The Modulightor Building is a commercial building in the Midtown East neighborhood of Manhattan, New York City, United States. The first four stories, designed by the architect Paul Rudolph and completed in 1993, originally comprised a 19th-century townhouse. The structure was one of the last designed by Rudolph in Manhattan before he died in 1997; unlike his other projects, the Modulightor Building was not particularly well-publicized, receiving little media coverage until the 2000s. The fifth and sixth stories, completed in 2016, were designed by Mark Squeo, an associate of Rudolph's. The building's facade, and the interior of the third- and fourth-story duplex, are New York City designated landmarks.