Need Help w/ Creative Finance Deal

[Joel Duby]

So, working a deal what I think has great potential. 

Description: 10 unit apartment complex on top if two commercial units. Brings in 11k per mo, rents need raising. Final price not secured yet but guessing it'll land on 900k. They want to seller finance only. 20 yr term 6%. They want $350k down, 275k will go towards a private interest only loan that is due in 1yr. 

My question: I don't want to put 350k down. They want to seller finance only otherwise I'd go get my own commercial loan. What do I do here?