Seller Financing - Multi-Family 2.2 mil

@Michelle Simoni, I am going to be slightly sarcastic here:

Irresistible terms to offer: 100% interest/yr for 30 yrs...

But more seriously, you need to know their motives.  I, for one, would never sell a property with any seller financing that makes sense for buyer.  If I want to sell, I want to sell, not sort of sell while also having a financial stake in the property and the risks associated with that.

Is the seller needing/wanting more cash flow for a duration of time?

Is the seller concerned about capital gains taxes?

Does the seller have any actual capital tied up in the deal?  i.e. someone that bought the property 30 yrs ago for $300k likely has no capital left in deal, so it is all profit now.  They might have more reason to be creative than someone that paid $2.1mm 2 yrs ago...