I have the S-corp established with a bank acct & a credit line that I would use to help with any expenses if necessary but I don't know if I can pay for anything thru the business if it not owned by the business.

You credit hiccups aren't as important as the performance of the building itself, but you can bet your behind that your debt service costs are going to triple. 2% is a sweetheart deal that you aren't going to find in the market right now. 

I anticipate this area to (for better or worse) gentrify substantially during the next decade.This is not to mention the new Rush Line BRT that will be built in the next couple of years (https://www.maplewoodmn.gov/1168/Rush-Line-BRT).

A shared fence is owned by both parties if that fence sits on the property line.

Scottsdale, Tempe and Central Phoenix are probably your best bets.

The roots are already lifting up the pavement and causing potential hazard, it is just a matter of time until it finds it way to the sewer line.

We were going to do traditional financing, but the HOA reported that 92% of units are rentals, thus making it a non-warrantable condo, hence our predicament.We have a couple financing options lined up. 

I am willing to pay the extra to have the pluming main line scoped looking for tree roots ect.  

Hopefully someone will see this line of thinking and can further expand. 

There are lenders that will provide the capital for your side of the closing, often they just require proof that there is a buyer lined up.