How to find out if a new employer or company is coming to a city?

[Jasraj Singh]

While investing out-of-state a lot of people recommends me to invest near a city or place where a big company is opening a new branch so I wanted to know how to determine if a new employer or a company is coming to a city or is going to open a new branch in a city? Like I know we can read news or watch google trends but I wanted to know if there are some other ways? Please let me know!