How would an experienced investor structure an owner finance deal here? 

I've estimated the rehab for more moderate priced homes but I suspect a luxury home is going to have a dynamically different rehab cost structure, and as I've stated I'm curious to know if there is a way to estimate a prototypical rehab number for a luxury home.To your continued success!

How can we structure the deal in a way that we can do the repairs ourselves without the risk of either party losing out in case the deal falls through?

These buildings are block structure, each with their own bathroom, no furnished heat or AC but some tenants have added it themselves.

We've selected a 6 unit ~ 250k to put an offer on that most likely will be accepted. We have 3 partners funding the down payment, the majority partner with over 60% of the money has the best credit > 800. The partn...

They should get appraisals and thoroughly examine all of the possible uses of the land and structures.

@Emily T.The short answer is 10 but you need to work with a loan officer or Broker who knows how to structure your deals correctly from the START.This is key to being able to get this many.  

I'm currently tasked with revising the management structure there.

@Tammy WiseYes, depending on how the trust is structured, you can do conventional financing while keeping the house in the trust.

These are the basic things lenders would differ in -- interest rate : Your interest rate will probably be structured around the prime which is 3.25% right now.- maximum amount of your house equity : How much of your equity would they let you take out, and if their interest rate differs for different amounts. - closing costs : if the bank would pay for the closing costs.