Or is this type of deal just not doable and its 100% seller finance or all convential finance...

Are you communicating that you should not "buy on a wrap and sell on a wrap" without getting the ok of the lender @Bill Gulley?

@Benjie DeVera and @Anthony Murphy, I think there is a communication gap. 

It could be that the permitting requirement they explained to me was only required of the MEP contractors but not communicated as such. 

How well do they communicate?

Or all of these?

I never did get an answer as to whether or not the 900k is the down or all closing costs. 

Lender's and Realtor's.However, if you use the lender's and they have a company they always use the communications may be helpful with getting things done.Also, if you are going to use him a lot it is brownie points to keep loan and title company that work well  on the research together.With Realtors's it's just brownie points you can use whom ever get's the job done to your satisfaction.Hope this helps!

The seller communicates that the tenant is very dependable and has never missed a rent payment.  

will the money most likely be due monthly or all at once?