I bought the first property in Detroit the end of 2008 and Detroit at that time was already at the bottom because of many factors stretching back decades.
The nationwide housing crash was only the last of several factors and the banks had houses that they were selling with a warranty deed all taxes paid for $100-$1000 and they had 1000s of them. I had been researching properties for 1 year before I decided there was no place better than Detroit.
One of the things that amazed me was I would pull up Craigslist for Detroit and Craigslist for Long Beach California (one of the other areas I was watching) Houses that were selling full retail for $400,000 in LB CA would rent for $1400-$1500.
Houses that were selling full retail for $10,000 in Detroit would rent for $650! And there were lots of opportunities to buy for way less than retail. My first purchase was a 2 unit for $1500 rent for $900 (2x$450)
In Detroit suburbs houses that would sell full retail for $20,000 would rent for $875.
"Let me see if I buy (20) houses for $20,000 each instead of (1) for $400,000.00 which strategy will survive the downturn."