Junior liens get extinguished unless they have super-priority.

I took a class at a local junior college once titled "air conditioning maintenance for the homeowner".

I suspect this is true of San Jose, but I would recommend you go to a local RE meetup and get feedback from local investors if no one can provide a definitive answer here.By traditional ADU, these are ADUs that are not Junior ADUs. 

Thank you @Junior Silva I intended to do the property management and realtor.

Thanks @Junior Picanco.

My son is a junior in high school.

Everything started with me funding a fix and flip project in Washington state as a junior lien holder.

FWIW two of us are (junior) corporate attorneys and I'll read "not legal advice" into any and all responses.  

Welcome to Biggerpockets @Junior Mac Great to have you in the community

The ability to turn an SFR into a 3-plex by adding an ADU and a JADU (junior adu [garage conversion]) means we can maximize cashflow and get a huge ROI by also adding square footage and adding overall value to the property.