The root cause of the foundation problems is possibly the expansive clay soil.

I would consult with a local draftsman first and foremost  and come with a solid flowing plan.

I think we have a solid plan to spend the proceeds I think I just want validation.

The numbers I'm pulling are north of $3000/month which would equate in solid cash on cash, and cash flow with 25% down on $489k property.This home was built in 1925 but very updated across the board from interior, exterior and major things like new roof in 2012, new AC in 2015, and new plumbing / electrical in 2017 - BUT, this was built in 1925 and still at the back of my head.

Those are some solid numbers. 

Does anyone have a solid recommendation for a real estate lawyer in Tulsa, OK who not only has set up Series LLC but also know tax law or at least has experience with it?  

Solid appreciation + cash flow.

I think I have a solid foundation but I am interested to know: Is there a certain multiplier I can use to convert median price of a single family home into the approximate value of a multi-family home?

Seems like a solid deal. 

Solid points.