Suspicious guy sits outside my workplace for hours at a time, changes cars and seems to be taking notes?

If he drove a late model Bimmer, he could be a real estate investor checking out nearby properties to develop or buy. Getting the volume of traffic a property's location generates is one factor investors look at if they decide in pursuing a project.. If he had a run down BMW, more than 10 yrs old. I would be suspicious. The next time around call the police.