The new WGBH headquarters in Brighton has a 30x45ft. LED display visible from the eastbound Mass. Pike below. During the day they run a series of digital murals, the one pictured is "Giraffes Don’t Huff", and at night an image of the evening sky. The display is part of a $85M building on Guest St. designed by Polshek Archecture Partners. I really like that they added several smaller LED displays on 2 sides of the building that makes it seem more organically part of the structure.