When you researched markets like Austin las Vegas Miami, those markets have higher land cost and are more cyclical in nature tend to have larger price swings compared to regions with lower land costs.

The only good use I can see of the fees are based on rent charged would be for a tenant to purchase it and charge themselves $0 or near $0 rent to avoid the rent based charges. 

Seems like it's in a lower end area so if it is filled you will have tenant issues and turnover cost.

Luckily, due to the number of items this person had at the home, we added charges for each day beyond the set closing date for them to vacate the property.

That seems like a lower demand area than any place I would ever invest.   

I would like to have lower monthly payments should I make a big lump sum payment towards my principals and ask my mortgage company to adjust it or refinance it or which one is the best ? 

I will continue to do my research and try to find a CPA that handles Texas and has a lower minimum I think.

There simply isn't enough margin in this business to layer on a national company, without charging you an arm and a leg and/or doing a substandard job.

To get started, figure out your target tenants (like traveling professionals) and check out what similar rentals in the area are charging.

I'd assume all vanities, lower cabinets, 3to 5ft of drywall and base will all need replacing.