Why is it undesirable?

You never know who can bring the undesirable element to your property.

If they regarded it as outdated or undesirable anything is possible.

If they pay prior to be evicted, they have just become an undesired tenant and will get max rent increase until they leave.  

The property is damaged beyond reasonable repair (although you said it's turnkey), the tenant's have not been paying rent at all, the rents aren't actually set at $1,000 per unit, the area is too undesirable even for investors to handle, etc.

Las Vegas ones are 80% undesirable as well.

I could see a 2bd 1 ba but a 3 or 4 bd 1ba sounds very undesirable.

It depends - if I carefully screen tenants, clean up the property and take undesirable behavior seriously in my buildings, I'm likely to improve the whole neighborhood just a little.   

Unlikely unless you plan on doing something shady or not taking care of your properties.Your mortgage will make it undesirable to sue.

I saw some other duplexes but they are located in a neighborhood that is very undesirable.