While an S-corp may offer tax savings, its possible that those savings would be eaten up by the the admin costs.So many variables here that it really pays to consult with a tax pro.

Instead of discussing the possibility of owner finance with sellers - what if I offered the opportunity to  JV where they are the equity partner?   

I bought this property with a private interest free loan from a friend. the person i bought it from need cash fast so i offered them a low cash offer and they accepted.I had enough money saved up to rehab the house with my savings.

I know we wouldn't include a clause like that if we did offer brokerage services because our Property management agreement has a 30-day notice to terminate at any time for any reason no penalty. 

Let's say 20%...now let's do the math:You offer $320k, 20% down is $64k so you finance $256,000 @ let's say 6%....you neglected to mention where this property is(!) 

In my opinion, making an offer site unseen is not a risk.

It all started when my wife's college friend offered me an opportunity to invest in a commercial property.

I agree with Michael, probably need to make 100 offers per 1 accepted to find a good deal. 

Or you can offer a low enough price to make sense.

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