What I've learned through the BP Blogs and Forum posts is that the more leveraged you are and less equity you maintain then the more undesirable you become in a lawsuit.

Have any adjoining areas become blighted or otherwise undesireable?

Do you think that people are holding on to what they have out there or that there is just a shortage and the only thing on the market right now is undesirable stuff?

Unless the property is in an undesirable area, it should not take you long to find a good tenant.

But follow and find when the city approves mid/higher-end mixed use commercial builds in otherwise undesirable neighborhoods!

A wholesaler will go into war zones that are entirely undesirable because they envision potential. 

How much time, energy, fuel/mileage (this is huge if you live in city with bad traffic/commutes and the property isn't nearby), resources are you going to spend to try to get an undesireable property to sell quickly?

Do people have any experience renting out several rooms in the same place to traveling nurses/professionals and find out that it is undesirable? 

Or do you do the undesirable things yourself?

These are undesirable tenants!!!