contract or loan? tri Plex

[Brody Jett]

Hello bp. 

Ran into someone wanting to get rid of their tri Plex. It's 2980 square feet total Victorian home 1984 built. updated exterior Windows. my question is how to get this deal, or suggestions on options. 

My real estate agent says home comparables are around 245
Lady wants to get 185k or 175k as is. needs about 3k in updates. woman selling owes 90k. 
I asked if she would mind doing a contract she was very open to anything. Can someone tell me a good way to pursue a owner financing or contract with her? the 3 units are around 775 a unit per month so if I can do it right should be a good deal. 
Thanks for any help.