The first option was through their commercial department and it was a 20 year adjustable rate loan at 75% LTV.

The 2 lenders I use for rehab loans have departments that specialize in them, and have concierges to help us every step of the way.

The local Department of Development and Economic Planning can advise you on such things. 

I would strongly suggest talking to someone in the permit department at the city to get a straight answer.

Some banks have separate departments for business and consumer lending.

This was my first off market purchase and my first seller financing transaction.

If you are "transacting" in a state, some states (mine in particular - Illinois) require you to file an "authority to transact" business which in some cases costs more than the LLC itself.

How would that transaction work?

So the more tax you can defer over time the more income you'll make over time from the deferred tax.A 1031 does require the use of an unrelated 3rd party to the transaction called the qualified intermediary. 

Local police departments are another good source of crime data if you're at that search level.