It can also depend on when the mall was built and that it could be grandfathered. I think until the 1980s, malls were typically built without fire alarm systems. But many of them since had alarm systems installed either between the 1980s or the present to meet with the current codes. Of course, new malls being built will have fire alarm systems. The Galleria Mall in Taunton, MA has always had its Simplex 4100 system since it was originally built in 1991-1992 (non voice-evac systen; it has -9838 horns on 4903-9101 strobe plates in the main mall areas, food court and at least one store, while other stores with alarm signals have TrueAlerts)