  We analyze the phenomenology of the Higgs sector in a 5D model compactified
on an $S_1/Z_2$ orbifold where the compactification scale $M_C$ is around the
TeV scale. We show that the conventional MSSM Higgs boson mass bounds in 4D can
be violated when we allow the gauge sector, Higgs and third family multiplets
to live in the fifth extra dimension. Supersymmetry is broken at an orbifold
fixed point which is spatially separated from the Yukawa brane where two chiral
families are localized. When the brane-localized supersymmetry breaking term
for the stop sector is arbitrarily large, we find that the stop KK-mode mass
spectrum is completely independent of the Higgs fields. Hence, the Higgs masses
only receive radiative contributions from the top KK-modes. The 1-loop
effective potential is insensitive to the cutoff scale of the theory and yields
a negative Higgs squared-mass contribution that triggers electroweak symmetry
breaking in the range $1.5\simlt\tan\beta\simlt 20$, where bottom/sbottom loop
effects can be ignored. The recent LEP Higgs bound at $m_{h^{0}} > 114.1$ GeV,
in conjunction with naturalness arguments, allows us to bracket the
compactification scale $1.5 \simlt M_{C} \simlt 4$ TeV. Within this parameter
space, we find that the lightest Higgs boson mass has an upper bound $m_{h^{0}}
\simlt 160$ GeV with the magnitude of the $\mu$-parameter restricted to the
range $33 \simlt | \mu | \simlt 347$ GeV.
