It's my opinion that you should use a heat treatment and not a chemical treatment as heat treatments are comprehensive and can be guaranteed, and spray treatments do not always kill all bed bugs and can be a waste of money.

The paint is rolled on so that painting contractor cannot dilute the formula when they spray. 

Ex: If a tenant calls up to complain that their drain is broken or running slow, or that a light fixture needs replacement, or to spray the Apt with insecticide, or to fix a broken door-lock or window frame, or anything of the like such as the fast repairing, touching up, painting & cleaning needed during a turnover between Tenancies...

Maybe little signs or spray paint numbers?

If you find a hole in foundation plug up with steel wool and the spray foam stuff. 

If it's just surface mold that can sprayed, washed, and cleaned up that's way to high. 

-Carry pepper spray, horn, concealed firearm etc…Hope these help

On the bathroom window that overlooks her window, put some removal glazing on your window (there is a vinyl that you spray water on the window, apply the vinyl and smooth it out-completely removable). 

Too much risk for damage, spraying etc.

Soil type, adjacent land and what they have on them (spraying chemicals or not).