It is apparent that he didn’t do his due diligence to well handle the purchase process and didn’t disclose the sufficient information to us before our purchase.

The guy on the lease sleeps in the living room and rents out the other 2 bedrooms for $450/mo to other college students and I do not think he has consent of the landlord.

Being cleanlier than your neighbor generally does the trick with rodents if there is not already a problem in place.If it is a one time thing I would not worry too much about it, but seeing that invoice may help you sleep easier.

I would not volunteer any information about your property ownership or corporate structure as it is and area outside the expertise of most boarder agents and foisting such material upon them is just asking for a longer sojourn at the border.In short, when asked tell the truth, but only the information sufficient to answer the question.

Buying a non-performing asset (an asset that generates no income), that I am only going to sleep in that sells for 6, 8 or 10 times the average income in a particular area, is not something I thought was a good "investment" in 2006, nor do I think it is today. 

Not good if the other tenants are sleeping. 

I will be able to get this because the potential client CAN NOT qualify for a loan but has sufficient income to pay the new payment which will be $1,100 per month. 

In your neighborhood, you don't want to have a vacancy very long, because things can tend to 'go missing'.If one tenant has sufficient income to qualify based on your standards, but the (probably) student with no social (BTW, get a copy of their visa for your records, and proof they are a full-time student) does NOT have provable income or background, the ONLY way to go is to get first, last and security.Since you are living there, you will have a better handle on the day-to-day, and you MUST stay on top of things. 

For the later you need to judge if the space is sufficient and this would work for you.

None of these properties are big enough deals that I'll lose sleep over them, but I could use their money on them to make the deals happen.