Instead, we offered to sell the jointed property which will be enough for him ($15,000) for some time.Since we are liking the RE business we are considering buying his share and keep this property.

I do Joint Ventures deals on a 50/50 split.

If your partner is on title with you, you don't hold everything in the deal, he is on title so it is joint.

Start putting together some savings and Capital that you are willing to invest, that way you will be able to convince a joint venture capital partner to invest with you in a project you will find and manage.  Our company works with many project managers in that way.

Why don't you Joint venture (JV) with Investors, and discuss your exit criteria (i.e you want 5K per deal), and showcase what you can bring of value to the Investor to the deal?

He said a full financial firm could handle it better. sounds expensive. how much should I expect to pay here in the SF valley in Los Angeles considering the 9 rentals I self manage and my wife filed jointly. 

Maybe joint venture with someone who invest in affordable markets in the US.

Some provide joint ventures, some provide bridge financing and some do rehab loans.Stephanie

I'd recommend LVP for flooring. you'll need a table saw or circular saw for cutting, also a pry bar to pull the joints together. a good box cutter knife as well. tape measure and pencil. also use pry bar to remove shoe molding at baseboard if there is any. 

Some of them are showcases for their own deals that they originate or joint venture (like ArborCrowd).