1: The switch console of this tower is located in the small room to the east. Next, you have to enter the nearby vehicle and drive it inside the carrier. Hack the carrier so it rises up then drive the vehicle through the fence. You can now freely unlock the ctOS Tower.
2: This tower is located on a room on the upper floor of the yard warehouse. There are two console switches you need to unlock before you can access the tower. First, you have to hack the camera installed on the silos north of the warehouse. From there, switch to the camera inside the upper floor to unlock the switch console.
After unlocking the first switch console, change your view to the silo camera you hacked first, then this time, hack the camera outside the room to the left. Pan to the right to find the second switch console. Unlock it and you’re good to go.
To reach it, you have to find the lift east of where the tower marker is located in your map. From there, you’re free to unlock the ctOS tower.
3: For the last tower in this district, head south of the map marker and hack the camera installed in the corner of the building to the south. From there, look inside the garage ahead to unlock the switch console. Head inside the garage then vault over the fence then ride the lift to reach the upper floor.