Sellers are not willing to extend the closing date. 

The 5-year term without an option to extend would make me nervous. 5 years is both too far into the future to know what external or internal factors might look like, and too soon to be able to react in the event of something negative. 

When the 15 years come up, you can either sell, refi, or extend the seller financing further. 

The trouble I am having was that originally the terms were supposed to be for a year (expiring September 2021), then we verbally agreed to extend to March of this year.

Makes sense to extend the closing date if we choose to go this route.

In the new lease, either add an extended guest clause with a fee due to the water or add her to the lease which helps justify increased utilities fees.  

If the report allows for spot treatment, you can just pay for the spot treatment and not tent the house so long as the infestation does NOT extend into inaccessible areas.

Man you buy a duplex the effects of principle pay down, fixed loan, cash flow, 99% of the appreciation after an extended period of time. 

I ended up buying a duplex with both units occupied and the new tenant not paying any rent.So in short, contract was extended to 60 close because I was selling another property to pay for this one.  

I looked into extended stay bnbs and came across this strategy that seemed like a good fit because it was also close to many healthcare facilities.