I dont want to venture into that until I'm tackling my 50+ unit apartment complexes 

Depending on how big you plan to grow these ventures I would put each business into a separate LLC so that each asset is protected from attacks from the other.You can do it yourself, however get educated on how to properly run the corporation after the fact.  

The IRA capital can purchase a house and pay contractors to do work on that house, so long as there is no direct or indirect benefit or transaction between the IRA and a disqualified party (you, lineal family, entities owned by you or lineal family, etc.)The IRA can joint venture or partner with other investors, but should not interact with you or other disqualified parties on funding a deal jointly.

So, I had a bit of trouble finding an end buyer for a certain property . After a month I gave in to a wholesaler wantingTo JV the deal . BeingSkeptical .. I gave it a shot as I had nothing to lose . Well now, he wants...

I suppose it would work, but I would probably just sign a JV (joint-venture) agreement with the other wholesaler.

I’m carrying other notes from other ventures so I’m not interested in doing much of this right now.

Did you just recently register this LLC just to purchase an investment property with or is this an active LLC that brings revenue through another business venture?

We have partners in Texas and buying and selling on terms is great when done properly.If you need help on it we do offer Joint Venture Partnerships all over the country and we have several in Texas. 

For me, "deals" died out as immature REI swamped the market, paying premiums for junk and keeping people like me at bay waiting for more profitable ventures.

In this particular case I would venture to say the Seller has errored with input data.