Would it prevent me from closing on a purchase if I'm not registered in the State of Florida or the county?

We invest inside the loop to prevent much growth (though there is some through teardowns and what not).

Has anyone heard of the National Prevention center and how to become an affiliate?

That is the due diligence that prevents the tenant coming back later and saying, "We made a verbal agreement that I get to park my leaky motorhome over there while I use it to breed cats.

Do you guys have clauses that prevent the PM from getting a kickback or "referral fee" for the people he hires to do the maintenance work?

I added a *note at the bottom of my post in order to prevent the same thing from happening.

-Sealing all Windows: We can make sure all window storm doors are securely closed, and wrap all windows in an insulating sheet that will prevent any drafts from coming in, this might be making the unit feel colder than it is.

If it is let out of it's cage it would need to have it's wings clipped to prevent it from flying around your rental, landing (and pooping) where it sits.  

This prevents a gain deferral on those investors that like to leverage property by pulling out all the profits prior to the sale which, without this rule in place, would allow a savvy investor to pull out the gains through a refinance and avoid the taxes.If you are going to owner finance the property you are selling, there are more details than this, but best case scenario is that you have the ability to fund that all up front and you bring the seller financed amount to closing such that you are the seller and the bank essentially and then all the funds are rolled up into the exchange and held with your intermediary and utilized on the next property. 

I still don't know how I'm going to prevent half that stuff from happening but I'm going to enjoy practising as I continue to learn.