This non-profit museum and organization opened in 1996 with exhibits devoted to the architectural, social and business impact of the world's tallest buildings. The museum moved to Battery Park City in early 2004 displaying contemporary architecture featuring a permanent gallery for the exhibit "Skyscraper/City," a gallery for changing exhibitions, and a bookstore. Stainless-steel floors and ceilings reflect exhibition cases resulting in endless vertical illusions. It has sponsored such exhibits as Downtown Manhattan: The Architecture of Business/The Business of Buildings and Building the Empire State.