Another issue people have is they classify service animals as"pets" when they aren't.

With 4 units you are maximizing what your deposit/loan gets you, if one unit is empty then you still have 3 generating cash, etc.Once you start looking at 5+ units, they are now classified as commercial real estate so financing changes and so does insurance.  30 year fixed with 25-30% down and low fixed rates are no longer an option, you have to get a commercial loan, which from what I have seen means a higher interest rate and shorter term (20 year max I think). 

For starters, many A-class cities have apartments that have negative cashflows but can be classified as good/stable investments (for folks who simply need to park cash).Like others said, whether it is a good idea is dependent yourself as a whole.  

How much violence has to occur within a specific area for it to be classified as a war zone?   

Even with obese people now being classified as disabled, wouldn't that mean you could still require them to "modify" your unit to, for instance, a bariatric toilet, and then modify it back to normal, or be able to hold them responsible for any damage they do to the regular toilet or plumbing if caused by their weight?  

It probably classifies their traffic violation into a specific category. 

Your tenant with heart issues might be able to find a doctor to classify him as "disabled" or "handicapped".

First of all I need to make sure that what she is doing is indeed classified as "hoarding" but I will definitely do a bit more research here on the forums.Jennifer T.

You start looking at the classifieds to see what you can get for the same rent you're paying, and gauging how high the rents might go, and can you afford to move, etc.In other words, these guys are already spring-loaded to move, if necessary.Now imagine you get a letter from the new owner saying you need to re-apply for the rental you've been living in problem-free for however long. 

You cannot stereotype Section 8 residents any more accurately than classifying all steaks in the same group.