I would need to look into legalities but I would want assurance that the terms were clear. 

I'm sure it's nerve-wracking, but I'm just as sure that where there is a will, there is a way. 

This assures our properties fill up fast.

If not, what assures you that the rent will not dive so low that you are no longer cash flowing?

My  home was built in 1927 and I can absolutely assure you that it is an "A plus" neighborhood!

I assure my tenants that want a long term lease that it will be renewed for another 12 year term annually, therefore if they honor the terms of the lease, they can stay as long as they want.

, and assure them that there will be no surprises. 

To set-up for payment processing on your own and pass PCI and/or ACH requirements can be expensive (development, audit and assurance) and, as @Jimmy Moncrief warned, the liability is almost certain to outweigh the benefit of brand control.For a small operation, I would recommend you find a storefront hosting provider or payment gateway and simply throw the session to it from your website.

Again, if you have never had a bad experience with police then that is awesome, but I assure you many of us out there have had very bad experiences with law enforcement in many situations and circumstances. 

She assures me her father would pay $600 leaving them to pay the remaining balance (I'm asking $950 for rent plus $25/per pet/per month) They have 2 pets so rent comes out to $1K/month.