The fight to take over Paramount district (District Showdown) will be possible only after D.U.P. forces control less than 30% of a district. Go to the place marked with a phone icon (large billboard on the rooftop) and make a call.
After the battle begins watch out for elite soldiers with supernatural powers. But this is not the only threat because there are also snipers here - you should eliminate them as soon as possible. Keep fighting until the base is secured.
Rewards for taking over Paramount to:
- Unlocking fast travel
- Getting rid of all D.U.P. soldiers in the area
- Unlocking Delsin's unique clothes - The Crocodile