Since you'll be getting a commercial loan, you will most likely be required to put it into some kind of single purpose entity (LLC).
As for the lease with the retail units, @Lizzie Carver pretty much covered everything. The one thing I would add is that the status of your lease with the retail tenants will affect underwriting with your lender. They'd prefer seeing credit tenants leased up for as long as possible. In your situation, the focus would be on getting them on a longer term lease, but again, Lizzie covers that in her comment.
Finding financing for retail is very difficult right now, so if you have a lender willing to lend on it, that's great. I would think it'd especially be difficult with MTM leases. It may be more regionally affected as I'm in the NYC metro area where retail was shut down much longer than other parts of the country.
Another thing to remember, is that a lot of retail was hurt badly by Covid-19. A lot shut down permanently and a lot of people that may have been thinking of opening their first location or additional locations may be opting not to now. As a retail landlord that will affect your ability negotiate the lease. Up until a few months ago, landlords held the power, but since Covid, that has swayed the other direction. I'd do some market research and make sure those aren't going to be sitting vacant if the tenants leave. That could be the real reason the seller is selling. The "I don't want to be a landlord" reason could just be to prevent you from getting spooked and walking away.