After more than a century in the shadows, NYC’s most famous triangle is finally getting its glow-up For more than a century, the Flatiron Building has been one of New York’s most photographed landmarks, without ever putting on a proper nighttime show. That’s about to change. When the 307-foot Beaux-Arts beauty unveils its restored exterior later this year, it will debut something it’s never had in its 123-year history: exterior lighting. Thanks to a newly approved plan by design studio L’Observatoire International, the wedge-shaped wonder at Fifth Avenue, Broadway and 23rd Street will finally shine like its fellow skyline icons.