550 Madison Ave. is getting a retro makeover

550 Madison Ave. is getting a retro makeover
What’s old is (almost) new again at 550 Madison Avenue, the “Chippendale”-top tower that’s been a preservationist flashpoint since it was sold two years ago. A long-awaited redesign by architects Snóhetta, unveiled on Tuesday, is meant to evoke the landmarked, former AT&T headquarters’ original 1984 look — and eliminate or improve on changes that were...