This will impact last-minute demand for rentals though as many people will choose to not attend, I am concerned our houses that are not yet booked won't get booked, or will get booked at way below usual rates.

Ridiculous from my perspective.My properties are in NJ, but my mortgagee is in MI.I'm under the impression, a mortgagee can legally only demand the mortgage amount is reflected in the coverage. 

In no particular order I have listed some of the most popular markets for out of state investorsCincinnati, OhioDayton, OhioToledo, OhioYoungstown, OhioCincinnati, OhioMemphis, TennesseeSaint Louis, MissouriIndianapolis, IndianaDetroit, MichiganErie, PennsylvaniaLouisville, KentuckyMilwaukee, WisconsinJackson, MississippiEach of these markets is popular with turnkey investors because of the low barrier to entry, high rental demand & high rent to price ratio.

I know for sure they have average DOM for all zip codes and I've seen them give a snapshot of turnover by city before, but not 100% they have that info on demand.

Secondly, tenants can make wild claims about their labor and demand pay.

I think it boils down to supply / demand for housing but, nevertheless, I'm sure there is a lower limit on what return investors will accept.

While broader economic conditions might point to a flattening or slowing in national demand, we're just not seeing that here in Metro Orlando.

I'd recommend connecting with others in your market - investors (new and experienced), lenders, Realtors, friends/family who are on the same page as you, etc.This way, you can supplement your research findings with what others know.

Our model is to find urban buildings with unmet self storage demand, and bring them back to life. 

One thing remains true - there's strong rental demand across the classes so long as you're in a location that is suitable for renting.