Median household income can be an indication of the area.It's not feasible to manage D-class remotely or with 3rd party management and make a profit.

I work for a property management company in Milwaukee, a very hot rental market currently.

@Brian Jackson @Becca F.Kansas City is definitely a hot spot for rental properties!

This helps keep me out of hot water with fairhousing. 

Orlando, Kissimmee, and Lakeland are hot for mid-to-long-term rentals, with Orlando's tourism and Lakeland’s logistics expansion driving demand.

Properties with no pool definitely suffer through the hot summer months.

The mayor has been hot on out of state investors and poor property managers since his campaign. 

One unit has a pool and hot tub.

Most owners are local and therefore “hot” money or out of area players are not yet chasing Pittsburgh assets, keeping prices favorable.References United States Census Bureauhttp://www.cmu.edu/news/stories/archives/2017/august/economic-impact-report.htmlMarcus & Millichap 2017 Multifamily Investment Forecast2017 Commercial Real Estate Trends Report by Integra Realty Resourceshttp://www.pittsburghmagazine.com/Pittsburgh-Magazine/September-2017/Staying-CMU-All-Eyes-on-Carnegie-Mellons-Future/http://www.nextpittsburgh.com/features/pittsburgh-developments-watch-2017/

I think the median household income is like 68k.