If they regarded it as outdated or undesirable anything is possible.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

Cons: Very high monthly payments would necessitate we rent out our ADU on our primary property which is undesirable because we'd have to invest a substantial amount to get it up and running, we'd no longer have use of it (we use it a lot for family and friends) and we are stuck in 30 day only market so the return is much lower than with STR. 

Will a lender (bank) look at my current debt when I attempt to purchase my first real estate property and see that I currently have a mortgage already (too much debt-to-income ratio) and as a result this makes me an undesirable client for them and more difficult to obtain that 2nd mortgage for my 1st rental property?