Why is he owner financing?

[Account Closed]

Building a list of owners to contact and I have come across a multi unit rental property for sale that confuses me because the owner is offering owner financing. The owner has completed some upgrades and there doesn't appear to be too much work ($5k or less) to get this thing 100% rentable. 

So I guess I am trying to figure out the sellers' motivation for marketing / highlighting the fact that he will do owner financing?  

Please keep in mind that I am a complete NOOB (only been studying this stuff 8 hours a day for the last few weeks). But, the reason I suspect he may be offering owner financing is because the property is classified as commercial property, thus making the downpayment requirements higher (20-25%) for commercial lenders, if I understand correctly? 

Just hoping to get an idea of situations where a deal "looks good" on paper where the owner is offering owner financing but turns out to be a disaster.  Thanks!