Brush Park (immediately north of the 'downtown' area) used to be the home base for Detroit's rich and famous. White Flight, racism and the like drove the owners out, and the homes have been decaying for decades. Squatters and thieves have taken much of what is left, too.
However, the area is making somewhat of a comeback, with many of the old mansions being renovated. Some gentrification is occuring, but generally, the neighborhood is working fairly well.
(This, by the way, is exactly 2 blocks from my home.)
Photo by Bobby Alcott, Detroit - USA.