Midtown Sizzler 550 Madison Gets the Rockwell Restaurant Treatment Inside Bar Chimera, featuring a neon sculpture by artist Martin Creed Photo: Jason Varney The passageway to the main dining room of Cote 550 Photo: Jason Varney Great architecture evolves—just take 550 Madison Avenue. In 1984, architects Philip Johnson and John Burgee completed the 37-story office tower as the Manhattan headquarters of AT&T. Clad in pink granite, the midtown skyscraper slyly reinterpreted classical forms, with three sections that evoked ancient Greek columns and a pediment interrupted by a circular opening. In time, the building would become an icon of post-modernism, beloved for its witty fenestration, voids, and ground-level arcades, the latter of which were recently enclosed in glass curtain walls, thanks to a building-wide revitalization by the global architecture firm Snøhetta.…