If they are German roaches, a few days after treatment, you have to go in and clean up the dead bugs.  

The best treatment for me has been this forum!

It will ask the medical professional if the tenant:1) has been under their regular care for treatment of their disability;2) that the tenant meets the HUD definition of disabled;3) that they require a companion animal in order to be able to live comfortable in your unit, because of their disability.You have every right to require them to meet the definition of disabled and to have a bonafide medical professional verify that they are disabled and require a companion animal because they are disabled - in order to be able to live comfortably in your unit.If the go to HUD and complain that that big meanie landlord didn't let me have my two "service" dogs, HUD will not immediately believe them.  

I have been doing it for years and have a treasure of info about market rent, deposits, utility treatment, PM's, owners, pet policies, average stay, and empty days.If I were you I'd aim to have two months of mortgage payments liquid, and a plan for how you can quickly come up with two more months if needed as a safety net for unexpected repairs, lost rent, etc.  

If someone in the United States did what you do, they would be subject to a Fair Housing complaint, unless they fit within the size limitation exemption.Neither the codes in the US or Canada state that mentally unbalanced applicants have a right to  preferential treatment.

If he gets special treatment from you then he will demand it from the next landlord.

Had a potential tenant ask me if I did monthly pest control treatments on property??  

Just disrespectful treatment.

So you can't charge additional for an ESA, but surely you should be able to have an addendum, OK call it an animal addendum to require general things like the tenant is still responsible for cost of any animal damages, or flea/tick treatment of the property when they vacate, or keeping up with vaccination, must pick up after the dog etc...on the other hand, let's use "pick up after dogs" as an example...if the tenant is blind and has a seeing eye dog, how would the tenant go pick up after the dog? 

The place has been treated, preventatively, on a regular basis since the heat treatment years ago.