L-R}$, are discussed in detail. The parameter space for the models
to address both anomalies is presented. The direct searches of the $Z'$ boson
from dilepton channels are also studied. Based on the assumptions, a TeV-scale
$Z'$ boson is still viable and can be probed in the near future.
