I sell a lot of locations and while it does seem more professional to let the location know first , I don’t do this because believe it or not some people panic because they don’t know if they’ll get good service or if the prices will increase.
I have an agreement with the buyer that I’ll introduce him and tell the contact that he will be their route driver and that he’ll be their contact person from now on but they can still contact me if needed ( if they do contact me , which rarely happens of course I call the buyer because I want everything to go smoothly). After a month or so I’ll visit the location and after talking to the contact and seeing that everything is going good, I’ll let them know that I sold the location but that if they ever have any concerns or needs that they can contact me and I have had this happen and I called the vendor and let them know that the location isn’t happy , because I want the vendor and the location to be happy because I’d like to sell more locations to that vendor I’m the future.