I saw this poster on my apartment building and was a bit surprised, as Halloween is not a big holiday here. But then again, there is a small shopping mall in our building and undoubtedly some Halloween items will soon be on sale.
To the right of the poster, through the large glass window, you can see the front entrance to the apt. building with two "security guards" at the front desk (as there is very little crime here--where I live anyway--their role is more varied: they assist with recycling, maintainance, problem-solving, etc.).