Could you legally begin to rent this unit in December?

Under contract in 48hrs.

I’ve read the legal paperwork regarding what’s done in order to quiet the title on a tax lien property. 

No the land is currently under contract. 

Loophole - A way of avoiding or escaping a cost or legal burden that would otherwise apply by means of an omission or ambiguity in the wording of a contract or law.The law here isn't a loophole.

Some states/cities legally require you to renew leases if they have not violated one of the "for-cause" eviction criteria (destruction of property, late/no payment, violation lease, etc.)

The wholesaler that I went under contract with has taken legal action against the original seller.

Some states also require an annual license fee to own and operate an LLC so that could also cause a potential for increased costs there as well.I would consult with a real estate attorney to see if an LLC makes sense from a legal standpoint and advise your accountant as to your decision so the appropriate tax filings can be made. 

I am not sure if an attorney review will help with this, specific, basic level of knowledge.Just like an attorney likely won't call out, from a legal perspective, that you are investing with a sponsor who is 23 yrs old and been a residential loan underwriter for 8 months before trying to piece together a syndication.  

While it's not common for lenders to enforce this, it's still a risk.Lender Discomfort: Since the loan stays in the seller's name, if the lender becomes aware of the transfer, they may become uncomfortable with the arrangement, potentially complicating the process.Seller Risk: The seller is still legally responsible for the mortgage.