It was important to Mies that the buildings kept a modern style during the development of the campus, and maintained this look for the future. By confining himself to contemporary materials, glass and steel, he was able to craft the expression of modernity. This is especially noted in the S.R. Crown Hall, which is the College of Architecture and the most admired building of the collection. Designed in 1956, Crown Hall is a straightforward expression of construction and materiality. The building has an open plan that does not have the disruption of columns, once again creating “universal space.” The only partitions in the building are free-standing oak partitions that mark different spaces for different activities. With a ceiling height of 18 feet and a massive floor area of 120′ by 220′, the architecture school contains perfect studio spaces that allow creative interaction among users. A timeless artistic expression of steel and glass, Crown Hall is now a National Historic Landmark.