They request what is called an “as-repaired appraisal.”To give a general picture of how the as-repaired appraisal fits into the process here’s a very basic look at the steps involved in a standard 203K loan, sometimes called a Consultant K* loan:The borrower selects a property, a lender, a 203(k) consultant and a general contractor.The lender pre-qualifies or pre-approves the borrower, and determines that the property is eligible for a 203K loan.Working with the consultant and the contractor, the borrower submits a document that specifies all repairs.The lender requests an appraisal.

If each co-owner has an undivided half interest then have the co-owner who wants to sell, write out a detailed affidavit with any available documentation -listing all of the expenses that each co-owner has paid for mortgage, taxes, insurance, maintenance etc, during the last three years (or whatever your local statute of limitations is to file for unpaid debt). 

However, I recommend you document the change of ownership and that the lease remains in place.You should only have someone else sign for you if they have the proper authority.

I put a SFR on a commercial loan once because I didn’t have enough “history” in the rental business to get into a 30 year fixed.

If you going to buy Cash you don't need your credit History or Score. venesa find me in facebook we can talk more 

Most are set up to help you virtually and will use secure document transfer and electronic communication via email, Skyle, etc to communicate with you.

But I'm wondering if they are as useful and applicable (i.e. the ability to edit) and if there are other more cost effective means to obtain said documents.

If you cannot find the documents to support the buildings current use as a three family, ask the city what they view the property as.

Insurance down the road.How long are pre approvals good for usually and what documents do I need to get together for that?

Having documentation will keep you from acting impulsively and trying to force a deal that may not be in your best interests.