It is also an effective way of keeping graffiti away. Plus it draws attention to the building or structure as “potential” not as something to be hated. Maybe it will even bring a buyer, a new occupant or additional creative ideas about how to revitalize the building? Anything but the current dilapidated state of abandoned spaces!
Aerial street art via The Cool Hunter - article on why street art is important to society "Some city councils get it, others don’t. Tapping the creative talents of street artists, illustrators and graphic designers is an effective and cool way to make bland public spaces, old buildings, bridges and car parks new again, and to freshen up the concrete jungle."