The Museum of the City of New York is a history and art museum on Fifth Avenue's Museum Mile in Manhattan, dedicated to preserving and presenting the story of New York City and its residents. Founded in 1923 by Henry Collins Brown, it originally occupied Gracie Mansion before moving to its current neo-Georgian building, designed by Joseph H. Freedlander and completed in 1932, later designated a New York City landmark in 1967. A 2006-2008 expansion added a glass pavilion designed by the Polshek Partnership. The museum's collection exceeds 1.5 million items, particularly strong in nineteenth- and early twentieth-century holdings, including paintings, photographs, decorative arts, costumes, toys, Broadway memorabilia, and historical documents chronicling the city's development.