My daughter is currently in New York for four days, sightseeing. Her Airbnb apartment has no curtains in the bedroom windows. There is an office block opposite. I’ve said to her that there maybe mirror glazing so that anybody opposite wouldn’t be able to see into the bedroom.
She can’t tell because there is no road/street that she can look at from the ground .
Is it likely that the owners would have put in, mirror glazing.
Mirror glazing works in opposite directions during the day and night. During the day (when it's brighter outside), people outside can't look in but those inside can see out. However at night (when it's brighter inside) people inside can only see themselves reflected in their window but their room looks like an illuminated fishtank to those looking in from outside. So it wouldn't be much use in a bedroom!