The way Steve depicted is the best way to do it.

However, using an mca product, what I have seen in the past is have the current owner stay on, and with each round of funding, they give a percentage of ownership to the new owner and/or have some other sort of document (such as a buy-out agreement) depicting how much is left. The problem is that the mca wont get this done in one shot. Typically the sale price is much more than a few rounds of funding so it takes a long time for the current owner to walk away fully paid.