A pawn shop is a good place to make a base due to the tools and items that can help a survivor. However, depending how long it has been since the apocalypse began to the day a survivor finds a pawn shop, most of the equipment could already have been taken by other survivors. Nonetheless, the pawn shop will not have been looted if you are lucky, but it still has to be barricaded well. If other survivors arrive after the pawn shop is turned into a base for other survivors, they may try to invade.
A pawn shop will have equipment for survivors to use.
In the early stages of the apocalypse, there could be, although very unlikely, food inside.
A pawn shop may have been looted if other survivors have already broken into the pawn shop and taken the equipment.
Most pawn shops have only one floor, and thus escaping from zombies becomes really hard.
Pawn shops often have a wall made almost entirely from windows, thus making them very easy for the undead to break in.