Physical damage was negligible, but smoke damage was throughout and electric/gas were shut off because wires were burned.

You won't get many answers because it's too generic a question.Go to google and search "residential lease agreement" and you'll literally find hundreds of agreements you can review to see if there are any clauses you may want to incorporate. 

If you're interested in buying one I recommend going to the physical location to make sure the property is still standing.

I don't think that's "economic vacancy" I think it's actual physical vacancy.

In both cases the lease is the same, but the option gives the tenant the "option" to buy...they are not obligated to, but you are obligated to sell if they execute their option.Things to remember:1 - The option and the lease are two separate contracts, and should not be connected to eachother verbally or physically.2 - Do NOT give credits towards the purchase from either the rent or the option consideration (see #1)3 - The Option Consideration is NOT a down payment. 

Those are two things that are impossible without someone physically there.

One is through software and the other through a physical inspection. 

Today I am grateful for my physical and mental health and the physical and mental health of my family.

Then once you waive the books (and physical inspection) contingencies, make an "official" application for financing as another contingency.If you're unfamiliar with any of this, get a commercial broker or a RE atty to write this up for you.

I can sit there and with enough data give you a very close number to all mayor lender's high bid but other than as an educational tool so you can incorporate this type of process to the way you set YOUR high bid, its really of no use.Why?