Where is the city centre of Tyler?
I started around where Google placed the "Tyler, Texas" sign but the area looked like some rundown neighbourhoods that you could expect to find at the far edges of a big city.
South Tyler is generally considered to be somewhat nicer than the downtown area (which is further north). For instance, one of the nicer neighborhoods in Tyler is Holytree, which is off of Grande near its intersection with South Broadway. There are also some nice areas around the southern parts of Paluxy, which runs roughly parallel to Broadway. A lot of the nicer areas, though, are not actually within Tyler itself, but in the surrounding suburbs.
As it turns out, pretty close to the "tyler, tx" search marker. The marker itself (Broadway and Ferguson) doesn't seem to me like a particularly run-down area.