I thought it was my fault, hitting some new hotkey key on my keyboard or something, until I saw others were having the issue with the Buy a Retail Store lot map showing up on occasion. It's worst at the library where there are many sims using computers, so that's what I looked at first.
Sure enough, sims can attempt to autonomously buy a retail store lot from the computers, including all those NPCs joyfully browsing porn the MTS website at the library.
Just pop this package into your mods folder and that annoyance is over.
