Any model cities or ADU zoning roll out?

[Michael Leeson]

I'm working on a proposal for our city council allowing ADUs to built on non-owner occupied and multifamily properties.  Madison, WI currently restricts ADUs to owner-occupied SFHs.   We're of course severely undersupplied on rental units. 

Are there any great examples of cities allowing ADUs more widely with sensible zoning and positive impact?

Any help is much appreciated!