Arasaka Seaside was also located in the Watson District; back when the Unified War reached California, the mayor Ryan invited them over.
Since then, this area had been practically occupied by Arasaka soldiers, becoming their base of operations.
The buildings here were constructed following the standards of urban military architecture; the NCPD explicitly had no jurisdiction here. Once you crossed into the Watson District, you were surrounded by Arasaka's unmanned mecha, drones, and fully armed soldiers.
Lille covertly assisted Kaneke in jamming the surveillance and tracking equipment on the floating car, but the area around Arasaka Seaside was a complete no-fly zone.
Would Arasaka allow a trauma team's floating car to pass?
They might think someone needed rescue; that could be Kaneke's plan, but the chances that Arasaka would just let him waltz in were slim.