I would rent to a former landlord for sure without being threaten of their industry knowledge.

Just tell them you "feel threatened" and wanted to report it for documentation purposes.

This motivates them into working with you to come to an agreement and get the loan reperforming.The NPN investor I spoke to said he has proceeded with the foreclosure and taken the property subject to the first on a few occasions and in some of those the first threatened foreclosure and never followed through.

He may try to fight you for it...or threaten to...but if your lease says no modifying, and you have proof, then you have a strong case.

Like imagine if your day consisted of locating other people's properties, taking them over, then threatening to sue when they tell you to leave?

I don't want to have any legal problems if I quitclaim.I don't want to be liable for all these problems that threaten the safety of the tenants.

Threaten to tarnish her credit if she doesn't stay in the state?

The gentleman told me that Citi threatened to foreclose on the property.

He's really annoying, so I can be the nice owner, but threaten them with him if they don't play nice.LLC works nicely.  

If the problem continues, give another one threatening eviction (if they are on a month-to-month lease, just don't renew it and they will be gone soon enough).