Citigroup Center

This 59-story building—easy to spot in the New York City skyline due to its sloping right-triangle rooftop—is, at 915 feet, one of Manhattan’s ten tallest skyscrapers. Built as headquarters for Citigroup (then Citicorp) in the late 1970s, it was sold to a real estate firm in 2009, which rechristened it as 601 Lexington, though locals still refer to the building by its old name (and naming rights are said to be available, so stay tuned). Ground-level retailers include a Dunkin Donuts and Barnes and Noble, and a spacious public atrium gives folks an amenable spot to enjoy their crullers and paperbacks.