525 Lexington Avenue is a student dormitory and former hotel building at 525 Lexington Avenue in Midtown Manhattan, New York City. The 34-story, 387 ft (118 m) building was designed by Arthur Loomis Harmon in a classical style and was developed by James T. Lee, grandfather of First Lady Jacqueline Bouvier Kennedy Onassis. It was constructed between 1922 and 1923 as the Shelton Hotel, an apartment hotel. The Marriott East Side, one of several large hotels developed around Grand Central Terminal as part of Terminal City, became a New York City designated landmark in 2016.