Chapter 36- Scorched Earth

[UndeadSweeper]

Very good call. When they sent Kalani, they did not know the exact location of CJ's Tower; but since then a lot of time has passed. Maybe they had the chance to get information. But this is kind of a wild card-solution.
More likely would it be that Scratch and guys accidentaly stumble over a safe-house anywhere in the place.
And the likelihood rises if 'we' consider The Mall, actually, or any other deserted place as the new hideout of Scratch and gang.

About booby-trap: I give it a 100% chance. Back then CJ was still in full control of her mind.

The only person we should be worry about know the locate is Pinstripe. He been there before.

The Mallers find it is highly unlikely and not like Durbar is a fully operationally battle-station. Even so by the time CJ get near enough to her building I believe she noticed "it's trap" before they step to the building.