How long has it been since the water/moisture occurred/entered the building? 

@Ryan Adams The reason policies have vacancy clauses is exactly what’s happened here....in a avacant property when a water leak occurs it can go on for weeks without being detected, as opposed to almost immediately if someone lived there.

Especially if you have a couple guys present you should be able to see any issues relatively quickly and then shut the main supply back off within a few minutes, no harm no fowl.

But in terms of "how" the savings actually occur (which seems to be part of your contention), everyone says that, for example, if you won $130,000 in the lottery and dumped it on the mortgage January 2023, the resulting $105,308 in interest savings basically comes two places:The last 30 months after your lottery payment where you still pay interest, but it's a lower amount and, The last 23 years and 5 months of the 30 year term (the time that you no longer have to pay your mortgage) The problem is, I can never get the math to work out, so here's what I come up with and you tell me where it's wrong.I get an average interest payment over that time of $273.XX and multiply it by 281 months (23 years and 5 months) for the bulk of the savings - $76,715.The remaining 30 months you are still paying are at an average of $43.56/month of interest for a total of $1306.95 interest that you have to pay on your last couple years.From Feb 2023 to July 2025 you WOULD HAVE paid an average of $559/month for 30 months which equals $16,770. 

Every April and October I have a client or two that suddenly can't pay their income tax bill; never occurred to them that if they go into escrow when taxes are due that they will have two big expenses to pay that particular month.

The attorney for the seller will attempt to get the buyer to indemnify the seller for loses occurred by non payment of the mortgage or by mortgagee foreclosure.

And in that case, make sure your tenant isn't in immediate harm (one way or another), and then get it fixed as soon as possible.  

Any changes that are likely to occur on this small of a project will be minor and will get absorbed in our "General supplies" budget which we carry as a contingency on every project. 

Getting into a legal battle, even if you win, will do you more harm than good in the long run.  

There will be months that show a profit but then a large cap expense will occur wiping out many months of the positive cash flow.