Land classification in ADU law in CA

[Nahid Alipour]

Question for my fellow Californian, I have single-family attached home or townhome that want to convert my attached garage to a two-story ADU but the city is telling me I can not build the 2story ADU and I can only convert the garage to Studo ADU or One bedroom ADU but I can build and add that 2nd floor as part of my primary homa but it can not be part of the ADU because my home classified as multifamily because is attached, regardless of what is in my title or tax assessor and appraisal district...

So my question for those expert in ADU law or land law is, can a house change classification from single family attached to a multifamily even when every document you have indicate you are single family attached???