If you are like me and have no experience in estimating the remaining useful life a roof, or hot water tank, then you will need to find someone who can. 

Sharks, take off you fins!

I found a lot of sharks at my Local REIA, offering me "Great Deals" that their pocket buyers passed on.

https://www.yahoo.com/finance/news/mortgage-applications-tank-9-post-120021588.html

At this point any proposed resolution is likely to fail (billing him directly for repairs, filling the tank yourself then adding it to his rent) because the bottom line is he doesn't have the money. 

They're having a a meeting tomorrow (May 9, 2019) and it's a version of Shark Tank for real estate.I'm going and hope to see you there.

If so you could have underground tanks that were abandoned in place that will cost to legally remove. 

I did some searching on valuations on Prop. shark and other sites, but nothing gave me a good price comparison.  

And in the situation as described, the judge or jury always sees the homeowner as a victim, and the real estate operator as the shark wanting to make money at the expense of the homeowner. 

I always wonder about the long term viability of those high end rentals because a) if things tank, spending 30k a year on rent because difficult for people and b) it seems like a lot of the renter pool (from what I have seen in my market) are short term renters, coming in to rent for 6 to 12 months while they relocate for work and buy a home during that period.