In my market, I only have one vendor qualified for appliance warranty work, and the warranty companies paid him half his standard fee for each service call. 

You can contact some local property managers and get a better idea of the rental market.

My units are rented but one tenant is month to month and under market.

Find someone who's doing what it is you want to do in the market you want to do it in and bring them value to learn.

Attractive digital marketing fliers, 3d tours, professional tours, rent specials, and competitive pricing all help too!

In fact, given current boom in Stock market, one is way better off investing there.

After two years, if everything is going well, I might explore the BRRRR method.For now, I’m focusing on the Austin market, but I’m open to exploring other markets in the future.

My lawyer suggests in a situation like this that I give them a notice that I am the new owner and that as of a certain date they owe market rent of $X,XXX.

Lexington is a weird market with low occupancy, 90-92%, and there aren't many assets in the market.

@Jim LynchSome typical minimum tenant screening requirements look like the following, but it depends on your market:-Renter has a gross monthly income of 3x more than the monthly rent-Minimum credit score of 650-Renter must have no prior evictions-No felons (or other notable criminal history)There are a number of different tenant screening softwares out there such as Zillow Rental Manager, TransUnion SmartMove, etc.Be sure to complete an employment verification by contacting the renter's employer and confirm the details they shared with you, landlord verification (if they have a previous landlord), credit check, and background check.