If no one bids then the bank wins the property and zeros out the account to sell the property as an REO.Then you haven't seen enough of these; in undesirable neighborhoods in the suburbs, the bank's maximum bid will frequently be below the debt that was owed. 

Once the property is off their hands and into mine, I act swiftly to get everything in line and either save the tenancies or encourage undesirable tenants to move.

I'm taking a 178 unit complex in a C- area with 20% occupancy, first down to 10% occupancy by evicting the undesirables and non-payers, then renovating the remaining 160 units and slowly filling it up.  

My leases for pets make it undesired.  10% increase in rent monthly for pet rent 100% of the deposit in addition so 2 months rent deposit total for the pet.

This is standard practice.He is obviously a undesirable tenant having paid late 3 times but the reality is he pays late because you have not trained him otherwise.

He dropped all his undesirable freelance work, but he might pick up something like that.

Let's take your "undesirable areas" for instance.

Maybe that advice would normally be a good rule-of-thumb for most people in most situations, but what if someone finds a good deal in an area deemed "undesirable"?

Low demand/undesirable areas=low prices.

I’ve always heard to stay away from these types of properties, because they are undesirable to tenants.