The 3,900-square-foot, two-floor duplex is housed in a 1907 Italian Renaissance style building originally designed by Charles A. Platt. It boasts almost 20-foot ceilings in the living room with a towering leaded glass window, numerous fireplaces, and 600 linear feet of bookshelves. Massimo and Lella Vignelli bought the three-bedroom, three-and-half-bath home in 1978 and lived there until they passed, he in 2012 and she in 2016. It's now on the market for $6,500,000 and serves as a testament to the couple's influential design practice.

The Italian-born couple, both trained in architecture, moved to New York in 1965. They set up Vignelli Associates and practiced in a range of disciplines over the ensuing decades, including architecture, graphic design, product design, corporate brand identity, and interior design. Noteworthy commissions include Bloomingdale's (the big brown bag and logo), the Stendig calendar, and a 1972 map of the New York Subway. According to the documentary titled Design is One, the couple's motto was, "If you can't find it, design it."

Gabriele Devlin and Lee Summers of Sotheby's International Realty hold the listing.

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