So he wants $100K cash and will do seller financing on the remaining.

Rent payment in advance remains the property of the tenant and must be held in trust to be drawn on each month as rent comes due.

A secured debt is one in which you sign an instrument (such as a mortgage, deed of trust, or land contract) that: Makes your ownership in a qualified home security for payment of the debt,Provides, in case of default, that your home could satisfy the debt, andIs recorded or is otherwise perfected under any state or local law that applies.In other words, your mortgage is a secured debt if you put your home up as collateral to protect the interests of the lender.

The owner and voucher holder enter into a lease which is no different than you would a non subsidized tenant, and you collect a a portion or majority of your rent from CHA on the 1st of every month and the remaining from your tenant which should also be the 1st of every month. 

My intention was to purchase a duplex with tenants on 30-day leases so I can reside in one unit after closing and satisfy the owner-occupant FHA requirement.

Seller financing -(get the seller to finance the remaining balance) - wait is that even possible?

I have recently placed it in referral mode and remain grateful for the knowledge acquired through the journey.

He also is thinking about putting me on the deed and then we refinance with me remaining on the deed.  

Example:IRA starting: $200,000Purchase property: $180,000IRA remaining: $20,000Repairs needed before being able to rent/lease property: $60,000What are legitimate (IRA-tax-status preserving) ways to get the work done?

Also friends should not lend friends money.If he is able to pay off his home he should have no issues eliminating the remaining debt as well.