Yes there is a separate unit with partially separate utilities.

He made it sound like his LLC and his wife were separate parties for the transaction.)

A legal mother/daughter conversion. 2 separate entrances, 2 kitchen, etc. 

Some closing companies state each transaction is separate and therefore must treat them as so which means they setup a separate escrow and file for each closing.

Some of them also have property management arms as well but those are under separate entities

Can you just model each separately?

You could get a balloon insurance policy to cover all your properties without the extra hassle of annual filings, separate bank accounts, separate tax returns, etc.

Finally I add value to properties including fresh paint, new light fixtures, smart locks and even adding a kitchenette of laundry room if the landlord agrees that it will add value to their property to create a "second unit" out of a bedroom suite with a separate entrance. 

We have also had two separate close friends of the family looking to sell the rental properties they owned, so we bought those and I now manage them.

Get one that the 2 units look to be separate homes with their own yards.