City permits for this are way harder than most people think and most neighbors in a residential area will NOT want this next door to them (NIMBY).

My concern is that they added a room without permit(Not permitted work).

Make sure to check zoning laws and permit requirements in your area, and maybe connect with local contractors through referrals to get multiple quotes.

Also, I wanted the license to be able to pull my own building permits and do my own projects. 

Looking for some insight/ experiences from folks who have furnished rentals/ Airbnb in Anaheim (City requirement 31 day minimum unless you have a permit).  

Rethinking density limitations like building height, parking requirements, and ADU permitting would be more impactful. 

Example would be for a SFH fixer upper in grandma condition:   $10k for demo and permits and prep, $10k for wall removing and layout revising, $10k for basement framing, $10k for drywall, $20k for paint, $30k for flooring, $20k for kitchen, $20k for baths, $20k for any MEP upgrades, $10k for trim work, $10k interior finishes 

After 18 months I still didn't have a building permit and decided to cut ties with the builder and forfeit my deposit. 

Are you up to date on all of your licensing and permitting to legally rent this duplex?  

do you have a background in, or access to expertise in, permitting and construction?