Do I just add on an addendum or amend the lease itself? 

It appears that the forum rules have been amended, where YT links are no longer allowed.

@Steven Lam, Generally, if both tenants are on the lease and one wants to move out, it might be necessary to amend the lease or draft a new agreement reflecting the change.

This is different from changing the terms of the actual Rental Agreement, which can only be done upon renewal or amendment, and acceptance by all parties.

Now to the point, I am ending up purchasing it under my own name, but have made it clear to everyone involved that I intend to  put it into the LLC after closing.

It is possible I could require an amendment to previous taxes, I don't think so, but it's possible.

Your subsequent offerings should be dramatically less expensive since you worked through the main template on the first deal, which can just be refined and amended for second, third, fourth, etc.

You may wish to confirm that the new 401k provider will handle the ongoing compliance support such as any required 5500 filing (e.g. 5500-EZ for a one-participant plan with assets in excess of $250,000), any required tax reporting (e.g. 1099-r in the event of a distribution or in-plan Roth conversion), mandatory plan updates and amendments, etc.4.

They will tell you what is required to amend those documents.

Hi, well the process will vary state by state, but in Florida, you have what is called "Resignation or Dissociation of Member or Manager" (the one in your state should have similar name) amendment that you snail mail/email to the state authority where you initially filed for your LLC.