Good points.I'd add square, level, plumb - license, insurance, bond - using permits to follow codepointing out problems the owner doesn't realize they have that are serious. 

I've used Propstream, Red X and Real Estate skip trace with varying levels of information accuracy.

The answer to this will come down to comfort level, funds available, and strategy you are looking to implement. 

There are several out there that I am aware of that are taxed at rates which are currently lower than ordinary income rates. 

I invest primarily in a lower cost area but also own property in, and am looking in, a higher cost area.

Just the different brand name lowers the cost dramatically!

If you do have to move because of a job, you would be safest (in my opinion, i am not giving legal advice or financial advice), i would sell that property to ensure that you did not just purchase with the goal of moving out early and taking advantage of lower rates and lower down payments for purchasing your home as a primary residence. 

Sales Tax Breaks: Construction materials and services may be subject to lower tribal sales taxes—or exempt altogether.4.

Appraisers are using MLS data and often it is lower than actual rents. 

Than AFTER that base-line cleanup action is done which part of it is to establish access for all others, than things get into the next lower level of details.