The Bjarke Ingels Group proposal was unveiled with great fanfare in late 2014 as a reimagining of the campus on the southern edge of the Mall, stretching from the Freer Gallery of Art at 12th Street to the Hirshhorn Museum and Sculpture Garden at Seventh Street. The splashy concept had been in development for two years, with construction expected to begin this year. Officials estimated it would take 20 to 30 years to complete its multiple phases. The Smithsonian spent $5.5 million on architecture and research fees associated with the project. – Washington Post