What zoning code could I request a zoning variance or rezoning that would allow us to have the 2 livable units on parcel, one primary residence and one additional living unit (known currently as ADU)?

My wife and I have one rental unit and are trying to move toward our next property, but still are trying to learn more and find additional ways to make some side income to speed the process.

In southern CA, even garage conversion ADU additions are typically costing more than the value added.  

Duplex have different zoning that may permit additional units.

My dilemma has been that I've gotten a little behind on some revolving debt that selling this property now could eliminate in addition to giving me cash on hand to trade into some better value or start a new construction duplex project I've been wanting to start.

The intent of getting a sales agent license is to educate myself in Real Estate and create some additional income.If your relationship is such that you need to hide your license, you’d be better off with a different working relationship.  

So you have to weight risk to reward.. and sometimes we have to eat one that we bought it happens..

Otherwise, you may need to replace a water service (13-15k), electrical service (10-15k) and upgrade wiring (This is a tough one, but maybe an additional 8-15k inside).

Hey Tyler we hate to hear that your experience was negative sincerely we would have hoped that we could have come to a resolution we know that you and your partner had made a request that we do $800 of work that was unfortunately not in your scope of work at the time we had exhausted $4900 in additional work to ensure the property was to satisfaction which included a new hood range upgraded lvp flooring additional framing  new window and a paint upgrade from a single color format to a multi color format and can lighting all of which was never in the original scope and unfortunately when we requested that we do the work you declined I’ve attached before and after videos of the home for reference https://www.dropbox.com/scl/fi/h0ddll4cyp5g5gq12o73s/Video-J... always twos sides to these stories.. 

Most look at a Certificate of Insurance and confirm coverage limits but best practices are to (1) become added as additional insured under contractors policy and (2) understand coverage exclusions which are not going to be detailed on an insurance certificate.