We consider models built on $AdS_5otimes S^5/Gamma$ orbifold compactifications of the type $IIB$ superstring, where $Gamma$ is the abelian group $Z_n$. An attractive three family $mathcal{N}=0$ SUSY model is found for $n=7$ that is a modified Pati--S
alam Model which reduced to the Standard Model after symmetry breaking.
