There will be a lot of proven people here who demonstrate that you can totally self manage an out of state property.It really will depend on you, the market, the property, and a few other factors some of which may be out of your control.I would not look at PM strictly as a cost, there are a lot of good local PM's who can add value to your property. 

Take a look at this video from kwikset, demonstrating how difficult/impossible it is for veteran locksmiths to enter:  https://www.youtube.com/watch?

If they are here legally, they can provide the necessary documentation to demonstrate that and I can run my background check.

This approach is not only disrespectful but also demonstrates poor judgment.

You can send thank you cards and tip during the holidays to demonstrate that you value the relationship, etc. 

Employers had to demonstrate they had advertised positions locally and in the US in general, before they could make an offer to a foreigner.

I've still to meet anyone in 25 years that was able to demonstrate to me that they actually avoided liability not otherwise covered by adequate liability insurance.

Just make sure you get it removed when you've demonstrated your company to be credit worthy.

Are there examples or case studies that demonstrate how property tax hikes have influenced the housing market? 

I have actually had a judge say to a defendant, "All the evidence presented demonstrates that you are, in fact, guilty.