How to finance a duplex + ADU

[Chris May]

I've come across a few other posts on this topic, with a few people saying they found solutions but not many specifics offered.

I currently have a duplex with ADU (3 units total) for sale in Durham, North Carolina with a solid amount of interest. The problem is that Fannie Mae / Freddie Mac will not back multi family properties with an ADU. It's a bizarre distinction to me, but that's the reality I'm working with.

Can anyone point me to a loan product that my interested buyers can use? We've explored commercial loans, but the terms don't really work for most multifamily buyers.

Someone in this thread said they did it successfully, but didn't leave enough info for me to track down: https://www.biggerpockets.com/...

I figure this wonderful site must have an answer to this question!