@Joseph Lewis I'm born and raised in Detroit and have also lived in DC for a few years. To say that Detroit is similar to DC 6-7 years ago is not far off, but like others have said, DC has the ability to pump money into infrastructure in the name of increased government, etc..
Detroit is definitely coming back in a slow and steady pace. The 7.2 CBD being rehabbed and brought back online by billionaires such as Dan Gilbert and crew have been the first part in repairing 50 years of neglect and decline. Certain neighborhoods are starting to see private equity come in to help turn them around; Grandmont/Rosedale, Bagley, East English Village, Corktown, etc. University of Michigan has partnered with the city to find a way to improve the poor state of education.
The main issues that Detroit needs to fix before middle class families decide to move back is the education system and insurance rates. Good public schools need to get brought back online and insurance rates need to drop drastically. The blatant red-lining from insurance companies is insane and a HUGE reason why people don't change their residency to Detroit even when they move here. I still use my relatives address in the suburbs to save $100+/mo in insurance, as do many many others -- this is why the population is still "declining" though thousands of new units have come back online and tons of people live downtown again.
Long story short, do your research on the neighborhoods you want to invest in, talk to people that actually live and invest here. Don't watch mass media news to get your stories about the City. I'd be happy to chat some time if you want to learn more.
Good luck!