They would supply their furniture for little to no cost and they could set displays on the furniture from whom supplied it, we like to use the word "showcase" b/c it grabs their attention immediately.

It's quite different when a tenant without a pet brings one into the picture; you have no way to evaluate the behavior beforehand.

These are not dirty words-- embrace them.While it’s most important to be happy, however you choose to run your business, I personally believe this behavior also maximizes profits.

You'll learn a lot about animal behavior and how people behave. 

However, with that being said with the situation of the windows it’s a behavior although there are several indirect ways to address!

I suspect the behavior has been that way since they were children and were never taught any different.

Monitor each tenants and their behaviors and see if you receive complaints and about any the tenant from the other tenants take heed and that will guide your decide with who you will have to get rid of.

This is absurd behavior on his part. 

.    --- Pet Amendment (addressing # of pets, size, breed, pet fee, that the tenant is responsible for pets behavior, what happens when there is an incident, etc.)    --- Utility Amendment (How utilities will be addressed, who pays, in whos' name, etc.)5.

-A low crime rate gives insight to the rentability of a property and the behavior of a population in the given area, also known as your tenants.