Oakland, CA ADU Conversion

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I am looking at a few properties in Oakland, CA that have either an illegal basement unit or guest house. I know the ADU laws are getting more relaxed here but I want to know if it would be too large of a risk to buy a SFR in which the numbers would only work IF I could get the additional unit legalized and rented out. Is there somebody I can consult who would be able to look at the property and tell me if it would be able to be legally converted? Would I be able to make an offer contingent on approval for ADU conversion? Is there any reason why a unit which meets all requirements WOULD NOT be able to get legally converted? Any thoughts on this would be greatly appreciated.