From what I'm being told, this addition has been built to code and although this will be confirmed once the inspection is complete, I am trying to better understand the process to convert this property into a legal duplex.

Certain big items, such as complete AC replacement, require a permit inspection in my county. 

You should also get in each unit ASAP to take photos + compare that with their move-in inspection if you have one.

I am a newbie investor, but licensed pest control professional willing to give out free inspections.

Another sinkhole example in the judgement is $16000 for property inspections, and its closed up so you can't inspect the inside.

They don't come and do any inspection of exterior or anything so very easy.

Higher taxes, rent control new regulations, open border, increase in renter rights, lawsuits, property values down, increase inspections, loss of property rights, social  ownership, a nightmare.

As soon as city inspections done- I have a door going in.

Plumbing and electrical need to be hired out, you will need to find someone for this.You can go on the website for your city and learn what you need to do as far as permitting and inspections or you can find a GC that you can hire to come in once or twice a week to coach you and take care of the city.

@Catherine Rathe I suggest my clients use pillar to post for inspections.