About a year ago a Judge in Nevada (I think it was Reno but I’m not sure) was shot through his windows as he was looking out. The shooter was a man with a rifle in a building across the street. Apparently the man was upset about some ruling the Judge had made or was about to make.
About the same time a young woman working late at a law firm called me–apparently some person was trying to get in and she was terrified.
My suggestion: keep the curtain or blinds drawn, even during the day. Set things up so you can see out but no one can see in. At night, be sure to close the windows and lock them! If you have a ground-floor office, this is extra-important.