On the website, they are listed as an LLC and the their mailing address is a house that is now for sale as a short sale. 

On the website, they are listed as an LLC and the their mailing address is a house that is now for sale as a short sale.

If this has been asked and addressed before, I apologize, please point me in that direction!

You can see exactly where any address is in Harris County in relation to flood zones.

I would also be concerned about the friend's statement that the demand is high "this year".

The concern here is I try to keep my hassle free pay on time tenants.

Well, it’s your responsibility to have valid address on file.

The neighbors also report that the tenants are "really wild" (a neighbor's son hung out with them) and "stepped right off the Jerry Springer show," and they can't imagine these people will stick around for that long.I am concerned that the proper background checks were not done - am I within my rights to ask to see the paperwork for these checks that they claimed they do on all tenants?

@Elizabeth Goff send me a PM with the property address. 

I recommend you visit this site - https://www.hopb.co/nevada/ - and do a little research into what Nevada statutes say/define "reasonable" where fees like what you are being assessed are concerned.