A Back Bay resident provides some details, and an explanation for the warning signs somebody's posted along Marlborough Street:
Late night several weeks ago a man tried to break into my apartment by climbing through my window while I was home. I had just walked home from a bar on Boylston Street, and it was about 2 A.M. I heard him trying to remove the air conditioning unit from my window (I'm on the first floor, facing Marlborough Street). Luckily my neighbor came home at that exact time because he was walking his dog, and chased him away. Cops came, and determined that since he attempted to break in minutes after I arrived home and knew I was there, he may very well have followed me home at some point along my journey from Boylston. Hours later, my neighbor was smoking a cigarette outside and he saw a white pickup truck roll slowly down the street and park in front of our building, right in front of my window. When the driver's side window rolled down, it was the same guy. Again, my neighbor chased him away.
This past Friday the same man in the same pickup was seen parked outside my window at 4 A.M. Detectives inside and outside of MA are on this, fortunately, but this person is still out there. What we do know is that he drives a white Ford pickup, license plate 747 WEZ, and while we're not sure what state it is it's definitely not an MA plate. The guy in question is white, in his 40s, brown hair and wore Oakley sunglasses and a hat.