"...his apartment, north of the city's downtown area......
...three gunmen whom he knew..."
Inner city culture.
Unless things have changed a whole lot since I lived in Dallas, and they may have, Cedar Springs and these other areas are not inner city.
No, not that area. More Turtle Creek - McKinney Ave from the map. Of course, when you hear Cedar Springs, you first think of the Oak Lawn gay community, but this address looks to be south of the heart of that area.