What to ask before buying a property with unpermitted ADUs in SD

[Cameron Weston]

Hi there folks! Have an interesting situation on my hands and wanted to get some input from the community before taking any action. 

I am looking at a property right now, here in San Diego, that is a triplex - one main structure with two attached ADUs. Now the property is great except for one catch, neither of the two ADUs are permitted. 

Right now my plan is to pay an ADU subject matter expert to do a consultation on the property before taking any next steps. I am hoping this can yield an answer on if these ADUs will be permittable. If they can be made legal, and I can get the place at the right cost, I don't see any reason to not continue forward with the deal.

If you were in my shoes, what questions would you be trying to answer before moving forward with the deal? Are there any major concerns that come to mind?