From the Public Ad Campaign (via Gothamist):
When new technologies come out and or become cheap enough to implement, the advertising industry often uses them to create new venues for advertising dissemination. It seems the large scale vinyl print has found its newest application as the economic crisis leaves storefronts abandoned and landlords without income. These locations are treated by the Department of buildings the same way billboards are treated and thus require permits. If permits are not obtained the signage is considered illegal and is subject to the same fines and violations associated will illegal billboards.