The new section is called Section 1070 to house violators of the new illegal immigration law, SB 1070.
Section 1070 is able to hold up to 100 inmates, but reportedly has room to grow if needed.
Sheriff Arpaio said he wants to assure citizens of Maricopa County that there will always be room for violators of the new law.
Tent City currently has about 200 inmates with immigration or agency holds against them.
They are already housed separately for easy management.