I have seen one system go to $50,000 as it required trucking in a lot of sand along with tree removal.Connecting to town sewer is often financed by the municipality. 

So often, I get calls from people asking about a property they found on realtor.com or trulia or Zillow, and I have to disappoint them and tell them it’s already under contract.

Hi John,If you don’t mind me asking, do you know how often they do the meet up you assisted?

Another potential issue is what kind of tenants are they even?

If there are a lot of tenants searching for rentals that allow pets, it is best to cater to them with whatever limitations seem fair (pet age, breed restrictions, size, etc). 

In fact  such homes are often of superior quality because they are built in climate controlled indoor plants rather than lots of inclement weather. 

You can make any offer of tenancy contingent on no prior landlords coming forward.We should do our due diligence and try, but we aware that it is unusual to actually connect with very many prior landlords.

They often disagree with each other how just about how things should work.

On listings I often see "property taxes" and then a separate "school tax".   

Sometimes it's best to keep in the original owner's name because the insurance is often cheaper if they've owned it for a while with no claims.Regarding paying him off when the balloon is due, I think the most common approach would be to get long term financing and pay your uncle off.