I would talk to Jeff he is an expert in southern CA lending.In the day and the day was long ago for me.. but we did all our loans as fractional in the SF Bay ARea were I had my company. 

Electric company put leans on the owner. 

Currently, I've been outsourcing this task, but due to some recent success with helping people close on houses, I want to reinvest my earnings in a company or individual who can handle this for me.Specifically, I'm looking for a small business that could benefit from some financial backing to expand their operations.

Set up separate company to "master" lease hard to lease rental units2.

Or could another broker at my company list and get paid commission so long as the company doesn't retain any profits and just acts as a pass-through entity to pay the other broker? 

If you are looking for recommendations on who the best turnkey companies are to partner up with, then I am your gal.

The only benefit in this instance, as an investment partner in a JV, or member in a multi-member LLC, is it's an act of "good faith" on my part in the agreement, being extremely transparent about the project's costs for the construction company, and the specific amount the partner/member invoices as profit or salary attributed to construction services on the specific project (I differentiate profit from salary, as it depends on the size of your construction company, a smaller company the profit may be the salary etc). 

I plan on using a property management company in order to keep the property in order until I move (eventually I want to bring property managers under my own business entity to focus only on my properties). 

Several of the companies you listed, ex: propstream are great list aggregators, but their add on services (such as skip tracing) can be sub par. 

Ideally, it would be great to deal with a company that has a call center where I could pass on these leads.