I am a licensed mechanical contractor and ran a commercial service company for around ten years, but never messed with new construction in that business.

If you're able to scale and take that mechanism to buy 3-5 quality houses, you may be able to sell 1 to pay off the others and just make nothing but cash(outside of taxes, insurance, property management).

Renovation of fixtures and cosmetics without mechanicals about half that amount.

Well because you can't count sheer dumb luck single deals as "free information helped me". ) then the effectiveness of "free information on YouTube is:(500,000/17,000,000)*100 = 3%Now let me give you some perspective.In the world of mechanical engineering.. let's say electric AC motors, efficiency numbers are around 95%.

"Beefy" Operating Agreements are generally needed if your entity has non-married partners or if you are using an LLC as a wealth transfer mechanism.

We recommend removing mechanicals until tenant MoveIn.

Car mechanics, HVAC, you get the idea. 

What downpayment or financing mechanism will you use?  

Efficiencies of scale, debt mechanisms, etc., will tell you to operate differently.

If you worked with a quality firm, they should be able to assist you with questions about the mechanics of moving funds around.The bottom line is that if all accounts are held in the name of the LLC and associated with the LLC tax ID, they are interchangeable - kind of like different drawers in the same desk.If the relationship with Stessa is in the name of the IRA owned LLC, you should be fine.