I have a duplex in Illinois that I'm thinking about selling with owner financing as it's a free and clear property.Where would you post that?

Current owner asking for one closing, with all properties, but perhaps they are mistaken and this is not possible?

It is a 2-unit multi-family with a finished basement that is occupied by the owner.

Comps are on all the online sites in the states I do my biz, 

Most are like this: •Rates: 9% to 13% (Most Deals are 11-12%)Terms: up to 36 Months (Most Deals are 6-12 months)Fees: 2-4 points(%) of loan amount paid at closing (Most Deals are 3 points(%))Minimum Loan Amount: $50,000 (For loans less than $250,000 $2,500 minimum fee)Max Loan: 65%-70% of After Repair Value(ARV) 100% Rehab Financing Available (Require 20% of purchase price down payment or cross-collateral)Closing Timeframe: 48 Hours - 3 Weeks (Most Deals are 2 Weeks)NO PRIMARY RESIDENCES, NON-OWNER OCCUPIED ONLY, BUSINESS AND COMMERCIAL USE ONLY.

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Please keep in mind that I plan to rent to college students and the free unit is about 2,000 sqft:- I went to transfer utilities and the past owners have a balance.

What's the ideal business structure in Texas for sole-owner, flipping business that offers anonymity, tax efficiency and asset protection?

@Mark VesuA written agreement among co-owners is always a good idea. 

In Metro Detroit there's a shortage of S8 rentals because:---Many owners are NOT willing to deal with the program paperwork headaches & tenants (why do you think many pro-tenant factions want to make it illegal for landlords to discriminate about source of income/S8?)