In that case just defer doing unnecessary work to the unit. 

Things get more complicated if you have a legitimate reason to believe the person is lying to you.

The word “tenant” is an extraordinarily generous euphemism in this case.What complicates matters more is that in New York City, someone can claim “squatters rights” after being in a home for just 30 days.

Some of the deal structures on these are overly complicated and involve way too many people, more like a house of cards than an investment strategy.  

They can get complicated pretty fast.

The interface is like a parody of overly complicated design.

I see a lot of narrative around, "cut your costs, eliminate unnecessary expenses" etc.

Dont over complicate it. 

From that point, some sort of banking engine would need to be involved that was sophisticated enough to handle and understand trivial to highly complicated financial transactions.In any case, it would be fascinating to a small niche of people (myself included) so not too likely to become a commercial success.

The weakness of these strategies is that the system is complicated, and it costs money.But what you are doing is setting bait, a lure, and anyone that falls under the right prerequisites (wanting to sell their house fast for cash hopefully at a discount) will find that bait irresistible and they bite!