Just evict them with damages, clean it all up, and rent it out again.

There was a judgment about some BC buyer who didn't close and they owed 350k in damages.

The most common benefits a landlord can get from an arbitrage agreement are: reduced vacancy expense, decreased maintenance costs (most arbitragers agree to fix any damage done by guests), increased rent (most pay a premium), reduced number of hours managing the property (aka it's more passive)Some less common benefits, but still worth mentioning: Using the property to host their own guests at a lower rate during the "vacation season", Revenue sharing, arbitrage managing landscaping, and other management tasks. 

There is no charring or damage to structure, just smoke discoloring as far as I can tell. 

But, if repairs come up and they don't have the money to fix them, if they put a bad tenant in that does a lot of damage, or in general, if the neighborhood starts deteriorating, it could turn into a bad investment.These are all things to think about with any real estate investment.

There is small retention pond kind of area next to my property belonging to city which they are not managing ( There are big trees there which are close to my property about 12 feet away which may damage roof if fall towards my property but it never seems happened since 1961 touch wood).

The rapid rise in interest rates have caused somewhat of a mess for multi-family but that damage is likely already in the past (but not played out yet).

I never take them up on this offer as they are not insured and they could hurt themselves or cause damage to the property or someone else.

In public records was it ever assigned or were you ever notified of a transferOnce you find the lender I would reach out to them directlyI would also get an attorney involved in the state and potentially seek legal action and see if there are also trebled damages as well.Was the loan already paid off?

Drain System: POSSIBLE DAMAGED LINE.