Mailing to a Resident List & Customer List?

A client asked how they could mail to the area around their store using our resident list [or residential list or occupant list] and still communicate to their customers around the store.
There are two methods to accomplish this.

1. If they want to send the same message to customers and prospects, then just overlay the customer list on the resident list and have customer names and that address added to the resident list.
2. If the messages to customers and prospects are different merge purge the customer and resident list by address and create two separate lists. The resident list, without their customers; the second would be a customer only list.

P.S. The further add personalization and increase response the client used our Resident Plus list and added prospect names to the resident list