[wolph]

No there are not cameras on every floor of every office building. It might be different for where you live but over here (the Netherlands) you can't needlessly film people. As an employer you cannot film your employees unless they have explicitly signed a contract that includes camera surveillance.

Additionally you are only allowed to use cameras for security purposes if you can make a case that there is no other way to protect yourself. And before you're in view of any camera it must have been stated explicitly, or the cameras must be obvious before you're being filmed.