The Black Market was a location used by The Volk if Natalya "White Fox" Gryzunova isn't at the Observatory. It is mostly a location where Riots happen at this shopping center, Maxims Arch is close to this location, in Crackdown 2, just like Maxims, it was replaced with something else.
Gameplay[]
From the Maxims Arch Supply Point, leap to the adjacent building to the west. From this rooftop, you'll have perfect view of the battleground below and should be able to spot Gryzunova and her kin below. We recommend killing the soldiers on the nearby rooftops first (especially the sniper to the north), then focus on her bodyguards below. Duck behind the roof's rim for cover to regain health. Furthermore, Gryzunova is equipped with a rocket launcher and a direct hit can take you down - get out of the way as soon as spot her launching one. Once most of her fellow mates are destroyed, jump into the center of the shopping arena and take her down face to face. Shoot her arm or use your melee attacks to prevent her from launching any more rockets, and stay on the move constantly to avoid a rocket if she manages to squeeze one off. If she does hide, focus on killing her bodyguards instead to make it easier to kill her later.
Alternative[]
If you're feeling daring, you should be able to wrap this up quite quickly. Once you land on the rooftop, just shoot at her as quickly as you can. If you're swift, you can destroy her before she can take cover - just watch your health since the surrounding gang members can be devastating.