The Grand Central Terminal-adjacent supertall One Vanderbilt officially topped out this week, reaching its full 1,401-foot height. Designed by Kohn Pedersen Fox, the tower is now Midtown’s tallest office building and the fourth-tallest skyscraper in New York City. One Vanderbilt, developed by SL Green, measures 1.7 million square feet and boasts a unique terra cotta facade as well as the fourth-highest observation deck in the city.