Many ignore the issue and have no intention of operating morally and ethically.

The most effective way is heat treatment but not something I can do in an apt.

Would love to get some schooling from you more experienced Pro's out there on the best completely legal and ethical way to structure this.

I want to do things, morally, ethically, and legally right.  

That gives you different ethics and access to the MLS.Hope it helps some and good luck with your investing

When a specific infestation is discovered a more intense treatment will need to be done to bring it under control.

We didn't have contracts in place with many vendors, such as: lawn care, pest control (including white fly treatment), attorney, or irrigation. 

Do business ethically and you should never have a problem. 

I think, to avoid any trouble for yourself, and to do what is ethical, is to take that savings you get back from Bob and bring everything up to code that you are aware are not up to code, and do better homework in the future. 

You are in violation of at least half a dozend rules plus there are moral and ethical issues.