I hope they realize that that sucks the moisture out of the bricks and cement and that the building is ready to having the grouts redone in no time. That's why you don't see plants growing on Dutch houses that much anymore. WAY too expensive.
This is nothing less than a plot by the enviro-industrial complex to hurt the oil companies by eliminating available wall space for petro-chemical spray paints to be applied.
DOWN WITH THE ENVIRO-INDUSTRIAL COMPLEX!!