I'm feeling bullied and as if I'm being held hostage and am not sure what I can legally do. 

Does anyone know how this is defined legally in CA?

The absolute BEST (and most expensive solution) is a highly qualified attorney who’s a specialist in estates, because they will provide the optimum documentation, legal thinking, and specialized situation for every client.  

What is my legal obligation to close a property that's not listed by an agent?

These fees include charges for appraisals, inspections, title insurance, legal fees, lender fees, and various additional fees.Here is a list of some of the fees you can expect to pay in addition to the money upfront when investing in real estate:Loan origination fee: This is the lender’s fee for processing the loan application.

Removing Hassle: Take care of moving costs, dealing with tenants, or assisting with legal paperwork to make the process smoother for the seller.11.

Without responding with respect to your zoning and what is allowed locally, I will discuss what is allowed on state level because i believe it will allow what you seek.In 2025 SB 1211 (Skinner) – Multi-Family goes into effect allows an ADU (I think it specifies detached but question if that is a requirement) for each legal non ADU unit up to 8 units.  

I understand STR is not legal in Oakland, but yeah the unit is on the more luxurious side.

As an investor/agent, am I legally able to pay a bird dog a flat fee or a percentage out of my profits ?

Here are some extreme cases that are mostly 21st century issues:- cannibus is legal in many states.